Biology (Part-IV) (UPSC)

Total Questions: 66

11. Among the following, which one lays eggs and does not produce young ones directly? [2008]

(a) Echidna
(b) Kangaroo
(c) Porcupine
(d) Whale

Correct Answer: (a) Echidna

Solution:Echinda is a mammal that lay eggs.

Echidnas are monotremes, egg-laying mammals. The only other living monotreme is the platypus.

12. The release of which one of the following into ponds and wells helps in controlling the mosquitoes? [2008]

(a) Crab
(b) Dogfish
(c) Gambusia fish
(d) Snail

Correct Answer: (c) Gambusia fish

Solution:Gambusia affinis is a larvivorous fish. This fish is released into ponds and wells. It feeds on mosquito larvae, insects and crustaceans.

13. Among the following, which one is not an ape? [2008]

(a) Gibbon
(b) Gorilla
(c) Langur
(d) Orangutan

Correct Answer: (c) Langur

Solution:Gibbon, Gorilla and Orangutan are apes, but Langur is not an ape, it is monkey.

14. In the context of genetic disorders, consider the following: A woman suffers from colour blindness while her husband does not suffer from it. They have a son and a daughter. In this context, which one of the following statements is most probably correct? [2009]

(a) Both children suffer from colour blindness.
(b) Daughter suffers from colour blindness while son does not suffer from it.
(c) Both children do not suffer from colour blindness.
(d) Son suffers from colour blindness while daughter does not suffer from it.

Correct Answer: (d) Son suffers from colour blindness while daughter does not suffer from it.

Solution:From the above graphical presentation we concluded that the son is the colourblind but the daughter is the carrier.

15. In the context of Indian wild life, the flying fox is a: [2009]

(a) Bat
(b) Kite
(c) Stork
(d) Vulture

Correct Answer: (a) Bat

Solution:Bats are commonly known as fruits bats or flying foxes. In India these are present in North-Eastern parts or in Andaman and Nicobar Islands.

16. With reference to the evolution of living organisms, which one of the following sequences is correct? [2009]

(a) Octopus-Dolphin-Shark
(b) Pangolin-Tortoise-Hawk
(c) Salamander-Python-Kangaroo
(d) Frog-Crab-Prawn

Correct Answer: (c) Salamander-Python-Kangaroo

Solution:According to evolution of living organisms Salamander-Python-Kangaroo, because the evolution started from amphibians 350 million years ago, reptiles appeared 300 million years ago and 200 million years ago first small mammals appeared.

Fish with stout and strong fins could move on land and go back to water. This was about 350 mya. These animals called lobefins evolved into the first amphibians that lived on both land and water. These were ancestors of modern day frogs and salamanders.

17. The Panda belongs to the same family as that of : [2009]

(a) Bear
(b) Cat
(c) Dog
(d) Rabbit

Correct Answer: (a) Bear

Solution:Panda and bear belongs to family Ursidae. Pandas are medium sized bears. Of all the endangered bear species they have the most distinguished colour combination.

18. The marine animal called Dugong which is vulnerable to extinction is : [2009]

(a) Amphibian
(b) Bony fish
(c) Shark
(d) Mammal

Correct Answer: (d) Mammal

Solution:Dugong is a large marine mammal. Dugong has a fusiform body with no dorsal fin or hind limbs, instead of possessing paddle. Dugong is heavily dependent on seagrass for subsistence. Dugong bear one calf at a time after an approximately 13 month gestation.

19. Widespread resistance of malarial parasite to drugs like chloroquine has prompted attempts to develop a malarial vaccine to combat malaria. Why is it difficult to develop an effective malaria vaccine? [2010]

(a) Malaria is caused by several species of Plasmodium
(b) Man does not develop immunity to malaria during natural infection
(c) Vaccines can be developed only against bacteria
(d) Man is only an intermediate host and not the definitive host.

Correct Answer: (b) Man does not develop immunity to malaria during natural infection

Solution:It is difficult to develop an effective malaria vaccine, because repeated natural infection does not produce detectable resistance to exo-erythrocytic cycle of malaria in man.

20. Consider the following statements: [2010]

1. Hepatitis B is several times more infectious than HIV/AIDS.

2. Hepatitis B can cause liver cancer.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Correct Answer: (c) Both 1 and 2

Solution:Hepatitis-B is a potentially life-threatening liver infection caused by the hepatitis B virus. It can cause chronic liver disease and puts people at high risk of death from cirrhoris of liver and liver cancer.

Hepatitis-B virus is transmitted between people by contact with blood or other body fluid of an contact with the blood or other body fluid.

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