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If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected? (a) Proteins breaking down into amino acids (b) Starch breaking down into sugars (c) Fats breaking down into fatty acids and glycerol (d) Absorption of vitamins

b) Starch breaking down into sugars Explanation Amylase is the enzyme that catalyses the hydrolysis of starch into simple sugars.... View Article

Find out the false statement (a) Aves are warm-blooded, egg laying and have a four-chambered heart (b) Aves have feather-covered body, forelimbs are modified into wings and breathe through lungs (c) Most of the mammals are viviparous (d) Fishes, amphibians and reptiles are oviparous

d) Fishes, amphibians and reptiles are oviparous. Explanation There are a few fishes, amphibians and reptiles which are viviparous. Sharks,... View Article

Which of the following statements is correct about receptors? (a) Gustatory receptors detect taste while olfactory receptors detect smell (b) Both gustatory and olfactory receptors detect smell (c) Auditory receptors detect smell and olfactory receptors detect taste (d) Olfactory receptors detect taste and gustatory receptors smell

a) Gustatory receptors detect taste while olfactory receptors detect smell Explanation Gustatory receptors are present in the taste buds present... View Article

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains (a) complex proteins (b) simple proteins (c) fats (d) starch

d) Starch Explanation A solution of iodine and potassium is added to a starch-containing substance instead of molecular iodine because... View Article

In which of the following vertebrate group/groups, the heart does not pump oxygenated blood to different parts of the body?

(a) Pisces and amphibians (b) Amphibians and reptiles (c) Amphibians only (d) Pisces only Answer: d) Pisces only Explanation: In... View Article

A person met with an accident in which two long bones of hand were dislocated. Which among the following may be the possible reason? (a) Tendon break (b) Break of skeletal muscle (c) Ligament break (d) Areolar tissue break

(c) Ligament break The two long bones in hand are the radius and the ulna. Annular ligament or orbicular ligament is... View Article

What happens when rain falls on soil without vegetational cover? (a) Rainwater percolates in soil efficiently (b) Rainwater causes loss of surface soil c) Rainwater leads to fertility of the soil (d) Rainwater does not cause any change in soil

(b) Rainwater causes loss of surface soil Explanation When the soil is without vegetation cover, the rainwater carries away the... View Article

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 Explanation A vaccine is a preparation that improves immunity to a particular disease.... 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... 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 Explanation Cold or common cold is a disease... 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... 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... 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... 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 Explanation Living in a large and well-furnished house is not guaranteed... 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 resources... 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... 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... 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... 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... 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... View Article

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