Question 35:
(a) Define geotropism. Give one example of geotropism.
(b) What is meant by ‘positive geotropism’ and ‘negative geotropism ? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.
(c) Name one plant part which exhibits positive thigmotropism.
Lakhmir Singh Biology Class 10
Answers
HI MATE,
Geotropism is the response to gravity in which different parts of a plant grow in opposite directions like a root grows downwards whereas the stem wo states are :
(B) (1) POSITIVE GEOTROPISM (growing with gravity)
(2) NEGATIVE GEOTROPISM (growing against gravity)
ex of positive geotropism :movement of roots
ex of negative geotropism : movement of stem
(c)chui-mui
(a) The growth of plant roots is a case in point of geotropism.
(b) If the orientation of the plant parts is towards the gravity pull, this is known as positive geotropism; and if the orientation of the plant parts is in the opposite direction to the gravity pull, it is known as negative geotropism.
(c) One plant's climbing or tendrils organs indicate good thigmotropism.
Explanation:
(a) In reaction to gravity the movement of plant parts is known as geotropism. The growth of plant roots is a case in point of geotropism.
(b) If the orientation of the plant parts is towards the gravity pull, this is known as positive geotropism; and if the orientation of the plant parts is in the opposite direction to the gravity pull, it is known as negative geotropism.
The motion of roots into the soil is an example of positive geotropism, while the movement of the plant is an example of negative geotropism from the soil towards the upward path.
(c) One plant's climbing or tendrils organs indicate good thigmotropism.
To know more about geotropism, visit:
Define positive geotropism and negative geotropism give one example of each?
https://brainly.in/question/2511050
Define geotropism? state its two types?
https://brainly.in/question/54005
