Plant Responses to Stimuli
Biology ⇒ Plant Biology
Plant Responses to Stimuli starts at 8 and continues till grade 12.
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See sample questions for grade 8
Describe how a climbing plant uses thigmotropism to support itself.
Describe how abscisic acid helps plants survive during drought.
Describe what happens to a plant shoot when it is placed near a window with sunlight coming from one side.
Explain why leaves of some plants fold up at night.
Explain why roots grow downwards even if a seed is planted upside down.
Explain why some desert plants open their stomata only at night.
What is the difference between positive and negative tropism?
What is the function of gibberellins in plants?
What is the main difference between tropic and nastic movements in plants?
What is the main role of ethylene in plants?
What is the term for a plant's movement in response to light?
A scientist places a potted plant in a dark room with a single light source coming from the left side. After several days, the plant's stem bends towards the light. Explain the role of auxin in this process and why the stem bends towards the light.
A student observes that the leaves of a certain plant close quickly when the temperature drops suddenly at night. What type of plant response is this, and what might be its adaptive advantage?
A Venus flytrap closes its leaves rapidly when an insect touches its trigger hairs. Is this response considered a tropic or nastic movement? Explain your answer.
Explain why the roots of a plant show positive geotropism while the shoots show negative geotropism. Include the role of gravity in your answer.
