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प्रश्न
Name the type of chemical substances that control the growth in plants.
उत्तर
Plant hormones are the chemical substances that control growth in plants. Auxin, gibberelins, cytokinins and abscisic acid are examples of plant hormones.
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संबंधित प्रश्न
What is the stimulus in geotropism?
Give the scientific terms used to represent the Growing of roots towards the earth.
What is a tendril?
Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.
The movement of a plant part in response to the force of attraction exerted by the earth is called :
(a) hydrotropism
(b) geotropism
(c) chemotropism
(d) phototropism
The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of :
(a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism
To which of the following directional stimulus roots of a plant do not respond?
Give the scientific term for the following:
Growth-dependent movement in plants.
The diagram given alongside shows a type of tropism. Study the same and answer the questions that follow:
- Name and define the type of tropism shown in the diagram.
- Label the guidelines (1) to (4).
- Name two effective stimulants that help in the growth of part (2).
- Name two groups of plants where part (2) grows towards gametophyte with the help of the stimulants mentioned in (c).
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.
