Advertisements
Advertisements
Question
The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity? Describe with the help of a diagram.
Solution
The response of plants to gravity can be observed in the laboratory when the seedlings are placed in a pot filled with moist soil.
Roots of plants show positive geotropism which means that they grow in the direction of gravity in the downward direction. This movement is good for the growth of the seedling. The roots need to grow downwards in the soil in search of water and minerals.
Shoots of plants show negative geotropism which means that they grow against the direction of gravity in the upward direction. This movement is beneficial for the elongation of the plant. The shoots need to grow upwards in the direction of sunlight so that the plant can grow in height.
APPEARS IN
RELATED QUESTIONS
What does a Mimosa pudica plant do in response to touch? What is this phenomenon known as?
What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case
How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.
The stimulus in the process of thigmotropism is ______.
Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:
The bending of the root of a plant away from a source of light is caused by a plant hormone called :
(a) cytokinin
(b) gibberellin
(c) abscisic acid
(d) auxin
When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petals of a dandelion flower close.
state two ways in which the above two processes differ.
Assertion: Plants do have a nervous system for control and coordination.
Reason: Plants use electrochemical means to convey information from cell to cell.
The opening and closing of the Moonflower is not a tropism because the movement in this is ______.
Name the stimulus which causes the following movement in plant:
Hydrotropism
