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For some integer q, every odd integer is of the form (A) q (B) q +1 (C) 2g (D) 2q +1

Solution: (D) 2q+1 option (D) is the correct answer. Explanation: Odd integers are the integers that are not divisible by 2. Hence,... View Article

For some integer m, every even integer is of the form: (A) m (B) m +1 (C) 2m (D) 2m+1

Solution: (C)2m option (C) is the correct answer. Explanation: Even integers are the integers that are divisible by 2. Hence, we... View Article

Explain some harmful effects of agricultural practices on the environment.

Answer A few of the harmful effects of agricultural practices on the environment are listed below Climate Change: Farming encourages... View Article

What are the by-products of fertiliser industries? How do they affect the environment?

Answer The most common byproduct of fertilizer industries are oxides of nitrogen and sulphur. They move into the atmosphere and spread to all... View Article

Suggest suitable mechanism (s) for waste management in fertiliser industries.

Answer To manage waste in the fertiliser industry following steps must be taken: • For control of gaseous pollutants combustion equipment... View Article

Name the wastes which are generated in your house daily. What measures would you take for their disposal?

Answer Waste that is generated daily Measures to take to dispose of house waste are Kitchen waste like fruits and vegetable peels... View Article

Suggest any four activities in daily life which are eco-friendly

Answer Activities in daily life that are eco-friendly are listed below Walking or cycling for short distances Turning off fans and... View Article

What are decomposers? What will be the consequence of their absence in an ecosystem?

Answer Decomposers are micro-organisms that digest things that are dead or decaying and turn the dead plants and animals into humus. The... View Article

Indicate the flow of energy in an ecosystem. Why is it unidirectional Justify.

Answer The energy flow in the ecosystem is one of the significant factors that promote the survival of such a great number of organisms. For... View Article

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

Answer Ponds and lakes are natural ecosystems and they contain decomposers. Decomposers act as cleansing agents here, whereas an aquarium is an... View Article

Select the mismatched pair in the following and correct it. (a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain (b) Ecosystem — Biotic components of environment (c) Aquarium — A man-made ecosystem (d) Parasites — Organisms which obtain food from other living organisms

(a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain (b) Ecosystem — Biotic components... View Article

Suggest one word for each of the following statements/ definitions (a) The physical and biological world where we live in (b) Each level of the food chain where the transfer of energy takes place (c) The physical factors like temperature, rainfall, wind and soil of an ecosystem (d) Organisms which depend on the producers either directly or indirectly for food

Answer (a) The physical and biological world where we live in Environment An Environment is everything that is around us, which includes both... View Article

Why are crop fields known as artificial ecosystems?

Answer Crops fields are known as artificial ecosystems because they are manmade where certain biotic and abiotic components are... View Article

What are the advantages of cloth bags over plastic bags during shopping?

Answer Advantages of cloth bags over plastic bags during shopping are listed below: Cloth bags can sustain more weight than plastic bags Cloth... View Article

Write the common food chain of a pond ecosystem.

The common food chain of pond ecosystem is Phyto plankton ↓ Small aquatic animals larvae, shrimps, Insects ↓ Fish ↓ Bird... View Article

Why is improper disposal of waste a curse to the environment?

Improper disposal of waste is a curse to the environment due to the following reasons Due to improper disposal of the collected wastes gets... View Article

Disposable plastic plates should not be used because (a) they are made of materials with lightweight (b) they are made of toxic materials (c) they are made of biodegradable materials (d) they are made of non-biodegradable materials

The answer is (d) they are made of non-biodegradable materials Explanation: Plastics are non-biodegradable hence they start accumulating in... View Article

If a grasshopper is eaten by a frog, then the energy transfer will be from (a) producer to decomposer (b) producer to primary consumer (c) primary consumer to secondary consumer (d) secondary consumer to primary consumer

The answer is (c) primary consumer to secondary consumer Explanation: Grasshopper is a primary consumer because it feeds on grass. If a... View Article

The decomposers in an ecosystem (a) convert inorganic material, to simpler forms (b) convert organic material to inorganic forms (c) convert inorganic materials into organic compounds (d) do not breakdown organic compounds

The answer is (b) convert organic material to inorganic forms Decomposers are micro-organisms that digest things that are dead or decaying... View Article

What will happen if deer is missing in the food chain given below? Grass → Deer → Tiger (a) The population of tiger increases (b) The population of grass decreases (c) Tiger will start eating grass (d) The population of tiger decreases and the population of grass increases

The answer is (d) The population of tigers decreases and the population of grass increases. Explanation: Lack of predators will increase the... View Article

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