Melanocytes or melanophores are placed at places in between-

Correct Answer: A

Rationale: The correct answer is A because melanocytes are located in the basal layer of the epidermis (stratum germinativum), where they produce melanin. Melanin then transfers to neighboring keratinocytes to protect the skin from UV radiation. Choices B, C, and D are incorrect because melanocytes are not found in the stratum lucidum, subcutaneous layer, or stratum granulosum. The stratum lucidum is a translucent layer without melanocytes, the subcutaneous layer contains adipose tissue but not melanocytes, and the stratum granulosum is the layer above the stratum germinativum where keratinocytes undergo changes in morphology.

Correct Answer: C

Rationale: The correct answer is C: Tears. Lacrimal glands are responsible for producing tears, which help keep the eyes moist and protect them from irritants. Tears contain water, electrolytes, proteins, and enzymes. Sebum (A) is produced by sebaceous glands to lubricate the skin and hair. Cerumin (B) is produced by ceruminous glands in the ear canal to protect the ear from debris. Mucous (D) is produced by mucous membranes to protect and lubricate various tissues in the body. Therefore, the correct answer is tears as lacrimal glands specifically produce this fluid to maintain eye health.

Correct Answer: C

Rationale: The correct answer is C: Sebaceous glands. Glands of Zeis are modified sebaceous glands that are associated with the eyelashes. Sebaceous glands produce sebum, an oily substance that helps keep the skin and hair lubricated and waterproof. In contrast, sweat glands (choice A) produce sweat, mucous glands (choice B) secrete mucus, and sudoriferous glands (choice D) are another term for sweat glands. Therefore, choice C is correct as it accurately reflects the function of the glands of Zeis.

Correct Answer: B

Rationale: The correct answer is B: Cold climate. Bears have thick hairy skin to provide insulation and warmth in cold climates. This helps them regulate body temperature and survive in harsh winter conditions. Option A is incorrect because thick hairy skin is not specifically for protection from danger. Option C is incorrect as hot climates typically require thinner fur for heat dissipation. Option D is incorrect because bears do not live in hot climates, so it's not applicable to all conditions.

Correct Answer: A

Rationale: The correct answer is A because "goose-flesh" or goosebumps occur when the arrector pili muscles contract, causing hairs to stand upright. This physiological response is triggered by various factors like cold temperatures or emotions. Choice B is incorrect as it describes whiskers on a rabbit's upper lip. Choice C is incorrect as sebum is related to skin oil production, not goose-flesh. Choice D is incorrect as it refers to uncooked pork meat, which is unrelated to the physiological mechanism of goose-flesh.