01 Scf Cbse x Bmt 1 Our Environment Qp 2

SCF-CBSE-X-OUR ENVIRONMENT-BMT-01

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Time: 1Hr SCF-CBSE-X-BIOLOGY OUR ENVIRONMENT

Maximum Marks: 26

INSTRUCTIONS: 1. All the questions are compulsory. 2. The question paper consists of 16 questions and are divided into 4 sections, A, B ,C and D. 3. Question numbers 1 to 6 are in section A and are multiple choice questions. Where you need to select one correct option out of the given four. 4. Question numbers 7 to 10 are in section B and are Very Short Answer Type Questions. 5. Question numbers 11 to 14 are in section C and are Short Answer Type Questions. 6. Question numbers 15 & 16 are in section D and are Long Answer Type Questions. 7. Use of calculators are not permitted.

SECTION-A

1. O2 is converted into O3 by the action of

1) Infrared radiations 2) Ultraviolet radiations

3) Gamma radiations 4) Cosmic radiations

2. Which of the statement is incorrect?

1) All green plants and blue green algae are producers

2) Green plants get their food from organic compounds

3) Producers prepare their own food from inorganic compounds

4) Plants convert solar energy into chemical energy

3. Which of the following is not an example of prey predator food chain?

1) Seeds rodents fox tiger

2) Green plants deer tiger

3) Grass grasshopper lizard hawk

4) Mangrove shed leaves detritus shrimps small fish

4. Nowadays, which type of cups are being generally used in trains for serving tea/coffee/soup etc. on daily basis?

1) Washable glass cups 2) Washable plastic cups

3) Disposable paper cups 4) Disposable cups made of clay

5. Montreal protocol is related to

1) Persistent organic farming 2) Global warming and climate change

3) Substances that depletes ozone layer 4) Bio safety of genetically modified organisms

SCF-CBSE-X-OUR ENVIRONMENT-BMT-01

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6. The acidity of rainwater can be reduced by

1) Using lead free fuels in automobiles

2) Reducing the use of chlorofluorocarbons in refrigerators and air conditioners

3) Use of sulphur free or low sulphur fuel in automobiles

4) None of the above

SECTION-B

VERY SHORT ANSWER QUESTIONS (1mark)

7. List any two methods of garbage disposal.

8. Give two characteristics of food web?

9. Which one of the following food habits is better and why?

(a) Plant Man (b) Plant Goat Man

10. What is the ultimate source of energy for organisms?

SECTION-C

SHORT ANSWER QUESTIONS (2marks)

11. Although coal contains lot of carbon just like our most of foods. Why we will not get any energy, if we try to eat coal?

12. Differentiate between Natural and Artificial Ecosystem?

13. Mention the differences between food habits of organisms belonging to the first and third trophic level. Give one example of each of them.

14. What is global warming? Discuss the reasons of global warming. What are the factors contributing to it?

SECTION-D

LONG ANSWER QUESTIONS (4marks)

15. Consider the following food chain: Grass Mice Snakes Peacocks If in this chain, 100J of energy is available at the producer level, then calculate the energy transferred to the peacocks as

food. State the law used in the calculations.

16. What is ecological pyramid? Discuss different types of ecological pyramid.

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