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Endoskeleton of fishes are made up of cartilage and bone; classify the following fishes as cartilaginous or bony Torpedo, Sting ray, Dogfish, Rohu, Angler fish, Exocoetus

Cartilaginous fishes have skeletons composed mostly of cartilage while bony fish have a skeleton composed mostly of bone. Furthermore, these... View Article

A physical process in which a substance reacts with oxygen to give off heat is called combustion. (True or False). Also write the false statements in their correct form.

False – A chemical process in which a substance reacts with oxygen to give off heat is called combustion. Combustion... View Article

The proteins and lipids, essential for building the cell membrane, are manufactured by (a) rough endoplasmic reticulum (b) golgi apparatus (c) plasma membrane (d) mitochondria

a) Endoplasmic reticulum Explanation The endoplasmic reticulum is of two types on the basis of the presence of ribosomes. If... View Article

Choose the correct path of urine in our body (a) kidney → ureter → urethra → urinary bladder (b) kidney → urinary bladder → urethra → ureter (c) kidney → ureters → urinary bladder → urethra (d) urinary bladder → kidney → ureter → urethra

(c) Kidney →ureter→ urinary bladder →urethra Explanation Kidneys are bean-shaped structures located on either side of the backbone and are... View Article

Fill in the blanks (a) A total ofnutrients are essential to plants. (b) andare supplied by air to plants. (c) is supplied by water to plants. (d) Soil supplynutrients to plants. (e) nutrients are required in large quantity and called. (f) nutrients are needed in small quantity for plants and are called ____.

(a) 16. Nitrogen (N), Phosphorus (P), and Potassium (K), Calcium (Ca), Magnesium (Mg), and Sulfur (S), Boron (B), Chlorine (CI),... View Article

Choose the wrong statement (a) The nature of matrix differs according to the function of the tissue (b) Fats are stored below the skin and in between the internal organs (c) Epithelial tissues have intercellular spaces between them (d) Cells of striated muscles are multinucleate and unbranched

c) Epithelial tissues have intercellular spaces. The nature of matrix differs according to the function of the tissue. Epithelial tissue... View Article

Find out the wrong statement from the following (a) White revolution is meant for increase in milk production (b) Blue revolution is meant for increase in fish production (c) Increasing food production without compromising with environmental quality is called as sustainable agriculture (d) None of the above

a) White revolution is meant for increase in milk production Explanation The White Revolution in India helped in reducing malpractice... View Article

Which of the following statement(s) is (are) correct? (i) Pyruvate can be converted into ethanol and carbon dioxide by yeast (ii) Fermentation takes place in aerobic bacteria (iii) Fermentation takes place in mitochondria (iv) Fermentation is a form of anaerobic respiration (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (iv) (d) (ii) and (iii)

c) (i) and (iv) Explanation The respiration process can be aerobic or anaerobic. Aerobic respiration occurs in presence of oxygen... View Article

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 Explanation Earth absorb radiation from sun, and then try to transmit it back to... 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... 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. Explanation Trypsin is an enzyme that helps us digest protein. In the... 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... 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. Explanation The most conspicuous change during puberty is the sudden increase in height. At this time... 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... 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 Explanation The ozone layer is found in the lower portion of the earth’s atmosphere.... 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... 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... 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... 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... View Article

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