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Explanation:
a) Negative phototropism occurs in the roots of the plant as you can see they are moving against the light and leaves are positively phototropic
b) Auxins, gibberellin, etc , any one
c) They show the tropic movement related to touch like the touch me not plant
d) the stem shows positive tropic movement
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1.root shows negative phototropism. This phenomenon is due to the plant hormone, called auxin.
When light falls on the side of the plant, the auxin hormone shifts towards the other side, which is away from the light. Thus auxin causes growth is the length of the cells in the shady part.
2.Phototropism in shoots is attributed to or phototropic movements are due to Auxin is a plant hormone that plays important role in phototropism, growth movement in response to light. It promotes cell elongation. It is unequally distributed in the plant cells. It is transported towards the shady side and thus present in higher concentration. However, less auxin is transported towards the side exposed to light. Due to this, the plant grows more on the shaded side and bend in the direction of the light source. It shows positive phototropism where faster cell elongation is seen on the shaded side and less on the illuminated side.
3. The movement of plant part in response to contact with a solid touch is called as thigmotropism. The twining movements due to support seen in tendrils and twiners is an example of thigmotropism. Seismonasty is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. Heliotropism is a growth movement or bending of stem in the direction of the light. It is also called as solar tracking. Diageotropism is plant part response to the gravity such that it grows horizontal to the gravity.
4. If the stem grows towards the sunlight, it is called as positively phototropic movement. It is a tropic movement induced in the plant, in response to the stimuli called as light. Whereas, the growth of root is negatively phototropic.
When light falls on the side of the plant, the auxin hormone shifts towards the other side, which is away from the light. Thus auxin causes growth is the length of the cells in the shady part.
2.Phototropism in shoots is attributed to or phototropic movements are due to Auxin is a plant hormone that plays important role in phototropism, growth movement in response to light. It promotes cell elongation. It is unequally distributed in the plant cells. It is transported towards the shady side and thus present in higher concentration. However, less auxin is transported towards the side exposed to light. Due to this, the plant grows more on the shaded side and bend in the direction of the light source. It shows positive phototropism where faster cell elongation is seen on the shaded side and less on the illuminated side.
3. The movement of plant part in response to contact with a solid touch is called as thigmotropism. The twining movements due to support seen in tendrils and twiners is an example of thigmotropism. Seismonasty is the nastic response of a plant to touch or vibration. Dropping of leaves of Mimosa pudica upon touching is due to seismonasty. Heliotropism is a growth movement or bending of stem in the direction of the light. It is also called as solar tracking. Diageotropism is plant part response to the gravity such that it grows horizontal to the gravity.
4. If the stem grows towards the sunlight, it is called as positively phototropic movement. It is a tropic movement induced in the plant, in response to the stimuli called as light. Whereas, the growth of root is negatively phototropic.
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