Gaseous Exchange in Plants

Q. Which of the following is the correct equation for photosynthesis?

1. $6C{O}_2+H_{2}O\stackrel{sunlight}{\to }{C}_6{H}_{12}{O}_6+O_2+6H_{2}O$
2. $6C{O}_2+12H_{2}O\underset{Chlorophyll}{\overset{sunlight}{\to }}{C}_6{H}_{12}{O}_6+6O_2+6H_{2}O$
3. $6C{O}_2+12H_{2}O\stackrel{sunlight}{\to }{C}_6{H}_{12}{O}_6+6C{O}_2+6H_{2}O$
4. $6C{O}_2+H_{2}O\to C_6{H}_{12}{O}_6+O_2+6H_{2}O$

Q. Plants absorb water using fine structures on roots called .

1. root hair
2. root teeth
3. root fibres
4. root trachea

Q. Observe the given diagram and answer the following questions:

What is the aim of the experiment?

[1 Mark]

1. To show that oxygen is necessary for photosynthesis
2. To show that nitrogen is necessary for photosynthesis
3. To show that carbon dioxide is necessary for photosynthesis
4. None of the above

Q. Human beings take in and release .

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

Q.

Name the two parts of a plant through which its gaseous waste products are released into the air.

Q. The diagram alongside 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 test tubes are kept in sunlight. Answer the questions that follows.

(iii) What is the purpose of keeping a snail in test tube $B$?

Q. The main ingredients of photosynthesis are:

1. Chlorophyll, ${\text{CO}}_2$, ${\text{O}}_2$, ${\text{H}}_2\text{O}$
2. Chlorophyll, light, ${\text{CO}}_2$, ${\text{H}}_2\text{O}$
3. n(${\text{CH}}_2\text{O}$), light and ${\text{CO}}_2$
4. Chlorophyll, ${\text{O}}_2$, Light, ${\text{H}}_2\text{O}$

Q. Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the questions that follow:

(a) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
(b) Why are glass slides placed over the dry cobalt chloride papers?
(c) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.

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Q.

Given below is a microscopic view of a leaf surface. Identify the pores.

Q. Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the questions that follow:

(a) Is the experimental leaf a monocot or a dicot? Give a reason to support your answer.
(b) Why are glass slides placed over the dry cobalt chloride papers?
(c) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [Review Questions - Pg No.66 - Skill Type - 3]

Q. Transpiration occurs from the roots of a plant.

1. True
2. False

Q. Respiration and photosynthesis are just the

1. Similar process
2. Burning process
3. None of these
4. Opposite process

Q. Below is list of different plant parts:

Plant Parts: Stem, flowers, leaves, roots and buds.

From the above list of plant parts, which specific part can be considered as heterotrophic as well as a storage organ.

Q. Which of the following structures helps in the absorption of water from the soil?

1. Root hair
2. Root tip
3. Stomata
4. Root cap

Q. The figure alongside represents the vertical section of a leaf.
(i) Name the parts labelled 1 to 5
(ii) What do the two arrows (dotted and solid) indicate in the daytime and at night
(iii) Could you add one more arrow in the figure? If yes, what for?
(iv) How many leaf veins have been shown in this section?
Figure