Write the scientific terms used to represent the following: a) Growing of roots towards the gravity. b) Bending of roots towards the water.
Answers
Answer:
a) Growing of roots towards gravity is called positive geotropism.
b) Bending of roots towards the water is called hydrotropism.
Explanation:
Hydrotropism:
It is the growth or bending of roots towards the water. Here, the bending of roots towards water is response and water is the stimulus. The root cap starts moving towards the water as it senses water and hence the whole root of the plant starts bending towards the water. This phenomenon is of great importance for the plants as it helps them to reach towards the water.
Positive Geotropism:
The roots of the plant grow downwards towards gravity. Here, growth of roots towards gravity is the response and gravity is the stimulus.
In both the terms TROPISM means the movement of the plant towards a stimulus.
The scientific terms used to represent the following:
a) Growing of roots towards gravity.
Answer:
Positive Gravitropism.
Explanation:
The way plants respond to 'external stimuli' is termed as tropism. 'Gravitropism, also called 'Geotropism' refers to the tendency of 'differential growth in 'response to gravity'.
In plants, roots show 'positive gravitropism' and stem show 'negative gravitropism'. Positive gravitropism in roots is linked to the plant hormone called auxin. In response to 'gravitational force', auxin moves faster towards the lower side of the root causing the root to grow in the downward direction.
b) Bending of roots towards the water.
Answer:
Positive hydrotropism.
Explanation:
In positive hydrotropism, the organism will grow towards the source of water. But in negative hydrotropism, the organism will grow in a direction away from the water source. Water is a major component in the 'process of photosynthesis' where plants convert light energy into chemical energy and store it as sugars.
Plants absorb water and other water-soluble nutrients through their roots. Positive hydrotropism of roots helps plants survive drought situations by effectively sourcing water.