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During respiration exchange of gases take place in (a) trachea and larynx (b) alveoli of lungs (c) alveoli and throat (d) throat and larynx

(b) Alveoli of lungs Explanation During inhalation, oxygen has a higher concentration in the alveoli as compared to the blood... View Article

Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

The biotic and abiotic factors responsible for soil formation are as follows Abiotic factors in the making of soil –... View Article

Incomplete combustion of fuel such as petrol and diesel gives (a) nitrogen oxide (b) sulphur dioxide (c) carbon monoxide (d) carbon dioxide

(c) carbon monoxide During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water... View Article

Unscramble the jumbled words given below, related to synthetic materials. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton

(a) Rayon (b) Polymer (c) Terylene (d) plastic (e) Polyester (f) Teflon Rayon is a fabric made of semi-synthetic fibre.... View Article

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... 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 Explanation The Southwest Monsoon Season or the Rainy Season starts from the month of June and continues... 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 Explanation Phototropism is the growth of a plant in the direction of light. It is one of the... 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) Explanation Amphibians do not have scales and their skin is permeable so allow the diffusion of... 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... 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... 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... 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... 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 Explanation The two forms of oxygen found in the atmosphere are a diatomic molecular form that... 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 Explanation Binomial nomenclature is the biological system of naming the organisms in which the name is composed... 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... 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.... 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... 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 Explanation Tobacco smoking can lead to lung cancer, chronic bronchitis, and emphysema. It increases the risk of heart... 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 Explanation The phytohormones, like auxins and gibberellins (GA), have positive growth-promoting effects whereas abscisic acid (ABA) and... View Article

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