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Plant Physiology MCQ

177 MCQ questions with answers and explanations · page 6 of 8

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Q126. Ethylene is-

  1. AA gaseous metabolites
  2. BA gaseous enzyme
  3. CA gaseous harmone
  4. DA solid harmone
Show answer & explanation

Answer: C) A gaseous harmone

Q127. Auxin suppresses the growth of-

  1. ALateral axillary buds
  2. BApical buds
  3. CRoots on stem cuttings
  4. DParthenocarpy
Show answer & explanation

Answer: A) Lateral axillary buds

Q128. Gibberelling bring about-

  1. AYellowing of leaves
  2. BPromotion of rooting
  3. CElongation of genetically dwarf plants
  4. DDwarfing of genetically tall plants
Show answer & explanation

Answer: C) Elongation of genetically dwarf plants

Q129. Parthenocarpy fruit is obtained by sprying phytoharmone-

  1. AZeafin
  2. BABA
  3. CAuxins
  4. DKinetin
Show answer & explanation

Answer: C) Auxins

Q130. Dwarfness can be controlled by treating the plant with-

  1. ACytokinin
  2. BGibberellic acid
  3. CAuxin
  4. DAntigibberellin
Show answer & explanation

Answer: B) Gibberellic acid

Q131. Highest concentration of auxin occurs-

  1. AIn growing tops
  2. BIn leaves
  3. CAt the base of plant organs
  4. DIn xylem & phloem
Show answer & explanation

Answer: A) In growing tops

Q132. Harmone helping in cell division-

  1. AIAA
  2. BNAA
  3. CCytokinin/Zeatin
  4. DGibberellin
Show answer & explanation

Answer: C) Cytokinin/Zeatin

Q133. Leaf fall can be prevented with the help of-

  1. AAbcisic acid
  2. BAuxins
  3. CFlorigen
  4. DCytokinins
Show answer & explanation

Answer: D) Cytokinins

Q134. Fruit ripening is accelerated by-

  1. AWarm surroundings
  2. BIncreased nitrogen supply
  3. CReduced water supply
  4. DEthylene rich atmosphere
Show answer & explanation

Answer: D) Ethylene rich atmosphere

Q135. Auxin is a-

  1. AGrowth catylser
  2. BGrowth destroyer
  3. CGrowth harmone
  4. DGrowth inhibitor
Show answer & explanation

Answer: C) Growth harmone

Q136. Which one of following is a weedicides ?

  1. ANAA
  2. B2, 4-D
  3. CABA
  4. DG.A
Show answer & explanation

Answer: B) 2, 4-D

Q137. Indol acetic acid is-

  1. AEnzyme
  2. BFungicides
  3. CAmino acid
  4. DAuxin
Show answer & explanation

Answer: D) Auxin

Q138. Gibberellins is first separated from-

  1. AAlgae
  2. BFungi
  3. CBacteria
  4. DVirus
Show answer & explanation

Answer: B) Fungi

Q139. A Chemical believed to be involved in flowering is-

  1. AGibberellin
  2. BKinetin
  3. CFlorigen
  4. DIBA
Show answer & explanation

Answer: C) Florigen

Q140. Which one produces more ethylene-

  1. AGreen apple
  2. BGreen banana
  3. CRipening banana
  4. DFresh potato buber
Show answer & explanation

Answer: C) Ripening banana

Q141. IAA was first isolated from-

  1. ACorn germ oil
  2. BGibberella
  3. CHuman urine
  4. DRhizopus
Show answer & explanation

Answer: C) Human urine

Q142. Food is preserved at low temperature because-

  1. ABacterial attack is minimise
  2. BFor easy cooking
  3. CFor easy digestion
  4. DAll the above
Show answer & explanation

Answer: A) Bacterial attack is minimise

Q143. Fruit drop occurs when fruit has-

  1. ANo auxin as in the stem
  2. BLess auxin as compared to stem
  3. CMore auxin than the one present in the stem
  4. DAuxin concentration equal to that of stem
Show answer & explanation

Answer: D) Auxin concentration equal to that of stem

Q144. The instrument by which rate of growth of plant is measured-

  1. AHydrometer
  2. BAuxanometer
  3. COsmometer
  4. DPotometer
Show answer & explanation

Answer: B) Auxanometer

Q145. Which part of plant helps in holding the plant firmly into the soil ?

  1. ALeaves
  2. BFruit
  3. CStem
  4. DRoots
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Answer: D) Roots

Q146. Growth in plant occur-

  1. AWhole life
  2. BFor definite period
  3. CGrowth does not takes place on plant
  4. DNone of these
Show answer & explanation

Answer: A) Whole life

Q147. Growth rate of plant when plotted on the paper against time then "S" shaped curve is obtained, it is called-

  1. ASigmoid curve
  2. BRespiration curve
  3. CExcretion curve
  4. DOsmotic curve
Show answer & explanation

Answer: A) Sigmoid curve

Q148. For the growth in length of plant which of the following is not essential ?

  1. ASodium
  2. BCalcium
  3. CNitrogen
  4. DPhosphorus
Show answer & explanation

Answer: A) Sodium

Q149. Growth movement in plant due to light is called-

  1. AGeotropism
  2. BPhototropism
  3. CHydrotropism
  4. DThigmotropism
Show answer & explanation

Answer: B) Phototropism

Q150. Movement in plant induced by external stimuli-

  1. ATactic movement
  2. BNastic movement
  3. CAutonomic movement
  4. DParatonic movement
Show answer & explanation

Answer: D) Paratonic movement

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