Skin of rabbit is

Correct Answer: A

Rationale: The correct answer is A because the skin of a rabbit is typically dry, thin, soft, and hairy. Rabbits have delicate skin with a thin layer of fur, making it soft to the touch. The hair on the skin provides insulation and protection. Choice B is incorrect because rabbit skin is not typically hairless. Choices C and D are incorrect as rabbit skin is not thick or hard; it is known for its thin and delicate nature.

Correct Answer: A

Rationale: The correct answer is A: Perineal glands. The perineal glands, also known as apocrine glands, are responsible for producing pheromones that can stimulate sex libido in humans. These glands are located in the genital area and produce a specific scent that can attract potential mates. Sebaceous glands (choice B) are responsible for producing oil to lubricate the skin and hair, but not directly related to sex libido. Sweat glands (choice C) regulate body temperature by producing sweat, but do not play a direct role in provoking sex libido. Choice D is incorrect because not all of the above glands mentioned are related to sex libido; only the perineal glands are directly linked to stimulating sex drive.

Correct Answer: A

Rationale: The correct answer is A: Skin. Vitamin D is synthesized in the skin when it is exposed to sunlight. UV rays convert a form of cholesterol in the skin into Vitamin D. The liver and kidney play roles in converting and activating Vitamin D, but they are not where Vitamin D is initially synthesized. The stomach is not involved in the synthesis of Vitamin D. So, the skin is the correct choice for the synthesis of Vitamin D in the presence of sunlight.

Correct Answer: C

Rationale: The correct answer is C: Conjunctiva. The conjunctiva is a thin, transparent mucous membrane that covers the front surface of the eye and lines the inside of the eyelids. It is the thinnest epidermis as it is only one cell thick, allowing for transparency and protection of the eye. The face, nipples, and lips have thicker epidermis layers compared to the conjunctiva, making them incorrect choices. Thus, the conjunctiva is the correct answer due to its unique thin structure and location.

Correct Answer: D

Rationale: Keratin found in rabbit skin is classified as a scleroprotein, which is a type of structural protein. Keratin is known for its tough and fibrous nature, providing strength and protection to the skin. Scleroproteins are characterized by their high tensile strength and are commonly found in structural tissues like skin, hair, and nails. Lipoproteins consist of lipids and proteins, glycoproteins have carbohydrate groups attached to the protein, and mucoproteins contain mucopolysaccharides. These types of proteins do not accurately describe the composition and function of keratin in rabbit skin.