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

Using the destarched plant describe step by step how would you proceed to prove that in the absence of light the leaf cannot manufacture starch?

A healthy croton plant bearing variegated leaves was kept in a dark cupboard to destarch it after which it was placed in sunlight for a few hours. One of the leaves was then plucked and an outline of the leaf marking the green and the non-green regions was drawn. The leaf was then tested for starch. Using the above information, answer the following questions:

1. State the aim of the above experiment.
2. Name the chemical used for testing the presence of starch.
3. Why is the leaf boiled in water and alcohol before testing for the presence of starch?
4. What change is seen on the leaf after the starch test?
5. Give the chemical equation to represent the process of starch formation in plants.

A candidate in order to study the importance of certain factors in photosynthesis took a potted plant and kept it in the dark for over 24 hours. Then in the early hours of the morning, she covered one of the leaves with black paper in the center only. She placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch.

1. What aspect of photosynthesis was being investigated?
2. Is there any control in this experiment? If so, state the same.
3. Why was the plant kept in the dark before the experiment?
4. Describe step by step how the candidate proceeded to test the leaf for the presence of starch.

Name the following:

In-plant cells, carbohydrates are stored in which form.

Name the following:

The chemical substance used to test the presence of starch in the cell of a leaf.

Give the Technical Term: Name the gland in the body that secretes the so-called ‘Emergency hormone’.

Give the Technical Term: When your mouth dries up and the heart begins to beat faster, which hormone brings about the feeling?

Give the Technical Term: Name the hormone which prepares the body to face an emergency situation.

Give the Technical Term: Name the glands which secrete the following hormone: Adrenaline

Give the Technical Term: Name the glands which secrete the following hormone: Noradrenalin

Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:

Adrenal medulla produces adrenaline.

Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:

Adrenal cortex produces emergency hormone adrenaline.

State the Location

Adrenal

Distinguish between Diffusion and Osmosis.

Write a note on the four different kinds of cell in Pancreas.

Define Photosynthesis.

Mention three functions of Adrenaline.

Name the following:

A gaseous plant hormone which promotes the ripening of fruits.

List the hormones secreted by the following:

Adrenal

Expand the abbreviation - NADP.