Q1Multiple choice
Which of the following serve as green lungs?
- (a)Green pigment of the plants
- (b)Forests
- (c)Kitchen gardens
- (d)Green house gases
Show answer
(b) Forests
Chapter 17
Class 7 Science · 25 questions · 25 with answers
Questions
Q2Multiple choice
Boojho visited a forest near his town with his classmates and his teacher. As they were entering the forest, their class teacher told them not to make noise in the forest as noise could disturb
- (a)birds
- (b)animals
- (c)both birds and animals
- (d)plants
Show answer
(c) both birds and animals
Q3Multiple choice
Which among the following forest animals is the smallest?
- (a)Fox
- (b)Boar
- (c)Bison
- (d)Porcupine
Show answer
(d) Porcupine
Q4Multiple choice
Which of the following has the strongest stem?
- (a)A tree
- (b)A creeper
- (c)A climber
- (d)A bush
Show answer
(a) A tree
Q5Multiple choice
Which of the following is not prepared from the wood obtained from forest?
- (a)Paper
- (b)Thermocol
- (c)Matchsticks
- (d)Plywood
Show answer
(b) Thermocol
Q6Multiple choice
Which of the following is not the name of a tree?
- (a)Teak
- (b)Sal
- (c)Porcupine
- (d)Kachnar
Show answer
(c) Porcupine
Q7Multiple choice
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
Show answer
(a) semal, hornbill
Q8Multiple choice
Which of the products is not obtained from a forest?
- (a)Honey
- (b)Catechu
- (c)Gum
- (d)Ginger
Show answer
(d) Ginger
Q9Multiple choice
The branchy part of a tree above the stem is known as
- (a)crown
- (b)canopy
- (c)sapling
- (d)humus
Show answer
(a) crown
Q10Multiple choice
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 water table.
Show answer
(c) creating flood conditions.
Q11Very short answer
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?
Show answer
Forest absorbs the noise.
Q12Multiple choice
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. FORESTS : OUR LIFELINE 91
- (c)The forest keeps on growing and changing and can regenerate.
- (d)Forests protect the soil from erosion.
Show answer
(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. FORESTS : OUR LIFELINE 91
(c) The forest keeps on growing and changing and can regenerate.
(d) Forests protect the soil from erosion.
Q13Very short answer
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.
Show answer
grass → insects → frog → snake → eagle SHORT ANSWER QUESTIONS
Q14Short answer
Give names of any four birds which you expect to see in a forest.
Show answer
Jungle crow, myna, dove, kingfisher, koel, blue jay, hornbill, etc. (any four)
Q15Short answer
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.
Show answer
No, they would not have seen the same type of plants and animals. This is so because climatic conditions in the two forests would vary leading to variations in the types of plants and animals.
Q16Short answer
“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?
Show answer
The decaying animal dung provides nutrients to the growing seedlings.
Q17Match the following
Match Column I with Column II
Show answer
(a) (iii); (b) (v); (c) (iv); (d) (i); (e) (ii)
Q18Short answer
Deforestation may lead to floods. Why?
Show answer
Lesser number of trees will be available due to deforestation. In this condition of absence of trees the soil will not hold water leading to floods.
Q19Short answer
Name any four useful products other than wood, which we get from forests.
Show answer
Gum, oils, spices, fodder for animals, medicinal plants, etc. (any four). ANSWERS 135 LONG ANSWER QUESTIONS
Q20Long answer
Figure 17.1 shows a part of a forest. Fig. 17.1 Write any three activities going on in the forest on the basis of this figure.
This question refers to a figure in the original PDF.
Show answer
(i) Oxygen is given out by plant leaves. (ii) Carbon dioxide is consumed by the plants to prepare their food by the process of photosynthesis. (iii) Decomposers play an important role in providing nutrients to plants.
Q21Long answer
People say that nothing goes waste in a forest. Can you explain, how?
Show answer
Hint: (i) Dry leaves and remains of dead animals are converted to a dark csoloured substance called humus. This provides nutrients to the plants. (ii) Dead animals become food for vultures, crows, jackals and insects. (iii) Broken branches of trees are used as fuel by the people living in the vicinity of the forest.
Q22Long answer
Give any four factors which are responsible for the destruction of forests.
Show answer
(i) construction of roads. (ii) construction of buildings. (iii) industrial development. (iv) increasing demand of wood.
Q23Long answer
Draw a figure showing two animals, two birds and a few trees as a part of a forest.
Show answer
Picture of any forest with two animals and two birds.
Q24Long answer
All the needs of animals living in a forest are fulfilled. Justify this statement in a few sentences.
Show answer
Hint: Forest provides home (shelter), food and water to the animals living there.
Q25Long answer
“Forests are our lifeline.” Write five sentences on this topic.
Show answer
Hint: (i) Forests give oxygen to keep us alive. (ii) Forests absorb carbon dioxide, a gas which in excess in atmosphere contribute to climatic changes. (iii) Forests provide us wood, gum, medicinal plants and many more things. (iv) Forests save the soil from erosion. (v) Forests help in maintaining the ground water level.