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Which of the following is not involved in chemical digestion?

A.

Oral cavity

B.

Stomach

C.

Small intestine

D.

Large intestine

Answer and Explanation

The Correct Answer is D

A. Oral cavity is involved in chemical digestion through the action of salivary enzymes like amylase. 

 

B. Stomach is involved in chemical digestion with gastric acids and pepsin.

 

C. Small intestine is a major site for chemical digestion and nutrient absorption. 

 

D. Large intestine is primarily involved in the absorption of water and electrolytes and the formation of feces. It is less involved in chemical digestion compared to the other organs listed. 
 


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Correct Answer is C

Explanation

A. While in a secondary follicle: The ovum completes meiosis only after fertilization, not while in a secondary follicle.

B. While in a primary follicle: The ovum is arrested in prophase I of meiosis while in a primary follicle. Meiosis is not completed until fertilization.

C. During fertilization: The ovum completes meiosis II during fertilization, which is when the second meiotic division is completed.

D. During implantation: Meiosis is not completed during implantation. It is completed at fertilization.

Correct Answer is C

Explanation

A. Lactose; lactase: Lactase is the enzyme that breaks down lactose, not the other way around.

B. Lipases; micelles: Lipases break down lipids (fats) into fatty acids and glycerol, not micelles. Micelles are formed as part of the digestion process but are not the substrate for lipases.

C. Peptidases; proteins: Peptidases (or proteases) break down proteins into smaller peptides and amino acids. This is the correct answer.

D. Lactase; glucose: Lactase breaks down lactose into glucose and galactose, not just glucose.