11. What is the number of the Chromosomes affected by Turner syndrome?
[A] 44
[B] 45
[C] 46
[D] 47
Show Answer
Correct Answer: B [45]
Notes:
Chromosomes number 45 is affected by Turner syndrome. Turner syndrome is a condition which affects only females. It results when one of the X chromosomes (sex chromosomes) is missing or partially missing.
12. Pest-resistant cotton commonly known as ‘Bt-Cotton’ is genetically engineered by inserting a gene from a:
[A] Bacterium
[B] Virus
[C] Microalgae
[D] Protist
Show Answer
Correct Answer: A [Bacterium]
Notes:
Bt cotton is an insect-resistant transgenic crop designed to combat the bullworm. Bt is a soil bacterium containing Cry genes that encode crystal proteins which are fatal to some Lepidopteran caterpillars when ingested.
13. Memory loss would most likely be due to a malfunction of which part of the brain?
[A] Medulla
[B] Cerebellum
[C] Cerebrum
[D] Pons
Show Answer
Correct Answer: C [ Cerebrum]
Notes:
Memory loss would most likely be due to a malfunction of the cerebrum. The cerebrum controls all voluntary activities and receives and interprets sensory information. The medulla controls involuntary actions such as breathing. The cerebellum coordinates muscle activity and controls balance. The pons is a mass of nerve fibers running across the surface of the mammalian brain.
14. What is caused by the deficiency of Vitamin D?
[A] Rickets
[B] Night blindness
[C] Pellagra
[D] Scurvy
Show Answer
Correct Answer: A [Rickets]
Notes:
Rickets is a skeletal disorder that’s caused by a lack of vitamin D, calcium, or phosphate. These nutrients are important for the development of strong, healthy bones. People with rickets may have weak and soft bones, stunted growth, and, in severe cases, skeletal deformities.
15. Which of the following is the reason behind when one enters a dark room; he is not able to see anything but after some time his vision improves?
[A] The retina of the eye comes forward
[B] The retina of the eye moves backward
[C] The pupil of the eye contracts
[D] The pupil of the eye dilates
Show Answer
Correct Answer: D [The pupil of the eye dilates]
Notes:
Our eyes cannot see everything clearly when we enter a dark room from a bright light. This is due to the reason that in dark room the pupil is large so when we come out in bright light, a large amount of light enters our eyes and we feel glare.
16. Which among the following is the characteristic feature of virus?
[A] It is made of fats
[B] It multiplies only on dead animals
[C] It multiplies only on hosts
[D] It lacks chlorophyll
Show Answer
Correct Answer: C [It multiplies only on hosts]
Notes:
They are unique because they are only alive and able to multiply inside the cells of other living things. The cell they multiply in is called the host cell. A virus is made up of a core of genetic material, either DNA or RNA, surrounded by a protective coat called a capsid which is made up of protein.
17. Consider the following conditions of sick human body
1. Swollen lymph nodes
2. Sweating at night
3. Loss of memory
4. Loss of weight
Which of these are the symptoms of AIDS?
[A] 1 and 2
[B] 2, 3 and 4
[C] 1, 2 and 3
[D] 1, 2, 3 and 4
Show Answer
Correct Answer: D [1, 2, 3 and 4]
Notes:
AIDS is a viral disease. In this disease the immune system weakens and the body becomes prone to different type of infection by pathogens. Sweating at night, swollen lymph nodes, loss of memory and loss of weight are also symptoms of AIDS.
18. 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.
19. The branch of science that deals with the study of the mental faculties of the brain including emotions is known as__?
[A] Phenology
[B] Phycology
[C] Phrenology
[D] Proctology
Show Answer
Correct Answer: C [Phrenology]
Notes:
The branch of science that deals with the study of the mental faculties of the brain including emotions is known as Phrenology.
20. Which of the following is hemoglobin?
[A] Primary structure
[B] Secondary structure
[C] Tertiary structure
[D] Quaternary structure
Show Answer
Correct Answer: D [Quaternary structure]
Notes:
Hemoglobin has a quaternary structure. It consists of two pairs of separate proteins, designated α and β chains.
