Test for Oxygen

Q.

Two green plants are kept separately in oxygen-free containers, one in the dark and the other in continuous light. The one in dark will live longer.

1. True
2. False

Q.

Does photosynthesis produce water?

Q.

In the bell jar experiment, how does KOH affect the process of photosynthesis?

1. Increases water intake and O₂ production.

2. Inhibits CO₂ intake by plant.

3. Stops the glucose/ starch production in leaves.

4. Both B and C.

Q.

The gas collected in the test tube in the experiment shown below is___.

1. carbon dioxide

2. nitrogen

3. combination of nitrogen and hydrogen

4. oxygen

Q.

Oxygen during photosynthesis is evolved in which process?

Q. A student covered a leaf of a de-starched plant with a black paper strip and kept it in the garden outside his house in fresh air. In the evening, he tested the covered portion of the leaf for the presence of starch. By doing so the student was trying to show that :
(a) $C{O}_2$ is given out during respiration
(b) $C{O}_2$ is necessary for photosynthesis
(c) Chlorophyll is necessary for photosynthesis
(d) Light is necessary for photosynthesis

Q. Hydrilla in an inverted funnel: Test tube with water inverted onto funnel. A splinter exposed to this tube bursts into flame due to the presence of.

1. hydrogen
2. oxygen
3. nitrogen
4. carbon dioxide

Q.

How do plants obtain minerals? For 2 or 3 marks

Q.

To show that oxygen is produced during photosynthesis, water plants like Elodea or Hydrilla is used.

True or False?

1. True

2. False

Q. Which chemical absorbs $C{O}_2$ released during the experiment $‘C{O}_2$ is essential for photosynthesis’?​

1. NaOH
2. $CaC{l}_2$
3. KOH
4. KCI

Q.

A glowing splinter is used to confirm that oxygen is produced during photosynthesis. True or false?

1. True

2. False

Q.

In this experiment, how does KOH affect the process of photosynthesis in the plant kept in bell jar ?

1. Increases water intake and O₂ production.

2. Inhibits CO₂ intake by plant.

3. Stops the glucose/ starch production in leaves.

4. Both B and C.

Q.

In the fallowing experiment for photosynthesis, a leaf is inserted into a conical flask containing potassium hydroxide. What is the aim of the experiment?

​​

1. To prove that oxygen is given out during photosynthesis

2. To prove that carbon dioxide is given out during photosynthesis

3. To prove that oxygen is produced during photosynthesis

4. To prove that carbon dioxide is needed for photosynthesis

Q.

In the following experiment for photosynthesis, a leaf is inserted into a conical flask containing potassium hydroxide. What is the aim of the experiment?

​​

1. To prove that oxygen is produced during photosynthesis

2. To prove that carbon dioxide is needed for photosynthesis

3. To prove that oxygen is given out during photosynthesis

4. To prove that carbon dioxide is given out during photosynthesis

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.

Q. Oxygen evolution takes place during photosynthesis in green plants but not in bacterial photosynthesis, because _________________.

1. Bacteria are prokaryotic and green plants are eukaryotic
2. Only photosystem I is present in bacterial photosynthesis
3. Bacterial cell wall composition is different from green plant cell wall
4. Rate of $O_2$ consumption in bacteria is higher than that in green plants

Q. The process in which liquid water changes into gas is called

1. Precipitation
2. Condensation
3. Evaporation
4. Transpiration

Q. In 1772, Joseph Priestley demonstrated that

1. Plants foul the air
2. Animals purify the air during day time
3. Plants and animals restore air for each other
4. Plants get killed in the air produced by animals

Q. In an experiment demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental setup. What would happen if all other conditions are favourable?

1. Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate.
2. Amount of oxygen evolved increases as the availability of carbon dioxide increases.
3. Amount of oxygen evolved decreases as the availability of carbon dioxide increases.
4. Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate.

Q. What aspect of the physiological process is being examined?

Q. Hydrilla leaf is used in an experiment to test that _______________.

1. Chlorophyll is necessary for photosynthesis
2. Light is necessary for photosynthesis
3. CO${}_2$ is necessary for photosynthesis
4. Oxygen is evolved during photosynthesis

Q.

1. Ingenhousz
2. Priestley
3. Sachs
4. Engelmann

Q. In an experiment, demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental setup. What would happen if all other conditions are favorable?

1. Amount of oxygen evolved decreases as carbon dioxide in water is absorbed by sodium bicarbonate
2. Amount of oxygen evolved increases as the availability of carbon dioxide increases
3. Amount of oxygen evolved decreases as the availability of carbon dioxide increases
4. Amount of oxygen evolved increases as carbon dioxide in water is absorbed by sodium bicarbonate

Q. An experiment was set up as shown in the figure alongside. Look at the figure and answer the following questions:
(i) What is the objective of this experiment?
(ii) Which plant is used in this experiment?
(iii) Which gas is evolved in this process?
(iv) What will happen to the rate of evolution of this gas if a pinch of sodium bicarbonate is added?
(v) What will happen if the apparatus is kept in dark?
Figure

Q. Which is the evidence to show that $O_2$ released during photosynthesis comes from water?

1. Synthesis of carbohydrates and formation of $H_{2}O$ and sulphur by photosynthetic bacteria when supplied with $H_{2}S$ and $C{O}_2$
2. Release of radioactive $O_2$ when water is supplied as $H_2{O}^{18}$
3. Release of $O_2$ by isolated chloroplasts when potassium ferrocyanide or some other reducing substance is supplied
4. All the above

Q. The splinter bursting into a flame indicates that the tube contains:

1. Carbon Dioxide
2. Both B & C
3. Oxygen
4. Hydrogen

Q. What is the role of KOH in experiment?​

Q. Oxygen is a waste product released by the plant into the atmosphere during photosynthesis.

1. False
2. True

Q.

1. $C{O}_2$
2. $O_2$
3. $H_2$
4. $H_{2}O$

Q. Two plants A and B are supplied with CO${}_2$ with H${}_2$O${}^{18}$ and CO${}_2^{18}$ with H${}_{2}O$ respectively. Which of the following plant releases O${}^{18}$ type oxygen in photosynthesis?

1. A plant
2. None of the above
3. Both A and B
4. B plant