Geotropism
Trending Questions
(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 lablled 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.
What are the different stages of plant growth?
Define geotropism. Draw a labelled diagram of a plant showing geotropic movements of its parts?
What is geotropism?
Stems are :
(a) positively geotropic and negatively phototropic
(b) positively geotropic and positively phototropic
(c) negatively geotropic and positively phototropic
(d) negatively phototropicand positively geotropic
The response of plants to gravity is known as geotropism. How are plant parts sensitive to gravity ? Describe with the help of a diagram.
Fruit drop is prevented by spraying
Cytokinin
Gibberellin
Ethylene
Auxin
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
Cell growth in animals is more uniform as compared to plants.
False
True
Which fruit has the most ethylene gas?
- +ve geotropism
- -ve phototropism
- -ve geotropism
The root of a plant is :
(i) positively phototropic but negatively geotropic
(ii) positively geotropic but negatively phototropic
(iii) negatively phototropic but positively hydrotropic
(iv) negatively hydrotropic but positively phototropic
The movement of a plant part in response to the force of attraction exerted by the earth is called:
(a) hydrotropism
(b) geotropism
(c) chemotropism
(d) phototropism
(a) A plant’s response to light is called
(a)Define geotropism. Give one example of geotropism.
The plant part which exhibits negative geotropism is:
(a) root
(b) stem
(c) branch
(d) leaves
A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:
(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 chosen in (A) above?
- Negative Phototropism
- Positive Phototropism
- Negative Geotropism
- Positive Geotropism
What is this phenomenon known as?
(f) Plant roots grow towards
(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?
A potted plant having straight parts A and B were placed horizontally on its side as shown in Figure (i). After a few days, it was observed that the parts A and B of the plant acquire new positions as shown in Figure (ii).
(a) Name the phenomenon exhibited by the position of plant parts A and B in Figure (ii).
(b) Name the stimulus (other than sunlight) which causes plant parts A to grow and bend upwards, and plant part B to bend downwards.
geotropism
chemotropism
phototropism
hydrotropism
(a)What does a stem (or shoot) do in response to gravity? What is this phenomenon known as?
Name the plant organs which are:
(c) negatively geotropic
Observe the picture. It depicts mangroves of Sunderbans and the numerous roots surrounding the main tree. Into which kind of tropic movement can this be categorized into?
Positive geotropism
Negative geotropism
Negative hydrotropism
Both B & C
- Positive Phototropism
- Negative Phototropism
- Negative Geotropism
- Positive Geotropism
Name the plant organs which are:
(b) positively geotropic- Auxin
- Abscisic acid
- Thyroxine
- Gibberellin
