Root Pressure

Q. Go through the four statements given beIow:
I. Root pressure provides a light push in the overall process of water transport.
II. Most plants meet their water need by transpiration pull.
III. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecule in the xylem vessel which often break under enormous tension created by transpiration.
IV. Guttation is the cause of transpiration pull.

The correct statements are

1. I, II, 111, IV
2. I, II, Ill
3. II, Ill, IV
4. II, Ill

Q.

The instrument used for measuring the rate of transpiration is

1. Photometer

2. Potometer

3. Porometer

4. Lactometer

Q. Root pressure develops due to

1. passive absorption
2. active absorption
3. increase in transpiration
4. facilitated diffusion

Q. Root pressure is maximum when

1. transpiration is high and absorption is very low
2. transpiration is very high and absorption is also high
3. transpiration is very low and absorption is high
4. transpiration and absorption both are low

Q. Symplast pathway of water in plants is not related to

1. vacuolar path
2. cytoplasm
3. plasmodesmata
4. cell wall

Q.

What role does root pressure play in water movement in plants?

Q. To obtain virus free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?

1. Palisade parenchyma
   
2. Epidermis only
   
3. Apical meristem only
   
4. Both apical and axillary meristems
   

Q.

Root Hair absorbs water from the soil through

1. Turgor pressure

2. Ion exchange

3. Osmosis

4. DPD

Q. Meristem culture is practised in horticulture to get

1. Haploid plants
2. Slow growing cultures
3. Somaclonal variations
4. Virus free plants

Q. Interfascicular cambium and cork cambium are formed due to

1. Cell division
2. Cell dedifferentiation
3. Cell differentiation
4. Redifferentiation

Q. What are the structural characteristics of

a. Meristematic cells near root tip

b. The cells in the elongation zone of the root

Q.

Vacuoles are absent in merismatic plant cells.

1. True
2. False

Q.

What role does root pressure play in water movement in plants?

Q. Root pressure is maximum when:

1. Transpiration is high and absorption is very low
2. Transpiration is very low and absorption is high
3. Both transpiration and absorption are low
4. Transpiration is very high and absorption is also high

Q. Casparian strips resists ____________ movement of water.

1. symplastic
2. apoplastic
3. vacuolar
4. transcellular

Q. All given factors promote absorption of water by roots, except-

1. Well aerated soil
2. Highly concentrated soil solution
3. Optimum soil temperature
4. Available water in soil

Q. Root pressure develops due to

1. passive absorption
2. active absorption
3. increase in transpiration
4. facilitated diffusion

Q. Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiological or anatomical abnormality? Explain in detail.

Q. Explain in 2-3 lines each of the following terms with the help of examples taken from different plant tissues.

a.Differentiation

b.De-differentiation

c.Redifferentiation

Q. The following is/are exclusively associated with the pulling of water in vessels by creating a negative pressure, except:

1. Root pressure
2. Capillarity and tensile strength
3. Transpiration
4. Cohesion and adhesion

Q. What is root pressure? How is it useful to plants?

Q.

Name the process/term for the statements given below:

The process in which intact plant lose water in the form of water droplets.

Q.

Assertion: Root pressure can provide a modest pull in the overall water transport in plants.

Reason: It does play an important role in water movement in tall trees.

1. if both A and R are false.

2. if both A and R are true but R is not the correct explanation of A

3. if both A and R are true and R is the correct explanation of A

4. if A is true but R is false

Q. Set up an experiment to demonstrate root pressure.

Q. Root pressure is maximum when

1. Transpiration is high and absorption is very low
2. Transpiration is very low and absorption is high
3. Transpiration is very high and absorption is also high
4. Transpiration and absorption both are slow

Q. In the given T.S of root, what are part A, B and C?

1. A- Transmembrane, B- Capillary, C- Endodermis
2. A- Vacuolar path, B- membrane pathway, C-Casparian strips
3. A- Symplast, B- Apoplast, C- Casparian strip
4. A- Apoplast, B-Symplast, C- Endodermis

Q. When stem of a herbaceous plant is cut, water or sap oozes out, this is due to?

1. Guttation
2. Transpiration pull
3. Root pressure
4. Imbibition

Q. The diagram shows four different cells. Which cells provide a large surface area for absorption?

1. 1 and 2
2. 1 and 3
3. 2 and 4
4. 3 and 4

Q. Define:
(i) Radial vascular bundle (ii) Rigor mortis (iii) Root pressure

Q. Match the names of the experiments listed under column I with the aim of the experiment given under column II. Choose the answer which gives the correct Combination of the alphabets.
$\begin{array}{cc}ColumnI& ColumnII\\ A.Girdlingexperiment& 1.Translocationinphloem\\ B.Cobalt-chloridepapermethod& 2.Unequaltranspirationonleafsurfaces\\ C.Crescograph& 3.Growth\\ D.Bell-jarexperiment& 4.Transpiration\end{array}$

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