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 241 Discuss
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Which one of the following has the largest population in a food chain?

A
Secondary consumers
B
Primary consumers
C
Decomposers
D
Producers

Answer & Explanation

Correct Option: C

In terms of raw biological numbers, decomposers like microscopic bacteria and fungi have the largest population in an ecosystem. They operate constantly at every trophic level, breaking down dead organic matter and recycling nutrients.
Question 242 Discuss
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In which year did Rudolf Virchow develop his ideas by publishing his famous formula 'Omnis cellula-e cellula', which became a part of the foundation of cell theory?

A
1830
B
1855
C
1890
D
1902

Answer & Explanation

Correct Option: B

In 1855, German physician and pathologist Rudolf Virchow published his profound scientific conclusion 'Omnis cellula e cellula', translating to 'all cells come from pre-existing cells.' This concept became the third fundamental tenet of classical cell theory.
Question 243 Discuss
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Which of the following is a green alga found in vast masses of a variety of marine and fresh waters?

A
Porphyra
B
Gelidium
C
Sargassum
D
Cladophora

Answer & Explanation

Correct Option: D

Cladophora is a highly common genus of reticulated, filamentous green algae (Chlorophyta). It thrives globally in both marine and freshwater ecosystems, often forming dense, floating mats that provide micro-habitats.
Question 244 Discuss
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Planaria, a type of flatworm, is well known for its ability to reproduce asexually through which process?

A
Regeneration
B
Binary fission
C
Multiple fission
D
Fragmentation

Answer & Explanation

Correct Option: D

Fragmentation is a form of asexual reproduction where an organism physically splits into fragments, and each fragment develops into a fully mature, independent individual. Planarians exhibit an extraordinary capacity for this regenerative process.
Question 245 Discuss
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Which organelle contains enzymes that help break down fatty acids and detoxify certain compounds in the cell?

A
Peroxisome
B
Vacuole
C
Lysosome
D
Centriole

Answer & Explanation

Correct Option: A

Peroxisomes are small, membrane-bound organelles rich in oxidative enzymes. They play a critical cellular role in lipid metabolism, particularly the breakdown of very long chain fatty acids, and the detoxification of harmful substances like hydrogen peroxide.
Question 246 Discuss
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Spiders, scorpions, and horseshoe crabs belong to which subphylum of arthropods?

A
Chelicerata
B
Myriapoda
C
Hexapoda
D
Crustacea

Answer & Explanation

Correct Option: A

Chelicerata is a major subphylum of arthropods structurally characterized by having two body segments and claw-like feeding appendages called chelicerae. This diverse group includes arachnids, horseshoe crabs, and sea spiders.
Question 247 Discuss
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Which of the following statements regarding the role of Carbonic Anhydrase in the human body is correct

A
It is primarily found in blood plasma to transport oxygen
B
It catalyzes the interconversion of dissolved bicarbonates and carbon dioxide
C
It is an enzyme that strictly functions in the acidic environment of the stomach
D
It prevents the formation of carbaminohemoglobin in RBCs

Answer & Explanation

Correct Option: B

Carbonic anhydrase in RBCs rapidly converts CO2 and water into bicarbonate and protons, facilitating CO2 transport.
Question 248 Discuss
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In the context of plant physiology what is the primary cause of Guttation

A
High rate of transpiration and low root pressure
B
Low rate of transpiration and high root pressure
C
Excessive sunlight causing cellular leakage
D
The closure of stomata during the peak afternoon hours

Answer & Explanation

Correct Option: B

Guttation occurs through hydathodes when root pressure is high and transpiration is low, usually at night or early morning.
Question 249 Discuss
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Which among the following correctly explains why people with O negative blood are considered universal donors

A
Their RBCs lack both A and B antigens and the Rh factor
B
Their plasma lacks antibodies against A and B antigens
C
They possess both A and B antigens on the surface of their erythrocytes
D
The Rh factor in their blood neutralizes any recipient antibodies

Answer & Explanation

Correct Option: A

O negative blood has no A, B, or Rh antigens, so it does not trigger an immune response in the recipient.
Question 250 Discuss
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Consider the following statements regarding Mitochondria and select the incorrect one

A
They are the site of aerobic respiration and ATP production
B
They possess their own circular DNA and ribosomes
C
The inner membrane is folded into cristae to increase surface area
D
They are inherited exclusively from the paternal side in humans

Answer & Explanation

Correct Option: D

Mitochondria are inherited maternally because the egg cell provides the cytoplasm and organelles to the zygote.
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