Leaf: Structure and Functions

Q. Explain structure of a leaf in detail.

Q. The part of the leaf that attaches it to the stem is

1. Petiole
2. lamina
3. Leaf blade
4. Midrib

Q. The process by which food is prepared, in the leaves, is known as _______ .

1. respiration
2. pollination
3. photosynthesis
4. transpiration

Q. Transpiration in plants takes place through the .

1. stem
2. leaf
3. flower
4. root

Q.

All leaves in a plant will always be of the same size.

1. True
2. False

Q.

Question 1 (ii)

Correct the following statements and rewrite them in your notebook.
Leaves hold the plant upright.

Q.

How are stomata helpful in the process of transpiration?

Q.

One day, students were asked to perform an activity. They were told to identify the root system in some given plant samples by analysing the venation in leaves. Archana at the same time failed to do so. She got sad and asked her teacher to guide her after the test.

(a) How will you identify the root system by analysing the leaves?
(b) Distinguish two types of venation in leaves.
(c) What are the values shown by Archana?

Q.

A ___ leaf is directly attached to the stem without a leaf stalk.

Q. Differentiate between the following:​
(iii) Parallel venation and reticulate venation​

Q. The lines that are seen on the leaves of the plants are known as _______ .

1. chlorophyll
2. petioles
3. veins
4. petals

Q. Which of the following structure plays a key role in the exchange of gases between the plant and atmosphere?

1. Stomata
2. Lamina
3. Veins
4. Midribs

Q. Identify the part(s) of a leaf from the given.

1. Petiole
2. Midrib
3. Petals
4. Lamina

Q. Explain structure of a leaf in detail.

Q.

Are any two leaves identical?

Q. The part of the leaf which connects it to the stem or branch is called ____.

1. leaf blade
2. midrib
3. petiole
4. vein

Q.

Transpiration occurs through openings in leaves called

1. pores

2. guard cells

3. stomata

4. barks

Q. A well watered plant growing under sufficient sunlight was covered with the polythene and tied just above the roots. After 3 to 4 hours, it was observed that a lot water droplets were present inside the polythene bag. Which process may have contributed to this?

1. Pollination
2. Transpiration
3. Venation
4. Photosynthesis

Q. Give an example of the following and draw generalized diagrams for the same:​
(ii) Parallel Venation and Reticulate Venation​

Q.

Give reason for the following:

Antitranspirants can be used to keep cut flower fresh for a long time.

Q. Identify the type of venation present in a plant with a tap root system.

1. Reticulate
2. Parallel
3. Diagonal
4. Convergent

Q. Which of the following is the correct combination of root and venation type?

1. Tap root - Parallel venation
2. Tap root - Reticulate venation
3. Lateral root - Parallel venation
4. Fibrous root - Reticualte venation

Q. The thin rootlets on taproot are ___ .

Q. Transpiration in plants takes place through the .

1. stem
2. leaf
3. flower
4. root

Q. Observe the figure and attempt the questions that follow it.

(a) Label the parts (i), (ii), (iii) and (iv) in the figure.
(b) What types of venation does the leaf has?
(c) What type of venation is seen in grass leaves?

(iv) (iii) (ii) (i)

Q.

The broad green part of the leaf is called ____ (i) ____ and the stalk of the leaf is called ___(ii)____.

1. (i) Petiole, (ii) Midrib

2. (i) Midrib, (ii) Lamina

3. (i) Stomata, (ii) Petiole

4. (i) Lamina, (ii) Petiole

Q. Observe the figure and attempt the questions that follow it.
(a) Label the parts (i), (ii), (iii) and (iv) in the figure. (5 Marks)

Q. If a plant has fibrous root, what type of venation do its leaves have?

Q. Which of the function(s) is/are performed by the part of the plant shown in the following image?

1. Transpiration
2. Pollination
3. Photosynthesis
4. Water absorption

Q. Plants with reticulate venation have tap root system.

1. False
2. True