Advertisements
Advertisements
प्रश्न
What does a plant root do in response to water? What is this phenomenon known as?
उत्तर
A plant root always moves towards water. This phenomenon is known as positive hydrotropism.
APPEARS IN
संबंधित प्रश्न
Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.
What is meant by positive tropism and negative tropism? Explain with examples.
When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petals of a dandelion flower close.
state two ways in which the above two processes differ.
Name the part of plant which shows positive geotropism. Why?
The growth of tendrils in pea plants is due to
The opening and closing of the Moonflower is not a tropism because the movement in this is ______.
While conducting experiments to study the effects of various stimuli on the plants, it was observed that the roots of plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X however bends ” away from stimulus A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to factors related to Earth. Keeping these points in mind, answer the following questions:
- What could be stimulus A?
- Name the stimulus seen in B.
- What could be stimulus-C?
______ of sweet peas exhibit thigmotropism.
Define the following term:
Tropism
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.
