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प्रश्न
P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.
(a) What is (i) R, and (ii) S?
(b) What is the name of growth movement exhibited by the organs R and S?
(c) Name the stimulus involved in this case.
(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.
(e) Name one plant like P and another plant like Q.
उत्तर
(a) (i) R is a leaf tendril and (ii) S is a stem tendril.
(b) The growth movement exhibited by R and S is thigmotropism.
(c) The stimulus involved is touch or contact with other objects.
(d) The behaviour of R and S is a tropic movement.
(e) Pea plant is an example of plant type P, whereas bitter gourd plant is an example of the type Q.
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संबंधित प्रश्न
How does phototropism occur in plants?
Plant roots grow downward in response to ______.
Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.
How is movement in plants different from that in animals?
Answer the following question.
What is tropism?
Match column A with column B.
| Column A | Column B |
| Roots growing downwards into soil. | Positive phototropism |
| Shoots growing towards the light. | Negative geotropism |
| Shoots growing upward. | Negative phototropism |
| Roots growing downwards away from light. | Positive geotropism |
The stimulus in the process of thigmotropism is:
The venus flytrap plants are examples of ______.
Give the scientific term for the following:
Growth-dependent movement in plants.
Given below are the figures showing some kinds of tropic movements in plants. Study the same and answer the following questions:
- Which one of these figures is correct? Give reason in support of your answer.
- Name the kinds of movements shown by the root system and shoot system. Define each.
- What are the two stimuli which affect root system and shoot system positively? Name them.
- Which of the following stimuli affects the growth of the root strongly?
- Gravity
- Water
- Draw a neat and labelled diagram of the longitudinal section of a pistil showing chemotropism in an angiospermic plant.
