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Cosmetology (Kenya TVET CDACC Beauty & Cosmetology) practice questions

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Question 1Scientific Concepts and Hair Care

Which layer of the hair shaft contains melanin granules that determine natural color?

  1. The medulla
  2. The cortex Correct answer.
  3. The inner root sheath
  4. The cuticle

Explanation

The cortex is the thick middle layer of the hair shaft and holds the melanin pigment that gives hair its natural color, along with the disulfide bonds that give strength and elasticity. The cuticle is the outer protective layer and the medulla is the innermost core, which may be absent in fine hair.

Question 2Scientific Concepts and Hair Care

A client's hair has a pH of about 4.5. What does this value indicate about the hair and scalp?

  1. They are slightly acidic, which helps keep the cuticle compact Correct answer.
  2. They are neutral, so no chemical change occurs
  3. They are strongly alkaline, which swells the cuticle
  4. They are strongly acidic, which permanently damages the cortex

Explanation

Hair and scalp normally sit on the acid side of neutral, near pH 4.5 to 5.5, and this mild acidity helps the cuticle scales lie flat and resist swelling. Products formulated near this pH support shine and manageability rather than raising the cuticle.

Question 3Scientific Concepts and Hair Care

Which bond in the hair is broken by a chemical hair relaxer and then reformed in its new shape?

  1. The hydrogen bond
  2. The peptide bond
  3. The disulfide bond Correct answer.
  4. The salt bond

Explanation

Relaxers use a strong alkaline agent to break disulfide bonds, which are the strong cross-links between cysteine amino acids in the cortex. After the hair is smoothed, a neutralizer or fixative rebuilds those disulfide bonds in the new configuration.

Question 4Scientific Concepts and Hair Care

During the anagen phase of the hair growth cycle, what is happening in the follicle?

  1. The follicle is in its shortest phase, lasting only weeks
  2. The follicle is resting and the hair is shed
  3. New cells are dividing and the hair is actively growing Correct answer.
  4. The hair is separating from the dermal papilla

Explanation

Anagen is the active growth phase, when cells in the matrix divide rapidly and push the hair upward, and it lasts the longest of the three phases. Catagen is the transitional phase and telogen is the resting phase that ends in shedding.

Question 5Scientific Concepts and Hair Care

A client with a dry, flaky scalp asks which shampoo type best suits the condition. Which recommendation fits a dry scalp?

  1. A clarifying shampoo used daily
  2. A medicated shampoo for oily scalp
  3. A moisturizing shampoo with a low-detergent, conditioning formula Correct answer.
  4. A high-alkaline shampoo for deep cleansing

Explanation

Dry scalp benefits from gentle, low-detergent cleansers that add moisture and avoid stripping natural oils. Clarifying and high-alkaline products remove oil aggressively and would worsen dryness.

Question 6Scientific Concepts and Hair Care

Which ingredient in a conditioner primarily smooths the cuticle and reduces static by coating the hair surface?

  1. Cationic conditioning agents Correct answer.
  2. Ammonium thioglycolate
  3. Hydrogen peroxide
  4. Sodium lauryl sulfate

Explanation

Cationic conditioning agents carry a positive charge that binds to negatively charged hair, coating the cuticle and reducing friction and static. Sodium lauryl sulfate is a detergent, hydrogen peroxide is an oxidizer, and ammonium thioglycolate is a waving agent.

Question 7Scientific Concepts and Hair Care

A client with very porous, over-processed hair wants a permanent color service. Which approach best protects the hair?

  1. Use a high-volume developer to shorten processing time
  2. Skip the strand test to save time
  3. Perform a patch test and strand test, then use a gentle formula and low-volume developer Correct answer.
  4. Apply the strongest lightener available to ensure lift

Explanation

Porous, over-processed hair absorbs and releases color quickly, so a patch test and strand test help predict the result and avoid further damage. A gentle formula with lower-volume developer reduces additional stress on the cuticle.

Question 8Scientific Concepts and Hair Care

What is the primary function of the arrector pili muscle attached to a hair follicle?

  1. It produces sebum for the scalp
  2. It supplies blood to the dermal papilla
  3. It contracts to make the hair stand up and causes goose bumps Correct answer.
  4. It generates new hair cells during anagen

Explanation

The arrector pili is a small smooth muscle that contracts in response to cold or emotion, pulling the follicle upright and creating goose bumps. Sebum comes from the sebaceous gland, and cell division occurs in the matrix above the papilla.

Question 9Scientific Concepts and Hair Care

Which term describes hair with a naturally flattened, ribbon-like shaft that tends to curl tightly?

  1. Curly hair Correct answer.
  2. Straight hair
  3. Wavy hair
  4. Extremely straight hair

Explanation

Curly hair has an elliptical or flattened cross-section, which causes the shaft to bend and coil. Straight hair has a round cross-section, and wavy hair falls between the two shapes.

Question 10Scientific Concepts and Hair Care

A stylist is choosing a comb for detangling wet, fragile hair. Which choice best minimizes breakage?

  1. A wide-tooth comb with smooth, seamless teeth Correct answer.
  2. A metal pick with exposed tines
  3. A stiff bristle brush used on soaking wet hair
  4. A fine-tooth comb with sharp seams

Explanation

Wet hair is weaker because water breaks hydrogen bonds and swells the shaft, so a wide-tooth comb with smooth teeth detangles with less tension. Fine teeth, sharp seams, and stiff bristles concentrate stress and invite breakage.

Question 11Scientific Concepts and Hair Care

Which factor most directly determines the amount of lift achieved when lightening natural hair?

  1. The temperature of the rinse water
  2. The natural pigment level and the developer volume used Correct answer.
  3. The type of comb used
  4. The client's hair length

Explanation

Lift depends on the starting pigment level of the hair and the strength of the developer, which controls how much oxygen is released. Hair length, comb type, and rinse temperature do not set the degree of lift.

Question 12Scientific Concepts and Hair Care

What does the term elasticity describe when evaluating hair for a chemical service?

  1. The thickness of the individual strand
  2. The ability of hair to absorb water
  3. The ability of hair to stretch and return to its original length Correct answer.
  4. The color of the hair shaft

Explanation

Elasticity is tested by stretching a wet strand and seeing whether it springs back, which reflects the condition of the cortex and its bonds. Hair with poor elasticity breaks easily and may not tolerate chemical processing.

Question 13Scientific Concepts and Hair Care

In a pH scale, what happens to the cuticle when hair is exposed to a strongly alkaline solution such as a relaxer?

  1. The cuticle becomes more acidic and repels the product
  2. The cuticle dissolves completely and regrows
  3. The cuticle hardens and seals shut
  4. The cuticle swells and lifts, allowing the solution to penetrate the cortex Correct answer.

Explanation

Alkaline solutions raise pH, causing the cuticle scales to swell and lift so the active chemicals can reach the cortex. This is why relaxers and alkaline colors work but also why they require careful timing and neutralizing.

Question 14Scientific Concepts and Hair Care

Which characteristic best describes hair with high porosity?

  1. The hair has a round cross-section and is very straight
  2. The cuticle lies flat and resists moisture
  3. The cuticle is raised, so hair absorbs moisture quickly but loses it quickly Correct answer.
  4. The hair grows faster than average

Explanation

High porosity means the cuticle layer is open or damaged, so moisture enters quickly but also escapes quickly, leaving hair prone to frizz and dryness. Low porosity is the opposite, with a tight cuticle that resists moisture.

Question 15Scientific Concepts and Hair Care

A client reports that her scalp flakes and itches after using a harsh clarifying shampoo daily. Which adjustment best addresses the problem?

  1. Increase clarifying use to twice daily
  2. Stop shampooing entirely
  3. Switch to a gentler shampoo and reduce clarifying use to once a week or less Correct answer.
  4. Add a strong alkaline treatment

Explanation

Daily clarifying shampoo can strip oils and irritate the scalp, so reducing frequency and choosing a gentler formula restores comfort. Increasing use or adding alkaline treatments would aggravate the irritation.

Question 16Scientific Concepts and Hair Care

Which statement correctly describes the relationship between hair density and hair texture?

  1. Density and texture are the same measurement
  2. Density refers to curl pattern, while texture refers to color
  3. Density is the number of hairs per square inch, while texture is the diameter of each strand Correct answer.
  4. Density is the diameter of each strand, while texture is the number per square inch

Explanation

Density counts how many hairs grow in a given area, while texture describes the thickness or diameter of each individual strand. A client can have high density with fine texture or low density with coarse texture.

Question 17Scientific Concepts and Hair Care

Which product would best remove heavy product buildup and mineral deposits before a chemical service?

  1. A color-enhancing shampoo
  2. A moisturizing conditioner
  3. A leave-in serum
  4. A clarifying shampoo Correct answer.

Explanation

Clarifying shampoo lifts residue and mineral deposits so chemicals can penetrate evenly. Conditioners, serums, and color-enhancing shampoos add or deposit ingredients rather than remove buildup.

Question 18Scientific Concepts and Hair Care

What is the role of the neutralizer in a permanent wave service?

  1. It coats the hair with silicone for shine
  2. It breaks disulfide bonds to soften the hair
  3. It lightens the hair's natural pigment
  4. It rebuilds disulfide bonds in the new curl shape and lowers the hair's pH Correct answer.

Explanation

The waving lotion reduces disulfide bonds and reshapes them around the rod, then the neutralizer oxidizes those bonds into the new position and restores the hair's normal pH. Without neutralizing, the wave would relax and the hair would remain fragile.

Question 19Scientific Concepts and Hair Care

A client with fine, limp hair wants more volume. Which combination best supports that goal?

  1. A silicone serum applied to the scalp
  2. A heavy moisturizing conditioner applied to the roots
  3. A high-alkaline relaxer
  4. A lightweight volumizing shampoo paired with a root-lifting styling product Correct answer.

Explanation

Fine hair is easily weighed down, so lightweight volumizing cleansers and root-lifting products add body without coating the scalp. Heavy conditioners, relaxers, and scalp serums flatten the hair and reduce lift.

Question 20Scientific Concepts and Hair Care

Which statement best explains why a strand test is important before a color service on gray hair?

  1. Gray hair lacks melanin and often resists color, so the test shows the actual result and timing Correct answer.
  2. Gray hair has no cuticle and absorbs color instantly
  3. Gray hair always lightens faster than pigmented hair
  4. Gray hair cannot be colored at all

Explanation

Gray hair has little or no melanin and a denser cuticle, so it often resists pigment and may need a different formula or longer processing. A strand test reveals how the specific hair will take the color before the full service.

Question 21Scientific Concepts and Hair Care

Which property of the hair shaft makes it possible to temporarily straighten hair with a blow dryer and brush?

  1. Salt bonds are unaffected by moisture
  2. Hydrogen bonds can be rearranged by water and heat and then reset on cooling Correct answer.
  3. Peptide bonds melt at low temperatures
  4. Disulfide bonds are permanently broken by heat alone

Explanation

Water breaks hydrogen bonds and heat plus tension lets the hair dry into a new shape; when the hair cools, new hydrogen bonds set the style. This change is temporary because moisture can rearrange the bonds again.

Question 22Scientific Concepts and Hair Care

A client's hair shows breakage near the scalp and uneven color after a previous lightening service. Which analysis best explains the uneven result?

  1. The developer was too weak to lift any pigment
  2. Heat from the scalp accelerated the lightener near the roots, causing over-processing Correct answer.
  3. The client's hair had no cuticle
  4. The hair was too short for the lightener to work

Explanation

Scalp heat speeds up the lightening reaction near the roots, so that area can process faster than mid-lengths and ends. This uneven rate causes over-processing and patchy color unless application and timing are adjusted.

Question 23Scientific Concepts and Hair Care

Which ingredient would you expect in a product designed to close the cuticle after an alkaline service?

  1. An acid-balanced conditioning agent Correct answer.
  2. Ammonium thioglycolate
  3. Sodium hydroxide
  4. A strong alkaline builder

Explanation

Acid-balanced conditioners lower the hair's pH and help the cuticle scales lie flat after an alkaline service, improving shine and reducing friction. Alkaline builders, sodium hydroxide, and thioglycolate all open or chemically alter the cuticle.

Question 24Scientific Concepts and Hair Care

What is the primary reason a patch test is performed before applying a permanent hair color?

  1. To determine the hair's porosity
  2. To decide the rod size for a perm
  3. To measure the hair's elasticity
  4. To check for an allergic reaction to the dye before full application Correct answer.

Explanation

A patch test applies a small amount of product to the skin to detect an allergic sensitivity before the full service. Elasticity, porosity, and rod size are assessed by other tests during the consultation.

Question 25Scientific Concepts and Hair Care

Which statement best describes the effect of a low-pH (acidic) shampoo on the hair shaft?

  1. It swells the cuticle and opens the cortex
  2. It removes all natural oils from the scalp
  3. It helps the cuticle lie flat and reduces swelling of the shaft Correct answer.
  4. It permanently breaks disulfide bonds

Explanation

Acidic shampoos keep the hair near its natural pH, so the cuticle stays compact and the shaft swells less during washing. This supports smoothness and shine without the permanent bond changes caused by relaxers.

Question 26Scientific Concepts and Hair Care

Which layer of the hair shaft is responsible for the hair's strength and elasticity?

  1. The inner root sheath
  2. The cortex Correct answer.
  3. The medulla
  4. The cuticle

Explanation

The cortex is the thick middle layer made of elongated keratinized cells held together by disulfide, hydrogen, and salt bonds. Those bonds give hair its tensile strength and its ability to stretch and return. The cuticle is a protective outer covering, and the medulla is a soft central core that may be absent in fine hair.

Question 27Scientific Concepts and Hair Care

Which phase of the hair growth cycle is the active growing stage during which new cells are produced in the follicle?

  1. Catagen
  2. Anagen Correct answer.
  3. Exogen
  4. Telogen

Explanation

Anagen is the growth phase, when cells in the hair bulb divide rapidly and push the shaft upward. It lasts from roughly two to six years and determines how long a hair can grow. Catagen is a brief transition, and telogen is the resting phase before shedding.

Question 28Scientific Concepts and Hair Care

Which type of hair bond is broken by water and heat and re-forms as the hair dries or cools, allowing temporary styling changes?

  1. Salt bond
  2. Peptide bond
  3. Hydrogen bond Correct answer.
  4. Disulfide bond

Explanation

Hydrogen bonds form between adjacent protein chains and are easily broken by water and heat, then re-form in a new position as the hair dries or cools. This is why wet setting and blow-drying can reshape hair temporarily. Disulfide bonds require chemical reducing agents to change.

Question 29Scientific Concepts and Hair Care

What does the term medulla describe in a strand of terminal hair?

  1. The central core of the hair shaft Correct answer.
  2. The outermost protective scale layer
  3. The pigment-producing cells of the bulb
  4. The sebaceous gland attached to the follicle

Explanation

The medulla is the innermost core of the hair shaft, made of soft, loosely arranged cells. It may be continuous, fragmented, or absent, especially in fine hair. It is not the outer layer, the pigment cells, or a gland.

Question 30Scientific Concepts and Hair Care

Which term describes the natural wave pattern of hair as classified on a scale from straight to tightly coiled?

  1. Texture Correct answer.
  2. Density
  3. Elasticity
  4. Porosity

Explanation

Texture in this context refers to the degree of curl or wave pattern of the hair, often described on a numbered scale. Density is how many hairs grow per square inch, porosity is the ability to absorb moisture, and elasticity is the ability to stretch and return.

Question 31Scientific Concepts and Hair Care

Which structure supplies blood and nutrients to the cells of the hair bulb?

  1. The dermal papilla Correct answer.
  2. The arrector pili
  3. The hair shaft
  4. The sebaceous gland

Explanation

The dermal papilla is a small cone of connective tissue at the base of the follicle containing blood vessels that nourish the dividing cells of the bulb. Without this blood supply, growth slows or stops. The sebaceous gland lubricates the hair, and the arrector pili is a small muscle.

Question 32Scientific Concepts and Hair Care

Which term describes the measure of how much a hair strand can stretch and then return to its original length?

  1. Porosity
  2. Density
  3. Texture
  4. Elasticity Correct answer.

Explanation

Elasticity is the hair's ability to stretch when wet and return to its original length without breaking. Healthy hair can stretch roughly half again its length and rebound. Low elasticity signals weak bonds and warns against aggressive chemical services.

Question 33Scientific Concepts and Hair Care

What is the main purpose of the cuticle layer on a hair strand?

  1. To produce melanin pigment
  2. To anchor the hair to the scalp
  3. To protect the inner cortex from damage Correct answer.
  4. To generate new hair cells

Explanation

The cuticle is the outer layer of overlapping scales that shields the softer cortex beneath from friction, chemicals, and moisture loss. When the cuticle is intact, hair looks smooth and reflects light. It does not produce pigment or new cells.

Question 34Scientific Concepts and Hair Care

A client has coarse, resistant hair with a tight cuticle and wants a permanent wave. Which adjustment is most appropriate for this hair type?

  1. Apply the neutralizer before the waving solution
  2. Skip the pre-wrap test and process at room temperature only
  3. Use a milder wrapping solution and shorten processing time
  4. Use a stronger solution and allow a longer processing time Correct answer.

Explanation

Resistant hair has a tightly packed cuticle that slows the penetration of chemicals, so a stronger waving solution and longer processing are typically needed to achieve a lasting curl. Coarse hair can usually tolerate this without excessive damage. Milder solution is better suited to porous or damaged hair.

Question 35Scientific Concepts and Hair Care

A client with oily scalp and dry ends asks for shampoo advice. Which approach best addresses both concerns?

  1. Wash only once a week with cool water and no conditioner
  2. Use a strong clarifying shampoo on the entire length daily
  3. Apply conditioner to the scalp and skip shampooing the ends
  4. Shampoo the scalp area and condition the mid-lengths and ends Correct answer.

Explanation

Sebum is produced at the scalp, so cleansing there removes oil, while the drier mid-lengths and ends benefit from conditioning rather than frequent shampooing. This balances oil control with moisture retention. Harsh daily clarifying shampoo over the whole length strips the ends further.

Question 36Scientific Concepts and Hair Care

Which statement correctly explains the role of disulfide bonds in permanent hair color?

  1. They are the bonds that give the hair its natural color
  2. They are not affected by color products and remain intact Correct answer.
  3. They must be broken for color to deposit permanently
  4. They are broken by the developer to allow lightening

Explanation

Disulfide bonds are structural cross-links in the cortex and are not broken by oxidative hair color, which works by opening the cuticle and altering melanin. Permanent color fades gradually but does not depend on cleaving disulfide bonds. Only relaxers and permanent waves deliberately break them.

Question 37Scientific Concepts and Hair Care

A client wants to lighten dark hair several levels. Which product should be selected to achieve the lift?

  1. A permanent color mixed with a higher-volume developer Correct answer.
  2. A color-enhancing shampoo
  3. A deposit-only semipermanent color
  4. A temporary color rinse

Explanation

Achieving several levels of lift requires an oxidative product that can remove natural pigment, which means permanent color combined with a higher-volume developer. Semipermanent and temporary products deposit color but cannot lighten natural melanin. A color-enhancing shampoo only adds tone.

Question 38Scientific Concepts and Hair Care

Which statement best describes how a relaxer changes curly hair to straight?

  1. It coats the shaft with a heavy film that weighs the curl down
  2. It removes melanin so the hair loses its wave memory
  3. It breaks disulfide bonds and re-forms them in a straight configuration Correct answer.
  4. It seals the cuticle so the curl cannot re-form

Explanation

A chemical relaxer uses a strong alkaline or reducing agent to break disulfide bonds in the cortex, and the hair is then smoothed so the bonds re-form in a straighter shape. This is a structural change, not a coating or pigment effect. Neutralizing or acid-balancing afterward stabilizes the new bonds.

Question 39Scientific Concepts and Hair Care

A client's hair feels mushy and stretches too far when wet. Which conclusion is most accurate?

  1. The hair has high density and needs thinning
  2. The hair has good elasticity and is ready for a strong relaxer
  3. The hair has low elasticity and is at risk of breaking during chemical services Correct answer.
  4. The hair has low porosity and will resist chemical penetration

Explanation

Hair that stretches excessively and feels mushy when wet has poor elasticity, meaning the bonds are weakened and the cortex is compromised. Such hair is prone to breakage and should be treated gently, with strengthening and conditioning before any chemical service. Good elasticity means the hair stretches and rebounds without sagging.

Question 40Scientific Concepts and Hair Care

Which ingredient is commonly included in a dandruff shampoo to help control flaking caused by Malassezia?

  1. Dimethicone
  2. Sodium lauryl sulfate
  3. Citric acid
  4. Zinc pyrithione Correct answer.

Explanation

Zinc pyrithione is an antifungal agent used in medicated shampoos to reduce the Malassezia yeast associated with dandruff and seborrheic flaking. Sodium lauryl sulfate is a surfactant, citric acid adjusts pH, and dimethicone conditions. Only the antifungal directly targets the cause of the flaking.

Question 41Scientific Concepts and Hair Care

A client with a history of allergic reactions wants a permanent color service. Which step is most important before proceeding?

  1. Skip the developer to reduce irritation
  2. Apply the color to a small area and wait one hour
  3. Perform a patch test at least 24 to 48 hours in advance Correct answer.
  4. Test the color on a paper towel to check the shade

Explanation

A patch test applies a small amount of the color product to the skin and is read after 24 to 48 hours to detect an allergic reaction before a full application. This is the standard safety precaution for clients with a history of reactions. Testing on a paper towel checks color, not sensitivity.

Question 42Scientific Concepts and Hair Care

Which statement best explains why hair appears lighter after oxidation during lightening?

  1. The cuticle is removed, exposing a pale inner layer
  2. The cortex swells and reflects more light
  3. The hair absorbs developer and turns lighter
  4. Melanin pigment is oxidized and broken down into lighter compounds Correct answer.

Explanation

Lighteners and high-lift colors use an oxidizing agent to break down melanin granules into lighter-colored compounds, so the hair reflects more light and appears lighter. The pigment is chemically altered, not physically removed with the cuticle. This process also weakens the hair, which is why strand testing matters.

Question 43Scientific Concepts and Hair Care

A client wants to know why hair becomes drier after repeated bleaching. Which explanation is most accurate?

  1. Bleach adds pigment that absorbs moisture
  2. Bleach raises and damages the cuticle, increasing porosity and moisture loss Correct answer.
  3. Bleach lowers the pH of the hair permanently
  4. Bleach increases the hair's natural oil production

Explanation

Bleaching lifts the cuticle scales and damages the cortex, raising porosity so moisture escapes more easily and the hair feels dry and rough. Over-processing compounds this effect. The solution is gentler treatment and conditioning, not more bleaching.

Question 44Scientific Concepts and Hair Care

Which term describes the direction in which the hair grows from the scalp and affects how it lies?

  1. Hair elasticity
  2. Hair stream Correct answer.
  3. Hair density
  4. Hair porosity

Explanation

Hair stream refers to the direction of hair growth from the follicle, which determines how the hair falls and where natural partings or whorls occur. Density, porosity, and elasticity describe quantity, moisture behavior, and stretch, not growth direction.

Question 45Scientific Concepts and Hair Care

A client with fine hair wants a style with more body. Which recommendation best supports that goal?

  1. Use a lightweight volumizing mousse at the roots and blow-dry with lift Correct answer.
  2. Use a deep conditioning mask daily on the scalp
  3. Apply a heavy leave-in cream from scalp to ends
  4. Coat the hair with a silicone serum before styling

Explanation

Fine hair is easily weighed down, so a lightweight volumizing product applied at the roots plus blow-drying with lift adds body without heaviness. Heavy creams and silicone serums coat and flatten fine strands. Daily scalp masks add weight and oiliness.

Question 46Scientific Concepts and Hair Care

Which statement best describes how the pH of a permanent wave solution affects the hair?

  1. pH has no effect on the waving process
  2. Acidic solutions permanently break disulfide bonds
  3. Alkaline solutions swell the cuticle and allow the reducing agent to enter the cortex Correct answer.
  4. Neutral solutions cannot penetrate the cuticle at all

Explanation

Alkaline waving solutions raise the pH, causing the cuticle to swell and open so the reducing agent can reach the cortex and break disulfide bonds. After processing, the neutralizer restores the bonds and returns the hair toward its normal pH. Acidic and neutral solutions act more slowly and are not the main mechanism described here.

Question 47Scientific Concepts and Hair Care

A client has a dry, flaky scalp with redness along the hairline. Which action is most appropriate for a stylist?

  1. Scrub the scalp vigorously with a fine-tooth comb
  2. Apply a strong relaxer to remove the flakes
  3. Apply essential oils directly to the inflamed area
  4. Recommend a medicated shampoo and suggest the client see a dermatologist if it persists Correct answer.

Explanation

Persistent redness and flaking may indicate a scalp disorder beyond routine dandruff, so a medicated shampoo can help mild cases while a dermatologist should evaluate persistent or inflamed conditions. Stylists do not diagnose or treat medical conditions. Vigorous scrubbing and strong chemicals can worsen irritation.

Question 48Scientific Concepts and Hair Care

A client with high-porosity, previously lightened hair wants a demi-permanent color for shine. Which approach best minimizes further damage?

  1. Apply a high-lift bleach to open the cuticle first
  2. Apply the color with a high-volume developer to ensure penetration
  3. Apply a low-ammonia, deposit-only demi-permanent color and avoid additional lightening Correct answer.
  4. Use a strong relaxer before coloring

Explanation

High-porosity, lightened hair already has an open cuticle and weakened cortex, so a gentle deposit-only demi-permanent color adds tone and shine without further lifting. High-volume developer or bleach would compound damage. The goal is to avoid additional oxidative stress.

Question 49Scientific Concepts and Hair Care

Which explanation best describes why hair with a compact, tightly layered cuticle resists chemical penetration?

  1. The cortex has more melanin, which blocks chemicals
  2. The cuticle scales are tightly closed, slowing the entry of solutions into the cortex Correct answer.
  3. The medulla is absent, so solutions have nowhere to go
  4. The hair has low density, reducing surface area

Explanation

A tightly closed, compact cuticle provides a strong barrier that slows the penetration of water, color, and waving solutions, which is why resistant hair often needs stronger solutions or longer processing. Melanin, medulla presence, and density do not control chemical penetration in this way.

Question 50Scientific Concepts and Hair Care

A client's hair was relaxed two weeks ago and now shows breakage at the mid-shaft with a slight wave returning. Which analysis is most likely?

  1. The relaxer was under-processed and the hair is reverting
  2. The neutralizer was applied too thoroughly
  3. The hair was over-processed, leaving weakened bonds and breakage Correct answer.
  4. The client used a sulfate-free shampoo

Explanation

Breakage combined with a slight return of wave suggests the hair was over-processed: disulfide bonds were broken excessively, weakening the cortex so the hair breaks and loses its straight set. Under-processing would leave more curl but not typically mid-shaft breakage. Proper neutralization and gentle cleansing support the result rather than cause damage.