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During summer, water kept in an earthen pot becomes cool because of the phenomenon of (a) diffusion (b) transpiration (c) osmosis (d) evaporation

(d) Evaporation During summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation. An earthen pot has numerous... View Article

Despite being very useful it is advised to restrict the use of plastic. Why is it so? Can you suggest some methods to limit its consumption?

Plastic is a non-biodegradable material and as such it causes land pollution. At the same time burning such materials in the form of garbage... View Article

Which is the Highest Mountain in the World?

Mount Everest, located on the border between China and Nepal, has an altitude of 8,848.86 meters (29,031.69 feet) - making it the highest... View Article

How is blockchain used today?

Almost all the industries are getting revolutionised by Blockchain technology. It is used in the Banking industry, it can be used in... View Article

Which of the following are exotic breeds? (i) Brawn (ii) Jersey (iii) Brown Swiss (iv) Jersey Swiss (a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv

b) (ii) and (iii) Jersey breed is known for its high milk fat percentage and brown Swiss has the best fat to protein... View Article

A few of Paheli’s classmates eat potato chips and burgers regularly during the recess at school. Are they healthy eating habits? Give reasons.

This is not acceptable and causes several diseases also. Fast food like pizzas, chaat, vada pav, bhajiyas, samosas, burgers, frankies, french... View Article

Naphthalene balls are obtained from coal tar and are used as: (a) mosquito repellant (b) honey bee repellant (c) moth repellant (d) snake repellant

c) Moth repellant Naphthalene is flammable and potentially explosive. Hence, Naphthalene balls are obtained from coal tar. The labelled use of... View Article

Cells consist of many organelles, yet we do not call any of these organelles as a structural and functional unit of living organisms. Explain.

Although cell organelles have specific structures and perform specific functions but they cannot be called structural and functional units of... View Article

Water is the best extinguisher for fires involving electrical equipment. (True or False). Also write the false statements in their correct form.

False – Carbon dioxide is the best extinguisher for fires involving electrical equipment. If electrical equipment is on fire, water may... View Article

Metals are generally solid. Which of the following metals is in the liquid state at room temperature? (a) Mercury (b) Silver (c) Aluminium (d) Sodium

Mercury Generally, all the metals are found in the solid state at room temperature. The exception to this is mercury. Mercury is found in liquid... View Article

A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such situation? Explain.

Concentration salt solution is a hypertonic solution (water concentration lower as compared to the cell) therefore it causes exosmosis. The... View Article

The cell organelle involved in forming complex sugars from simple sugars are (a) endoplasmic reticulum (b) ribosomes (c) plastids (d) golgi apparatus

d) Golgi apparatus The Golgi apparatus has multiple names such as Golgi complex or Golgi body. The name is given on the name of the scientist,... View Article

It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why?

Priyanshi would be more comfortable. The reason is that we get a lot of sweat on our body in a hot summer day. Cotton being a good absorber of... View Article

Exhaustible natural resources are: (a) unlimited in quantity. (b) not dependent on nature. (c) limited in quantity. (d) not exhausted by human activities.

(c) limited in quantity. Exhaustible natural resources are limited in quantity, as their rate of consumption is more than the rate of... View Article

Fresh milk is boiled before consumption while processed milk stored in packets can be consumed without boiling. Give reasons for the following.

Boiling fresh milk is necessary to kill the harmful microorganism present in it. Whereas, processed milk is safe to drink directly because it is... View Article

Which of the following procedures will give you water free from all impurities? (a) adding chlorine tablets (b) distillation (c) boiling (d) filtration

(b) distillation Distillation procedures will give us water free from all impurities . The distillation process removes almost all impurities... View Article

Potable water is the water which is (a) obtained from a river. (b) obtained from a lake. (c) pure and fit for drinking. (d) used only for washing clothes.

(c) pure and fit for drinking. Potable water is a water which is fit for consumption by humans and other animals. It is also called as drinking... View Article

Structures present in a cell which is responsible for determination of the sex of a baby is (a) cytoplasm (b) cell membrane (c) nucleus (d) chromosome

(d) Chromosome Sex chromosomes are different for males and females. Human cells are having two types of chromosomes: autosomes and sex... View Article

Classify the following into friendly and harmful microorganisms. Yeast, malarial parasite, Lactobacillus, bread mould, Rhizobium, Bacillus anthracis

Friendly microbes are yeasts, Lactobacillus, Rhizobium. Yeasts are used commercially for making bread and alcoholic beverages. Rhizobium is a... View Article

Preventive and control measures adopted for the storage of grains include (a) strict cleaning (b) proper disjoining (c) fumigation (d) all of the above

All of the above Godown, warehouses and stores should be properly cleaned, dried and repaired. Pathways (alleys) should be provided between... View Article

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