Design an experiment to demonstrate hydrotropism.
The orientation of plant part in response to water is called hydrotropism.
Activity to demonstrate hydrotropism:
Two glass troughs A and B were taken. Both the troughs were filled with soil upto two-third level. A tiny seedling was placed in both the troughs. A small clay pot with soil was placed in trough B. In trough A water was added uniformly to the soil but in trough B water was put only in small clay pot.
Observations: After few days it was noticed that in trough A roots of the seedlings had grown straight as water is added uniformly to the soil. But in trough B roots of seedling had grown in the direction towards the clay pot because water is contained in the clay pot. This shows that roots of plant shows its growth in the direction of water.
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Name the plant part
a) Which bends in the direction of gravity but away from the light.
b) Which bends towards light but away from the force of gravity.Tamilnadu Board Science
Design an experiment to demonstrate hydrotropism.Tamilnadu Board Science
A potted plant is kept horizontally for a considerable time. The three positions of the part A and B of the potted plant are shown in the following figures.
(i) Potted plant with shoot and root growing downward. (Diagram to be drawn)
(iii) Potted plant with shoot and root growing upward (Diagram to be drawn)
a) Which figure shows the correct position taken by the parts A and B of the plant?
b) What type of phenomenon is exhibited by the figure by (A) in the figure (ii)?Tamilnadu Board Science
Complete the following table with the different types of tropism:
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Give an example for negative hydrotropism.Tamilnadu Board Science
Name the part of plant which shows positive geotropism. Why?Tamilnadu Board Science
Study the pictures below and then complete the table by putting a plus (+) if the shoot or root grows towards the stimulus and a minus (-) if it grows away from it.
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Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.
Reason (R) : Stem shows positive geotropismTamilnadu Board Science
While conducting experiments to study the effects of various stimuli on the plants, it was observed that the roots of a 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 with Earth. Keeping these points in mind, answer the following questions:
a) What could be stimulus A ?
b) Name the stimulus seen in B.
c) What could be stimulus C ?Tamilnadu Board Science
The plant part which exhibits negative geotropism is __________.Tamilnadu Board Science