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 311 Discuss
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The movement of sunflower towards the sun is an example of

A
Phototropism
B
Hydrotropism
C
Thigmotropism
D
Geotropism

Answer & Explanation

Correct Option: A

Phototropism is the growth or movement of a plant in response to light direction.
Question 312 Discuss
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Identify the non-communicable disease from the following

A
Tuberculosis
B
Cholera
C
Diabetes
D
Influenza

Answer & Explanation

Correct Option: C

Non-communicable diseases are chronic conditions that cannot be transmitted from person to person.
Question 313 Discuss
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What is the primary function of the Eustachian tube in the human ear

A
To magnify sound vibrations
B
To equalize air pressure on both sides of the eardrum
C
To maintain body balance
D
To secrete earwax

Answer & Explanation

Correct Option: B

The Eustachian tube connects the middle ear to the nasopharynx, ensuring pressure equilibrium.
Question 314 Discuss
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Which component of blood plays a vital role in blood clotting at the site of injury

A
Erythrocytes
B
Leukocytes
C
Thrombocytes
D
Plasma Proteins

Answer & Explanation

Correct Option: C

Thrombocytes (platelets) release clotting factors and form a plug at the wound site.
Question 315 Discuss
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The 'Laws of Inheritance' were formulated by

A
Darwin
B
Mendel
C
Lamarck
D
De Vries

Answer & Explanation

Correct Option: B

Gregor Johann Mendel is known as the 'Father of Genetics' for his work on pea plants.
Question 316 Discuss
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In a plant cell the enzymes for 'Photorespiration' are found in

A
Chloroplast Mitochondria and Peroxisomes
B
Chloroplast and Mitochondria only
C
Mitochondria and Ribosomes
D
Chloroplast and Lysosomes

Answer & Explanation

Correct Option: A

Photorespiration is a complex process involving three organelles: chloroplasts, peroxisomes, and mitochondria.
Question 317 Discuss
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Which of the following is a symptom of Hemophilia

A
Inability to see in dim light
B
Delay in blood clotting after injury
C
Softening of bones
D
Swelling of thyroid gland

Answer & Explanation

Correct Option: B

Hemophilia is a genetic disorder where the blood lacks specific clotting factors (VIII or IX).
Question 318 Discuss
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The total number of bones in a human adult skeleton is

A
300
B
206
C
210
D
180

Answer & Explanation

Correct Option: B

Infants have about 300 bones, many of which fuse together to form 206 bones in adulthood.
Question 319 Discuss
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Biological magnification is a phenomenon where

A
Cells increase in size under a microscope
B
Concentration of a toxicant increases at successive trophic levels
C
Population of a species increases exponentially
D
Microbes decompose organic waste rapidly

Answer & Explanation

Correct Option: B

Non-biodegradable chemicals like DDT accumulate and become more concentrated as they move up the food chain.
Question 320 Discuss
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Which hormone regulates the 'Milk Ejection Reflex' during breastfeeding

A
Prolactin
B
Estrogen
C
Oxytocin
D
Progesterone

Answer & Explanation

Correct Option: C

Prolactin stimulates milk production, while Oxytocin (the love hormone) causes milk let-down or ejection.
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