Science Practice Quiz 47

Q1.Why are molecular movements needed for life?

A. To generate heat for the organism. B. To break down the organism's structures. C. To repair and maintain the organised structures of living creatures. D. To allow organisms to move from one place to another.

Q2.What are 'Life Processes'?

A. The visible movements of organisms. B. The growth-related changes in organisms. C. The maintenance functions of living organisms that must go on even when they are not doing anything particular. D. The process of infection by viruses.

Q3.Which of the following is NOT an event that occurs during the process of photosynthesis?

A. Absorption of light energy by chlorophyll. B. Conversion of light energy to chemical energy. C. Splitting of water molecules into hydrogen and oxygen. D. Oxidation of carbon dioxide to carbohydrates.

Q4.Chlorophyll, essential for photosynthesis, is contained within which cell organelles?

A. Mitochondria B. Chloroplasts C. Ribosomes D. Vacuoles

Q5.How do desert plants primarily adapt their carbon dioxide uptake for photosynthesis?

A. They absorb carbon dioxide only during the day. B. They take up carbon dioxide at night. C. They do not require carbon dioxide for photosynthesis. D. They store carbon dioxide in their roots.

Q6.In the activity demonstrating chlorophyll's essential role in photosynthesis, why is the potted plant kept in a dark room for three days initially?

A. To promote rapid growth of new leaves. B. To ensure all the starch in the leaves gets used up. C. To make the leaves more sensitive to light. D. To prevent water loss from the plant.

Q7.What is the primary purpose of immersing the leaf in alcohol and heating it in a water-bath during the experiment on photosynthesis?

A. To test for the presence of water. B. To remove the chlorophyll from the leaf. C. To soften the leaf tissue. D. To kill any microorganisms on the leaf surface.

Q8.After decolorizing the leaf, why is it dipped in a dilute solution of iodine in the experiment?

A. To rehydrate the leaf cells. B. To test for the presence of starch. C. To observe the structure of chloroplasts. D. To measure the rate of oxygen release.

Q9.Regarding the events of photosynthesis, which of the following statements is true?

A. All steps must occur immediately one after the other. B. The steps can occur independently of each other. C. The steps need not take place one after the other immediately. D. Only the first step is dependent on light energy.

Q10.What is the initial event in the process of photosynthesis?

A. Reduction of carbon dioxide to carbohydrates. B. Splitting of water molecules into hydrogen and oxygen. C. Absorption of light energy by chlorophyll. D. Conversion of chemical energy to light energy.

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Science Practice Quiz 47