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Plant Physiology MCQ

177 MCQ questions with answers and explanations · page 1 of 8

Test yourself▶ 25 question test▶ 50 question test

Q1. Osmosis Involves-

  1. ADiffusion of suspended particle from higher to lower Concentration.
  2. BDiffusion of suspended particle from lower to higher concentration.
  3. CDiffusion of water from more to less concentrated side.
  4. DDiffusion of water from less to more concentrated side.
Show answer & explanation

Answer: D) Diffusion of water from less to more concentrated side.

Q2. Transpiration in plants is a process of-

  1. APhotorespiration
  2. BWater loss
  3. CFood production
  4. DRespiration
Show answer & explanation

Answer: B) Water loss

Q3. In soil, water that is readily available to plant roots is :

  1. Agravitational water
  2. Bcapillary water
  3. Chygroscopic water
  4. Dbound water
Show answer & explanation

Answer: B) capillary water

Q4. In which of the following part of the cell as the pyruvic acid is broken down into carbon dioxide, water and energy ?

  1. ACytoplasm
  2. BNucleus
  3. CMitochondria
  4. DChloroplast
Show answer & explanation

Answer: C) Mitochondria

Q5. Vaseline was applied to both surfaces of the leaves of a plant. Which of the following process/processes would be affected ?n1. Photosynthesis 2. Rspiration 3. TranspirationnSelect the correct answer using the code given below :

  1. A1 and 3 only
  2. B2 only
  3. C2 and 3 only
  4. D1, 2 and 3
Show answer & explanation

Answer: D) 1, 2 and 3

Q6. A cell placed in strong salt solution will shrink because

  1. ACytoplasm will decompose.
  2. BMineral salt will break the cell wall.
  3. CSalt water enters the cell.
  4. DWater comes out from cell by exosmosis.
Show answer & explanation

Answer: D) Water comes out from cell by exosmosis.

Q7. A cell shrink when it is placed in-

  1. AHypertonic solution
  2. BHypotonic solution
  3. CIsotonic solution
  4. DSaturated solution
Show answer & explanation

Answer: A) Hypertonic solution

Q8. A cell increases in volume if the external medium is-

  1. AHypotonic
  2. BHypertonic
  3. CIsotonic
  4. DNone of these
Show answer & explanation

Answer: A) Hypotonic

Q9. Which one of the following elements is present in green pigment of leaf ?

  1. AMagnesium
  2. BPhosphorus
  3. CIron
  4. DCalcium
Show answer & explanation

Answer: A) Magnesium

Q10. Which of the following structures of a plant responsible for transpiration ?

  1. AXylem
  2. BRoot
  3. CStomata
  4. DBark
Show answer & explanation

Answer: C) Stomata

Q11. During rainy seasons door made up of wood swell up due to-

  1. ADiffusion
  2. BOsmosis
  3. CImbibition
  4. DPlasmolysis
Show answer & explanation

Answer: C) Imbibition

Q12. Excessive supply of chemical fertilizer often causes death of crop plant due to-

  1. AExosmosis
  2. BEndosmosis
  3. CImbibition
  4. DTurgidity
Show answer & explanation

Answer: A) Exosmosis

Q13. In Plant water is transported through-

  1. ACambium
  2. BPhloem
  3. CXylem
  4. DEpidermis
Show answer & explanation

Answer: C) Xylem

Q14. Water avilable in soil for the root of Plant is-

  1. ACapillary Water
  2. BGravitational Water
  3. CHygroscopic Water
  4. DNone of these
Show answer & explanation

Answer: A) Capillary Water

Q15. When concentration of solutes is low in the soil, absorption of water is-

  1. AStopped
  2. BIncrease
  3. CRetarded
  4. DRemains Normal
Show answer & explanation

Answer: B) Increase

Q16. Plant cell kept in hypertonic solution will get-

  1. ALysed
  2. BTurgid
  3. CDeplasmolysed
  4. DPlasmolysed
Show answer & explanation

Answer: D) Plasmolysed

Q17. The green pigment found in plants that perform photosynthesis is-

  1. AChlorophyll
  2. BChloroplast
  3. CChloroform
  4. DNone of these
Show answer & explanation

Answer: A) Chlorophyll

Q18. Which one of the following is the example of subsistence farming ?

  1. AShifting cultivation
  2. BCommercial farming
  3. CExtensive and intensive farming
  4. DOrganic farming
Show answer & explanation

Answer: D) Organic farming

Q19. Willting of plants occurs due to excessive :

  1. AAbsorption
  2. BTranspiration
  3. CRespiration
  4. DGuttation
Show answer & explanation

Answer: B) Transpiration

Q20. The process in which loss of water occurs in the form of water vapour through aerial part of plant is-

  1. ARespiration
  2. BGuttation
  3. CTranspiration
  4. DExosmosis
Show answer & explanation

Answer: C) Transpiration

Q21. The maximum loss of water in transpiration is from-

  1. ALenticels
  2. BCuticle
  3. CStomata
  4. DHydathodes
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Answer: C) Stomata

Q22. Transpiration is high under-

  1. ADry environment
  2. BLow atmospheric pressure
  3. CHigh Temperature
  4. DAll of above.
Show answer & explanation

Answer: D) All of above.

Q23. The loss of water in the form of water drops is called-

  1. ATranspiration
  2. BRespiration
  3. CGuttation
  4. DExosmosis
Show answer & explanation

Answer: C) Guttation

Q24. Transpiration help in-

  1. ATranspiration of minerals
  2. BAscent of sap
  3. CCooling
  4. DAll of these
Show answer & explanation

Answer: D) All of these

Q25. Minute pore found on the soft aerial part of plant especially the leaves are called-

  1. ACuticles
  2. BStomata
  3. CLenticel
  4. DNone of these
Show answer & explanation

Answer: B) Stomata

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