31. Which part of the human brain is known as the thalamus?
[A] The main part
[B] The back part
[C] The relay station
[D] The small part
Show Answer
Correct Answer: C [The relay station]
Notes:
The thalamus in the human brain serves as an important relay station. It is large, two-lobed organ that resides in the midbrain. The thalamus’ primary role is to transfer motor and sensory signals to the cerebral cortex. Most sensory information (expect olfaction) goes through the thalamus before being routed to the cortex. It also regulates sleep and alertness.
32. Name the multipolar neuron which is located entirely within the central nervous system.
[A] Motor neuron
[B] Efferent neuron
[C] Afferent neuron
[D] Interneuron
Show Answer
Correct Answer: D [Interneuron]
Notes:
Interneurons are multipolar neurons, they are found within the CNS. Motor neurons are also known as efferent neurons. They transfer signals from the CNS to the effector organs.
33. Which does not act as a protective barrier for the surface of the body?
[A] Skin
[B] Mucus
[C] Gastric acid
[D] Salivary amylase
Show Answer
Correct Answer: D [Salivary amylase]
Notes:
Salivary amylase does not act as a protective barrier for the surface of the body.
34. The human alimentary canal runs from the mouth to the anus and is approximately how many meters long?
[A] 4 m
[B] 15 m
[C] 9 m
[D] 1 m
Show Answer
Correct Answer: C [9 m]
Notes:
The human alimentary canal runs from the mouth to the anus and is approximately 9 meters long.
35. Which of the following is the method of cellular defense in animals and plants?
[A] Recombinant DNA technology
[B] RNA interference
[C] Immune response
[D] Mutation
Show Answer
Correct Answer: B [RNA interference]
Notes:
RNA interference is the method of cellular defense in animals and plants.
36. Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface?
[A] Aerial parts only
[B] Roots only
[C] Both aerial parts and roots
[D] Neither aerial parts nor roots
Show Answer
Correct Answer: A [Aerial parts only]
Notes:
The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.
37. The Bacille Calmette-Guerin vaccine (popularly called BCG vaccine) is a vaccine to prevent which of these diseases?
[A] Polio
[B] Jaundice
[C] Tuberculosis
[D] Typhoid
Show Answer
Correct Answer: C [Tuberculosis]
Notes:
The Bacillus Calmette–Guérin (BCG) vaccine is used to prevent tuberculosis (TB). The BCG vaccine is named after Dr Albert Calmette and Dr Camille Guerin, who developed the vaccine from a germ called Mycobacterium bovis, which is similar to TB. BCG is a live vaccine that has been processed so that it is not harmful to humans. Tuberculosis is an infectious disease caused by bacteria that affects the lungs, and sometimes other parts of the body.
38. Silk worms feed on
____:
[A] Basil leaves
[B] Mulberry leaves
[C] Curry leaves
[D] Rose leaves
Show Answer
Correct Answer: B [Mulberry leaves]
Notes:
Silk worms are the larva of a moth (Bombyx mori) native to Asia that spins a cocoon of fine, strong, lustrous fiber that is the source of commercial silk. Silkworms feed on the leaves of the mulberries (genus- Morus) and sometimes on the Osage orange (Maclura pomifera).
39. Who among the following is known as Father of Biology?
[A] Edward Jenner
[B] Darwin
[C] Aristotle
[D] Heckle
Show Answer
Correct Answer: C [Aristotle]
Notes:
Greek philosopher Aristotle is regarded as the Father of Biology. According to him, grouping of organisms had to be done on the basis of a number of characteristics and not just one. He is considered to be the first person to come up with a classification that still stands. His text ‘History of Animals’ is a landmark in the history of biology.
40. Which part of brain maintains posture and balance of human body?
[A] Cerebrum
[B] Pons
[C] Cerebellum
[D] Medulla
Show Answer
Correct Answer: A [Cerebrum]
Notes:
• Cerebellum is located under the cerebrum. Function: Coordinate muscle movements, maintain posture, and balance of the body.
• Cerebrum is the largest part of the brain. Function: Controls all our voluntary functions, as well as our thinking, vision, hearing etc.
• Pons is the largest part of the brainstem. Function: Sensory functions including arousal, respiratory processes, fine motor control, equilibrium, muscle tone, and the Circadian cycle.
• Medulla is the lowest part of the brainstem. Function: Relay of nerve signals between the brain and spinal cord, Coordination of body movements and Mood regulation.
