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Which step is not involved in the carbon cycle? (a) Photosynthesis (b) Transpiration (c) Respiration (d) Burning of fossil fuels

B) Transpiration Explanation The major steps involved in the process of the carbon cycle: Carbon present in the atmosphere is absorbed... View Article

Why is it advised that industries should switch over to cleaner fuels such as CNG and LPG in the Taj Mahal Zone in Agra?

It is advised that industries around the Taj Mahal should switch over to cleaner fuels such as CNG and LPG... View Article

Calorific value of wood is higher than that of coal (True or False). Also write the false statements in their correct form.

False Coal has a higher calorific value as compared to wood. Hence, the given statement is ‘False’. It is a measure... View Article

The term used for the process of separation of grains from the chaff is (a) Sieving (b) Threshing (c) Winnowing (d) handpicking

c) winnowing Wind winnowing is method developed by ancient cultures for separating grains from chaff. It is also used to... View Article

In taxonomic hierarchy family comes between (a) Class and Order (b) Order and Genus (c) Genus and Species (d) Division and Class

b) Order and Genus Explanation In biological classification, living organisms are arranged in taxonomic ranks in a hierarchy ascending as follows;... View Article

Parenchyma cells are (a) relatively unspecified and thin-walled (b) thick-walled and specialised (c) lignified (d) none of these

The correct answer is (a) relatively unspecified and thin-walled Parenchyma cells are notable for their thin walls, and for being alive... View Article

Soil erosion can be prevented by (a) raising forests (b) deforestation (c) excessive use of fertilizer (d) overgrazing by animals

a) Raising forests Explanation Soil erosion is a continuous process that occurs either slowly or at an alarming rate. It... View Article

Bone matrix is rich in (a) fluoride and calcium (b) calcium and phosphorus (c) calcium and potassium (d) phosphorus and potassium

b) Calcium and phosphorus The bone matrix contains bone minerals also known as hydroxyapatite, which consists of mainly calcium and... View Article

Chlorination is a commonly used chemical method for killing germs in water. State true or false. Correct if wrong statement.

True. Chlorination is a commonly used chemical method for killing germs in water. Explanation Chlorine kills pathogens such as bacteria... View Article

Petroleum was formed from organisms: (a) living on the land (b) living on the plants (c) living in the sea (d) living on the rocks

(c) living in the sea Petroleum is formed from dead organic matter. When a large amount of dead organism, usually... View Article

Which of the following non-metals reacts and catches fire on exposure to air? (a) Phosphorus (b) Nitrogen (c) Sulphur (d) Hydrogen

Phosphorus White phosphorous is an allotropic form of phosphorus with a low ignition temperature of 37degree Celsius and can catch... View Article

A purple coloured non-metal form a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.

Iodine Iodine is a non-metallic element with natural dark violet that plays a vital role in human metabolism. Iodine, for... View Article

In which part of the alimentary canal food is finally digested? (a) Stomach (b) Mouth cavity (c) Large intestine (d) Small intestine

d) Small intestine Explanation The food is finally digested in the small intestine of the alimentary canal because it has... View Article

If there is low rainfall in a village throughout the year, what measures will you suggest to the farmers for better cropping?

Irrigation help to overcome the problem of low rainfall and helps to increase productivity by maintaining soil-water balance. Farmers should... View Article

Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.

Epithelial cells are the thin protective coverings that line most organs and cavities within the body. It also forms a... View Article

Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?

Answer: A complex network of tubular membranes specially present in the cytoplasm of the eukaryotic cell is called the endoplasmic... View Article

Name the chemicals which are used in refrigerators and air conditioners and damage the ozone layer when released in the air.

The chemicals used in refrigerators and air conditioners, which damage the ozone layer when released in the air, are called... View Article

Which of the following is not a source of air pollution? (a) automobile exhaust (b) burning of firewood (c) windmill (d) power plant

(c) windmill Windmill will not release any sort of gas into atmosphere hence it is not considered as a source... View Article

The size of the cells of an organism has no relation with the size of its body. Do you agree? Give the reason for your answer.

Yes. I agree to this. The cells in the body of an elephant is not necessarily bigger than those in... View Article

People usually keep Angethi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?

Burning of Angethi produces many harmful gases such as Carbon dioxide and Carbon monoxide etc. This also reduces the flow... View Article

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