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You are aware of Polio Eradication Programme in your city. Children are vaccinated because (a) vaccination kills the polio causing microorganisms (b) prevents the entry of polio causing organism (c) it creates immunity in the body (d) all the above

c) It creates immunity in the body A vaccine is a preparation that improves immunity to a particular disease. It is a biologically... View Article

Identify the statement which is true for cells. (a) Cells can be easily seen with naked eyes. (b) Insect’s egg is not a cell. (c) A single cell can perform all the functions in a unicellular organism. (d) The size and shape of cells is uniform in multicellular organisms

c) A single cell can perform all the functions in an unicellular organism. Cells are called as the structural and functional unit of life... View Article

When a person is suffering from severe cold, he or she cannot (a) differentiate the taste of an apple from that of an ice cream (b) differentiate the smell of a perfume from that of an agarbatti (c) differentiate red light from green light (d) differentiate a hot object from a cold object

b) Differentiate the smell of a perfume from that of an agarbatti Cold or common cold is a disease diagnosed with a headache, runny nose,... View Article

Salma had a very soft and smooth skin during her childhood. As she entered adolescence, she developed pimples on her face. The skin specialist advised her to wash her face at regular intervals. Can you explain the reasons for the appearance of pimples on her face and suggest ways to prevent them?

After adolescence sweat glands and sebaceous glands increase their secretion. Pimples on Salma's face were the result of the increase in... View Article

About 300 million years ago the earth had dense in low lying wetland areas. Due to natural processes, like , these forests got burried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. Under high and high __, dead plants got slowly converted into coal.

About 300 million years ago, the earth had dense forests in low-lying wetland areas. Due to natural processes, like a floods, these forests got... View Article

What would happen if poultry birds are larger in size and have no summer adaptation capacity? In order to get small sized poultry birds, having summer adaptability, what method will be employed?

Maintenance of temperature is needed for better egg production by poultry birds. Therefore, larger size (increase in surface area of body) and no... View Article

Which one of the following is not important for individual health? (a) Living in clean space (b) Good economic condition (c) Social equality and harmony (d) Living in a large and well furnished house

d) Living in a large and well furnished house Living in a large and well-furnished house is not guaranteed for healthy living. In fact, people... View Article

Air is a natural resource and cannot be exhausted by human activities. It is known as an inexhaustible natural resource. Which of the following is another inexhaustible natural resource? (a) coal (b) petroleum (c) sun-light (d) minerals

(c)Sunlight Sunlight, air and water are inexhaustible natural resources that means which cannot be exhausted by human activities. Exhaustible... View Article

Which of the following statement is not true for organic manure? (a) It enhances the water holding capacity of the soil. (b) It has a balance of all plant nutrients. (c) It provides humus to the soil. (d) It improves the texture of the soil.

It has a balance of all plant nutrients Manure is an organic substance produced by the decomposition of plant and animal wastes in the presence... View Article

Fill in the blanks (a) ———are forms of complex tissue. (b) ———have guard cells. (c) Cells of cork contain a chemical called——— (d) Husk of coconut is made of ———tissue. (e) ———gives flexibility in plants. (f) ———and———are both conducting tissues. (g) Xylem transports———and———from soil. (h) Phloem transport———from———to other parts of the plant

(a) Xylem and phloem Xylem and Phloem are two different types of vascular tissues, which are mainly involved in the transportation process.... View Article

Which one of the following statements is true about a Biosphere Reserve? (a) It is a protected area where only endemic species live. (b) It is meant only for the conservation of plants and animals. (c) It is meant to conserve both the biodiversity and the culture of that area. (d) There are no other protected areas within its limits.

c) It is meant to conserve both, the biodiversity and the culture of that area. Biosphere reserves are areas of terrestrial and coastal or marine... View Article

Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following. (a) The animals are small in size and want to produce more offsprings. (b) Food is available is plenty of water. (c) To ensure a better chance of fertilisation. (d) Water promotes the production of a large number of gametes.

c) To ensure better chance of fertilisation. The external fertilisation is the process of fusion of male and female gametes outside the body or... View Article

Draw a plant cell and label the parts which (a) determines the function and development of the cell (b) packages materials coming from the endoplasmic reticulum (c) provides resistance to microbes to withstand hypotonic external media without bursting (d) is site for many biochemical reactions necessary to sustain life. (e) is a fluid contained inside the nucleus

(a) Nucleus: It determines the function and development of the cell (b) Golgi apparatus: It packages materials coming from the endoplasmic... View Article

Which of the following statement (s) is (are) true about the heart? (i) The left atrium receives oxygenated blood from different parts of the body while the right atrium receives deoxygenated blood from lungs (ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs (iii) Left atrium transfers oxygenated blood to the right ventricle which sends it to different body parts (iv) The right atrium receives deoxygenated blood from different parts of the body while the left ventricle pumps oxygenated blood to different parts of the body (a) (i) (b) (ii) (c) (ii) and (iv) (d) (i) and (iii)

b) The left ventricle pumps oxygenated blood to different body parts, while right ventricle pumps deoxygenated blood to lungs. The right... View Article

Animal husbandry is the scientific management of (i) animal breeding (ii) culture of animals (iii) animal livestock (iv) rearing of animals (a) (i), (ii) and (iii) (b) (ii), (iii) and (iv) (c) (i), (ii) and (iv) (d) (i), (iii) and (iv)

d) (i), (iii) and (iv) Animal husbandry is the science of caring and breeding of domestic animals and the development of genetic traits such as... View Article

Group the following and tabulate them as energy-yielding, protein yielding, oil yielding and fodder crop. Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudangrass, lentil, soybean, groundnut, castor and mustard.

Crops are plants grown by the farmers. Agriculture plays a very important role in the Indian economy. It is the backbone of our country. (1)... View Article

Match the microorganisms given in Column A to the group to which they belong in Column B. Column A – Column B (a) Lactobacillus – (i) Algae (b) Aspergillus – (ii) Protozoa (c) Spirogyra – (iii) Fungi (d) Paramecium – (iv) Bacteria

Column A Column B (a) Lactobacillus (iv) Bacteria (b) Aspergillus (iii) Fungi (c) Spirogyra (i) Algae (d) Paramecium (ii)... View Article

In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to (a) soil erosion (b) soil conservation (c) soil pollution (d) soil fertility

a) Soil erosion In this process, the soil particles are loosened or washed away in the valleys, oceans, rivers, streams or far away lands. This... View Article

Ozone-layer is getting depleted because of (a) excessive use of automobiles (b) excessive formation of industrial units (c) excessive use of man-made compounds containing both fluorine and chlorine (d) excessive deforestation.

c) excessive use of man-made compounds containing both fluorine and chlorine Ozone-layer is getting depleted because of excessive use of... View Article

Paheli watched her grandmother making mango pickle. After she bottled the pickle, her grandmother poured oil on top of the pickle before closing the lid. Paheli wanted to know why oil was poured? Can you help her understand why?

The oil poured on the pickles forms a layer of protection between air and pickle from the bacteria present in the air. This increases the shelf... View Article

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