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Organisms which prepare food for themselves using simple naturally available raw materials are referred to as (a) heterotrophs (b) autotrophs (c) parasites (d) saprophytes

b) Autotrophs Autotrophs are producers which prepare their own food. These can be classified as photoautotrophs and chemoautotrophs. They... View Article

In the absence of which of the following will photosynthesis not occur in leaves? (a) Guard cells (b) Chlorophyll (c) Vacuole (d) Space between cells

b) Chlorophyll The green pigment that presents in plant's leaves is termed as “Chlorophyll”. In the leaves, chlorophyll absorbs energy from the... View Article

Why are the Arabari forests of Bengal known to be a good example of conserved forest?

Arabari forests are a good example of conserved forest because local people were involved in conservation programmed to conserve the Arabari... View Article

What is the importance of the forest as a resource?

Forests help in maintaining the temperature and oxygen level of the atmosphere. Plants release oxygen during photosynthesis and consume carbon... View Article

Suggest a few useful ways of utilising wastewater.

Waste water can be used for the following ways: For recharging the ground water. Can be used for irrigation. Treated municipal water can be used... View Article

Is water conservation necessary? Give reasons.

Water conservation is very important as it is very important factor for the existence of life. Water distribution is uneven and large... View Article

Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilisation can be minimised.

Natural resources are the parts of the environment that are highly important to humans, whether they in one form or the other. Natural resources... View Article

In the context of conservation of natural resources, explain the terms reduce, recycle and reuse. From among the materials that we use in daily life, identify two materials for each category.

Reduce - Electricity and water Recycle - Plastic cups, paper, and metal objects Reuse - Used envelopes, plastic carry bags, and bottles of jam... View Article

(i) Locate and name the water reservoirs in Figures (a) and (b). (ii) Which has an advantage over the other and why?

Figures16.1 (a) is a pond ecosystem and Figures16.1 (b) is an underground waterbody Groundwater body has more advantages than the pond... View Article

Suggest a few measures for controlling carbon dioxide levels in the atmosphere.

Carbon dioxide is a chemical element that can be found in the atmosphere. At room temperature, it is a gas. It has one carbon atom and two oxygen... View Article

Although coal and petroleum are produced by degradation of biomass, yet we need to conserve them. Why?

Coal and petroleum have been produced from large amounts of biomass entrapped inside the earth under high temperature, pressure and anaerobic... View Article

What measures would you take to conserve electricity in your house?

Conservation of electricity is important nowadays. To reduce the environmental impact on society, energy conservation measures are being... View Article

In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers. Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.

Eutrophication is the process in which a water body becomes overly enriched with nutrients, leading to plentiful growth of simple plant life. The... View Article

List two advantages associated with water harvesting at the community level.

Water harvesting improves the quality of ground water. There stored water provides moisture and helps in improving vegetation in and around... View Article

Prepare a list of five items that you use daily in the school. Identify from the list such items that can be recycled.

Paper, rexine bag, blade, pen, plastic box, scale, eraser, compass and dividers (metallic), steel lunch box and steel spoon are used in the... View Article

It is important to make small check dams across the flooded gullies because they (i) hold water for irrigation (ii) hold water and prevent soil erosion (iii) recharge groundwater (iv) hold water permanently (a) (i) and (iv) (b) (ii) and (iii) (c) (iii) and (iv) (d) (ii) and (iv)

(b) (ii) and (iii) It is important to make small check dams across the flooded gullies because they recharge groundwater. These small dams... View Article

Select the eco-friendly activity among the following (a) Using a car for transportation (b) Using polybags for shopping (c) Using dyes for colouring clothes d) Using windmills to generate power for irrigation

d) Using windmills to generate power for irrigation Windmill is used in the generation of power by converting wind energy into mechanical... View Article

Pick the right combination of terms which has no fossil fuel. (a) Wind, ocean and coal (b) Kerosene, wind and tide (c) Wind, wood, sun (d) Petroleum, wood, sun

c) Wind, wood and sun In above question, Coal, Kerosene and Petroleum comes under fossil fuels.Fossil fuels are the fuels formed by... View Article

Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for (a) grain storage (b) wood storage (c) water harvesting (d) soil conservation

c) Water harvesting Water harvesting is an age-old concept in India and is practised in India from years. Khadin structures are practised... View Article

Opposition to the construction of large dams is due to (a) social reasons (b) economic reasons (c) environmental reasons (d) all the above

d) All of the above Construction of large dams will lead to dislocation of people from that place, submerging of flora and fauna.... View Article

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