Free & Premium Study Material · Online Courses · Instant Download+91 99398 78821 · support@downloadstore.in
downloadstoreSTUDY MATERIAL
LoginRegister🛒0

Plant Physiology MCQ

177 MCQ questions with answers and explanations · page 2 of 8

Test yourself▶ 25 question test▶ 50 question test

Q26. The percentage of water lost during transpiration is-

  1. A0.8
  2. B0.6
  3. C0.99
  4. D0.4
Show answer & explanation

Answer: C) 0.99

Q27. Transpiration is regulated by movement of-

  1. AGuard Cells
  2. BSubsidiary Cell
  3. CEpidermal Cell
  4. DMesophyll Cells
Show answer & explanation

Answer: A) Guard Cells

Q28. Transpiration differ from evaporation in-

  1. ARate of water loss
  2. BTranspiration is a physiological process while evaporation is physical process.
  3. CTranspiration is physical process while evaporation is a physiological process.
  4. DFrequency of water loss.
Show answer & explanation

Answer: B) Transpiration is a physiological process while evaporation is physical process.

Q29. Water movement against gravity is caused by-

  1. AImbibition
  2. BTranspiration
  3. COsmosis
  4. DDiffusion
Show answer & explanation

Answer: B) Transpiration

Q30. Stomata Generally open during-

  1. ADay time
  2. BDuring night
  3. CNot open
  4. DNone of these
Show answer & explanation

Answer: A) Day time

Q31. Plant cooling occurs due to-

  1. AAssimilation
  2. BGuttation
  3. CPhotorespration
  4. DTranspiration
Show answer & explanation

Answer: D) Transpiration

Q32. Water exadation through hydathodes is-

  1. AGuttation
  2. BTranspiration
  3. CHydrolysis
  4. DExcretion
Show answer & explanation

Answer: A) Guttation

Q33. Hydathodes occur on-

  1. AStem
  2. BLeaves
  3. CRoot
  4. DAll of these
Show answer & explanation

Answer: B) Leaves

Q34. Maximum transpiration occur in-

  1. AAlgal cells
  2. BXerophytic plants
  3. CHydrophytic plants
  4. DMesophytic plants
Show answer & explanation

Answer: D) Mesophytic plants

Q35. A twing kept in water having some salt remain fresh for longer period due to-

  1. ADecrease in bacterial degradation
  2. BExosmosis
  3. CDecrease in transpiration rate
  4. DAbsorption of more water
Show answer & explanation

Answer: C) Decrease in transpiration rate

Q36. An instrument for measuring the rate of transpiration :

  1. APorometer
  2. BHygrometer
  3. CPotometer
  4. DPsychrometer
Show answer & explanation

Answer: C) Potometer

Q37. In plant process of transpiration occur through-

  1. AStem
  2. BLeaves
  3. CRoot
  4. DAll the aerial part of plant
Show answer & explanation

Answer: D) All the aerial part of plant

Q38. Condition in which rate of transpiration increases-

  1. ALow velocity of wing
  2. BLow Humidity and high temperature
  3. CHigh humidity
  4. DExcess amount of water in soil
Show answer & explanation

Answer: B) Low Humidity and high temperature

Q39. Two main function of leaves are-

  1. ATranspiration & Respiration
  2. BRespiration and respiration
  3. CPhotosynthesis and respiration
  4. DPhotosynthesis and transpiration
Show answer & explanation

Answer: D) Photosynthesis and transpiration

Q40. Absorption of water by root occure in the region of-

  1. ARoot cap
  2. BCell elongation
  3. CRoot hairs
  4. DCell division
Show answer & explanation

Answer: C) Root hairs

Q41. The maximum fixation of solar energy is done by-

  1. ABacteria
  2. BProtozoa
  3. CFungi
  4. DGreen plants
Show answer & explanation

Answer: D) Green plants

Q42. Nitrification is the biological process of converting-

  1. AN2 into nitrate
  2. BN2 into nitrite
  3. CAmmonia into nitrate
  4. DAmmonia into N2
Show answer & explanation

Answer: C) Ammonia into nitrate

Q43. Which one of the following plants produces seed but not fruit ?

  1. AAlmond
  2. BCycus
  3. CGround nut
  4. DMustrad
Show answer & explanation

Answer: B) Cycus

Q44. The elements known as primary nutrients for plants

  1. ANitrogen, Phosphorus and Potassium
  2. BNitrogen, Oxygen and Silicon
  3. CPotassium, Boron and Nitrogen
  4. DNitrogen, Phosphorus and Iron
Show answer & explanation

Answer: A) Nitrogen, Phosphorus and Potassium

Q45. Which of the following plays an important role in photosynthesis ?

  1. AChloroplast
  2. BCentrosome
  3. CTonoplast
  4. DNematoblast
Show answer & explanation

Answer: A) Chloroplast

Q46. The most accepted theory for ascent of sap was given by-

  1. ASachs
  2. BBose
  3. CDixon and Joly
  4. DStrasburger
Show answer & explanation

Answer: C) Dixon and Joly

Q47. Coversion of starch to sugar is essential for-

  1. AStomatal opening
  2. BStomatal closing
  3. CStomatal formation
  4. DStomatal growth
Show answer & explanation

Answer: A) Stomatal opening

Q48. The oxygen liberated during photosynthesis comes from

  1. AWater
  2. BCarbon dioxide
  3. CGlucose
  4. DChlorophyll
Show answer & explanation

Answer: A) Water

Q49. The process of taking in CO2 by plant and releasing O2 is component of-

  1. ATranspiration
  2. BRespiration
  3. CEndosmosis
  4. DPhotosynthesis
Show answer & explanation

Answer: D) Photosynthesis

Q50. Dwarf plants can be made taller by applying-

  1. AGibberellins
  2. BAuxins
  3. CCytokinins
  4. DDormin
Show answer & explanation

Answer: B) Auxins

1234…8
← Plant Disease MCQPlant Tissue MCQ →
💬