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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 Explanation As the population is growing rapidly, we require more food to feed the population. Agricultural... 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) Explanation Poultry farming refers to the rearing of domesticated fowl (birds) for their meat and eggs.... 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 Explanation Atmosphere is a protective layer of gases that shelters all life... View Article

A lot of dry leaves are collected in a school garden and are burnt every day. Do you think that it is right to do so? If not, what should be done to dispose off the dry leaves?

It is not right to burn dry leaves as it causes air pollution. The right way to dispose off the... View Article

Match the following A and B (A) – (B) (a) Smooth endoplasmic reticulum – (i) Amoeba (b) Lysosome – (ii) Nucleus (c) Nucleoid – (iii) Bacteria (d) Food vacuoles – (iv) Detoxification (e) Chromatin material – (v) Suicidal bag and nucleolus

Column-I Column-II A. Smooth endoplasmic 4. Detoxification B. Lysosome 5. Suicidal bag C. Nucleoid 3. Bacteria D. Food vacuoles 1.... View Article

Majority of cells cannot be seen directly with our naked eyes because: (a) organisms are generally unicellular (b) cells are microscopic (c) cells are present only inside the body (d) cells are grouped into tissues

b) Cells are microscopic. The majority of the cells cannot be seen directly with our naked eyes because cells are... View Article

If a person’s clothes catch fire, the best way to extinguish the fire is to: (a) throw water on the clothes. (b) use the fire extinguisher. (c) cover the person with a woollen blanket. (d) cover the person with a polythene sheet.

(c) cover the person with a woolen blanket. If a person’s clothes catch fire, the best way to extinguish the... View Article

Select the incorrect sentence (a) Blood has matrix containing proteins, salts and hormones (b) Two bones are connected with ligament (c) Tendons are non-fibrous tissue and fragile (d) Cartilage is a form of connective tissue

(c) Tendons are non-fibrous tissue and fragile A tendon is a tough fibrous connective tissue that connects muscle to bone.... View Article

Select the correct statement (a) Heterotrophs do not synthesise their own food (b) Heterotrophs utilise solar energy for photosynthesis (c) Heterotrophs synthesise their own food (d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

(a) Heterotrophs do not synthesize their own food Explanation Heterotrophs are those organisms which cannot make their own food from... View Article

A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.) would correctly represent the change in its temperature as a function of time.

Graph (a) is the right answer because water will cool initially until its temperature reaches 0 °C. After reaching the... View Article

While doing work and running, you move your organs like hands, legs etc. Which among the following is correct? (a) Smooth muscles contract and pull the ligament to move the bones (b) Smooth muscles contract and pull the tendons to move the bones (c) Skeletal muscles contract and pull the ligament to move the bones (d) Skeletal muscles contract and pull the tendon to move the bones

d) Skeletal muscles contract and pull the tendon to move the bones Skeletal muscles are striped, voluntary muscles, due to... View Article

The shape of guard cells changes due to change in the (a) protein composition of cells (b) temperature of cells (c) amount of water in cells (d) position of the nucleus in the cells

(c) amount of water in cells Explanation Guard cells are cells surrounding each stroma. They help to regulate the rate... View Article

Beera wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen. Which crop replenishes nitrogen and why?

Rabi crops are pea, wheat, mustard whereas kharif crops are paddy, maize, soybean. These crops require different climatic conditions and... View Article

An increase in carbon dioxide content in the atmosphere would not cause (a) more heat to be retained by the environment (b) increase in photosynthesis in plants (c) global warming (d) abundance of desert plants

d) Abundance of desert plants Explanation When the carbon dioxide is increasing it increases the earth temperature. The increase in... View Article

Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to: (a) proper combustion of fuel. (b) improper cooking of potato curry. (c) improper combustion of the fuel. (d) burning of the copper vessel.

(c) improper combustion of the fuel. A reaction or process which entails only partial burning of a fuel. This may... View Article

Which of the following statements about the autotrophs is incorrect? (a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll (b) They store carbohydrates in the form of starch (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight (d) They constitute the first trophic level in food chains

c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight. Explanation Autotrophs can convert carbon dioxide... View Article

When air is blown from the mouth into a test-tube containing lime water, the lime water turned milky due to the presence of (a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapour

b) Carbon dioxide Explanation Carbon dioxide gas turns lime water milky. When air is blown from the mouth into a... View Article

Many are responsible for causing pollution. Petroleum are a major source of pollutants like and . (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).

Many Industries are responsible for causing air pollution. Petroleum refineries are a major source of gaseous pollutants like sulphur dioxide... View Article

Boojho wants to separate the following materials as combustible and non-combustible. Can you help him? Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, wood.

(a) Combustible substances — charcoal, straw, card board, paper, candle wood, (b) Non-combustible substances — chalk, stone, iron rod, copper... View Article

Plastic is used for making a large variety of articles of daily use and these articles are very attractive. But it is advised to avoid the use of plastic as far as possible. Why?

Most plastics are non – biodegradable, mainly because plastic is widely used because of its low cost, versatility and durability.... View Article

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