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 231 Discuss
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Why are viruses generally considered non-living outside a host cell?

A
They camouflage themselves as non living to find a host.
B
They lack cell membrane and other organelles.
C
They lack DNA.
D
They need heat of the hosts body to multiply.

Answer & Explanation

Correct Option: B

Viruses are obligate intracellular parasites. Outside a living host cell, they lack the foundational cellular machinery, membranes, organelles, and enzymes necessary to carry out independent metabolic processes or reproduction.
Question 232 Discuss
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Besides the cell organelles, there are various types of non-living components within a cell, which are known as:

A
Cytoplasmic Inclusion
B
Plasmodesmata
C
Tubules
D
Microfibrils

Answer & Explanation

Correct Option: A

Cytoplasmic inclusions are non-living, non-motile substances temporarily suspended in the cytosol. They generally consist of stored nutrients, secretory products, or pigment granules, such as glycogen or lipid droplets.
Question 233 Discuss
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Which of the following is an example of a gymnosperm?

A
Fern
B
Cycas
C
Mosses
D
Rose

Answer & Explanation

Correct Option: B

Cycas is a genus of plants belonging to the gymnosperms, a group characterized by producing naked seeds that are not enclosed in an ovary or fruit. Ferns, mosses, and roses belong to distinctly different plant lineages.
Question 234 Discuss
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In which plant tissue does photosynthesis primarily occur?

A
Xylem
B
Epidermis
C
Phloem
D
Mesophyll

Answer & Explanation

Correct Option: D

The mesophyll tissue, located between the upper and lower epidermis of a leaf, contains the vast majority of the plant's chloroplasts. This high concentration makes it the primary site where photosynthesis occurs.
Question 235 Discuss
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What specialised nerve cells does the phylum Cnidaria have to capture and stun prey such as water fleas and plankton?

A
collar cell
B
stinging cell
C
flame cell
D
chief cell

Answer & Explanation

Correct Option: B

Cnidarians, like jellyfish and sea anemones, possess highly specialized explosive cells called cnidocytes (stinging cells). Upon physical contact, these cells fire a microscopic, venom-laced harpoon to rapidly paralyze and capture prey.
Question 236 Discuss
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Which of the following minerals is essential for maintaining healthy bones and teeth?

A
Sodium
B
Potassium
C
Phosphorus
D
Fluoride

Answer & Explanation

Correct Option: C

Phosphorus works synergistically with calcium to form hydroxyapatite, the primary structural mineral component of bones and tooth enamel. It provides critical compressive strength and rigidity to the skeletal system.
Question 237 Discuss
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Certain grass-eating animals complete the digestion of food in two processes. First, they swallow partially digested food and then they regurgitate and chew upon that food again. What are such animals known as?

A
Heterotrophs
B
Regurgitates
C
Autotrophs
D
Ruminants

Answer & Explanation

Correct Option: D

Ruminants, such as cows, deer, and sheep, have a specialized multi-chambered stomach. They regurgitate semi-digested food (cud) back into their mouths to chew it further, aiding significantly in the breakdown of tough plant cellulose.
Question 238 Discuss
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Which of the following is/are Pteridophyta?

A
Hornworts
B
Lichens
C
Mosses
D
Fern

Answer & Explanation

Correct Option: D

Ferns are classified as pteridophytes, which are vascular plants (possessing functional xylem and phloem) that reproduce via spores rather than seeds or flowers. They represent an evolutionary intermediate between bryophytes and seed plants.
Question 239 Discuss
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Which sulphur containing preservative is used to increase the shelf life of meat products such as fresh sausages and burgers?

A
Sodium metabisulphite
B
Sodium polysulfides
C
Sodium thiosulfate
D
Sodium phenyl sulfide

Answer & Explanation

Correct Option: A

Sodium metabisulphite is an inorganic compound commonly used as an antioxidant and antimicrobial preservative in the food industry. It inhibits oxidation and delays bacterial spoilage, thereby extending the shelf life of processed meats.
Question 240 Discuss
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Eukaryotic organisms can have very complex functions to sustain themselves. At the cellular level, these involve several different types of chemical functions like energy production, metabolism etc. What are the membranebound structures called, which are present within the cell to keep each of these functionalities separate?

A
Cytoplasm
B
Plasma gel
C
Organelles
D
Nucleoid

Answer & Explanation

Correct Option: C

Organelles are specialized, membrane-bound cellular subunits that act much like miniature organs. They compartmentalize different biochemical processes, ensuring that functions like energy production and protein synthesis occur efficiently without interference.
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