General Science Jkssb Biology Set 1 Mcqs (605 MCQs) | JKSSB & SSC Quiz

General Science

jkssb biology set 1 mcqs

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Practice Questions

605 Total
Question 281 Discuss
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Identify the correctly matched pair of the disease and its vector

A
Malaria - Culex mosquito
B
Dengue - Aedes aegypti
C
Sleeping Sickness - Sand fly
D
Filariasis - Anopheles mosquito

Answer & Explanation

Correct Option: B

Dengue is transmitted by Aedes aegypti; Malaria by Anopheles; Sleeping Sickness by Tsetse fly.
Question 282 Discuss
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What is the function of the enzyme Lysozyme found in human tears and saliva

A
Breakdown of proteins
B
Digestion of starch
C
Destruction of bacterial cell walls
D
Inhibition of viral replication

Answer & Explanation

Correct Option: C

Lysozyme is an antibacterial enzyme that attacks the peptidoglycan layer of bacterial cell walls.
Question 283 Discuss
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The structural and functional unit of the human kidney is

A
Neuron
B
Nephron
C
Ureter
D
Glomerulus

Answer & Explanation

Correct Option: B

Each kidney contains about a million nephrons that filter blood and form urine.
Question 284 Discuss
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Which of the following statements about Phloem is true

A
It transports water and minerals from roots to leaves
B
It is composed of dead cells at maturity
C
It transports food materials from leaves to other parts of the plant
D
The flow of materials in phloem is strictly unidirectional

Answer & Explanation

Correct Option: C

Phloem translocation is bidirectional and involves living cells like sieve tube elements.
Question 285 Discuss
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The disease 'Atheletes Foot' is caused by which of the following

A
Bacteria
B
Fungus
C
Protozoa
D
Nematode

Answer & Explanation

Correct Option: B

Athlete's foot is a fungal infection (Tinea pedis) that usually begins between the toes.
Question 286 Discuss
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Which endocrine gland is often referred to as the 'Biological Clock' of the human body

A
Pituitary gland
B
Pineal gland
C
Thyroid gland
D
Thymus gland

Answer & Explanation

Correct Option: B

The pineal gland secretes melatonin, which regulates circadian rhythms and sleep-wake cycles.
Question 287 Discuss
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The genetic material of a Retrovirus like HIV is

A
Double stranded DNA
B
Single stranded DNA
C
Single stranded RNA
D
Double stranded RNA

Answer & Explanation

Correct Option: C

Retroviruses contain RNA and use reverse transcriptase to convert it into DNA inside the host cell.
Question 288 Discuss
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In the human body the process of 'Dialysis' is used when which organ fails to function properly

A
Heart
B
Liver
C
Kidneys
D
Lungs

Answer & Explanation

Correct Option: C

Dialysis is an artificial way of filtering waste products and excess water from the blood when kidneys cannot.
Question 289 Discuss
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Which of the following is not a greenhouse gas

A
Methane
B
Carbon dioxide
C
Nitrous oxide
D
Nitrogen

Answer & Explanation

Correct Option: D

Nitrogen and Oxygen (the bulk of the atmosphere) do not trap heat; greenhouse gases include CO2, CH4, and N2O.
Question 290 Discuss
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The 'Islets of Langerhans' are found in which organ

A
Liver
B
Pancreas
C
Spleen
D
Pituitary

Answer & Explanation

Correct Option: B

These are clusters of endocrine cells in the pancreas that produce insulin and glucagon.
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