Transpirational Pull

Q.

What are the 3 adaptations that allow plants to prevent water loss?

Q.

Describe the internal structure of the Funaria capsule.

Q.

Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?

Q.

Why does transpiration increase with temperature?

Q.

The upward movement of water and minerals to the leaves is called

1. Ascent of sap

2. Decent of sap

3. Inflow of sap

4. Outflow of sap

Q. $\left(a\right)$ How water is transported to various parts of the plant. Is the water movement active, or is it still passive?

$\left(b\right)$ Since the water has to be moved up a stem against gravity, what provides the energy for this?

Q.

Differentiate between the following:

Transpiration and photosynthesis

Q. The positive pressure which can be responsible for pushing up water to small heights in the stem is:

1. Imbibition
2. Plasmolysis
3. Root pressure
4. Transpiration

Q.

Given below is a group of five terms. Arrange and rewrite the terms in correct order so as to be in a logical sequence.

Spongy cells, upper epidermis, stoma, palisade tissue, substomatal space.

Q. Which one is against the theory of ascent of sap given by Dixon and Jolly?

1. Pores in tracheary elements
2. Cohesion force of water molecules
3. Adhesion force of water molecules
4. Requirement of ATP

Q.

Transpiration pull will be maximum under which of the following conditions?

1. Open stomata, high humid atmosphere, and dry soil
2. Closed stomata, low light intensity, and humid atmosphere
3. Open stomata, high intensity of light and well-irrigated soil
4. Closed stomata, low light intensity and humid atmosphere

Q.

Describe transpiration pull model of water transport in plants. What are the factors influencing transpiration? How is it useful to plants?

Q. Cohesion - Tension - Transpiration Pull model of water transport was proposed by ______.

1. Dixon
2. Joly
3. Levitt
4. Mayer

Q. Ascent of sap through xylem due to transpiration pull depends upon

1. mutual attraction between water molecules
2. attraction of water molecules to other polar molecules
3. surface tension
4. all of the above

Q. The force responsible for upward movement of water against gravity comes from

1. transpiration
2. translocation
3. respiraton
4. photosynthesis

Q. The water absorption in plants is enhanced by

1. increased in transpiration
2. decreased in transpiration
3. decreased in salt absorption
4. increased photosynthesis

Q. Define : Stomata / Transpiration / Starch - sugar interconversion.

Q.

______ are minute pores on the surface of leaves.

Q. Match List - I with List -II


$\begin{array}{cccc}& \text{List - I}& & \text{List - II}\\ \text{(a)}& \text{Cohesion}& \text{(i)}& \text{More attraction in}\text{liquid phase}\\ \text{(b)}& \text{Adhesion}& \text{(ii)}& \text{Mutual attraction}\text{among water molecules}\\ \text{(c)}& \text{Surface tension}& \text{(iii)}& \text{Water loss in liquid phase}\\ \text{(d)}& \text{Guttation}& \text{(iv)}& \text{Attraction towards}\text{polar surfaces}\end{array}$

Choose the correct answer from the options given below :

1. $\left(a\right):\left(ii\right);\left(b\right):\left(i\right);\left(c\right):\left(iv\right);\left(d\right):\left(iii\right))$
2. $\left(a\right):\left(ii\right);\left(b\right):\left(iv\right);\left(c\right):\left(i\right);\left(d\right):\left(iii\right))$
3. $\left(a\right):\left(iv\right);\left(b\right):\left(iii\right);\left(c\right):\left(ii\right);\left(d\right):\left(i\right))$
4. $\left(a\right):\left(iii\right);\left(b\right):\left(i\right);\left(c\right):\left(iv\right);\left(d\right):\left(ii\right))$

Q.
Describe the path of ascent of sap due to transpiration pull

Q. The most widely accepted theory that explains the ascent of sap in tall trees is

1. Root pressure theory
2. Cohesion tension transpiration theory
3. Mass flow hypothesis
4. Both a and b

Q. Under what conditions do plant transpire (a) more quickly and (b) most slowly?

Q. Cohesion transpiration pull theory of ascent of sap was proposed by

1. Munch
2. Stephen Hales
3. Dixon and Joly
4. Bose

Q. Which one is against the theory of ascent of sap given by Dixon and Jolly?

1. Pores in tracheary elements
2. Cohesion force of water molecules
3. Adhesion force of water molecules
4. Requirement of ATP

Q.

Out of transpiration, guttation, and bleeding, which is/are not natural processes?

Q. The water absorption in plants is enhanced by

1. increased in transpiration
2. decreased in transpiration
3. decreased in salt absorption
4. increased photosynthesis

Q. Transpiration and root pressure cause water to rise in plants by:

1. Pushing and pulling it, respectively
2. Pulling it upward
3. Pulling and pushing it, respectively
4. Pushing it upward

Q. Cohesion and adhesion theory, is otherwise called

1. Transpiration pull theory
2. Relay pump theory
3. Root pressure theory
4. Pulsation theory

Q. More transpiration occurs from the lower surface of a dorsiventral leaf. Give suitable explanation.

Q. Plants factors that affect transpiration include

1. Humidity
2. Distribution of stomata
3. Canopy structure
4. Water status of the plant
5. All of the above