With reference to the structure of a forest, consider the following statements: 1. The branchy part of a tree above the stem is known as the crown. 2. The roof-like structure formed by the branches is called the root system. 3. The forest floor is the only layer found in a forest. Which of the statements given above is/are correct?

The correct option is (a). Explanation Forest ecosystems are characterized by a distinct vertical structure known as stratification. This structure consists of different layers of vegetation arranged according to height, which influences the distribution of sunlight and microclimatic conditions within the forest. Statement-wise Analysis: - Statement 1 is Correct: The crown is the branchy part of a tree located above the stem (trunk). It consists of leaves, branches, and reproductive structures. The shape and size of the crown vary significantly across different tree species. - Statement 2 is Incorrect: The roof-like structure formed by the branches of tall trees over the other plants is called the canopy. The root system refers to the underground network of roots responsible for anchoring the tree and absorbing water and nutrients. - Statement 3 is Incorrect: The forest floor is not the only layer; it is the bottom-most layer consisting of decomposing organic matter, herbs, and fungi. A typical forest exhibits multiple layers, including the canopy, understory (shrubs and small trees), and the forest floor. Key Takeaway: A forest is structurally divided into vertical layers: the crown constitutes the top part of individual trees, the canopy forms the upper roof, and the forest floor is the ground layer rich in decomposers.

With reference to the structure… - NCERT Class 7 Environment & Ecology MCQ

NCERT Class 7 Environment & Ecology — Chapter 1: Forests: our lifeline

mcqmedium

With reference to the structure of a forest, consider the following statements:

The branchy part of a tree above the stem is known as the crown.
The roof-like structure formed by the branches is called the root system.
The forest floor is the only layer found in a forest.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 145

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a).

Explanation

Forest ecosystems are characterized by a distinct vertical structure known as stratification. This structure consists of different layers of vegetation arranged according to height, which influences the distribution of sunlight and microclimatic conditions within the forest.

Statement-wise Analysis:

Statement 1 is Correct: The crown is the branchy part of a tree located above the stem (trunk). It consists of leaves, branches, and reproductive structures. The shape and size of the crown vary significantly across different tree species.
Statement 2 is Incorrect: The roof-like structure formed by the branches of tall trees over the other plants is called the canopy. The root system refers to the underground network of roots responsible for anchoring the tree and absorbing water and nutrients.
Statement 3 is Incorrect: The forest floor is not the only layer; it is the bottom-most layer consisting of decomposing organic matter, herbs, and fungi. A typical forest exhibits multiple layers, including the canopy, understory (shrubs and small trees), and the forest floor.

Key Takeaway:

A forest is structurally divided into vertical layers: the crown constitutes the top part of individual trees, the canopy forms the upper roof, and the forest floor is the ground layer rich in decomposers.

Your note

More from Chapter 1: Forests: our lifeline

Which of the following constitutes the primary group of pollinating agents in a forest ecosystem?

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Consider the following statements regarding the interdependence of plants and animals in a forest: 1. Animals depend on plants for food and shelter. 2. Plants are completely independent of animals for their reproduction. 3. Plants depend on animals for the supply of nutrients through decomposition of droppings. Which of the statements given above is/are correct?

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With reference to the role of forests in the water cycle, consider the following statements: 1. Trees release water vapour into the air through the process of condensation. 2. The forest canopy intercepts raindrops, preventing them from hitting the ground directly. 3. Forests facilitate the infiltration of water into the ground. Which of the statements given above is/are correct?

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With reference to nutrient cycling in a forest, consider the following statements: 1. Nutrients are cycled back into the soil through decomposition. 2. Humus prevents nutrients from being released into the soil. 3. Roots of living plants absorb nutrients released by decomposers. Which of the statements given above is/are correct?

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