28. Which of the following is true? (A) Birds are the only living animals with f

Question

28. Which of the following is true? (A) Birds are the only living animals with feathers. (B) All birds can t (C) The bones of birds are solid. (D) Birds' down feathers are for flight. 29, Which of the following is NOT true? (A) Mammals have a low metabolic rate. (B) Mammals have hair. (C) Mammals have glands that secrete milk. (D) Mammals have a four-chambered heart. 30. Most primates are (A) insectivores. (B) herbivores. (C) carnivores. (D) omnivores. 31. Inhalation of air into the lungs of a mammal occurs when (A) the diaphragm relaxes. (C) the lungs relax. (B) the diaphragm contracts. (D) the lungs contract.

Explanation / Answer

Answer

Question 28 - The option (A) is correct. Birds are the only living animals with feathers.

Explanation - Because feathers is typical or unique characterstics of birds. It only evolve into order Aves.Birds with help of feathers they can fly.

Question 29 - The option (A) is correct .Mammals have low metabolic rate.

Explanation - it is wrong statement. Because mammals have high requirement of energy. Breakdown of Food regularly to obtain energy. So mammals have high metabolic rate.

Question 30 - The option (B) is correct. Herbivores

Explanation - most primates are herbivores because they depends on producer/plants for food.

Question 31 -The option (B) is correct .The diaphram contract

Explanation - During inspiration, diaphragm contract to increase thoracic volume do incoming fresh air. This, diaphragm contraction takes place.

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