With reference to trees found in mountain regions, consider the following statements: 1. They typically have a broad, flat canopy like plains trees. 2. They have sloping branches. 3. Their leaves are often needle-like. Which of the statements given above are correct?

The correct option is (c) 2 and 3 only. Explanation Trees growing in mountainous regions, particularly conifers, exhibit distinct morphological adaptations to withstand cold climates, high winds, and heavy snowfall. These adaptations differ significantly from the structural characteristics of trees found in plains. Statement-wise Analysis: - Statement 1 is Incorrect: Trees with broad, flat canopies are typically found in plains (e.g., Mango, Banyan) to maximize surface area for sunlight absorption. In contrast, mountain trees generally possess a conical shape. A broad, flat canopy would accumulate heavy snow, leading to branch breakage. - Statement 2 is Correct: Trees in mountain regions have sloping branches. This structural adaptation ensures that snow and rainwater slide off easily, preventing the accumulation of heavy loads that could damage the tree structure. - Statement 3 is Correct: The leaves of these trees are often needle-like (e.g., Pine, Deodar). This needle shape reduces the surface area, which helps in minimizing water loss through transpiration-crucial in frozen environments where liquid water is scarce-and further aids in shedding snow. Key Takeaway: Mountain trees are characterized by a conical shape, sloping branches, and needle-like leaves, which are critical adaptations for shedding snow and conserving water in cold environments.

With reference to trees found in mountain regions,... - NCERT Class 6 Science MCQ

Solution

The correct option is (c) 2 and 3 only.

Explanation

Trees growing in mountainous regions, particularly conifers, exhibit distinct morphological adaptations to withstand cold climates, high winds, and heavy snowfall. These adaptations differ significantly from the structural characteristics of trees found in plains.

Statement-wise Analysis:

Statement 1 is Incorrect: Trees with broad, flat canopies are typically found in plains (e.g., Mango, Banyan) to maximize surface area for sunlight absorption. In contrast, mountain trees generally possess a conical shape. A broad, flat canopy would accumulate heavy snow, leading to branch breakage.
Statement 2 is Correct: Trees in mountain regions have sloping branches. This structural adaptation ensures that snow and rainwater slide off easily, preventing the accumulation of heavy loads that could damage the tree structure.
Statement 3 is Correct: The leaves of these trees are often needle-like (e.g., Pine, Deodar). This needle shape reduces the surface area, which helps in minimizing water loss through transpiration-crucial in frozen environments where liquid water is scarce-and further aids in shedding snow.

Key Takeaway: Mountain trees are characterized by a conical shape, sloping branches, and needle-like leaves, which are critical adaptations for shedding snow and conserving water in cold environments.

NCERT Class 6 Science — Chapter 4: The living organisms - characteristics and habitats

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