Concept:The diagram tests how plant roots respond to water.
Explanation:In the experimental setup, the porous clay pot contains water.
The plant near it shows roots bending toward the clay pot.
This bending happens because roots grow toward moisture.
The control plant in well-watered soil grows straight and erect.
Therefore, the root response is positive hydrotropism.
Hydrotropism means growth in response to water.
Answer:The correct conclusion is that roots of plants are positively hydrotropic.
So, the correct option is D.
