i. The insects, butterflies, honeybees and birds help flowering plants in pollination.
ii. A forest is a purifier of air and water.
iii. Herbs form the lowest layer in the forest.
iv. The decaying leaves and animal droppings in a forest enrich the soil.
i. Forests protect the soil from erosion. True
ii. Plants and animals in a forest are not dependent on one another. False
iii. Forests influence the climate and water cycle. True
iv. Soil helps forests to grow and regenerate. True
Ans. Dead animals become food for vultures, crows, jackals and insects.
Q4. Which of the following is not a forest product?
(i) Gum (ii) Plywood (iii) Sealing wax (iv) Kerosene
Q5. Micro-organisms act upon the dead plants to produce
(i) sand (ii) mushrooms (iii) humus (iv) wood
Ans. Branchy part of a tree above the stem is known as the crown of the tree.
Ans. Branches of the tall trees look like a roof over the other plants in the forest. This is called a canopy.
Ans. Gum, oils, spices, fodder for animals and medicinal plants are some of the products which we get from the forest.
Ans. Trees have crowns of different types and sizes. These create different horizontal layers in the forest. These are known as understoreys.
Ans. Roots of trees normally bind the soil together, but in their absence the soil is washed away or eroded.
Ans. Humus is found in the top, organic layer of soil. Humus provides many useful nutrients to the soil.
Ans. The forest floor seem to be dark coloured as it is covered with a layer of dead and decaying leaves, fruits, seeds, twigs and small herbs. The decaying matter was moist and warm.
Ans. In nature trees produce enough seeds. The forest floor provides favourable conditions for them to germinate and develop into seedlings and saplings. Some grow up into trees.
Ans. Forest acts as a natural absorber of rainwater and allows it to seep. It helps maintain the water table throughout the year. Forests not only help in controlling floods but also help maintain the flow of water in the streams so that we get a steady supply of water.
Ans. Plants release oxygen through the process of photosynthesis. The plants help to provide oxygen for animal respiration. They also maintain the balance of oxygen and carbon dioxide in the atmosphere. That is why forests are called lungs.
Ans. The uppermost layer of the forest canopy intercept the flow of raindrops and most of the water come down through the branches and the stems of the trees. From the leaves it drips slowly over branches of the shrubs and herbs. Thus, raindrops do not hit the forest floor directly.
Ans. Forests are disappearing due to:
i. Construction of roads, buildings, industrial development and increasing demand of wood.
ii. Overgrazing of animals and indiscriminate felling of trees for agricultural land.
Download to practice offline.