Correct Option
The correct option is
A is true but R is false
.Explanation
Respiration in plants differs significantly from animals. Unlike animals, which often possess specialized respiratory organs (like lungs or gills) and circulatory systems to transport gases, plants rely on direct diffusion for gas exchange. Their metabolic demands and structural organization dictate how gases are managed.
Statement-wise Analysis
- Assertion (A): Correct
Plants do not present great demands for gas exchange compared to animals. This is because plants are stationary and have lower metabolic rates than active, mobile animals. Furthermore, during photosynthesis, large volumes of oxygen are released within the leaves, reducing the need to acquire oxygen from the external environment for respiration.
- Reason (R): Incorrect
While it is true that each plant part (root, stem, leaf) takes care of its own gas-exchange needs, the conclusion drawn in the statement is factually wrong. Because each part handles its own exchange independently, there is very little transport of gases from one plant part to another. In contrast, animals require massive transport of gases (via blood) because deep tissues cannot exchange gases directly with the atmosphere. The statement incorrectly claims that this independence results in "massive transport," whereas it actually eliminates the need for it.
Key Takeaway: Plants lack a specialized respiratory system for gas transport. Each plant part manages its own gas exchange via diffusion, resulting in minimal transport of gases between different parts of the plant.