Melanoblasts lie-

Correct Answer: C

Rationale: The correct answer is C: In stratum malpighi. Melanoblasts are responsible for producing melanin, the pigment that gives skin its color. They are located in the stratum malpighi layer of the epidermis, where they transfer melanin to nearby keratinocytes. Choice A is incorrect because the stratum corneum is the outermost layer of the epidermis composed of dead cells. Choice B is incorrect as the dermis is a layer of skin beneath the epidermis. Choice D is incorrect because melanoblasts are located in the stratum malpighi, not at the junction of epidermis and dermis.

Correct Answer: D

Rationale: The correct answer is D, Stratum lucidum of skin. This layer is a thin, transparent layer found in the epidermis of the skin, specifically in hairless areas of the body. It is composed of dead skin cells that are flattened and densely packed. The transparency of this layer is due to the lack of organelles and nuclei in the cells, allowing light to pass through easily. The other choices (A: Stratum spongiosum, B: Epidermis, C: Stratum compactum) do not accurately represent the transparent layer formed in the skin. The epidermis as a whole contains multiple layers, with the stratum lucidum being the specific layer responsible for transparency.

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.