Case Study Questions Class 7 Science Chapter 17 Forests: Our Lifeline
CBSE Class 7 Case Study Questions Science Forests: Our Lifeline. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Forests: Our Lifeline.
At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.
CBSE Case Study Questions Class 7 Science Forests: Our Lifeline
Case study 1
One evening Boojho entered thepark with an elderly person. He introduced him to his friends.Prof Ahmad was a scientist working inthe university. The children startedplaying while Prof Ahmad sat on abench in the corner. He was tired as hehad participated in the golden jubileecelebrations of the town. After a while,the children also came and sat aroundhim. They wanted to know about thecelebrations. Prof Ahmad told them thatafter the cultural Programme, thesenior people discussed the town’sunemployment problem. A plan wasproposed to put up a factory by clearingan area of the forest just outside thetown.
This would give the increasingpopulation of the town a chance to getjobs. The children were very surprisedwhen Prof Ahmad told them that many people had objected to this idea. “This is because the forests serve asgreen lungs and water purifying systemsin nature”, Prof Ahmad explained. Thechildren were confused. Prof Ahmadrealized that the children had not visiteda forest. The children also wanted toknow more about the forest, so theydecided to visit it with Prof Ahmad.
Que. 1) Who was Professor Ahmed?
(a) A scientist
(b) Teacher
(c) Principle
(d) Student
Que. 2) What is the lungs of nature which also serves as water purifying systems?
(a) Water
(b) Sky
(c) Ground
(d) Forest
Que. 3) Bhoojo entered the park with……………………………………………………………………..………………………..
(a) Friend
(b) Elderly person
(c) Mother
(d) Father
Que. 4) Why did Professor Ahmed sat on a bench in the corner?
Que. 5) With whom children visited the forest? and why?
Answer Key
Que. 1)(a) A scientist
Que. 2) (d) Forest
Que. 3) (b) Elderly person
Que. 4) Answer: Professor Ahmed sat on the bench because he was tired as he had attended the golden jubilee celebration
Que. 5) Answer: The children visited the forest with Professor Ahmed to know about the forest as they have never visited a forest before.
Case study 2
One Sunday morning, the children packed a few things like a knife, a handlens, a stick, a notebook and walkedtogether through a forest trail near avillage. On their way, they met Tibu, ayoung boy of their age group, of nearbyvillage, who was taking cattle for grazingalong with his aunt. He was very agile,running here and there to keep the herdtogether. When he saw the children,Tibu also started walking along withthem, while his aunt went on a differentpath.
As soon as they entered the forestTibu raised his hand and signaled themto keep quiet because noise coulddisturb the animals living in the forest.Tibu then took them to a place at aheight to show them the broad view ofthe forest. Children were surprisedbecause they could not see any land. The different treetops hadformed green cover over the land. However, the cover was not uniformly green.
Que. 1) Tibu was taking his cattle for grazing along with whom?
(a) Friend
(b) Mom
(c) Dad
(d) Aunt
Que. 2) On which morning the children packed a few things?
(a) Sunday
(b) Monday
(c) Wednesday
(d) Saturday
Que. 3) Tibu took them to a………………………………………………………………………….…….to show them the wider view of forest
(a) Base
(b) Tree
(c) Height
(d) Branch
Que. 4) Why did Tibu signaled his friends to keep quiet?
Que. 5) What things did the children packed?
Answer Key
Que. 1)(d) Aunt
Que. 2) (a) Sunday
Que. 3) (c) Height
Que. 4) Answer: Tibu signaled his friends to keep quiet because too much noise could create disturbance among animals.
Que. 5) Answer: The children packed a few things like knife, stick, notebook, hand lens etc.
Case study 3
Prof Ahmad asked children to pickup leaves from the forest floor andobserve them under a hand lens. Theyfound tiny mushrooms over thedecaying leaves. They also saw an armyof tiny insects, millipedes, ants andbeetle on them. They were wonderinghow these organisms live there. Prof Ahmadexplained that apart from these animals which are easily seen, there are severalorganisms and micro-organisms thatlive in the soil. Paheli wondered what mushroom and other micro-organismseat. Prof Ahmad replied that they feedupon the dead plant and animal tissues and convert them into a dark coloredsubstance called humus.The micro-organisms which convertthe dead plants and animals to humusare known as decomposers. Thesemicro-organisms play an important rolein the forest. Soon, Paheli removed somedead leaves and discovered under thema layer of humus on forest floor. Thepresence of humus ensures that thenutrients of the dead plants andanimals are released into the soil. Fromthere, these nutrients are again absorbedby the roots of the living plants. “What happens if an animal dies in the forest?”Sheila asked. Tibu replied the deadanimals become food for vultures, crows,jackals and insects.” In this way, thenutrients are cycled. So, nothing goeswaste in a forest.
Que. 1) Under a…………………………………………………………….…………………..the children observed the leaves.
(a) Torch
(b) Microscope
(c) Hand lens
(d) Hand
Que. 2) They found……………………………………………………………………….….over the………………………………………………………….………………….
(a) Tiny mushrooms, decaying leaves
(b) Fruits, leaves
(c) Ant, leaves
(d) Fruit, Ant
Que. 3) The nutrients in the soil are absorbed by which part of the plant?
(a) Roots
(b) Shoot
(c) Stem
(d) Leaves
Que. 4) What are decomposers?
Que. 5) What did the presence of humus ensures?
Answer Key
Que. 1)(c) Hand lens
Que. 2) (a) Tiny mushrooms, decaying leaves
Que. 3) (a) Roots
Que. 4) Answer: The microbes which feed up on the dead and decaying matter of plants, animals and convert it to humus are known as decomposers.
Que. 5) Answer: The presence of humus indicates that the nutrients from the dead and decaying organic matter are released in to the soil.
Case study 4
Paheli reminded Prof Ahmad that hehad not explained why forests are called
Green lungs. Prof Ahmad explained thatplants release oxygen through theprocess of photosynthesis. The plantshelp to provide oxygen for animalrespiration. They also maintain the balance of oxygen and carbon dioxidein the atmosphere. That iswhy forests are called lungs.The children saw clouds forming inthe sky. Trees take in water from their roots andrelease water vapour into the airthrough evaporation.
If there were fewer trees, how will thewater cycle be affected?Tibu told them that the forest is not just home to plants and animals. Manypeople also live in the forest. Some of them may belong to different tribes. Tibuexplained that these people dependmostly on the forests. The forest providesthem with food, shelter, water andmedicines. They have traditionalknowledge about many medicinal plantsin the forest.
Que. 1) Plants release oxygen through which process?
(a) Metabolism
(b) Catabolism
(c) Anabolism
(d) Photosynthesis
Que. 2) The children saw………………………………………………………………………forming in the sky.
(a) Animal
(b) Cow
(c) Bird
(d) Cloud
Que. 3) Trees take in water through………………………………………………………………………….……..and release it to environment in the form of………………………..……………………………………………..
(a) Roots, vapours
(b) Shoot, vapours
(c) Stem, water
(d) Leaves, gas
Que. 4) What did Paheli reminded Professor Ahmed?
Que. 5) What does the forest provide to humans?
Answer Key
Que. 1)(d) Photosynthesis
Que. 2) (d) Cloud
Que. 3) (a) Roots, vapours
Que. 4) Answer: Paheli reminded Professor Ahmad that he had not yet explained why forest is called the green lungs.
Que. 5) Answer: The forest provides food, shelter and medicines to humans.
Case study 5
While Boojho was drinking waterfrom a small stream, he saw some deercrossing the stream. Theydisappeared into the bushes. The densebushes and the tall grass provideanimals with the food and shelter. They also protect them from carnivores thatlive in the forest.Tibu then started looking closely atthe forest floor. Soon he called and showed the children droppings of some
Animals, and explained the differencebetween various types of droppings.Prof Ahmad informed them that theforest officers could recognize thepresence of some animals in the forestby their droppings and footprints.Boojho called every one and showedthem a large, decaying heap of animaldropping. Several beetles and grubswere feeding on the heap and a bunchof seedlings was sprouting.
“Theseseedlings are of the herbs and shrubs the animals also disperse the seeds ofcertain plants and help the forest to growand regenerate. The decaying animaldung also provides nutrients to theseedlings to grow”, said Prof Ahmad.After listening to this, Boojho notedin his notebook, “By harboring greatervariety of plants, the forest providesgreater opportunities for food andhabitat for the herbivores. Largernumber of herbivores means increasedavailability of food for a variety of carnivores. The wide variety of animalshelps the forest to regenerate and grow.Decomposers help in maintaining thesupply of nutrients to the growing plants in the forest. Therefore, the forest is a‘dynamic living entity’ — full of life andvitality.”
Que. 1) What did Bhoojo saw while drinking water from a small stream?
(a) Lion
(b) Tiger
(c) Deer
(d) Man
Que. 2) Who help the forest to regenerate and grow?
(a) Humans
(b) Animals
(c) Plants
(d) Cow
Que. 3) The decaying animal dung provides…………………………………………………………………………..……for the seedlings to…………………………………………..………………………………………….
(a) Nutrients, grow
(b) Methane, grow
(c) Carbon, mature
(d) Nitrogen, die
Que. 4) Who help in supplying nutrients to growing plants?
Que. 5) What does large number of herbivores means?
Answer Key
Que. 1)(c) Deer
Que. 2) (b) Animals
Que. 3) (a) Nutrients, grow
Que. 4) Answers: Decomposers are the microbes who help in maintaining the supply of nutrients required for the growth of plants.
Que. 5) Answer: Large number of herbivores indicates that there is more availability of food for the carnivores.
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