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Photosynthesis Experiments

Pond weed was...

Question

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?

A

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

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B

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

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C

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

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D

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

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Solution

The correct option is D
(i) Tube - 2
(ii) Tube - 5
(iii) Tube - 1
(iv) Tube - 1
(v) Tube - 2

(i) Tube - 2; because the snail provides carbon dioxide through its respiration and thus, more photosynthetic activity takes place.
(ii) Tube - 5; because the plant is in dark. So there willl be no photosynthesis.
(iii) Tube - 1; because it is in full light and no animal is present to utilize the oxygen released by the plant
(iv) Tube - 1; because no snail to release carbon dioxide and the plant is utilizing the existing gas.
(v) Tube - 2, It is because the snail can provide carbon dioxide for photosynthesis and it has got all requirements for its survival.

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Similar questions

Q. The diagram alongside is set up to demonstrate an experiment. Pondweed was placed in five water-filled tubes. The experiment was set up as shown in the diagram. The tubes were then left for 24 hours. Write the correct answer out of the five available choices:
Figure

(i) In which tube would you expect to find the plant with the least amount of starch?
(a) 1
(b) 2
(c) 3
(d) 4
(e) 5

(ii) The tube in which most oxygen would be found is
(a) 1
(b) 2
(c) 3
(d) 4
(e) 5

(iii) The tube in which least carbon dioxide would be found is
(a) 1
(b) 2
(c) 3
(d) 4
(e) 5

(iv) The tube in which the plant would survive for the shortest length of time is
(a) 1
(b) 2
(c) 3
(d) 4
(e) 5

Q. An experiment was set up as shown in the adjoining figure. The twig in the diagram was intact on the plant and it was left as such in sunlight for a few hours.
(i) What is the aim of the above experiment?
(ii) Why was potassium hydroxide placed inside the conical flask?
(iii) What test would you perform on the leaf inside the flask?
(iv) What is the expected result of the above test?
(v) Is it necessary to similarly test on outer leaf also? Give a reason.
Figure

Q. The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The experimental set up 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 set up ?

Q. 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 the photosynthesis.
(v) Draw a neat diagram of a chloroplast and label its parts.

Q. How does carbon dioxide return to the atmosphere? Explain.
A student in order to study the importance of certain factors of photosynthesis took a potted plant and dept it in the dark for over 24 hours. Then in the early hours of the morning the student covered one of the leaves with black paper in the centre only. Student placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch.
(i) What aspect of photosynthesis was being investigated?
(ii) Is there any control in this experiment? If so, state the name.
(iii) Why was the plant kept in the dark before the experiment?
(iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch.

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