Roots can grow towards water and in the direction of gravity. What feature of plants does this show?
Answer and explanation
Correct answer: They show growth response to directional stimuli
The governing concept is tropism, a directional growth response to an external stimulus. Water provides hydrotropic stimulation and gravity provides geotropic stimulation. Roots grow toward water and generally downward in response to gravity, showing that plant growth can be coordinated without a nervous system. Photosynthesis, nerves and blood circulation do not explain this directional growth. Therefore option A correctly identifies the feature.
Frequently asked questions
What is the correct answer to this question?
They show growth response to directional stimuli
Why is this the correct answer?
The governing concept is tropism, a directional growth response to an external stimulus. Water provides hydrotropic stimulation and gravity provides geotropic stimulation. Roots grow toward water and generally downward in response to gravity, showing that plant growth can be coordinated without a nervous system. Photosynthesis, nerves and blood circulation do not explain this directional growth. Therefore option A correctly identifies the feature.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
