31. The least distance of distinct vision for a young adult with normal vision is __
[A] 25 m
[B] 20 m
[C] 25 cm
[D] 20 cm
Show Answer
Correct Answer: C [25 cm]
Notes:
The least distance of distinct vision for a young adult with normal vision is 25 cm.
32. How many types of joints are present in our body?
[A] 2
[B] 3
[C] 5
[D] 6
Show Answer
Correct Answer: B [3]
Notes:
The human body has three main types of joints.
1. synarthrosis
2. amphiarthrosis
3. diarthrosis
33. How many chambers are there in the human heart?
[A] Two
[B] Three
[C] Four
[D] None of these
Show Answer
Correct Answer: C [Four]
Notes:
The human heart is divided into four chambers: two upper chambers called atria, and two lower chambers called ventricles.
34. The branch of biology that studies the immune system in all organisms.
[A] Botany
[B] Microbiology
[C] Immunology
[D] Biotechnology
Show Answer
Correct Answer: C [Immunology]
Notes:
Immunology is a branch of biology that studies the immune system in all organisms.
35. The corpus luteum is the source of secretion of:
[A] LH
[B] Estradiol
[C] Estrogen
[D] Progesterone
Show Answer
Correct Answer: D [Progesterone]
Notes:
The corpus luteum is the source of secretion of Progesterone. Progesterone is a hormone released by the ovaries.
36. Which of the following organs is majorly affected by hepatitis?
[A] liver
[B] heart
[C] kidney
[D] brain
Show Answer
Correct Answer: A [liver]
Notes:
The liver is majorly affected by hepatitis. It is a viral disease that causes anorexia of the liver, resulting in liver damage or jaundice.
37. Azolla enriches rice fields with nitrogen due to its association with?
[A] Anabaena
[B] Nostoc
[C] Rhizobium
[D] Frankia
Show Answer
Correct Answer: A [Anabaena]
Notes:
Azolla enriches rice fields with nitrogen due to its association with Anabaena.
38. Green Revolution related to which of the following?
[A] Milk
[B] Agriculture
[C] Water
[D] Animals
Show Answer
Correct Answer: B [Agriculture]
Notes:
Green Revolution related to Agriculture. It took place between 1950-1960 and focused mainly on increasing agricultural production and started in Mexico.
39. Which metal microparticles are used in gene guns?
[A] Aurum
[B] Nitrogen
[C] Magnesium
[D] Cuprum
Show Answer
Correct Answer: A [Aurum]
Notes:
The gene gun technique uses gold-coated microparticles along with the DNA. Aurum is a Latin word for gold. The other metal used for this technique is tungsten.
40. Fat present below the skin surface in our body acts as a barrier against ____:
[A] Loss of heat from the body
[B] Loss of salt from the body
[C] Loss of essential body fluids
[D] Entry of harmful micro-organisms from the environment
Show Answer
Correct Answer: A [Loss of heat from the body]
Notes:
A layer of body fat acts as an insulator and traps heat. The subcutis is the deepest layer of skin. The subcutis, consisting of a network of collagen and fat cells, helps conserve the body’s heat and protects the body from injury by acting as a “shock absorber.
