Stomata

Q.

What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

Q. Through an experiment show how $C{O}_2$ is essential for photosynthesis.

Q. Explain the mechanism of opening and closing of stomata.

Q. Specialised epidermal cells surrounding the guard cells are called

1. complementary cells
2. subsidiary cells
3. bulliform cells
4. lenticels

Q. Stomata is part of the _________ tissue system.

1. ground
2. epidermal
3. vascular
4. conducting

Q. In an experiment, a student cuts a transverse section of a young stem of a plant which he has taken from his school garden. After observing it under the microscope how would he ascertain whether it is a monocot stem or a dicot stem?

1. With the help of bulliform cells
2. With the help of casparian strips
3. With the help of vascular bundles
4. With the help of stomatal apparatus

Q.

What is the shape of guard cells in grasses?

Q. The diagram below represents a cross section of a leaf. Which region serves primarily to regulate the stomatal opening?

1. A
2. B
3. C
4. D

Q. Stomata is part of the _________ tissue system.

1. vascular
2. epidermal
3. ground
4. conducting

Q. The sugarcane plant has

1. dumb-bell shaped guard cells
2. tap-root system
3. reticulate venation
4. open vascular bundle

Q.

How are the xylem and phloem arranged in plant roots?

1. Evenly spaced out across the root

2. In bundles near the edge of the root

3. In the centre of the root

4. periphery

Q. How do the guard cells regulate opening and closing of stomatal pores?

1. Turgid guard cells causes opening of stomata
2. Turgid guard cells causes closing of stomata
   
3. Flaccid guard cells causes closing of stomata
4. Both A and C

Q. Write the two main functions of the leaves.​

Q. The specialised epidermal cells present in the vicinity of guard cells are called

1. bulliform cells
2. subsidiary cells
3. companion cells
4. endodermal cells

Q. Choose the correct combination of labeling of stomatal apparatus of dicot and monocot leaves.

1. A – Epidermal cells B – Subsidiary cells C – chloroplast D – Guard cells E – Stomatal aperture
2. A – Epidermal cells B – Guard cells C – chloroplast D – subsidiary E – Ctomatal aperture
3. A – Epidermal Cells B – Subsidiary cells C – Chloroplast D – Stomatal aperture E – Guard cells
4. A – Subsidiary cells B – Epidermal cells C – chloroplast D – stomatal aperture E – Guard cells

Q. A diagrm of stomatal apparatus is given alongside. Select the option where the alphabets correctly indicate the parts

1. A = subsidiary cells, B = guard cells C = nucleus, D = stomatal aperture
2. A = guard cells, B = vacuoles, C = chloroplast, D = cell sap
3. A = subsidiary cells, B = guard cells, C = chloroplast, D = stomatal pore
4. A = guard cells, B = subsidiary cells, C = chloroplast, D = vacuole

Q. The functions of the stomata does not include ________.

1. intake of carbon dioxide
2. removal of oxygen
3. guttation
4. loss of water vapour

Q.

What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

Q. Describe briefly, the mechanism of stomatal opening and closing.

Q. Who proposed that opening and closing of stomata is connected with the change in pH of guard cells?

1. Lloyd
2. Von Mohl
3. Sayre
4. Levitt

Q. Which photoreceptor controls the opening & closing of stomata?

1. Chlorophylls a
2. Chlorophylls b
3. Phytochrome
4. Carotene

Q. Guard cells are found in

1. Stomata
2. Hydathodes
3. None of the above
4. Both of the above

Q. Fill in the blanks by using appropriate words.

(v) In a young plant body pores in epidermis help in exchange of gases, whereas in a woody plant bodyare the pores for exchange of gases.

Q. Which of the following facilities opening of stomatal aperture?

1. Contraction of outer wall of guard cells
2. Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells
3. Decrease n turgidity of guard cells
4. Radial orientation of cellulose microfibrils in the cell wall of guard cells

Q. The sugarcane plant has

1. dumb-bell shaped guard cells
2. tap-root system
3. reticulate venation
4. open vascular bundle

Q. The direct reason for the opening of stomata is

1. turgidity of guard cells
2. root pressure
3. guttation
4. flaccidity of guard cells

Q. Minute openings present on undersurface of leaves are known as .

Q. The inner wall of guard cell is not :

Q.

Identify the errors in given statements.
Mature leaves have lenticels for exchange of gases.

Q. Thin and elastic walls of guard cells are

1. Inner
2. Inner and lateral
3. Outer
4. Outer and lateral