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Plant Growth and Development BIOLOGY - Plant Growth and Development

Gujarat Board (GSEB) - STD 11 Science - BIOLOGY (GSEB - English Medium). 383 questions in this chapter.

Question types

Plant Growth and Development question types

383 questions across 5 question groups — pick any mix to generate a BIOLOGY paper with step-by-step answer keys.

383
Questions
5
Question groups
5
Question types
Sample Questions

Plant Growth and Development questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 3M.C.Q (1 Marks)1 Mark
Apical dominance in plants is caused by.
  • ✓
    High concentration of auxins in the terminal bud.
  • B
    High concentration of gibberellins in the apical bud.
  • C
    High concentration of auxins in the lateral bud.
  • D
    Absence of auxins and gibberellins in apical bud.

Answer: A.

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Q 4M.C.Q (1 Marks)1 Mark
In short$-$day plants, flowering is induced by.
  • A
    Photoperiod less than $12\ \text{hr}.$
  • ✓
    Photoperiod below a critical length and uninterrupted long night.
  • C
    Long night.
  • D
    Short photoperiod and interrupted long night.

Answer: B.

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Q 183 Marks Question3 Marks
Many discoveries in science have been accidental. This is true for plant hormones also. Can you justify this statement by giving an example? Also what term is used for such accidental findings?
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Q 203 Marks Question3 Marks
Arun visited his village in vacations to see his grandfather. He went to the field one day along with his grandfather where he observed the poor growth of the sugarcane. He discussed the issue and the reason behind this with his grandfather. Sugarcane is the main crop in their village. His grandfather asked him to suggest some methods in order to increase the yield of sugarcane, in a healthy way. Being a biology student Arun told his grandfather to use gibberellins ($\mathrm{GA}_3$) spray on the sugarcane crop.
  1. What are gibberellins?
  2. What are other physiological responses influenced by gibberellins? Give arty two.
  3. What message is conveyed by grandfather and Arun's character?
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Q 225 Marks Questions5 Marks
What would be expected to happen if:
  1. $\mathrm{GA}_3$ is applied to rice seedlings
  2. dividing cells stop differentiating
  3. a rotten fruit gets mixed with unripe fruits
  4. you forget to add cytokinin to the culture medium.
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Q 245 Marks Questions5 Marks
Which one of the plant growth regulators would you use if you are asked to:
  1. induce rooting in a twig
  2. quickly ripen a fruit
  3. delay leaf senescence
  4. induce growth in axillary buds
  5. ‘bolt’ a rosette plant
  6. induce immediate stomatal closure in leaves.
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Q 255 Marks Questions5 Marks
List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
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