11. Which of the following carries oxygen to various parts of human body?
[A] Red blood cells
[B] Nerves
[C] Plasma
[D] White blood cells
Show Answer
Correct Answer: A [Red blood cells]
Notes:
Hemoglobin is the protein inside red blood cells that carries oxygen. Red blood cells also remove carbon dioxide from your body, transporting it to the lungs for you to exhale.
12. Which of the following is the name given to the Inspection and dissection of a body after death in human beings as for determination of cause of death? (UPSC Prelims 1988)
[A] Autopsy
[B] Autotomy
[C] Autoesism
[D] Autograft
Show Answer
Correct Answer: A [Autopsy]
Notes:
An autopsy is a surgical procedure that consists of a thorough examination of a corpse by dissection to determine the cause, mode and manner of death or to evaluate any disease or injury that may be present for research or educational purposes.
13. Which of the following represent Dinosaurs? (UPSC Prelims 1989)
[A] A reptile
[B] An amphibian
[C] A mammal
[D] A bird
Show Answer
Correct Answer: A [A reptile]
Notes:
Dinosaurs were warm-blooded reptiles. Mammal bone study sheds light on dinosaur physiology.
14. Consider the following effects of genetic engineering:
- Disease resistance
- Growth promotion
- Closing
- Longevity
Of these effects, those that have be entried out with a certain amount of success include (UPSC Prelims 1990)
[A] 1, 3 and 4
[B] 2, 3 and 4
[C] 1, 2 and 4
[D] 1, 2 and 3
Show Answer
Correct Answer: D [1, 2 and 3]
Notes:
Genetic engineering can have effects on many things but till now the scientists have not found any way to increase longevity by genetic engineering.
15. Which organelle in the cell, other than nucleus, contains DNA? (UPSC Prelims 2001)
[A] Centriole
[B] Golgi apparatus
[C] Lysosome
[D] Mitochondrion
Show Answer
Correct Answer: D [Mitochondrion]
Notes:
Mitochondrion is the organelle in the cell, other than nucleus that contains DNA. Mitochondria are the working organelles that keep the cell full of energy. Mitochondria are small organelles floating free throughout the cell. Some cells have several thousand mitochondria while others have none. Muscle cells need a lot of energy so they have loads of mitochondria.
16. Consider the following statements:
- Tapeworm is a hermaphrodite.
- Round-worm has separate sexes.
- Filaria is caused by a nematode.
- Guinea-worm is an annelid.
Which of these are correct? (UPSC Prelims 2001)
[A] Only 1 and 2
[B] 1, 2 and 3
[C] 3 and 4
[D] 2, 3 and 4
Show Answer
Correct Answer: B [1, 2 and 3]
Notes:
Filariasis is a parasitic disease caused by an infection with roundworms of the Filarioidea type. These are spread by blood-feeding diptera such as black flies and mosquitoes. Lymphatic filariasis is caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. Unlike this, a tapeworm is a hermaphrodite, which means that it has both male and female reproductive organs, and Round-worm has separate sexes.
17. Which of the following correctly defines an Antigen? (UPSC Prelims 2002)
[A] Lowers body temperature
[B] destroys harmful bacteria
[C] triggers the immune system
[D] is used as an antidote to poison
Show Answer
Correct Answer: C [triggers the immune system]
Notes:
An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.
18. Deficiency in which among the following leads to beriberi disease?
[A] Vitamin B1
[B] Vitamin B2
[C] Vitamin B3
[D] Vitamin B6
Show Answer
Correct Answer: A [Vitamin B1]
Notes:
Vitamin B1/Thiamine deficiency leads to a disease called beriberi. Over polishing of rice also leads to beriberi.
19. Which vitamin is also called as retinol?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin K
Show Answer
Correct Answer: A [Vitamin A]
Notes:
Vitamin A is also called as retinol deficiency of which results in xeropthalmia. Chemical formula for Vitamin A is C20H30O.
20. In photosynthesis, light energy is converted into which form of energy?
[A] Electrical energy
[B] Kinetic energy
[C] Chemical energy
[D] Potential energy
Show Answer
Correct Answer: C [Chemical energy]
Notes:
In the process of photosynthesis, the energy from solar light is converted into the chemical energy.
