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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 remove weevils or other... 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 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 at... 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 Soil erosion is a continuous process that occurs either slowly or at an alarming rate. It results in a continuous loss of... 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 phosphorus... 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. Chlorine kills pathogens such as bacteria and viruses by... 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 zooplankton and algae are... 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 fire easily... 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 example, is slightly... 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 The food is finally digested in the small intestine of the alimentary canal because it has all the enzymes needed for the... 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 use... 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 barrier to keep... 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 reticulum.... 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 CFCs or... 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 of air pollution. Air pollution... 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 a rat, it is not true that bigger organisms... 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 of oxygen. It causes... View Article

Becoming exposed to or infected with an infectious microbe does not necessarily mean developing a noticeable disease. Explain.

Our immune system fight for the pathogenic microbes in our body. Our body have cells that are fighting off microbes. Our body have cells that are... View Article

Amoeba acquires its food through a process, termed (a) exocytosis (b) endocytosis (c) plasmolysis (d) exocytosis and endocytosis both

b) Endocytosis Endocytosis is the process of internalisation of substances into the cell. The substance gets surrounded by the cell membrane and... View Article

The substance expected to have the highest ignition temperature out of the following is (a) kerosene (b) petrol (c) coal (d) alcohol

a) Coal Ignition temperature is the temperature at which a substance starts burning. Coal requires a very high initial temperature to start... View Article

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