Thick hairy skin is found in bear because, it lives in

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: C

Rationale: The correct answer is C: Skin. In mammals, maximum energy is lost through the skin in the form of heat. This is due to the process of thermoregulation, where excess body heat is released through the skin to maintain a stable internal temperature. Respiration (choice A) is essential for energy production, urine (choice B) primarily eliminates waste products, and stool (choice D) is the result of undigested food. Skin, on the other hand, plays a crucial role in regulating body temperature and dissipating excess energy in the form of heat, making it the primary route for energy loss in mammals.

Correct Answer: C

Rationale: Certainly! The correct answer is C: Perspiration. Copious sweat secretion is the body's way of regulating temperature through evaporative cooling. Blubber (A) refers to a layer of fat in marine mammals. Pelage (B) refers to an animal's fur or hair. Goose flesh (D) is the raised bumps on the skin due to cold or emotional stress. Perspiration is the specific term for the secretion of sweat by sweat glands for thermoregulation, making it the correct choice in this context.

Correct Answer: A

Rationale: The correct answer is A: Panniculus carnosus. This muscle is responsible for moving and shaking the skin, particularly in animals. It is a thin layer of muscle found in the subcutaneous tissue. It contracts to create goosebumps and aid in thermoregulation. The other choices, B: Collagen fibers, C: Sphincter muscles, and D: Arrector pili, do not directly move and shake the skin. Collagen fibers provide structural support, sphincter muscles control the opening and closing of passages, and arrector pili are responsible for hair erection, not skin movement.

Correct Answer: C

Rationale: The correct answer is C: Columnar. The cells of stratum malpighi are columnar in shape as they are tall and rectangular, providing structural support and protection to the underlying layers of skin. The other choices are incorrect because A: Oval, B: Flat, and D: Spherical do not accurately describe the shape of cells in stratum malpighi. The cells in this layer are specifically columnar to serve their function in the epidermis.