Case Study Questions Class 6 Science Chapter 9 The Living Organisms Characteristics and Habitats
CBSE Class 6 Case Study Questions Science The Living Organisms Characteristics and Habitats. Important Case Study Questions for Class 6 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions The Living Organisms Characteristics and Habitats.
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CBSE Case Study Questions Class 6 Science The Living Organisms Characteristics and Habitats
Case study 1
In the sea, plants and animals aresurrounded by saline (salty) water. Mostof them use the air dissolved in water.There is very little water available inthe desert. It is very hot in the day timeand very cold at night in the desert. Theanimals and plants of the desert live onthe desert soil and breathe air from thesurroundings.The sea and the desert are verydifferent surroundings and we find verydifferent kind of plants and animals inthese two region. Let us lookat two very different kind of organismsfrom the desert and the sea – a cameland a fish. The body structure of a camelhelps it to survive in desert conditions.Camels have long legs which help to keep their bodies away from the heat of the sand. They excrete small amount of urine, their dung is dry and they do not sweat. Since camels losevery little water from their bodies, theycan live for many days without water.
Let us look at different kinds of fish.The thing that is common in all fishis their streamlined shape, which helps them move inside water. Fish have slippery scales on their bodies. These scales protect the fish and also help in easy movement through water. Fish have flat fins and tails that help them to change directions and keep their body balance in water. Gills present in the fish help them to use oxygen dissolved in water.
Que. 1) What help fish to change their directions in water?
(a) Grills
(b) Flat fins
(c) Tails
(d) Both (b) and (c)
Que. 2) In water, plants and animals use theair that is dissolved in water.
(a) True
(b) False
Que. 3) Fish breathe through their …………………………………………………………………………………….…..
(a) Tails
(b) Scales
(c) Grills
(d) None of the above
Que. 4) Describe the features that enable camels to survive in desert conditions?
Que. 5) How the presence of Scaleshelp fish to live underwater?
Answer Key
Que. 1. d) Both (b) and (c)
Que. 2. a) True
Que. 3. c) Grills
Que. 4) Answer: The body structure of a camel helps it to survive in desert conditions. Camels have long legs which help to keep their bodies away from the heat of the sand. They excrete small amount of urine, their dung is dry and they do not sweat. Since camels lose very little water from their bodies, they can live for many days without water.
Que. 5) Answer: Fish have slippery scales on their bodies. These scales protect the fish and also help in easy movement through water.
Case study 2
The place where organisms live iscalled habitat. Habitat means a dwellingplace (a home). The habitat provides food, water, air, shelter and other needsto organisms. Several kinds of plants and animals live in the same habitat.The plants and animals that live onland are said to live in terrestrialhabitats. Some examples of terrestrialhabitats are forests, grasslands, deserts,coastal and mountain regions. On theother hand, the habitats of plants and animals that live in water are called aquatic habitats. Lakes, rivers and oceans are some examples of aquatic habitats. There are large variations among terrestrial habitats like forests, grasslands, deserts, coastal and mountain regions located in different parts of the world.
The organisms, both plants and animals, living in a habitat are its biotic components. The non-living things such as rocks, soil, air and water in the habitat constitute its abiotic components.
Que.1) Habitat means ……..………………………………………………………………………………..…….
a) Grassland
b)Dwelling place
c) Terrestrial habitat
d) All of the above
Que. 2) Which of the following is an aquatic habitat?
a) Lakes
b) Forest
c) Oceans
d) Both (a) and (c)
Que.3) Non-living things are the biotic components of a habitat.
a) True
b) False
Que.4) Write a short note on biotic and abiotic components of a habitat?
Que.5) How terrestrial habitats are different from aquatic habitats?
Answer Key
Que.1. b) Dwelling place
Que.2. d) Both (a) and (c)
Que.3. b) False
Que.4) Answer: The organisms, both plants and animals, living in a habitat are its biotic components. The non-living things such as rocks, soil, air and water in the habitat constitute its abiotic components.
Que.5) Answer: The plants and animals that live on land are said to live in terrestrial habitats. Some examples of terrestrial habitats are forests, grasslands, deserts, coastal and mountain regions. On the other hand, the habitats of plants and animals that live in water are called aquatic habitats. Lakes, rivers and oceans are some examples of aquatic habitats.
Case study 3
Abiotic factors likeair, water, light and heat are importantfor the growth of plants. In fact, abioticfactors are important for all livingorganisms.We find that organisms exist in verycold as well as very hot climates, this is becausethey manage to survive through adaptation.
Adaptation is the method by whichorganisms get well adjusted to the climate. Adaptation does not take place in a short time because the abiotic factors of a region also change very slowly. Those organisms which cannot adapt to these changes die, and only the adapted ones survive. Organisms adapt to different Abiotic factors in different ways. This results in a wide variety of organisms in different habitats.
Que.1) Adaptation can happen in a short span of time.
a) True
b) False
Que.2) Which of the following is NOT an Abiotic factor?
a) Human beings
b) Air
c) Water
d)Heat
Que.3) …………………………………………………………………………………… helps organisms to exist in extreme climates.
a) Abiotic components
b) Habitats
c) Adaptation
d) None of the above
Que.4) Define the term Adaptation?
Que.5) Briefly explain how adaptation takes place?
Answer Key
Que.1. b) False
Que.2.a) Human beings
Que.3.c) Adaptation
Que.4) Answer: Adaptation is the method by which organisms get well adjusted to the climate.
Que.5) Answer: Adaptation does not take place in a short time because the abiotic factors of a region also change very slowly. Those organisms which cannot adapt to these changes die, and only the adapted ones survive. Organisms adapt to different Abiotic factors in different ways. This results in a wide variety of organisms in different habitats.
Case study 4
There are desert animals like ratsand snakes, which do not have long legsthat a camel has. To stay away from the intense heat during the day, they stayin burrows deep in the sand. These animals come out only during thenight, when it is cooler. Desert plants lose very little water through transpiration. The leaves in Desert plants are either absent, very Small, or they are in the form of spines. This helps in reducing loss of water from the leaves through transpiration. The Leaf-like structure you see in a cactus is, in fact, its stem. Photosynthesis in these plants is usually carried out by the stems.
Mountain habitats are normally very cold and windy. In some areas, snowfall may take place in winters. Here, Trees are normally cone shaped and have sloping branches. The leaves of some of these trees are needle-like. This helps the rainwater and snow to Slide off easily. Animals living in the mountain regions are also adapted to the conditions there. They have thick skin or fur to protect them from cold. For example, yaks have long hair to keep them warm. Snow leopard has thick fur on its body including feet and toes. This protects its feet from the cold when it walks on the snow.
Que. 1) Photosynthesis in desert plants is carried out through it’s………………………………………………………………………………….…….
a) Leaves
b) Stem
c) Roots
d) None of the above
Que.2) Which of the following can survive in mountain habitats?
a) Snow leopard
b) Rats
c) Yaks
d) Both (a) and (c)
Que.3) Trees in mountain habitats are of cone shaped and have needle like leaves.
a) True
b) False
Que.4) Explain the features that help desert plants to survive in extreme heat?
Que.5) How animals in mountain habitats are adapted to its conditions?
Answer Key
Que.1. b) Stem
Que.2. d) Both (a) and (c)
Que.3. a) True
Que.4) Answer: The leaves in Desert plants are either absent, very Small, or they are in the form of spines. This helps in reducing loss of water from the leaves through transpiration. Thus, helping plants to survive in such conditions.
Que.5) Answer: Animals in mountain habitats have thick skin or fur to protect them from cold. For example, yaks have long hair to keep them warm. Snow leopard has thick fur on its body including feet and toes. This protects its feet from the cold when it walks on the snow.
Case study 5
Apart from fish, many other Sea animals have streamlined bodies to help them move easily in water. There are some sea animals like squids and octopus, which do not have this streamlined shape. They stay deeper in the ocean, near the seabed and catch any prey that moves towards them. However, when they move in water they make their body shapes streamlined. These animals have gills to help them use oxygen dissolved in water. There are some sea animals like dolphins and whales that do not have gills. They breathe in air through nostrils or blowholes that are located on the upper parts of their heads. This allows them to breathe in air when they swim near the surface of water. They can stay inside the water for a long time without breathing. They come out to the surface from time to time, to breathe in air.
Plants growing in ponds, lakes and rivers have their roots fixed in the soil below the water. In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size and their main function is to hold the plant in place. The stems of these plants are long, hollow and light. The stems grow up to the surface of water while the leaves and flowers, float on the surface of water. Some aquatic plants are submerged in water. All parts of such plants are under water. Some of these plants have narrow and thin ribbon-like leaves. These can bend in the flowing water.
Que.1) Sea animals like octopus and squids do not have a streamlined shape.
a) True
b) False
Que.2) Name the sea animal that do not have gills?
a) Octopus
b) Dolphins
c)Fish
d) None of the above
Que.3) Whales breathe in air through ………………………………………………………………………………………………….
a) Gills
b) Tails
c) Blowholes
d) None of the above
Que.4) Explain how some sea animals that do not have gills breathe in water?
Que.5) How roots in aquatic plants are different from those of terrestrial plants?
Answer Key
Que.1. a) True
Que.2. b) Dolphins
Que.3. c) blowholes
Que.4) Answer:There are some sea animals like dolphins and whales that do not have gills. They breathe in air through nostrils or blowholes that are located on the upper parts of their heads. This allows them to breathe in air when they swim near the surface of water. They can stay inside the water for a long time without breathing. They come out to the surface from time to time, to breathe in air.
Que.5) Answer: In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size and their main function is to hold the plant in place.
Case study 6
When we inhale, the air moves from outside to the inside of our body. When we breathe out, the air moves from inside our body to outside. Breathing is part of a process called respiration. In respiration, some of the oxygen of the air we breathe in, is used by the body. We breathe out carbon dioxide produced in this process. The process of breathing in animals like cows, buffaloes, dogs or cats is similar to humans. Respiration is necessary for all livingorganisms. It is through respiration that the body finally obtains energy from thefood it takes.Some animals may have different mechanisms for the exchange of gases,which is a part of the respiration process. For example, earthworms breathethrough their skin. Fishhave gills for using oxygen dissolved inwater. The gills absorb oxygen from theair dissolved in water. Respiration also takes place in plants. Exchange of gases in plants mainly takes place through leaves. The leaves take in air through tiny pores in them and use the oxygen. They give out carbon dioxide to the air. The amount of oxygen released in the process of food preparation by plants is much more than the oxygen they use in respiration.
Changes in our surroundings that makes us respond to them, are called stimuli. All living beings respond to stimuli, including plants. Flowers of some plants bloom only at night. In some plants flowers close after sunset. In some plants like Mimosa, commonly known as ‘touch-me-not’, leaves close or fold when someone touches them. These are some examples of responses of plants towards changes in their surroundings.
Que.1) Respiration in ………………………………………………………………………… takes place through their skin.
a) Mimosa
b) Earthworms
c) Fish
d) None of the above
Que.2) During photosynthesis, the amount of …………………………………………………………………………….……… released by plants is much more than it uses during Respiration?
a) Oxygen
b) Carbon dioxide
c)Energy
d) All of the above
Que.3) The leaves of mimosa or touch me not plant closes or folds, when someone touches them?
a) True
b) False
Que.4) Define the term respiration?
Que.5) Explain the process of Respiration in plants?
Answer Key
Que.1. b) Earthworms
Que.2. a) Oxygen
Que.3. a) True
Que.4) Answer: Breathing is part of a process called respiration. In respiration, some of the oxygen of the air we breathe in, is used by the body. We breathe out carbon dioxide produced in this process.
Que.5) Answer: Exchange of gases in plants mainly takes place through leaves. The leaves take in air through tiny pores in them and use the oxygen. They give out carbon dioxide to the air. The amount of oxygen released in the process of food preparation by plants is much more than the oxygen they use in respiration.
Case study 7
All organisms need food. Not all thefood that is eaten is completely used,only a part of it is utilised by the body. The rest has tobe removed from the body as wastes. Ourbody produces some wastes in other lifeprocesses also. The process of gettingrid of wastes by organisms is known asexcretion. Plants also excrete. They do, butnot as seen in animals. The mechanismsin plants are a little different. Some plantsfind it possible to store the waste productswithin their parts in a way that they donot harm the plant as a whole. Someplants remove waste products assecretions.Excretion is another characteristiccommon to all organisms.
Animals reproduce their own kind. The mode of reproduction may be Different, in different animals. Some Animals produce their young ones through eggs. Some animals give birth to the young ones. Plants also reproduce. Like animals, Plants also differ in their mode of Reproduction. Many plants reproduce through seeds. Plants produce seeds, which can germinate and grow into new plant. Some plants also reproduce through parts other than seeds. For example, a part of a potato with a bud, grows into a new plant. Plants also reproduce through cuttings. Living things produce more of their own kind through reproduction.
Que.1) Only a part of food is required by our body and the rest is removed through secretion.
a) True
b) False
Que.2) Which of the following is a mode of Reproduction in plants?
a) Eggs
b) Seeds
c) Cuttings
d) All of the above
Que.3) Living things produce their own kind through the process of …………………………………………………………………………………………….
a) Excretion
b)Respiration
c) Reproduction
d) Secretion
Que.4) Define the term Excretion?
Que.5) Explain the process of excretion in plants?
Answer Key
Que.1. b) False
Que.2. d) All of the above
Que.3. c) Reproduction
Que.4) Answer: The process of getting rid of wastes by organisms is known as excretion.
Que.5) Answer: Plants also excrete. They do, but not as seen in animals. The mechanisms in plants are a little different. Some plants find it possible to store the waste products within their parts in a way that they do not harm the plant as a whole. Some plants remove waste products as secretions.
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