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Which one of the following species of honey bee is an Italian species? (a) Apis dorsata (b) Apis florae (c) Apis cerana indica (d) Apis mellifera

a) Apis mellifera Explanation Apiculture is the scientific method of rearing honeybees. Apis mellifera is also referred to as the... View Article

A motor car, with its glass totally closed, is parked directly under the sun. The inside temperature of the car rises very high. Explain why?

Sunlight emits ultraviolet radiations which pass through the glass and heat the car. The radiations emitted by inner parts of... View Article

Which of the following helps in repair of tissue and fills up the space inside the organ? (a) Tendon (b) Adipose tissue (c) Areolar (d) Cartilage

(c) Areolar Areolar tissue is the most widely distributed connective tissue in the animal body. It is present under the skin... View Article

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... 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... 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... 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... 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) Explanation Jersey breed is known for its high milk fat percentage and brown Swiss has the... 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,... 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... 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... 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.... 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... 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... 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... 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... 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.

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