A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertical). This happens in response to

(a) water and light

(b) water and minerals

(c) gravity and water

(d) light and gravity

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Solution

(d) light and gravity

It is because a plant stem grows towards the light in the upward direction against the force of gravity.

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A big tree falls in a forest but its roots are still in contact with the soil.
The branches of this fallen tree grow straight up (vertically). This happens in response to
(a) water and light
(b) water and minerals
(c) gravity and water
(d) light and gravity

While conducting experiments to study the effect 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 stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following questions :

(a) What could stimulus A be?

(b) Name the stimulus B.

(d) The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also, name these two stimuli.

Q. Fill in the following blanks :
(a) A plant's response to light is called ..........
(b) A plant's response to gravity is called ........
(c) Plant shoot grows upward in response to ........
(d) Plant roots grow downward in response to ........
(e) Tendrils wind around a support in response to .......
(f) Plant roots grow towards........ and in the direction of force of .........
(g) A root of a plant grows downward. This is known as ........
(h) ...... is the hormone that causes phototropism in plants
(i) The response of leaves to the sunlight is called ..........

Fill in the following blanks:

(a) A plant's response to light is called .................

(b) A plant's response to gravity is called .................

(d) Plant roots grow downward in response to .............

(e) Tendrils wind around a support in response to ..........

(f) Plant roots grow towards .......... and in the direction of force of ...............

(g) A root of a plant grows downward. This is known as ..............

(h) ........... is the hormone that causes phototropism in plants

(i) The response of leaves to the sunlight is called ..............

(a) What does a root do in response to gravity? What is this phenomenon known as?

(b) What does a stem (or shoot) do in response to light? What is this phenomenon known as?

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A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertical). This happens in response to (a) water and light (b) water and minerals (c) gravity and water (d) light and gravity

(d) light and gravity It is because a plant stem grows towards the light in the upward direction against the force of gravity.

A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertical). This happens in response to

(a) water and light

(b) water and minerals

(c) gravity and water

(d) light and gravity

(d) light and gravity

It is because a plant stem grows towards the light in the upward direction against the force of gravity.