Define geotropism. Draw a labelled diagram of a plant showing geotropic movements of its parts.
Define geotropism. Draw a labelled diagram of a plant showing geotropic movements of its parts.
Definition of Geotropism
Geotropism is the directional growth movement of plant parts in response to the pull of earth or gravity.
- The upward growth of shoots away from the earth is called negative geotropism.
- The downward growth of roots towards the earth is called positive geotropism.
Labelled Diagram of Geotropism
Below is the diagrammatic representation of a plant showing geotropic movements:
Marking Scheme
- 1Define geotropism as the growth of plant parts in response to gravity. (1 mark)
- 2Clearly distinguish between positive geotropism (roots growing downwards) and negative geotropism (shoots growing upwards). (1 mark)
- 3Draw a neat, correctly labelled diagram showing a horizontal plant with shoot bending up and root bending down. (1 mark)
Hint
Remember that 'geo' refers to earth/gravity. Roots go down with gravity, and shoots go up against it.
Quick Oral Answer
Geotropism is the growth of plant parts in response to gravity. Roots show positive geotropism by growing downwards, while shoots show negative geotropism by growing upwards.
Analysis & Explanation
Geotropism is a classic example of a tropic (directional) movement in plants where gravity acts as the environmental stimulus. The NCERT textbook states that roots always grow downwards (towards gravity, showing positive geotropism) to anchor the plant and absorb water/nutrients, while shoots grow upwards (away from gravity, showing negative geotropism) to reach sunlight for photosynthesis. When a potted plant is placed horizontally, the shoot bends upwards against gravity, and the root bends downwards towards gravity, demonstrating this phenomenon clearly.
Common Mistakes
- 1Confusing geotropism with phototropism.
- 2Drawing a normal vertical plant instead of a horizontal setup, which makes it harder to demonstrate the bending response to gravity clearly.
- 3Forgetting to label 'positive' and 'negative' geotropism on the diagram.
Interesting Facts
Even in outer space (microgravity), scientists study plant growth to see how roots and shoots orient themselves without a strong gravitational pull!
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2020?
This question carries 3 marks in the CBSE Class 10 Science 2020 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Control and Coordination" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Plant Movements - Geotropism" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2020 paper?
This is a Short Answer question from Section B in the CBSE Class 10 Science 2020 paper.