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प्रश्न
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.
उत्तर
- Figure A is correct, as it shows roots growing towards gravity and shoots growing away from gravity.
- The root shows positive geotropism and the shoot shows negative geotropism.
Positive geotropism is defined as the movement of a plant towards the earth's gravity. For example, roots show positive geotropism.
Negative geotropism is defined as the movement of a plant away from gravity. For example, a shoot shows negative geotropism. - The shoot system responds positively to light, while the root system responds positively to the stimulus of gravity.
- Gravity provides a more significant influence on the growth of roots, as plants require an abundance of water.
संबंधित प्रश्न
Plant parts show two types of movements, one dependent on growth and other independent of growth Give one example which depends on growth
Name the two types of tendrils.
Fill in the following blank :
...... is the hormone that causes phototropism in plants
Define thigmotropism. Give one example of thigmotropism.
There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
- Name the phenomenon shown by the flowers of (i) plant A and (ii) plant B.
- Name one flower each which behaves like the flower of (i) plant A and (ii) plant B.
- Name the phenomenon exhibited by the leaves of plant C.
- Name a plant whose leaves behave like those of plant C.
- Which plant/plants exhibit the phenomenon based on growth movements?
The top part A of the flask-shaped reproductive organ X in the flower of a plant secrets a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y i the flower falls on part A, it grows a long tube F through the organ X i response to the sugary substance and reaches the bottom part C of flask-shaped organ to carry out fertilisation.
(a) Name parts (i) organ X, and (ii) organ Y, inside the flower?
(b) Name parts (i) A (ii) B, and (iii) C, of flask-shaped organ.
(c) Name (i) grain D, and (ii) part E of organ Y.
(d) Name the tube F.
(e) What is the phenomenon of growing a long tube in response to sugary substance in the process of fertilisation in a flower known as?
In tropic movements, plant parts move
The opening and closing of the Moonflower is not a tropism because the movement in this is ______.
Give an example of negative hydrotropism.
Name the stimulus which causes the following movement in plant:
Geotropism
