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When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings? (a) Stomata (b) Lamina (c) Midrib (d) Veins

a) Stomata Explanation Stomata are the tiny openings present on the epidermis of leaves. We can see stomata under the... View Article

The term that is used for the mode of nutrition in yeast, mushroom and bread-mould is (a) autotrophic (b) insectivorous (c) saprophytic (d) parasitic

c) Saprophytic Explanation In saprotrophic mode of nutrition, the vital nutrients required for their body are collected from dead and... View Article

Pitcher plant traps insects because it (a) is a heterotroph. (b) grows in soils which lack nitrogen. (c) does not have chlorophyll. (d) has a digestive system like human beings.

(b) grows in soils which lack nitrogen. Explanation Pitcher plants trap insects in its modified trap-like organ to fulfil its... View Article

Which of the following statements is/are correct? (i) All green plants can prepare their own food. (ii) Most animals are autotrophs. (iii) Carbon dioxide is not required for photosynthesis. (iv) Oxygen is liberated during photosynthesis. Choose the correct answer from the options below: (a) (i) and (iv) (b) (ii) only (c) (ii) and (iii) (d) (i) and (ii)

a) (i) and (iv) Explanation All green plants can prepare their own food by the process called photosynthesis. Carbon dioxide... View Article

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 Explanation Autotrophs are producers which prepare their own food. These can be classified as photoautotrophs and chemoautotrophs. They obtain... 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 Explanation The green pigment that presents in plant’s leaves is termed as “Chlorophyll”. In the leaves, chlorophyll absorbs... 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... 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... 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... 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... 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,... 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... 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.... 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... 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 imparted. Remember... 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... 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... 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... 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) Explanation It is important to make small check dams across the flooded gullies because they recharge... View Article

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