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प्रश्न
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).
उत्तर
- Chemotropism: Chemotropism is the phenomenon of the growth of plant organs in response to chemicals.
-
- Pollen grain
- Pollen tube
- Ovule
- Ovary
- Sugars and peptones.
- Gymnosperms and angiosperms.
संबंधित प्रश्न
What does a tendril do in response to the touch of a support? What is this phenomenon known as?
Name the plant organ which is positively phototropic.
The growth of tendrils in pea plants is due to the :
(a) effect of sunlight on the tendril cells facing the sun
(b) effect of gravity on the part of tendril hanging down towards the earth
(c) rapid cell division and elongation in tendril cells that are away from the support
(d) rapid cell division and elongation in tendril cells in contact with the support
Assertion: Plants do have a nervous system for control and coordination.
Reason: Plants use electrochemical means to convey information from cell to cell.
The movement of shoot towards light is
When the leaves of a sensitive plant are touched with a finger, they fold up, and when the light fades at dusk the petals of a sunflower. These two plants show ______ and ______ movements.
Plants exchange gases ______ continuously through these stomata.
When the leaves of the Mimosa pudica plant are touched with a finger, they fold up quickly.
Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R): Stem shows positive geotropism.
Give an example of negative hydrotropism.
