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 31 Discuss
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Which of the following is the best definition of ecological efficiency?

A
The amount of energy utilised at different trophic levels in a food chain
B
The amount of energy stored at different trophic levels in a food chain
C
The ratio between the mass and the energy flow at different trophic levels in a food chain
D
The ratio between energy flows at different points in a food chain

Answer & Explanation

Correct Option: D

Ecological efficiency scientifically measures how effectively energy transfers from one trophic level up to the next in an ecosystem, typically averaging only about 10 percent.
Question 32 Discuss
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In the context of cell division, which chromosomal behaviour takes place at the leptotene stage?

A
Chromosomes become visible and start to condense
B
Crossing over occurs
C
Homologous chromosomes pair up
D
Chromosomes align at the equator

Answer & Explanation

Correct Option: A

During the initial leptotene stage of prophase I in meiosis, intricately replicated chromosomes begin to significantly condense and first become distinctly visible under a standard light microscope.
Question 33 Discuss
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Which of the following categories does Gonyaulax belong to?

A
Euglenoids
B
Chrysophytes
C
Protozoans
D
Dinoflagellates

Answer & Explanation

Correct Option: D

Gonyaulax is a notorious genus of toxic dinoflagellates, well-known as microscopic marine plankton profoundly responsible for triggering naturally bioluminescent but highly poisonous 'red tides.'
Question 34 Discuss
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Which of the following is NOT a member of the Aves (birds) class?

A
Psittacula
B
Neophron
C
Pteropus
D
Struthio

Answer & Explanation

Correct Option: C

Pteropus is a taxonomic genus strictly comprising megabats commonly known as flying foxes, making them highly adapted flying mammals rather than members of the avian class.
Question 35 Discuss
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In the year 1925, who extracted lipids from an erythrocyte sample and found that lipid monolayers are good for measuring molecular surface area versus lateral pressure?

A
Gorter and Grendel
B
Carson and Eccles
C
Avery and Buck
D
Margulis and Ruska

Answer & Explanation

Correct Option: A

In 1925, researchers Evert Gorter and Francois Grendel successfully deduced the foundational lipid bilayer structure of cell membranes by demonstrating that extracted lipids covered exactly twice the surface area of red blood cells.
Question 36 Discuss
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Match the points under Column A with those under Column B. Column A (Subphylum) Column B (Animal) i. Hexapoda a. Daphnia ii. Crustacea b. Mosquito iii. Myriapoda c. Limulus iv. Chelicerata d. Julus

A
i-b, ii-c, iii-a, iv-d
B
i-a, ii-b, iii-c, iv-d
C
i-d, ii-c, iii-b, iv-a
D
i-b, ii-a, iii-d, iv-c

Answer & Explanation

Correct Option: D

Taxonomically, the subphylum Hexapoda properly includes mosquitoes, Crustacea strictly includes Daphnia (water fleas), Myriapoda incorporates Julus (millipedes), and Chelicerata fundamentally includes Limulus (horseshoe crabs).
Question 37 Discuss
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Which types of gametes are found in Spirogyra?

A
Isogamous and flagellated
B
Heterogamous and non-flagellated
C
Heterogamous and flagellated
D
Isogamous and non-flagellated

Answer & Explanation

Correct Option: D

Spirogyra primarily reproduce sexually via a process called conjugation, actively utilizing morphologically identical (isogamous) gametes that lack structural flagella and move strictly via amoeboid motion.
Question 38 Discuss
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What kind of phyllotaxy was examined in the Guava plant?

A
Superimposed
B
Whorled
C
Alternate
D
Opposite

Answer & Explanation

Correct Option: D

Guava plants famously exhibit an opposite phyllotaxy, botanically meaning that two leaves consistently arise from the exact same node but on completely opposite sides of the central stem.
Question 39 Discuss
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The growth form of a plant, comprising its size, shape and orientation is known as:

A
habit
B
environment
C
habitat
D
growth pattern

Answer & Explanation

Correct Option: A

In standard botany, a plant's 'habit' fundamentally refers to its general physical appearance, structural architecture, and genetically programmed standard pattern of natural growth.
Question 40 Discuss
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What is the main sense organ that virtual reality displays are aiming for?

A
Smell
B
Taste
C
Vision
D
Touch

Answer & Explanation

Correct Option: C

Virtual reality primarily targets the visual system by explicitly employing stereoscopic displays to smoothly simulate vast depth and construct a wholly immersive optical environment.
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