Forests: Our Lifeline: Class 7 Science Q&A
35 free answers on Forests: Our Lifeline (Science) for Class 7 students, across CBSE, ICSE and State boards. Includes questions such as ““Forests are our lifeline.” Write five sentences on this topic.”, “Give any four factors which are responsible for the destruction of forests.”, “People say that nothing goes waste in a forest. Can you explain, how?”
Question & Answer
Questions
- ScienceClass 7CBSE
“Forests are our lifeline.” Write five sentences on this topic.
Soln: Forests are our lifeline for the following reasons (i) Forests give oxygen to keep us alive. (ii) Forests absorb carbon dioxide, a gas that contributes to climatic changes if its concentration increases in the atmosphere. (iii) Forests provide us with wood, gum, medicinal plants and spices. (iv) Forests save the soil from erosion. (v) Forests help in maintaining the groundwater level. vi) Forests avoid floods by in
- ScienceClass 7CBSE
All the needs of animals living in a forest are fulfilled. Justify this statement in a few sentences.
Soln: Animals are dependent on plants in the forest for many things. Plants provide 02 to the animals to respire. Animals are dependent on plants for the food either directly or indirectly. Herbivores obtain food directly from plants, carnivores depend on herbivores for food. Trees in the forest provide shelter to forest animals. Hence it is said that the needs of animals living in a forest are fulfilled.
- ScienceClass 7CBSE
Give any four factors which are responsible for the destruction of forests.
Soln: Factors responsible for the destruction of forests are (i) construction of roads. (ii) construction of buildings. (iii) industrial development. (iv) increasing demand for wood.
- ScienceClass 7CBSE
People say that nothing goes waste in a forest. Can you explain, how?
Soln: Nothing goes waste in a forest for the following reasons Dry leaves and remains of dead animals are converted to a dark coloured substance called humus. This provides nutrients to the plants. Dead animals become food for vultures, crows, jackals and insects. Broken branches of trees are used as fuel by the people living in the vicinity of the forest.
- ScienceClass 7CBSE
Name any four useful products other than wood, which we get from forests.
Soln: Gum, Spices, medicinal plants, catechu
- ScienceClass 7CBSE
Deforestation may lead to floods. Why?
Soln: In the absence of trees, soil loses its water holding capacity this causes floods. Hence deforestation leads to floods.
- ScienceClass 7CBSE
17. Match Column I with Column II Column I Column II a) Decomposers i) Dead plant and animal tissues b) Canopy iii) Habitat for wildlife c) Porcupine iii) Microorganisms d) Humus iv) Wild animal e) Forest v) Branches of tall trees
Soln: Column I Column II a) Decomposers iii) Microorganisms b )Canopy v) Branches of tall trees c) Porcupine iv)Wild animal d) Humus i) Dead plant and animal tissues e)Forest ii) Habitat for wildlife </t
- ScienceClass 7CBSE
“A bunch of seedlings were seen sprouting on a heap of animal dropping in a forest.” How do you think is the seedling benefited from the animal dung?
Soln: Growing seedlings obtain nutrients from decaying animal heap.
- ScienceClass 7CBSE
Two friends shared their experiences of their vacation trip to two different forests. Do you think they would have seen the same type of plants and animals during their respective trips? Give reason.
Soln: No, They might not see the same type of plants and animals in two different questions because climatic conditions in the two forests would be different which leads to variations in the types of plants and animals.
- ScienceClass 7CBSE
Give names of any four birds which you expect to see in a forest.
Soln: Jungle crow, myna, dove, kingfisher
- ScienceClass 7CBSE
Paheli wrote a food chain in the following way: frog → eagle → insects → grass → snake The chain is not in the correct order. Help her to write the food chain correctly.
Soln: grass→insects→frog→snake→eagle
- ScienceClass 7CBSE
State whether the following statements are true or false. If false, give the correct statement. (a) Forests influence climate, water cycle and air quality. (b) In a forest, trees form the uppermost layer, followed by herbs. The shrubs form the lowest layer of vegetation. (c) The forest keeps on growing and changing and can regenerate. (d) Forests protect the soil from erosion.
Soln: a) True b) False- In a forest, trees form the uppermost layer, followed by shrubs. The herbs form the lowest layer of vegetation. c) True d) True
- ScienceClass 7CBSE
Paheli while moving in a forest observed that there was no noise pollution, though lots of heavy vehicles were passing from the nearby highway. Explain why?
Soln: In Forests, there will be no noise pollution because forests absorb noise.
- ScienceClass 7CBSE
Forests are not responsible for (a) providing medicinal plants. (b) maintaining the flow of water into the streams. (c) creating flood conditions. (d) absorbing rainwater and maintaining the water table
Soln: Answer is (c) creating flood conditions. Explanation: Forests dos do not create flood rather they stops the flood by percolating the rainwater.
- ScienceClass 7CBSE
The branchy part of a tree above the stem is known as (a) crown (b) canopy (c) sapling (d) humus
Soln: The answer is (a) crown Explanation: Crown is the top part of the tree it consists of all the branches and leaves of the tree.
- ScienceClass 7CBSE
Which of the products is not obtained from a forest? (a) Honey (b) Catechu (c) Gum (d) Ginger
Soln: Answer is (d) Ginger Explanation: Ginger is not obtained from forests it is cultivated in the farms.
- ScienceClass 7CBSE
Pick the option which gives the names of a tree and an animal, respectively from the following. (a) semal, hornbill (b) sal, khair (c) chinkara, blue bull (d) neem, palash
Soln: Answer is (a) semal, hornbill Explanation: Semal is the name of tree and hornbill is the name of an animal.
- ScienceClass 7CBSE
Which of the following is not the name of a tree? (a) Teak (b) Sal (c) Porcupine (d) Kachnar
Soln: The answer is (c) Porcupine Explanation: Porcupine is an animal whereas Teak, Sal and Kachnar are trees.
- ScienceClass 7CBSE
Which of the following is not prepared from the wood obtained from forest? (a) Paper (b) Thermocol (c) Matchsticks (d) Plywood
Soln: The answer is (b) Thermocol Explanation: Paper, Matchsticks and plywood are prepared from the wood obtained from forest whereas thermocol is prepared from synthetic fibers.
- ScienceClass 7CBSE
Which of the following has the strongest stem? (a) A tree (b) A creeper (c) A climber (d) A bush
Soln: The answer is (a) A tree