EDULABZ. Ans. (b) 3. The part of the Earth where life exists is called. Ans. (c) 4. The biotic components of the environment are

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1 7 OUR ENVIRONMENT I. Multiple choice questions: Tick ( ) the correct choice. 1. The atmosphere consists of (a) troposphere, stratosphere, ionosphere (b) biosphere, geosphere, lithosphere (c) only biosphere (d) only geosphere Ans. (a) 2. The gas in the atmosphere which prevents harmful ultraviolet rays from reaching the earth is (a) carbon dioxide (b) ozone (c) oxygen (d) carbon monoxide Ans. (b) 3. The part of the Earth where life exists is called (a) atmosphere (b) hydrosphere (c) biosphere (d) lithosphere Ans. (c) 4. The biotic components of the environment are (a) producers (b) carnivores (c) herbiovores (d) all the above 5. Vultures play the role of... environment. (a) hebivores (b) scavengers (c) carnivores (d) decomposers Ans. (b) 6. Increase in concentration of... gas has led to global warming. (a) ozone (b) sulphur dioxide (c) nitrogen (d) carbon dioxide Biology Class VI 1 Question Bank

2 7. The solar system does not include (a) moon (b) poler star (c) earth (d) sun Ans. (b) 8. Because of the following the earth is the only planet in the solar system to support life. (a) Gravitational force (b) Distance from the sun (c) Presence of air and water (d) All the above 9. Which of the following is called blue planet? (a) Earth (b) Saturn (c) Moon (d) Mars Ans. (a) 10. The innermost layer of earth is called (a) crust (b) core (c) mantle (d) none Ans. (b) 11. Biotic environment includes (a) producers (b) consumers (c) decomposers (d) all the above 12. Which of these is a carnivore? (a) Goat (b) Sheep (c) Cow (d) Lion 13. Ozone of the air is (a) useful (b) harmful (c) no effect (d) partially harmful Ans. (a) 14. Decomposers include (a) bacteria (b) fungi (c) both (d) none Ans. (c) 15. The outer solid layer of the earth is called (a) lithosphere (b) atmosphere (c) hydrosphere (d) biosphere Ans. (a) 16. How much time the light takes from the sun to reach the earth? (a) No time (b) 8 light year (c) 8 minutes (d) 1.8 sec Ans. (c) Biology Class VI 2 Question Bank 2

3 17. Which of the following is not a green house gas? (a) Methane (b) Nitrogen (c) Carbon dioxide (d) CFC Ans. (b) 18. Which of the following is not an omnivore? (a) Crow (b) Man (c) Tiger (d) Domestic cat Ans. (c) 19. The gas which prevents the entry of ultraviolet rays to the earth is (a) nitrogen (b) ozone (c) carbon dioxide (d) oxygen Ans. (b) 20. The study of interaction and relationship between living things and their environment is called (a) physiology (b) zoology (c) ecology (d) morphology Ans. (c) 21. Animals depend on plants for (a) food alone (b) shelter alone (c) carbon dioxide (d) food and oxygen 22. The dead and decaying plants and animals are acted upon by (a) consumers (b) decomposers (c) producers (d) herbivores Ans. (b) 23. Ozone layer protects plants and animals from the harmful (a) light (b) ultraviolet rays (c) β-rays (d) X-rays Ans. (b) 24. Sulphur dioxide and other gases given out by industries cause (a) rain (b) flood (c) acid rain (d) none Ans. (c) 25. The production and management of fishes is called (a) breeding (b) agriculture (c) shearing (d) pisciculture Biology Class VI 3 Question Bank

4 26. The silk moth produces silk when it is at the stage called (a) egg (b) adult (c) larva (d) pupa 27. Jute is obtained from (a) leaves (b) fruits (c) seed (d) stem 28. Sunflower is a good source of (a) fibre (b) medicines (c) oil (d) rubber Ans. (c) II. Which of the following statements are true (T) and which ones are false (F)? Mark T or F. 1. Green plants respire by taking in both carbon dioxide and oxygen. 2. The ultimate source of energy for all organisms is the green plant. 3. The interaction of living organisms with the non-living environment constitutes the ecosystem. 4. The survival of all living things is dependent on one another. 5. Organisms which feed on dead bodies are called scavengers. 6. Ultraviolet radiation is absorbed by ozone. 7. The outer crust on the earth s surface is called troposphere. 8. The production of carbon dioxide gas in the atmosphere is about 0.03%. 9. When the amount of carbon dioxide gas increases in the atmosphere, its temperatures will rise. 10. We should encourage the use of plastic bags. Ans. 1. False 2. False 3. True 4. True 5. True 6. True 7. False 8. True 9. True 10. False. III. Find the odd one out. 1. Mango tree, algae, eucalyptus tree and yeast Ans. Yeast is heterotropic while mango tree, algae and Eucalyptus are autotrophic. Biology Class VI 4 Question Bank 4

5 2. Deer, goat, vulture and horse Ans. Vulture is carnivore while dear, goat and horse are herbivore. 3. Lion, giraffe, leopard and tiger Ans. Giraffe is herbivore while lion, leopard and tiger are carnivore. 4. Bear, eagle, crow and human Ans. Eagle is carnivore while bear, crow and human are omnivore. 5. Shark, vulture, sparrow and maize Ans. Maize is plant while shark, vulture and sparrow are animals. IV. Give reasons for the following. 1. Animals in a food chain are consumers. Ans. In a food chain, animals are consumers. Because animals cannot prepare their own food. They depend on plants or other animals for their food. 2. Consumers depend on producers in a food chain. Ans. Consumers depend on producers in a food chain because they can not prepare their own food. 3. Deforestation should be checked. Ans. We must check deforestation because it leads to soil erosion which makes the soil infertile. Due to deforestation, habitat of some wild animals like lions, birds etc. is disturbed. Frequent floods and less rainfall are also occur due to deforestation. 4. Air pollution is harmful to us. Ans. Air pollution is harmful to us because it causes thinning of ozone layer that prevents the entry of harmful ultraviolet radiation. The ultraviolet radiation can cause skin cancer and also harm other living beings. Due to air pollution, disorders of respiratory system (like bronchitis and asthma) and irritation in the eyes, nose, and throat are also occur. 5. We should not pollute water. Ans. To complete the demand of increased population, we are using natural resources, in which water is the most useful resources. The unwanted and harmful chemical substances like pesticides, Biology Class VI 5 Question Bank

6 fertilisers, industrial run off garbage, sewage, etc., Causes water pollution. These unwanted substances affects life in water, reduces oxygen availability to the aquatic fishes, other aquatic organisms and plants. Due to polluted water, human beings are infected by a number of water-born diseases like, typhoid, cholera, jaindice and dysentery. 6. We should not use too many fertilisers and insecticides. Ans. To increase the production of crops, we are using too much fertilisers and insecticides. Excessive use of fertilisers and insecticides leads to land pollution as well as water pollution. The accomulation of these harmful chemicals into plants as well as soil micro-organisms and animals through food chain and affect their life. V. Complete the table: Gases Percentage Nitrogen Carbon dioxide Oxygen Ans. Gases Percentage Nitrogen 78% Carbondioxide 0.03% Oxygen 21% VI. Identify biotic and abiotic factors: (i) Grass (ii) Sunlight (iii) Peacock (iv) Humidity (v) Soil (vi) Earthworm (vii) Tree (viii) Heat (ix) Air (x) Man (xi) Wind (xii) Omnivore (xiii) Bacteria Ans. Biotic factors: Grass, Peacock, Earthworm, Tree, Man, Omnivore, Bacteria. Abiotic factors: Sunlight, Humidity, Soil, Heat, Air, Wind. Biology Class VI 6 Question Bank 6

7 VII. Draw a food web interlinking the following: Snake, Tree, Lion, Peacock, Rabbit, Squirrels, Grass, Deer. Ans. Lion Peacock Snake Deer Squirrels Rabbit Grass; Tree Food Web VIII. Fill in the blanks. 1. The two major components of environment are... and The process of eating and being eaten is termed as Animals that feed on dead flesh are called Organisms which decompose dead and decaying bodies and get nutrition are called Interlinked food chains constitute a The food chain consists of producers and Bacteria and fungi act as... in the environment. 8. The primary source of energy for all living organisms is the.... Biology Class VI 7 Question Bank

8 9. Plastic bags cannot be recycled because they are Vegetables, leaves and fruits are easily decomposed because they are Three examples of scavengers in the environment are...,... and The study of interaction between living things and their environment is called The non-living things in an environment are called... factors. 14. Green plants which make their own food are called An organism that eats other organisms is called a The carnivores which feed on dead animals are called A consumer that eats both plants and animals is called an Unidirectional flow of energy in the form of food from one organism to the other is called Food chains are connected together to make a Introduction of unwanted, harmful material into an environment is called Living things in an environment are called... factors. 22. The physical and the biological world we live in is called the Green plants which make their own food are named as.... Ans. 1. Biotic, Abiotic 2. Food chain 3. Scavengers 4. Decomposers 5. Food web 6. Consumers 7. Decomposers 8. Plant 9. Nonbiodegradable 10. Biodegradable 11. Hawks, crows, vultures 12. Ecology 13. Abiotic 14. Autotrophs 15. Carnivore 16. Scavengers 17. Omnivore 18. Food chain 19. Food web 20. Pollution 21. Biotic 22. Habitat 23. Autotrophs. Biology Class VI 8 Question Bank 8

9 IX. Give differences between the following: 1. Food chain and Food Web. Ans. Food Chain Food Web (1) A food chain is a diagram (1) Food web is formed by a showing what animals eat, many food chains which or a chain showing the are interlinked to each process of eating and being other. eaten. (2) A food chain is unidirec- (2) A food web is not tional. unidirectional. (3) Grass Insect Frog (3) Insects Lizards Plants Eagle Eagle Snake Snail Smake A food chain A food web 2. Producers and Consumers. Ans. Producers Consumers (1) They are autotrophs and (1) They are heterotrophs and prepare their own food by take food prepared by the process of photosynthesis. producers. (2) All the food chains in the (2) Food chains do not start the biosphere start from the from consumers. producers. (3) All the green plants are (3) All the living animals are included as producers. included as consumers. (4) Producers are not depend (4) Consumers are depend upon consumers for food, e.g. all green plants. upon producers, directly or indirectly for food, e.g. deer, goat, sheep. Biology Class VI 9 Question Bank

10 3. Herbivores and Carnivores. Ans. Herbivores Carnivores (1) The animals which feed on (1) The animals which feed on plants are called herbivores. the flesh of other animals are called carnivores. (2) Herbivores are also called (2) Carnivores are also called primary consumers, secondary consumers, e.g. rabbit, deer. e.g. lion, tiger. 4. Decomposers and Scavengers. Ans. Decomposers Scavengers (1) Decomposers are the micro- (1) Some carnivores feed on organisms that decompose dead animals. These dead and decaying matter, animals are called scavengers, e.g. bacteria and fungi e.g. vulture and eagle. (2) These are micro-organisms (2) These are big animals and and cannot be seen by can be seen by naked eyes. naked eyes. 5. Biotic factors and Abiotic factors. Ans. Biotic factors Abiotic factors (1) These are living factors. (1) These are non-living factors. (2) These factors include plants (2) These factors include air, and animals, water, light, temperature, i.e. producers, consumers clouds and soil. and decomposers. (3) In biotic factors, green (3) In abiotic factors, sunlight plants are main components is the main component because they are the because it is the ultimate primary sources of food. source of energy. Biology Class VI 10 Question Bank 10

11 X. Define the following terms. 1. Ecology Ans. The study of the inter-relationship among organisms and between organisms and their surroundings, living and nonliving, is called ecology. Living organisms cannot live in isolation. They interact with one another and also interact with non-living surroundings in which they live. 2. Ecosystem Ans. An ecosystem is a natural unit consisting of all plants, animals and microoganisms in an area functioning together with all of the non-living physical factors of the environment. 3. Energy flow Ans. As we know, only green plants are capable to trap light energy and prepare their own food. These plants are eaten by herbivores and these herbivores are eaten by carnivores. Thus, energy is transferred from producers to herbivores and herbivores to carnivores as one organism eats the other. In this way, there is a unidirectional flow of energy. This unidirectional flow of energy in the form of food from one organism to another is called food chain. When several food chains are connected together then they form food web. But, now this balance is being disturbed by man by his activities to complete his demand. For example: deforestation, poaching, burning of fossil fuels etc. 4. Scavengers Ans. Scavengers are the carnivore animals that feed on dead animals. For example: vulture, eagle etc. 5. Population Ans. A population is the total number of individuals (of plants or animals) of the same kind living in one area. Or A group of one species that interbreed and live in the same place at the same time. Biology Class VI 11 Question Bank

12 6. Community Ans. A community means all plants and animals that live in one area or habitat. Thus, it includes different populations of plants and animals that exist in the same area. 7. Food chain Ans. All living things need food to live. Herbivores eat plants. These herbivores are eaten by carnivores. Thus, energy is transferred from producers to herbivores and from herbivores to carnivores. Thus, this unidirectional flow of energy in the form of food from one organism to another is called food chain. Or A diagramatic representation that showing what animals eat or a chain showing the process of eating and being eaten. e.g. Grass Insects Frog Snake Eagle 8. Lithosphere Ans. It is one of the important parts of earth that support life. It is outermost part of earth. The thickness of lithosphere is about km below the earth s crust. This part is the major source of fuels, such as coal, petrol and natural gas. It is also source of minerals which are required for making a number of things of daily uses. It plays an important role in the growth of plants and animals. 9. Hydrosphere Ans. Hydrosphere means the water on the earth. About 70% of the earth s surface is covered by water. Major water bodies are present in the form of oceans. All oceans of the world are contiguous. 10. Atmosphere Ans. It is the envelope of air that surrounds the lithosphere. It is one of the most important parts of biosphere. It extends upto a height of 40 km above the earth s surface and 99% of mass of air is present in this region. Major components of air is nitrogen followed by oxygen and carbon dioxide. Biology Class VI 12 Question Bank 12

13 XI. Answer the following questions: 1. Name two biodegradable materials. Ans. Paper and cloth are termed as biodegradable because they can undergo cycling. 2. Name one non-blodegradable material. Ans. Plastic is non-biodegradable because it cannot be recycled. 3. Name two scavengers. Ans. Vulture, jackals. 4. Name the raw materials used by plants to manufacture their food. Ans. Carbon dioxide and water are used in presence of sunlight for the photosynthesis. 5. Which gas is released during the process of photosynthesis? Ans. Oxygen is released in the process of photosynthesis. 6. How have the socio-cultural activities influenced our environment? Ans. Man is the dominant part of the natural environment. Man only has the capability to change their environment. The modified natural environment or man-made environment is also called socio-cultural environment. This socio-cultural environment has affected the quality of our natural environment as well as health. Now, we have polluted air to breathe, polluted water to drink, polluted soil for agricultural. 7. Give examples of three food chains operating in nature. Ans. Food chain in grassland Grass Insects Frog Snake Eagle Food chain in sea Algae Insects Small fish Large fish Food chain in a tree Tree Birds Snake Eagle Biology Class VI 13 Question Bank

14 8. Why are plants called producers? Ans. Plants are called producers because they can produce their own food with the help of sunlight by the process of photosynthesis. They are also called autotrophs. 9. What would happen if any of the links is missing in the food chain? Ans. Each organism in a food chain lays an important role. The number of herbivores, carnivores and omnivores are such that they create a balance in nature. If anyone of these is eliminated, an imbalance is created in nature. Plants Insects Lizards In this food chain, if lizards were eliminated, the population of insects would increase, which would further destroy plants. 10. Life would be impossible without plants. Explain. Ans. Life would be impossible on land without plants because plants are the primary producers on land. They can prepare their own food by the process of photosynthesis, by using carbon dioxide and water in presence of sunlight. All animals on land directly or indirectly, depend on plants. Thus, life would be impossible on land without plants. 11. Mention the role played by the decomposer in an ecosystem. Ans. Decomposers play a very important role in nature. They break down the remains of dead plants and animals into simple substances. They release nutrients from dead and decaying organic matter into environment. These nutrients are recessed by the plants and thus, help in the recycling of nutrients. 12. Name three pollutant each of air, water and soil. Ans. Air pollutions. (i) Smoke (ii) Harmful gases Water pollutants. (i) Sewage (ii) Industrial wastes Biology Class VI 14 Question Bank 14

15 Soil pollutants. (i) Fertilisers (ii) Pesticides 13. How do plants depend upon animals? Ans. Plants depend upon animals in the following ways: (i) For carbon dioxide. It is most important factor for which plants depend upon animals, because plants need carbon dioxide to prepare food through photosynthesis. This carbon dioxide comes from animals during respiration. (ii) For pollination. In most of the plants, pollination is brought about by insects, birds, and bats. (iii) For dispersal of seeds. Some fruits are eaten by animals such as birds, which carry them to distant places. Some seeds have spines or hooks which stick to the body of animals and carried away from one place to the other. 14. How are animals dependent upon plants? Ans. Animals are dependent upon plants in the following ways: (i) For food. All the animals, directly or indirectly, for their food depend on green plants. (ii) For oxygen. In the process of photosynthesis, oxygen comes out. It is used by animals and plants for their respiration. (iii) For shelter. There are a number of animals which make their home on the plants. For example: birds make their nests on the trees. Some insects like ants, grasshopper are lives in the trees. 15. How are carnivorous animals dependent upon plants? Ans. In a food chain, carnivores are at the top. They depend upon herbivores for food and in turn herbivores are depend upon plants. Thus, indirectly, carnivores depend upon plants for their food. 16. What kind of organisms are first level consumers? Ans. The animals that eat plants are called herbivores or first level consumers. Biology Class VI 15 Question Bank

16 17. Why are scavengers and decomposers important for the environment? Ans. Scavengers and decomposers play a very important role for the environment. Without these living organisms, there would be only heaps of dead plants and animals. So, we cannot imagine earth without decomposers. 18. Why do all food chains start with plants? Ans. The main source of energy on the earth is the sunlight and only green plants have the ability to use the sunlight. Green plants make their own food by using water, minerals and carbon dioxide in the presence of sunlight. So, they are called producers or autotgrophs. Thus, all food chains start with green plants. 19. Put this food chain in correct order: Mouse Snake Wheat Owl. Ans. Wheat Mouse Snake Owl 20. Give three reasons that make life possible on earth. Ans. Earth is only the plant where life is possible. Following are the factors that make life possible on earth. (i) Distance from sun. (ii) Presence of atmosphere. (iii) Gravitational force. 21. State three human activities leading to imbalance in nature. Ans. Three human activities that are leading to imbalance in nature are: (i) Deforestation. By cutting down trees for his needs of firewood, timber, wood for furniture and land for agricultural uses. (ii) Burning of fossil fuels. Excessive burning of fossil fuels is causing an increase in carbon dioxide concentration in the air. (iii) Use of fertilisers and pesticides. Excessive use of fertilisers and pesticides also disturb the balance in nature. They cause soil as well as water pollution. Biology Class VI 16 Question Bank 16

17 22. What is meant by differentiation? Ans. The reorganisation of the earth into layered state is known as differentiation. The earth is organised into three layers: (i) Crust (ii) Mantle (iii) Core 23. What do you understand by mantle? Ans. Mantle is the second layer of the earth and present between the crust and the core layers. The thickness of the mantle is about 2900 km below the earth s crust. Its density ranges between 4 and 6 g/cm How does ozone layer protect us from harmful effects of ultraviolet radiations? Ans. Ozone layer acts as a protective blanket for the earth. It protects the ertry of harmful ultraviolet rays. These ultraviolet rays can cause skin cancer in human beings and harm other living organisms. 25. What are CFCs? Ans. CFCs (chlorofluorocarbons) are several organic compounds of carbon, fluorine, chlorine and hydrogen. These are nonflammable, non-toxic compounds and are used in refrigerators. CFCs are manufactured under a trade name Freone. These compounds are very harmful for the ozone layer. 26. What is the impact of green house effect? Ans. All pollutants like carbon dioxide, CFCs, methane are liberated in the atmosphere. These gases are called green house gases as they allow radiation to pass through them. They absorb these radiation and irradiate the heat back to Earth and cause green house effect. 27. What is global warming? Ans. Global warming is the increase in the earth s surface temperature. It is due to rise in the level of green house gases. Due to global warming, there will be gradual rise in the sea level caused by melting of snow caps adding more water to the sea and cause floods on coastal areas. **** Biology Class VI 17 Question Bank

OUR ENVIRONMENT VERY SHORT ANSWER TYPE QUESTIONS

OUR ENVIRONMENT VERY SHORT ANSWER TYPE QUESTIONS [1 Mark] 1. What will happen if we kill all the organisms in one trophic level? Answer. If we kill all the organisms in one trophic level, the following