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 251 Discuss
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During strenuous exercise the accumulation of which substance leads to muscle fatigue and cramps

A
Pyruvic acid
B
Lactic acid
C
Ethyl alcohol
D
Carbonic acid

Answer & Explanation

Correct Option: B

Anaerobic respiration in muscle cells produces lactic acid when oxygen supply is insufficient for aerobic respiration.
Question 252 Discuss
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Which part of the human brain is primarily responsible for maintaining posture equilibrium and muscular coordination

A
Cerebrum
B
Medulla Oblongata
C
Cerebellum
D
Hypothalamus

Answer & Explanation

Correct Option: C

The cerebellum coordinates voluntary movements and maintains balance and body equilibrium.
Question 253 Discuss
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Assertion A Enzymes are highly specific in their action Reason R Enzymes have specific active sites that match only certain substrates

A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false
D
A is false but R is true

Answer & Explanation

Correct Option: A

The Lock and Key model explains that the specificity of enzymes is due to the unique shape of their active sites.
Question 254 Discuss
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The double helix structure of DNA is held together by which type of chemical bonds between nitrogenous bases

A
Peptide bonds
B
Phosphodiester bonds
C
Hydrogen bonds
D
Glycosidic bonds

Answer & Explanation

Correct Option: C

While phosphodiester bonds form the backbone, hydrogen bonds connect the complementary base pairs (A-T, G-C).
Question 255 Discuss
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In an ecosystem the ten percent law related to energy transfer was proposed by

A
Charles Elton
B
Raymond Lindeman
C
Arthur Tansley
D
Eugene Odum

Answer & Explanation

Correct Option: B

Lindeman's law states that only 10% of the energy is transferred from one trophic level to the next.
Question 256 Discuss
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Which of the following is an example of an autosomal recessive genetic disorder

A
Huntingtons disease
B
Sickle cell anemia
C
Haemophilia
D
Color blindness

Answer & Explanation

Correct Option: B

Sickle cell anemia is autosomal recessive; Haemophilia and Color blindness are X-linked recessive.
Question 257 Discuss
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In the human digestive system the function of Bile can be best described as

A
Digestion of proteins into amino acids
B
Emulsification of fats and making the medium alkaline
C
Conversion of starch into maltose
D
Absorption of water from the large intestine

Answer & Explanation

Correct Option: B

Bile, produced by the liver, breaks down large fat globules into smaller ones (emulsification) and neutralizes stomach acid.
Question 258 Discuss
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Which phytohormone is primarily responsible for cell division and delaying senescence in plants

A
Auxins
B
Gibberellins
C
Cytokinins
D
Abscisic acid

Answer & Explanation

Correct Option: C

Cytokinins promote cytokinesis (cell division) and help keep leaves green longer by delaying aging.
Question 259 Discuss
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The primary cause of the blue baby syndrome is the presence of which pollutant in drinking water

A
Fluoride
B
Arsenic
C
Nitrate
D
Mercury

Answer & Explanation

Correct Option: C

Nitrates in water convert to nitrites in the body, which react with hemoglobin to form methemoglobin, reducing oxygen transport.
Question 260 Discuss
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The process of double fertilization is a characteristic feature of which group of plants

A
Bryophytes
B
Pteridophytes
C
Gymnosperms
D
Angiosperms

Answer & Explanation

Correct Option: D

In angiosperms, one sperm cell fuses with the egg and another with the polar nuclei to form the endosperm.
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