Identify the INCORRECT statement about the human ear: MCQ with Answer and Explanation

Identify the INCORRECT statement about the human ear:
A. The auditory nerve carries impulses to the brain.
B. The cochlea is responsible for balance.
C. The ossicles amplify sound vibrations.
D. The eardrum vibrates in response to sound waves.
Answer: Option B
Solution (By JKSSB Mock Tests)
The cochlea is for hearing; the vestibular apparatus (semicircular canals, utricle, saccule) is for balance. So C is incorrect.

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Question #1
Consider statements about human diseases: 1. Cholera is a bacterial disease. 2. Polio is a viral disease. 3. Malaria is transmitted by a mosquito. Which are correct?
A. 1 and 2 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3

Correct Answer: Option D


Explanation:
Cholera is an acute diarrheal illness caused by the bacterium Vibrio cholerae, typically transmitted through contaminated water. Polio (poliomyelitis) is a highly infectious viral disease caused by the poliovirus, which can lead to paralysis. Malaria is a life-threatening disease caused by Plasmodium parasites, which are transmitted to humans through the bites of infected female Anopheles mosquitoes. All three statements are correct.

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Question #2
The enzyme that catalyzes the synthesis of RNA primer during DNA replication is:
A. DNA polymerase
B. Ligase
C. Helicase
D. Primase

Correct Answer: Option D


Explanation:
Primase is an RNA polymerase that synthesizes short RNA primers complementary to the DNA template, providing a free 3'-OH for DNA polymerase to begin synthesis. Helicase unwinds, polymerase extends, ligase joins.

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The silkworm, Bombyx mori, feeds exclusively on the leaves of which plant during its larval stage?
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Correct Answer: Option B


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The domesticated silkworm, Bombyx mori, is a monophagous insect, meaning it feeds almost exclusively on the fresh leaves of the mulberry plant (primarily Morus alba). The quality and quantity of silk produced are directly dependent on the quality of the mulberry leaves consumed by the larvae. While tasar silkworms feed on oak and castor, the common mulberry silkworm requires Morus alba.

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