Lenticular Transpiration.

Q.

Where are the lenticels present in a plant?

1. Leaf

2. Flower

3. Root

4. Stem

Q.

What are lenticels? Mention their functions.

Q.

Is there presence of stomata at the upper surface of the leaves?

Q.

What is lenticular transpiration ? Mention one major difference between lenticular transpiration and stomatal transpiration.

Q.

Most of the transpiration in tall trees occurs through

(a) Stomata (b) Lenticels

(c) Cuticle (d) Bark

Q.

Choose the decreasing order of the rate of transpiration?

1. Cuticular transpiration > Lenticular transpiration > Stomatal transpiration
2. Stomatal transpiration > Lenticular transpiration > Cuticlular transpiration
3. Lenticular transpiration > Stomatal transpiration > Cuticular transpiration
4. Stomatal transpiration > Cuticular transpiration > Lenticular transpiration

Q.

One of the internal factors which affect the rate of transpiration is

(a) big size of the leaf (b) colour of the leaf

(c) sunken stomata (d) sunny day

Q.

Does transpiration take place in flowers

Q.

Give scientific reason:

In the hot summer months, the leaves of herbaceous plants wilt at noon.

Q.

What are the two factors stomata depends upon to open and close guard and subsidiary cells alternately?

1. Turgidity and cell sap pressure

2. Turgidity and flaccidity

3. Transpiration and capillary action

4. Surrounding moisture and cell sap pressure

Q.

Match the parts of the Nephron.

1. 1-Thin descending limb 2-Thin ascending limb 3-Thick ascending limb 4-Distal convoluted tubule

2. 1-Thick ascending limb 2-Thin ascending limb 3-Distal convoluted tubule 4-Thin descending limb

3. 1-Thick ascending limb 2-Thin descending limb 3-Thin ascending limb 4-Distal convoluted tubule

4. 1-Distal convoluted tubule 2-Thin ascending limb 3-Thick ascending limb 4-Thin descending limb

Q.

Name the Following:

The waxy layer on the epidermis of the leaf meant to reduce transpiration.

Q.

In plants, certain pores in the bark are called ___ .

1. lenticels

2. mesophyll cells

3. stomata

4. cuticle

Q.

Give the exact location of the following:

Lenticels

Q. After leaf falls in the autumn, which of the following is the only site of water loss in deciduous trees?

Q. Name the wax-like layer on the epidermis of leaves which reduces transpiration.

Q.

Which of the following are characters of a lenticel?

1. They develop in the older stems.

2. They are always open.

3. Lenticular transpiration is greater than cuticular transpiration.

4. They are open only during the day.

Q. What is lenticels?

Q. In a plant organ which is covered by periderm and in which the stomata are absent, gaseous exchange takes place through

1. Aerenchyma
2. Lenticels
3. Trichomes
4. Pneumatophores

Q.

Name the following.

A waxy layer on the epidermis of the leaf is meant to reduce transpiration.

Q. Lenticular transpiration takes place in

1. Fruits
2. Leaves
3. All of the above
4. Woody stem

Q. Give the exact location of the lenticels.

Q. Match the items of Column I with items in Column II.

	Column I		Column II
A.	Stomata	1.	In woody part
B.	Lenticels	2.	Release in night
C.	$C{O}_2$	3.	In herbaceous stem
D.	$O_2$	4 .	Release in day

1. A- 3, B- 1, C- 2, D- 4
2. A- 2, B- 1, C- 3, D- 4
3. A- 3, B- 1, C- 4, D- 2
4. None of these

Q.

What are the opening on the barks of older stems called?

Enter 1 word only.

Q. Most of the transpiration in tall trees occurs through

1. Stomata
2. Lenticles
3. Cuticle
4. Bark

Q.

Differentiate between the transpiration and guttation on the basis of structures involved.

Q. Select the incorrect statement regarding lenticels.

1. Consist of only dead cells
2. Found in most of the woody trees
3. Permit the exchange of gases
4. Lens shaped opening

Q. Study the following model with which the transpiration mechanism in plants can be demonstrated. With which structure of the plant do you compare each of the following?
(i) Sponge
(ii) Glass tube filled with water.

Q. Respiration in the woody stem of a plant takes place through

1. Lenticels
2. Bark
3. Stomata
4. None of the above

Q. Main function of lenticel is

1. Gaseous exchange
2. Bleedling
3. Guttation
4. Transpiration