(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Biology

A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

What aspect of photosynthesis was being investigated?

A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

Is there any control in this experiment? If so, state it.

A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

Why was the plant kept in the dark before the experiment?

A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

Describe step by step, how the candidate proceeded to test the leaf for the presence of starch?

Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. 

Explain briefly the role of the following structures in this process is Phloem tissue in the leaf veins.

Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.

Explain briefly the role of the following structures in this process is Stomata.

Explain the following term :

Motor nerve

Explain the following term :

Association neuron

State any four major activities of the Red Cross Society.

Explain the Term: Disinfectants

Explain the Term: Antiseptics

Name the Following: These are chemical substances that inhibit the growth of bacteria and are commonly used on the site of infection.

Name the Following: The protein molecules which shows specificity against invading germs.

Name the Following: The foreign materials which stimulate the production of antibodies.

Name the Following: What is Penicillin?

Name the Following: A substance which when injected into our body protects us against future infection.

Name the Following: Name any three vaccines and the diseases for which they provide immunity.

Name the Following: For which disease Immunization is provided by DPT vaccine.

Name the Following: Vaccination is not available against.

Name the Following: The causative agent of AIDS.