Test for Carbon Dioxide

Q.

Name the two stages in photosynthesis.

Q.

Is PEP carboxylase found in C3 plants?

Q.

Describe an activity to show that carbon dioxide is released during respiration

Q. Which of the following events occur in the chloroplast during the process of photosynthesis?

1. Conversion of light energy to chemical energy
2. Splitting of water molecule
3. Reduction of oxygen to carbohydrates
4. Reduction of carbon dioxide to carbohydrates

Q.

Name the site of light and dark reaction of photosynthesis?

Q.

Two healthy green plants were placed in the dark for 24 hours. They were then set up as shown in the figure and were left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves.

What hypothesis is being tested in this experiment?

1. The hypothesis is that the leaf from plant A do not show starch test while the leaf from plant B turns blue-black showing the presence of starch.

2. The hypothesis is that plant B would serve as a control.

3. None of the above

4. The hypothesis is that C$O_2$ is necessary for photosynthesis is being tested in this experiment.

Q. In the experiment to show that $C{O}_2$ is released during respiration', the small test tube of KOH solution is suspended inside the conical flask to absorb the :
(a) air of the flask
(b) moisture of the flask
(c) $O_2$ of the flask
(d) $C{O}_2$ of the flask released by the seeds

Q.

The diagram given below represents an experiment performed to demonstrate a particular aspect of photosynthesis. The apparatus was kept in sunlight for the whole day. The numeral 1 represents a certain condition inside the flask and numeral 2 represents a chemical responsible for this condition.


Which of the following are True?
(a) The chemical substance numbered 2 is Potassium Hydroxide (KOH)
(b) The process which is reverse of photosynthesis in terms of the end-products is respiration.
(c) The special condition inside the flask is that the substance placed inside absorbs all the C$O_2$ and the leaf gets no C$O_2$.

1. Only (b) and (c) are True.

2. (a), (b) and (c) are True.

3. Only (a) and (b) are True.

4. Only (b) is True.

Q.

Question 59
Mention the major events during photosynthesis.

Q.

Is pineapple a CAM plant?

Q.

Question 40
If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

Q.

1. chlorophyll
2. $C{O}_2$
3. light
4. $H_{2}O$

Q.

The figure given alongside represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet A represents a certain condition inside the flask. Observe the diagram and then answer the following questions.

1. What is the aim of the experiment?
2. What happens to the leaf when tested with iodine?
3. Which chemical can be used as an alternative to KOH?
4. What happened to leaf A and leaf C at the end of the starch test?

Q.

Chemicals such as fertilisers, insects, pesticides and weedicides decrease agricultural production.

1. True
2. False

Q. In the experiment to show that '$C{O}_2$ is released during respiration', the solution into which we blow $C{O}_2$ is chemically :

(a) $Ca(OH{)}_2$

(b) $KOH$

(c) $NaCl$

(d) $KCI$

Q.

Given below is the diagram of an experimental set-up.

What is the error present in this diagram?

1. (c) Sunlight should be directly above.

2. (b) Placement of flask.

3. (d) No error.

4. (a) Lime water.

Q. A student sets up the apparatus for the experiment to show that $C{O}_2$ is released during
respiration. After two hours he would observe :

1. KOH turning milky
2. water level rising in the bent tube in the beaker.
3. water level decreasing in the bent tube
4. no change in water level in the bent tube.

Q. The aim behind Moll's half-leaf experiment was

1. CO${}_2$ is produced during anaerobic respiration
2. CO${}_2$ is necessary for photosynthesis
3. CO${}_2$ is produced during aerobic respiration
4. Chlorophyll is necessary for photosynthesis

Q. The herbicide DCMU kills weeds because it inhibits

1. $C{O}_2$ fixation
2. cell division
3. respiration
4. $N{O}_3$ uptake

Q. The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet '$A$' represents a certain condition inside the flask.
(i) What is the aim of the experiment?
(ii) Identify the special condition inside the flask.
(iii) Name an alternative chemical that can be used instead of $KOH$.
(iv) In what manner do the leaves $1$ and $2$ differ at the end of the starch test?

Q. If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

Q. The chemical used to absorb carbon dioxide during a test to check for the significance of carbon dioxide in photosynthesis is

1. iodine
2. potassium hydroxide
3. potassium iodide
4. sodium chloride

Q.

1. light absorption
2. water splitting and $O_2$ release
3. ATP and NADPH formation
4. $C{O}_2$ fixation

Q. During day time, CAM(Crassulacean acid metabolizing): Plants procure $C{O}_2$ for photosynthesis from _____________.

1. Pyruvic acid
2. Oxaloacetic acid
3. Oxalic acid
4. Malic acid

Q.

121. The amount of ethyl alcohol in the blood of a person can be analyzed by using a breath analyzer which contains acidified ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$. Explain the principle involved.

Q. Potassium Hydroxide is used in this experiment because

1. It is a chemical that absorbs Carbon Dioxide
2. It is a chemical that releases Carbon Dioxide
3. Both B & C
4. It is a chemical that absorbs Oxygen

Q. Moll's experiment shows

1. Unequal transpiration from two surfaces of leaf
2. $C{O}_2$ is essential for photosynthesis
3. Relation between transpiration and absorption
4. Chlorophyll is essential for photosynthesis

Q. In the experimental setup shown in the given figure, water is found to rise in the bent tube. The reason is that ________.

1. Seeds use up oxygen in the flask
2. Germinating seeds attract water from the beaker
3. Carbon dioxide is given out by germinating seeds
4. Seeds use oxygen and release $C{O}_2$ which is absorbed by potassium hydroxide due to which a partial vacumn is created in the flask

Q. Path of carbon in photosynthesis was found by using

1. Radio isotopes
2. Chromatography
3. Fractionation
4. Centrifugation

Q. What happens if the process of photosynthesis in plants for the formation of carbohydrate ?

1. Reduction of $O_2$
2. Reduction of $N_2$
3. Reduction of $C{O}_2$
4. Oxidation of $H_{@}$