(English Medium) ICSE Class 10 - CISCE Important Questions for Biology

Briefly explain the following terms: Photophosphorylation

the exact location of the Thylakoids

The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. Test-tube B contains both a green water plant and a snail. Both testtubes are kept in sunlight. Answer the questions that follow:

(i) Name the physiological process that releases the bubbles of oxygen.
(ii) Explain the physiological process as mentioned above in Q2 (a)(i).
(iii) What is the purpose of keeping a snail in test-tube ‘B’?
(iv) Why does test-tube ‘B’ have more bubbles of oxygen?
(v) Given an example of a water plant that can be used in the above process.
(vi) Write the overall chemical equation for the above process.

The process of conversion of ADP into ATP during photosynthesis.

State the main function of the Lenticels

Identify the odd one in each set : Transpiration, Photosynthesis, Phagocytosis, Guttation

The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions:

(i) Name the process intended for study.
(ii) Define the above mentioned process.
(iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation in A & B.
(iv) What is the purpose of keeping the test tube B in the experimental setup?

A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.

(i) What aspect of photosynthesis was being tested?
(ii) Why was the plant placed in the dark before beginning the experiment?
(iii) During the starch test, why was the leaf 

      (1) boiled in water

      (2) boiled in methylated spirit

(iv) Write a balanced chemical equation to represent the process of photosynthesis.
(v) Draw a neat diagram of a chloroplast and label its parts.

Give one example of An aquatic plant used in the laboratory to demonstrate O₂ liberation during photosynthesis

Expand the following biological abbreviations: ATP

Complete the following paragraph by filling in the blank (1) to (5) with appropriate words:

To test a leaf for starch, the leaf is boiled in water to (1) _________.  It is then boiled in Methylated spirit to (2) ________. The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (3) _____ solution is added. The region of the leaf which contains starch, turns (4) ________and the region while does not contain starch, turns (5) __________.

A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagrams and answer the questions:

1. What aspect of photosynthesis is being tested in the above diagram?
2. Represent the process of photosynthesis in the form of a balanced equation.
3. Why was the plant kept in the dark before beginning the experiment?
4. What will be the result of the starch test performed on Leaf ‘A’ shown in the diagram? Give an example of a plant with variegated leaves
5. Draw a neat labelled diagram of a chloroplast.

Differentiate between the following pairs on the basis of what is indicated in the brackets.

Leaf and Liver [form in which glucose is stored]

Give biological explanations for Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.

 Give suitable biological reasons for the following statement : 
 All life on Earth is supported by Photosynthesis. 

Expand the following biological abbreviations : 
 ATP 

Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow : 

 Label the parts 1 and 2. 

Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow :

(ii) Name the tropic movement shown by part 1. 

 Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow :
Part 1 is affected by two stimuli. Name them. Which one of the two is stronger? 

 Part 1 is affected by two stimuli. Name them. Which one of the two is stronger? 

Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow : 

What is Thigmotropism? Give one example.