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 121 Discuss
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In the animal kingdom, which of the following phyla includes animals with a segmented body?

A
Arthropoda
B
Annelida
C
Mollusca
D
Chordata

Answer & Explanation

Correct Option: B

The phylum Annelida definitively groups together uniquely segmented worms, such as earthworms and leeches, anatomically characterized by distinct ring-like internal and external bodily segments called metameres.
Question 122 Discuss
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Who first postulated that cells are generated from pre-existing cells?

A
William Harvey
B
Carl Linnaeus
C
Rudolf Virchow
D
Jennifer Doudna

Answer & Explanation

Correct Option: C

In 1855, esteemed German physician Rudolf Virchow formally expanded cell theory by popularizing the defining biological concept of 'Omnis cellula e cellula,' meaning absolutely all cells arise only from pre-existing cells.
Question 123 Discuss
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In animal cells, the breakdown of very long chain fatty acids through 𝛽-oxidation is conducted by which of the following organelles?

A
Golgi apparatus
B
Mitochondria
C
Peroxisome
D
Ribosome

Answer & Explanation

Correct Option: C

Peroxisomes crucially contain specific oxidative enzymes that must perform the initial stages of beta-oxidation on very long-chain fatty acids before the shortened chains can be sent to the mitochondria for further processing.
Question 124 Discuss
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The percentage of sunlight energy absorbed by the green plants in a terrestrial ecosystem is about .

A
0.5%
B
1%
C
2%
D
1.5%

Answer & Explanation

Correct Option: B

Due to reflection, transmission, and thermodynamic inefficiencies, terrestrial green plants generally capture and successfully convert only about 1% of the total incident solar energy into stored chemical energy.
Question 125 Discuss
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By what name is the species of Scaphopoda Mollusca 'Dentalium' commonly known?

A
Duck mussel
B
Heart clam
C
Head foot
D
Tusk shells

Answer & Explanation

Correct Option: D

Members of the distinct molluscan genus Dentalium are universally called tusk shells because their rigid, tubular, and naturally tapering shells visually resemble miniature elephant tusks.
Question 126 Discuss
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Which of the following cell organelles possesses their own DNA and can synthesise protein for their functions?

A
Centrosome
B
Chloroplast
C
Golgi complex
D
Endoplasmic reticulum

Answer & Explanation

Correct Option: B

Similar to mitochondria, chloroplasts are highly unique, semi-autonomous organelles that contain their own isolated circular DNA and localized ribosomes, granting them the ability to independently synthesize some of their own proteins.
Question 127 Discuss
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Which of the following groups of plants are categorised as cryptogams?

A
Gymnosperms and Angiosperms
B
Thallophyta and Gymnosperms
C
Pteridophyta and Angiosperms
D
Bryophytes and Thallophyta

Answer & Explanation

Correct Option: D

The term cryptogam scientifically refers to lower plants that reproduce discretely via spores rather than seeds, primarily encompassing the distinct groups Thallophyta, Bryophyta, and Pteridophyta.
Question 128 Discuss
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The cytoplasmic zone surrounding the Golgi complex possesses no cell organelles. This zone of clear cytoplasm is called:

A
cytosol
B
zone of exclusion
C
cytosine
D
cytochrome

Answer & Explanation

Correct Option: B

The highly active Golgi apparatus is closely surrounded by a distinct, functionally clear region of the cytoplasm appropriately termed the zone of exclusion, which remains notably devoid of other large organelles.
Question 129 Discuss
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Which of the following is NOT a function of mesosomes?

A
DNA replication and distribution to daughter cells (
B
Respiration
C
Increase the surface area of the plasma membrane and enzymatic content
D
Locomotion

Answer & Explanation

Correct Option: D

Mesosomes are heavily folded membrane invaginations observed in bacteria that assist in respiration and cellular division, but they are completely structurally distinct from flagella and play zero role in biological locomotion.
Question 130 Discuss
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What is the term for the maximum population size that an environment can sustain indefinitely?

A
Ecological niche
B
Biotic potential
C
Pioneer species
D
Carrying capacity

Answer & Explanation

Correct Option: D

Carrying capacity formally represents the theoretical maximum number of individual organisms of a specific species that a localized ecosystem can sustainably support long-term, given its naturally available resources.
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