Plant Growth Quiz - CBSE Class 12 Biology

Free practice quiz: Plant Growth (CBSE Class 12 Biology). 10 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Biology practice quiz has 10 multiple-choice questions on Plant Growth, and 10 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is NOT a phase of plant growth?

   1. Cell division
   2. Cell enlargement
   3. Cell differentiation
   4. Cell respiration
   Show answer

   Answer: D. Cell respiration

   Cell respiration is a metabolic process, not a phase of plant growth. The three phases of plant growth are cell division, cell enlargement, and cell differentiation.

2. Define the term 'determinate growth' in plants.

   1. Growth that continues indefinitely
   2. Growth that stops after a certain stage
   3. Growth that is influenced by light
   4. Growth that is independent of hormones
   Show answer

   Answer: B. Growth that stops after a certain stage

   Determinate growth refers to growth that ceases after reaching a certain size or stage of development.

3. How does auxin contribute to apical dominance?

   1. Auxin promotes lateral bud growth
   2. Auxin inhibits apical bud growth
   3. Auxin has no effect on bud growth
   4. Auxin promotes apical bud growth and inhibits lateral bud growth
   Show answer

   Answer: D. Auxin promotes apical bud growth and inhibits lateral bud growth

   Auxin, produced in the apical bud, promotes its own growth and inhibits the growth of lateral buds.

4. Describe the effect of gibberellins on stem elongation and fruit development.

   1. Inhibits both stem elongation and fruit development
   2. Promotes stem elongation but inhibits fruit development
   3. Promotes both stem elongation and fruit development
   4. Inhibits stem elongation but promotes fruit development
   Show answer

   Answer: C. Promotes both stem elongation and fruit development

   Gibberellins stimulate both stem elongation and fruit development.

5. Discuss the complex interplay between different plant hormones in regulating growth and development.

   1. Plant hormones act independently
   2. Hormones rarely interact
   3. Hormones often act antagonistically or synergistically
   4. Hormones always act synergistically
   Show answer

   Answer: C. Hormones often act antagonistically or synergistically

   Plant hormones rarely act in isolation; their effects are often modified by the presence or absence of other hormones, leading to synergistic or antagonistic interactions.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the primary growth hormone responsible for cell elongation in plants?
2. Explain the concept of apical dominance in plant growth.
3. What is the role of cytokinins in plant growth?
4. Explain the phenomenon of senescence in plants and its hormonal regulation.
5. Design an experiment to investigate the effect of a specific plant hormone on root growth, considering confounding variables and experimental controls.

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