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The atmosphere of the earth is heated by radiations which are mainly (a) radiated by the sun (b) re-radiated by land (c) re-radiated by water (d) re-radiated by land and water

d) re-radiated by land and water Earth absorb radiation from sun, and then try to transmit it back to atmosphere, but atmosphere absorb very... View Article

Fill in the blanks (a) Photoperiod affect the . (b) Kharif crops are cultivated from to . (c) Rabi crops are cultivated from to . (d) Paddy, maize, green gram and black gram are crops. (e) Wheat, gram, pea, mustard are crops.

(a) Flowering of plant Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals.... View Article

Terms related to the agricultural practice are given below. Rearrange them in the correct sequence. harvesting, sowing, manuring, tilling and ploughing, irrigation, de-weeding.

The correct sequence is tilling and ploughing, sowing, manuring, irrigation, de-weeding, harvesting. First, the soil is tilled and ploughed. Then... View Article

Choose the function of the pancreatic juice from the following (a) trypsin digests proteins and lipase carbohydrates (b) trypsin digests emulsified fats and lipase proteins (c) trypsin and lipase digest fats (d) trypsin digests proteins and lipase emulsified fats

d) Trypsin digests proteins and lipase hydrolyses fats. Trypsin is an enzyme that helps us digest protein. In the small intestine, trypsin... View Article

In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas (iv) Adding more hydrogen gas to the container without increasing the volume of the container (a) (i) and (iii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)

C) (ii) and (iii) Universal gas law states that PV=nRT Pressure is directly proportional to temperature and indirectly proportional to the volume... View Article

The most conspicuous visible change that occurs in boys during puberty is: (a) development in the voice box. (b) increase in height. (c) production of sperms. (d) increased sweating.

(b) increase in height. The most conspicuous change during puberty is the sudden increase in height. At this time the long bones, that is, the... View Article

Read the paragraph and answer the questions following it. Water is essential for life. Without water, there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called a point source, e.g.– municipal and industrial discharge pipes, where pollutants enter the water source. Non–point sources of pollution are those where a source of pollution can not be easily identified, e.g.– agricultural runoff, acid rain etc. 1) How do you classify the various sources of water pollution? 2) What are the point sources of water pollution? 3) Name any two non-point sources of water pollution?

(a) Various sources of water pollution are classified as point sources and non-point sources. (b) The sources or places of pollution which are... View Article

Ozone-hole means (a) a large sized hole in the ozone layer (b) thinning of the ozone layer (c) small holes scattered in the ozone layer (d) thickening of ozone in the ozone layer

b) thinning of the ozone layer The ozone layer is found in the lower portion of the earth’s atmosphere. It has the potential to absorb... View Article

Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is (a) nitrogen (b) oxygen (c) ozone (d) argon

b) Oxygen Most living things need oxygen to survive. Oxygen helps organisms grow, reproduce, and turn food into energy. Humans get the oxygen... View Article

Magnesium ribbon on burning in air produces: (a) magnesium oxide, water and light. (b) magnesium oxide and heat. (c) magnesium oxide, heat and light. (d) magnesium oxide, water and heat.

(c) magnesium oxide, heat and light When magnesium ribbon is burnt in the air, it combines with oxygen to form white powder magnesium oxide MgO... View Article

Which of the following property is not responsible for copper to be used as electrical conduction wires? (a) Ductility (b)Colour (c) Good conductor of electricity (d) It is solid

(b) Colour of the copper metal is not responsible for copper to be used as electrical conduction wires. All metals have some amount of... View Article

You are given leech, Nereis, Scolopendra, prawn and scorpion; and all have segmented body organisation. Will you classify them in one group? If no, give the important characters based on which you will separate these organisms into different groups.

The organisms mentioned in the question does not belong to same group. Leech and Nereis belong to phylum annelida because they have metamerically... View Article

Some words (underlined) in the following sentences are jumbled up. Write them in their correct form. (a) Seldie is a combustible substance. (b) Slags is a non-combustible material. (c) Chittsmack does not burn by itself. (d) Some substances on combustion produce thea and mafel. (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its Aricolci uelav.

(a) Diesel is a combustible substance. When a substance ;can burn in air and produce heat and light is known as a combustible substance. (b)... View Article

Find out the correct sentence 1) Hybridisation means crossing between genetically dissimilar plants 2) Cross between two varieties is called as inter specific hybridisation 3) Introducing genes of desired character into a plant gives genetically modified crop 4) Cross between plants of two species is called as inter varietal hybridisation (a) (i) and (iii) (b) (ii) and (iv) (c) (ii) and (iii) (d) (iii) and (iv)

A. (i) and (iii) The cross performed between two plants belonging to different species (having different characters) is referred to as... View Article

A long tree has several branches. The tissue that helps in the sideways conduction of water in the branches is (a) collenchyma (b) xylem parenchyma (c) parenchyma (d) xylem vessels

b) Xylem parenchyma Xylem parenchyma is an element of complex tissue called “Xylem”. Parenchyma cells of the xylem are mainly... View Article

Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think the survival of living beings would be possible.? If yes, why?, If not, why not?

If natural resources are not available, then the survival of the human beings would be impossible. Fossil fuels are an essential part of human... View Article

While returning from the school, Boojho ate chaat from a street hawker. When he reached home, he felt ill and complained of stomach ache and fell ill. What could be the reason?

The probable reason is that the chaat was contaminated by pathogenic microbes clue to unhygienic conditions near the shop or the utensil used for... View Article

To solve the food problem of the country, which among the following is necessary? (a) Increased production and storage of food grains (b) Easy access of people to the food grain (c) People should have money to purchase the grains (d) All of the above

All of the above As the population is growing rapidly, we require more food to feed the population. Agricultural scientists are looking for... View Article

Poultry farming is undertaken to raise following (i) Egg production (ii) Feather production (iii) Chicken meat (iv) Milk production (a) (i) and (iii) (b) (i) and (ii) (c) (ii) and (iii) (d) (iii) and (iv)

a) (i) and (iii) Poultry farming refers to the rearing of domesticated fowl (birds) for their meat and eggs. These birds include chicken,... View Article

If there were no atmosphere around the earth, the temperature of the earth will (a) increase (b) go on decreasing (c) increase during day and decrease during night (d) be unaffected

c) Increase during day and decrease during night Atmosphere is a protective layer of gases that shelters all life on Earth, keeping... View Article

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