Photosynthesis Experiments

Q.

Write an experiment to show that chlorophyll is necessary for photosynthesis.

Q.

Give a brief description of the process of synthesis of food in green plants. [3 MARKS]

Q.

To test a leaf for starch, the leaf is boiled in water to (i) ____________.

It is then boiled in Methylated spirit to (ii) ___________.

The leaf is dipped in warm water to soften it. It is places in a petri dish, and (iii) __________ solution is added.

The region of the leaf which contains starch, turns (iv) _________ and the region which does not contain starch turns (v) ___________.

Q.

Explain with activities where plants need H₂O and CO₂.

Q.

The steps in a starch test have been listed below.

1) Place the leaf in methylated spirit and heat it over a water bath

2) Pour iodine over it

3) Place the leaf in water

4) Place the leaf in boiling water

Which of the following correctly lists the order in which the steps are to be carried out.

1. 4, 1, 3, 2

2. 2, 3, 1, 4

3. 3, 1, 2, 4

4. 4, 1, 2, 3

Q.

Question 4
Give a brief description of the process of synthesis of food in green plants.

Q. What is meant by destarched ? why do plants get destarched when kept in dark room for 3 days

Q.

How are carbohydrates stored in plants and animals?

Q.

Pond weed was placed in five water-filled tubes and the experimental set up was allowed to remain as shown in the diagram alongside for 24 hours. In which tube would you expect to find:
(i) the greatest increase in the dry weight of the pond weed?
(ii) the plant with the least amount of starch?
(iii) the most oxygen?
(iv) the least carbon dioxide?
(v) the plant to survive for the longest length of time?

1. (i) Tube - 1
   (ii) Tube - 5
   (iii) Tube - 2
   (iv) Tube - 1
   (v) Tube - 4

2. (i) Tube - 2
   (ii) Tube - 2
   (iii) Tube - 3
   (iv) Tube - 4
   (v) Tube - 5

3. (i) Tube - 4
   (ii) Tube - 1
   (iii) Tube - 1
   (iv) Tube - 5
   (v) Tube - 2

4. (i) Tube - 2
   (ii) Tube - 5
   (iii) Tube - 1
   (iv) Tube - 1
   (v) Tube - 2

Q.

Iodine solution is prepared using 0.3g of Iodine and __________________ in 100ml of water.

1. 1.5g of Potassium Permagnate

2. 2.5g of Potassium Nitrate

3. 0.5g of Sodium Iodide

4. 1.5g of Potassium Iodide

Q.

Why are the minerals essential in photosynthesis ?2 or 3 marks

Q.

How do we destarch a plant?

Q.

The experimental set up show below is to show that ___ is necessary for photosynthesis.

1. oxygen

2. hydrogen

3. water

4. carbon dioxide

Q. The process of starch removal in plants by keeping it in the dark for a day or two is known as ___.

Q.

On testing with iodine, starch turns ______ in colour.

Q.

The specific function of light energy in the process of photosynthesis is to___________.

1. split water molecule

2. reduce carbon dioxide

3. activate chlorophyll

4. synthesize glucose

Q.

A Hydrilla plant is kept in a beaker containing water. It is covered with an inverted glass funnel and a test tube full of water is placed over it. Care is taken about the water level so that no bubble enters the test tube. The whole experiment is put in sunlight. It is found that the level of water is coming down and gas accumulates at the upper end of the test tube. The whole experiment is conducted in red, blue and green light alternatively. After some time some amount of Sodium bicarbonate is added to the beaker.

What will happen to the rate of photosynthesis if the plant Hydrilla is replaced by the grass?

1. Rate will increase

2. Rate will decrease

3. Photosynthesis will stop

4. None of the given statement is correct

Q.

Give account of the reaction of the photosynthesis reaction? for 2 marks

Q.

Why is the rate of photosynthesis minimum in green light and maximum in blue light??

Q.

Iodine is used to test the presence of starch.

1. False

2. True

Q.

Name the solution in which the leaf must be boiled to remove the chlorophyll.

Q.

To make the plant free of starch, it is:

1. Kept in a room, but with lights on at night only

2. Kept under the shade of tree

3. Kept covered with coloured polythene in a shady place

4. Kept in darkness for 72 hours

Q.

Which of the following would be indicators that can be used to observe transpiration occurring in a leaf?

1. pH paper

2. Litmus paper

3. Dry cobalt chloride paper

4. Bathophenanthroline Indicator Paper

Q.

The main ingredient of the starch test is __.

Q. Which of the following characteristics holds true for the process of photosynthesis? ​

1. Takes place in the presence of light
2. Glucose and oxygen are the end products​
3. A catabolic process​
4. Mitochondria is the required cell organelle​

Q.

Why do we boil the leaf in alchohol when we are testing it for starch

Q.

Write a note on essential nutrients required by plants.

Q.

The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because

(a) starch is the immediate product of photosynthesis.

(b) glucose formed in photosynthesis soon gets converted into starch.

(c) starch is soluble in water.

(d) sugar cannot be tested.

Q.

In case of albuminuria which combination of tests you will perform on a given sample of urine.

1. Benedict's test and fehling's test

2. Sodium hypobromite test and urease test

3. Sulphosalicylic acid test and Heller's test

4. Smith's test and Pettenkofer's test

Q.

If iodine is not available what will we use to confirm the presence of starch?