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Plant Biology: 


Plants are eukaryotic cells and have a vascular system and have two major systems that are shoot system and root system. Plants show osmoregulation, nastic movements, transpiration, respiration, photosynthesis. The life cycle shows gametophytic and sporophytic generation with the primary and secondary cell walls.


Plant Biology Sample Questions:


Question 1: What is the nature of the plasma membrane of a plant cell?


1) Semipermeable 

2) Selectively permeable

3) None of above

4) Both 1 and 2.


Answer: 2) 

Explanation: The plasma membrane is selectively permeable



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Question 2: What is the function of aquaporin?


1) Transport proteins are involved in water transport.

2) Involved in phosphorylation

3) involve in the regulation of ions transport.

4) All of the above.

Answer:  1) 

Explanation: Aquaporins are water-filled channels



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Question 3: How the movement of water is affected by the Casparian strips present in the endodermis layer of plant cells.


1) Apoplastic movement
2) Symplastic movement
3) Apoplastic to symplastic movement
4) Symplastic to apoplastic movement

Answer: 3)

Explanation: The symplastic movement is the movement of water through the cells means via cytoplasm and apoplastic



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Question 4:  The upward movement of water and minerals from roots to the top of the plant against gravitational force is called?


1) Diffusion
2) Bulk flow
3) Ascent of sap 
4) Both 1 and 2

Answer: 3)

Explanation: Plants do not have a heart like animals for the transport of various substances from soil to leaves instead



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Question 5: What percentage of stomata contribute to the transpiration rate? 


1) 5-10%
2) 7-8%
3) 15-20%
4) 90%


Answer: 4)

Explanation: Stomata contribute to the highest % of water



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Question 6: How do you define the process of guttation?


1) It is the result of heavy rainfall.
2) The removal of water from plants in pure form.
3) Process of formation of water vapor from the water present in leaves
4) Water comes out in the form of water droplets.

Answer: 4)

Explanation: Guttation is the removal of xylem sap in the form of water droplets from the tips



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Question 7: Describe the process of Anammox?


1) Conversion of ammonium ions into nitrate.
2) Conversion of nitrite and ammonium ions into nitrogen gas.
3) Conversion of nitrate to ammonium ions.
4) Conversion of nitrate and nitrite to ammonia.


Answer: 2)

Explanation: Anammox is the bacterial process



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Question 8: How much ATP is required for the reduction of one molecule of nitrogen?

1) 12 ATP
2) 8 ATP
3) 16 ATP
4) 14 ATP


Answer: 3)

Explanation: 16 ATP are required for the reduction of 1 molecule of nitrogen and this process



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Question 9: What is the function of leghaemoglobin in rhizobium bacteria?


1) Maintain high oxygen concentration.
2) Maintain high carbon dioxide concentration.
3) Maintain low oxygen concentration.
4) None of the above.

Answer: 3)

Explanation: Lehaemoglobin is the homolog of hemoglobin that



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Question 10: What is the direction of movement of solutes in the phloem?


1) Unidirectional
2) Upward
3) Downward
4) Bidirectional 


Answer: 4)

Explanation:  The movement of solutes in phloem is bidirectional always means both



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