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 151 Discuss
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Identify the structure that controls the size of the pupil.

A
Vitreous humour
B
Iris
C
Ciliary muscles
D
Cornea

Answer & Explanation

Correct Option: B

Anatomically, the iris is a highly pigmented, dynamic muscular ring positioned in the eye that reflexively dilates and strictly constricts to carefully physically regulate the exact amount of ambient light allowed to enter the pupil.
Question 152 Discuss
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Identify an organelle found both in eukaryotic as well as prokaryotic.

A
Endosomes
B
Ribosomes
C
Lysosomes
D
Mitochondria

Answer & Explanation

Correct Option: B

Small ribosomes are universally essential biological factories strictly required for active cellular protein synthesis and definitively remain the only major organelles consistently present in both simple prokaryotic cells and highly complex eukaryotic cells.
Question 153 Discuss
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To what phylum does a blood sucking leech belong?

A
Arthropoda
B
Nematoda
C
Platyhelminthes
D
Annelida

Answer & Explanation

Correct Option: D

Parasitic, blood-sucking leeches are taxonomically heavily classified directly under the phylum Annelida exclusively because they possess the defining physical characteristic of internally and externally segmented, ring-like bodies.
Question 154 Discuss
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The body of the phylum is unsegmented and dorsoventrally flattened.

A
Coelenterata
B
Arthropoda
C
Platyhelminthes
D
Mollusca

Answer & Explanation

Correct Option: C

Diverse members of the phylum Platyhelminthes, commonly known scientifically as flatworms, uniformly exhibit distinct bilateral anatomical symmetry and a highly characteristic evolutionary dorsoventrally flattened, entirely unsegmented biological body plan.
Question 155 Discuss
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Which term was first used by Ernst Haeckel in 1866 to refer to 'the relation of animals to both the organic as well as the inorganic environment'?

A
Biosphere
B
Ecosystem
C
Ecology
D
Biome

Answer & Explanation

Correct Option: C

The pioneering German zoologist Ernst Haeckel officially coined the modern scientific term 'ecology' (derived heavily from the Greek 'oikos', directly meaning house) to comprehensively describe the holistic study of an organism's complex interactions with its environment.
Question 156 Discuss
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Identify the organism that shows bioluminescence.

A
Earthworm
B
Amoeba
C
Firefly
D
Tapeworm

Answer & Explanation

Correct Option: C

Biologically, adult fireflies naturally exhibit bright, observable bioluminescence, actively utilizing a highly specialized internal enzymatic chemical reaction involving the compound luciferin and atmospheric oxygen to efficiently produce cold light for active mate attraction.
Question 157 Discuss
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Which hairpin-like structure serves to anchor and stabilise the tick's mouthparts to its host's skin and to channel the exchange of fluids?

A
Peduncle
B
Substratum
C
Hypostome
D
Trunk

Answer & Explanation

Correct Option: C

Evolutionarily, the hypostome is a highly specialized, heavily barbed central feeding tube in parasitic ticks that securely physically anchors them deep into the host's dermal skin layer while efficiently facilitating long-term blood withdrawal.
Question 158 Discuss
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What is the fourth step in mitosis where non-kinetochore spindle fibres lengthen and elongate the cell?

A
Telophase
B
Metaphase
C
Anaphase
D
Prophase

Answer & Explanation

Correct Option: C

Mechanically, during cellular anaphase, the previously paired sister chromatids are forcibly pulled aggressively apart toward opposite cellular poles while overlapping non-kinetochore spindle fibers actively push against each other to significantly elongate the entire cell.
Question 159 Discuss
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Which bacteria have a thick cell wall with several layers of peptidoglycan and teichoic acid?

A
Staphylococcus aureus
B
Pseudomonas aeruginosa
C
Salmonella enterica
D
Escherichia coli

Answer & Explanation

Correct Option: A

Structurally, Staphylococcus aureus is categorized heavily as a Gram-positive bacterium, biologically meaning it possesses a remarkably thick outer cell wall predominantly composed of heavily cross-linked peptidoglycan laced with teichoic acid.
Question 160 Discuss
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Which of the following is required by the aquatic animals to breathe under water?

A
Dissolved CO2
B
Dissolved H2 S
C
Dissolved Oxygen
D
Dissolved Nitrogen

Answer & Explanation

Correct Option: C

Evolutionarily, aquatic animals heavily utilize structurally specialized respiratory organs like lamellar gills to efficiently physically extract life-sustaining dissolved oxygen directly from the naturally surrounding marine or freshwater column.
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