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

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

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?

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?

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?

Match List I with List II and select the correct answer using the code given below: List I | List II A. Timber | 1. Plant Secretion B. Neem | 2. Construction Material C. Gum | 3. Non-forest Product D. Kerosene | 4. Medicinal Plant

In a dense forest ecosystem, the forest floor receives minimal sunlight primarily due to:

Consider the following statements about decomposers: 1. They are micro-organisms that live in the soil. 2. Decomposers feed exclusively on living plant tissues. 3. They convert dead matter into a light-colored substance called sand. Which of the statements given above is/are correct?

Match List I with List II and select the correct answer using the code given below: List I | List II A. Grass | 1. Producer B. Vulture | 2. Carnivore C. Mushroom | 3. Decomposer D. Tiger | 4. Scavenger

In a forest ecosystem, what is the likely immediate consequence of a drastic decline in the carnivore population?

Consider the following statements about the "forest floor": 1. The forest floor is generally dark due to the dense canopy above. 2. The forest floor is completely devoid of any dead or decaying matter. 3. The forest floor is sterile and supports no living organisms. Which of the statements given above is/are correct?

In a dense forest, the continuous roof-like layer formed by the branches of tall trees is known as:

Consider the following statements regarding the impact of deforestation on the carbon cycle: 1. The amount of carbon dioxide in the air will increase. 2. The earth's temperature will likely decrease significantly. 3. Photosynthesis will increase, balancing the CO2 levels. Which of the statements given above is/are correct?

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?

Which group of organisms plays the primary role in converting dead organic matter into humus?

In the context of forest ecology, what is the primary role of the "food chain"?

Consider the following statements regarding the interaction between forests and soil: 1. Forests protect the soil from erosion. 2. Soil hinders the growth and regeneration of forests. 3. Roots of trees bind the soil particles together. Which of the statements given above is/are correct?

With reference to the stability of the forest ecosystem, consider the following statements: 1. A greater variety of plants provides fewer opportunities for food for herbivores. 2. A larger number of herbivores leads to increased food availability for carnivores. 3. A wide variety of animals helps the forest to regenerate and grow. Which of the statements given above is/are correct?

In forestry and botany, the term "crown" refers to which part of a tree?

What is the primary ecological function of "humus" in forest soil?

Which process best explains the concept of "zero waste" in a natural forest ecosystem?

With reference to the forest ecosystem, consider the following statements: 1. If one food chain is disturbed, it does not affect other food chains. 2. Every part of the forest is dependent on the other parts. 3. Removal of trees would affect all other components of the forest. Which of the statements given above is/are correct?

Consider the following statements regarding the role of forests in climate control: 1. Forests influence the water cycle. 2. Forests have no influence on the quality of air. 3. Forests help in regulating the local temperature. Which of the statements given above is/are correct?

Consider the following statements about the forest environment: 1. The environment is peaceful due to noise absorption. 2. The presence of vegetation causes hot winds to blow in the forest. 3. The forest floor is covered with a layer of dead and decaying matter. Which of the statements given above is/are correct?

Consider the following statements regarding the regeneration of forests: 1. Forests cannot regenerate without human intervention. 2. Animals play a crucial role in the regeneration process. 3. Seedlings of herbs and shrubs can sprout from decaying animal droppings. Which of the statements given above is/are correct?

Which of the following pairs is correctly matched? 1. Autotrophs Green plants 2. Heterotrophs Animals 3. Saprotrophs Organisms feeding on dead matter Select the correct answer using the code given below

Consider the following statements about the "Green Lungs" concept: 1. Plants release oxygen through photosynthesis. 2. Plants consume oxygen released by animals for photosynthesis. 3. Animals release carbon dioxide which is used by plants. Which of the statements given above is/are correct?

With reference to the "water purifying system" of nature, consider the following statements: 1. Forests act as major sources of water pollution. 2. The root system helps water seep into the ground, filtering it. 3. Forests help in recharging the groundwater. Which of the statements given above is/are correct?

Which of the following agents plays a significant role in the dispersal of seeds in a forest ecosystem?

Which group of organisms is primarily responsible for converting dead organic matter into humus?

Consider the following pairs regarding forest layers: 1. Canopy — Roof-like upper layer 2. Understorey — Horizontal layers below canopy 3. Forest Floor — Lowest layer with decaying matter 4. Crown — Underground root system Which of the pairs given above are correctly matched?

With reference to the role of vegetation in the hydrological cycle, how does dense forest cover typically affect the local water table?

The forest floor is often described as a "spongy carpet" primarily due to the presence of:

What is the ecological role of organisms such as mosses and mushrooms found on the forest floor?

Consider the following statements about the "humus" formation process: 1. It releases heat, making the decaying heap warm. 2. It is a chemical process carried out by sunlight. 3. It involves the synthesis of new plant tissues from inorganic matter. Which of the statements given above is/are correct?

Which of the following functional roles of forests justifies the metaphor "green lungs"?

Which term is used to describe the upper branchy part of a tree above the main stem?

Which of the following is NOT a direct environmental consequence of deforestation?

Consider the following statements regarding the "canopy": 1. It is the lowest layer of vegetation in a forest. 2. It acts as a roof over the other plants in the forest. 3. It intercepts heavy rainfall, protecting the soil. Which of the statements given above is/are correct?

In the vertical stratification of a forest, which layer is typically occupied by herbs?

Consider the following statements about the "dynamic" nature of a forest: 1. A forest is a dynamic living entity. 2. Animals play no role in the dispersal of seeds. 3. Animal dung inhibits the growth of seedlings. Which of the statements given above is/are correct?

Consider the following statements regarding the vegetation layers in a forest: 1. Giant and tall trees constitute the top layer. 2. Shrubs and tall grasses form the lowest layer of the forest. 3. Herbs form the lowest layer of vegetation in the forest. Which of the statements given above is/are correct?

With reference to the "water table", consider the following statements: 1. Forests help maintain the water table throughout the year. 2. The root system prevents water from seeping into the ground. 3. Deforestation leads to an increase in the water table level. Which of the statements given above is/are correct?

With reference to the "understoreys" in a forest, consider the following statements: 1. They are formed due to trees having crowns of different types and sizes. 2. They create a single uniform horizontal layer in the forest. 3. The composition of understoreys is identical in all forests globally. Which of the statements given above is/are correct?

With reference to the forest atmosphere, consider the following statements: 1. Forests amplify noise from nearby highways. 2. The air in a forest is generally cooler than in the surrounding urban areas. 3. Forests help in maintaining the balance of oxygen and carbon dioxide. Which of the statements given above is/are correct?

Which of the following forest products is the primary raw material used for making sealing wax?