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Pathogenic micro-organisms present in host cells are killed by medicines called (a) Pain killer (b) Antibodies (c) Antibiotics (d) Vaccines

Antibiotics are substances that may inhibit or kill the growth of different microbes. Microorganisms causing infection in host bodies are killed... View Article

The monsoon season in our country is during the months (a) April to December (b) June to September (c) November to March (d) January to May

June to September The Southwest Monsoon Season or the Rainy Season starts from the month of June and continues till September. This season is... View Article

The movement of sunflower in accordance with the path of the sun is due to (a) phototropism (b) geotropism (c) chemotropism (d) hydrotropism

a) Phototropism Phototropism is the growth of a plant in the direction of light. It is one of the many plant tropisms or movements which... View Article

Which among the following have scales? (i) Amphibians (ii) Pisces (iii) Reptiles (iv) Mammals (a) (i) and (iii) (b) (iii) and (iv) (c) (ii) and (iii) (d) (i) and (ii)

C) (ii) and (iii) Amphibians do not have scales and their skin is permeable so allow the diffusion of gasses. Reptiles are covered with scales... View Article

At room temperature the forces of attraction between the particles of solid substances are___than those which exist in the gaseous state.

At room temperature the forces of attraction between the particles of solid substances are stronger than those which exist in the gaseous state.... View Article

Our government has legalised the age for marriage in boys and girls. Give reasons as to why one should get married after a certain age.

After a certain age, An individual becomes sexually and mentally mature. After that age an individual becomes adults. According to the Indian... View Article

AIDS can spread from an infected person to another person through: (a) sharing food (b) blood transfusion (c) sharing comb (d) a mosquito bite

(b) blood transfusion AIDS is a disease that can develop in people with HIV. It’s the most advanced stage of HIV. But just because a... View Article

The substance that will be flattened on beating with a hammer is (a) Crystal of iodine (b) Lump of sulphur (c) Piece of coal (d) Zinc granule

(d) Zinc granules Metals can be beaten into thin sheets (or flattened) with a hammer. Non-metals break into small pieces when hammered. So, zinc... View Article

The two forms of oxygen found in the atmosphere are (a) water and ozone (b) water and oxygen (c) ozone and oxygen (d) water and carbon-dioxide

c) Ozone and oxygen The two forms of oxygen found in the atmosphere are a diatomic molecular form that has chemical formula as O2 or oxygen,... View Article

Who introduced the system of scientific nomenclature of organisms (a) Robert Whittaker (b) Carolus Linnaeus (c) Robert Hooke (d) Ernst Haeckel

(b) Carolus Linnaeus Binomial nomenclature is the biological system of naming the organisms in which the name is composed of two terms, where,... View Article

The quality of air at various locations is monitored regularly by the government and other agencies? In what way can you use these data?

The quality of air at various locations is monitored regularly by government and other agencies. These data can be used to generate awareness... View Article

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife? (a) Iron (b) Sodium (c) Gold (d) Magnesium

(b) sodium All metals are hard except sodium and potassium, which are soft and can be cut with a knife. Sodium, potassium, lithium are soft... View Article

Which of the following is not a common property of plastics? (a) Non-reactive (b) Light in weight (c) Durable (d) Good conductor of electricity

Answer: Good conductor of electricity Plastic is a synthetic material created from a broad range of organic polymers that have become an... View Article

Which one of the following has a long term effect on the health of an individual? (a) Common cold (b) Chicken pox (c) Chewing tobacco (d) Stress

c) Chewing tobacco Tobacco smoking can lead to lung cancer, chronic bronchitis, and emphysema. It increases the risk of heart disease,... View Article

For the metamorphosis of tadpoles which of the following elements must be available in the water? (a) chlorine (b) carbon (c) sulphur (d) iodine

d) Iodine For the metamorphosis of tadpoles, thyroid hormone along with the essential constituent iodine is necessary. Metamorphosis is a... View Article

The substance that triggers the fall of mature leaves and fruits from plants is due to (a) auxin (b) gibberellin (c) abscisic acid (d) cytokinin

C. Abscisic acid The phytohormones, like auxins and gibberellins (GA), have positive growth-promoting effects whereas abscisic acid (ABA) and... View Article

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 Apiculture is the scientific method of rearing honeybees. Apis mellifera is also referred to as the Italian bee. This species... 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 the cannot pass out... 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 and supports... 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 pot has numerous... View Article

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