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(b) coke
Coke is a secondary fuel.

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(a) SO2
Burning of coal and diesel releases sulphur dioxide gas (SO2) in the atmosphere. The oxides of sulphur dissolve in rainwater and this results in acid rain.

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(c) 1973
The Project Tiger Conservation Programme was initiated in 1973 to save tiger population from extinction in India.

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(b) 10-10 m
One angstrom is equal to 10-10 m.

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(a) reptiles
Reptiles are unisexual.

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1. Substances which burn easily called combustible substances.
2. CCl4 fire extinguisher is used to extinguish fire caused by electricity.
3. Wildlife protection act was passed by government of India in 1972.
4. A cell can be defined as smallest structural and functional unit of life.
5. Each ovary produces one mature ovum every month.

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Column A Column B
1. SPM (b) Smog
2. Greenhouse effect (d) Global warming
3. Eels (a) Migratory animal
4. RNA (e) Ribonucleic acid
5. Testtube babies (c) In vitro fertilisation

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1. True.
2. False.
Water cannot be used to put off fire in electrical wiring because normal water can conduct electricity and may cause electrocution to the person trying to extinguish the fire.
4. False.
Robert Hooke discovered the cell in 1665.
5. True.



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1. Combustible substance should be present.
2. Supporter of combustion such as air or oxygen should be present.
3. Combustible substance must attain its ignition temperature or kindling temperature.

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The lowest temperature at which a substance catches fire and starts burning is known as its ignition or kindling temperature.

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It is unethical to destroy wildlife because just like us wildlife is also a part of nature and has life. It is as much a part of nature as human beings. In fact, human beings are no different from wildlife if we look at the ecosystem as a whole because we all are dependent on wildlife directly or indirectly for our food and other requirements. Also, destruction of wildlife would mean unbalancing the complex ecosystems around us, which would finally affect us adversely. 

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Cell is the structural and functional unit of all living beings. A cell is the smallest structure of a living organism that is capable of independent existence. Thus it forms the simplest and smallest unit of life. It is the most fundamental structure that builds up to form complex structures such as tissues and organs, which, in turn, form organ systems. That is why it is said that a cell is the building block of life. 

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Gestation is the time period starting from fertilisation of egg or ovum by the sperm till the birth of the infant.

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Principles used in putting out fire:

1. All combustible substances should be removed from around the place of fire.
2. Supply of supporter of combustion should be ceased.
3. The substance should be cooled below its ignition temperature.

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Measures to protect and preserve endangered species in India:

(a) Declaring wild areas as wildlife sanctuaries and national parks so as to protect endangered species in their natural habitat.

(b) Reduction of the use of products obtained from wild plants and animals.

(c) Restoration of streams, rivers, ponds and other water bodies in their natural conditions.

(d) Protection of migratory birds by marking out the migratory route.

(e) Educating people to understand the need for protecting wildlife.

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Plant cell Animal cell
Cell wall is present. Cell wall is absent.
Plastids are present. Plastids are absent.
Centrosome is absent. Centrosome is present.
Lysosomes are absent. Lysosomes are present.

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Binary fission is the process of division of a mature parent cell into two identical daughter cells. It is a type of asexual reproduction. Amoeba is an example of organisms that reproduce by binary fission. The process of binary fission involves division of the nucleus into two identical daughter nuclei followed by division of the cytoplasm of the parent. This leads to the formation of two new identical cells, each containing a nucleus. 



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