Assertion (A) : Short stunted trees and grasses form the grasslands.
Reason (R) : Amount of moisture regulates the sizes of trees and their density.
Choose the correct option.
- AOption (a)
Both (A) and (R) are true and (R) is the correct explanation of (A).
- BOption (b)
Both (A) and (R) are true but (R) is not the correct explanation of (A).
- COption (c)
(A) is true but (R) is false.
- DOption (d)
Both (A) and (R) are false.
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Correct answer
Both (A) and (R) are true and (R) is the correct explanation of (A).
Why this answer is correct
The correct answer is Both (A) and (R) are true and (R) is the correct explanation of (A).
Key PointsAssertion (A): Short stunted trees and grasses form the grasslands. - True
- Grasslands are characterized by a dominance of grasses and the presence of short, stunted trees.
- The vegetation in grasslands is adapted to various factors such as soil, climate, and disturbances like grazing or fires. Grasslands can be found in various forms, such as savannas, prairies, and steppes, depending on the specific combination of these factors in a particular region.
Reason (R): Amount of moisture regulates the sizes of trees and their density. - True
Moisture availability is one of the critical factors that influence the size of trees and their density in a given ecosystem.
- Regions with more moisture, like rainforests or wetter parts of the savannas, tend to have taller and denser trees. The abundant moisture supports rapid growth, allowing trees to reach greater heights and form a dense canopy.
- Areas with less moisture, like semi-arid or arid grasslands, have fewer and shorter trees. The limited moisture restricts the growth of trees, leading to a sparser vegetation pattern. In these regions, grasses tend to be the dominant form of vegetation because they can better adapt to the limited water availability.
- While both the assertion and reason are true, the reason is not the sole explanation for the assertion.
- Other factors, such as soil type, fire frequency, and grazing pressure, also contribute to the formation of grasslands and the presence of short, stunted trees.
- For example, frequent fires can limit tree growth and help maintain grass dominance in some grassland ecosystems, even if moisture is not the limiting factor.