Phloem Transport

Q.

Leaves of a healthy potted plant were coated with vaseline. Will this plant remain healthy for long?

Q.

How does transpiration helps in upward transport of substance?

Q.

What is the function of transpiration

Q.

What is ascent of sap? Name the forces responsible for ascent of sap.

Q.

What is the ascent of sap?

Q.

What is a sucrose (in plants)?

Q.

The transport in xylem in usually unidirectional, whereas in phloem it is bidirectional.

1. True

2. False

Q.

Assertion: The phloem sap moves towards the sink.

Reason: The process of loading at the source produces a hypotonic condition in the phloem.

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

2. if A is true but R is false

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

4. if both A and R are false.

Q. Define ascent of sap.

Q.

Describe the Mass Flow Hypothesis for translocation of organic solutes (food) in plants.

Q.

Translocation of organic solutes primarily takes place through _____.

1. phloem

2. cortex

3. pith

4. xylem

Q.

Leaves of a healthy potted plant were coated with Vaseline to block the stomata. What will happen to yhoth plants after few days?

Q.

Downward movement of sap has the help of

1. In dim light.

2. Covered by a polythene bag.

3. Under the fan.

4. In the shade.

Q.

Name the following:

Translocation of water from root to shoot.

Q. In plants, glucose is derived from sucrose, which is the end product of photosynthesis or from storage carbohydrates. Sucrose is converted into glucose and fructose by the enzyme?

1. Hexokinase
2. Zymase
3. Sucrase
4. Invertase

Q.

Transpiration helps in

1. Uptake of water

2. Transport of minerals

3. Cooling effect

4. All of the above

Q.

Why xylems are deep seated in plant body?

1. Conduction of water and minerals from leaf to rest of body parts

2. Conduction of water and minerals from root to leaf

3. Conduction of prepared food from leaf to rest of body parts

4. Conduction of solutes from leaf to rest of body parts

Q. Leaves of healthy potted plant were coated with vasaline will the plant remain healthy for long

Q. Leaves of a healthy potted plant were coated with vaseline for long time. What will happen?

1. It will not get oxygen for respiration
2. It will not get carbon dioxide for photosynthesis
3. All of the above
4. Upward movement of water and minerals would be hampered due to lack of transpiration

Q. Girdling experiment cannot be performed in

1. Sugarcane
2. Mango
3. Rubber plant
4. Willows

Q. The removal of a ring of bark from trunk of a tree eventually kills it, since

1. Water cannot go up
2. Minerals salts cannot go up
3. Food does not travel down and roots are starved
4. The exposed part becomes infected with fungi

Q.

The correct sequence of events in nodule formation is:

1. Curling of root hairs - rapid division of cortical cells - production of infection thread - bacteria enters polyploidy cells - colonization of surrounding areas of roots

2. Rapid division of cortical cells - production of infection thread - curling of root hairs - colonization of surrounding areas of roots - bacteria enters polyploidy cells

3. Colonization of surrounding areas of roots - curling of root hairs - production of infection thread - rapid division of cortical cells - bacteria enters polyploidy cells

4. Colonization of surrounding areas of roots - rapid division of cortical cells - bacteria enters polyploidy cells - curling of root hairs - production of infection thread

Q. Which of the following isotopes would be useful in finding the path of translocation of food?

1. 
2. 
3. 
4. 

Q. Food material transport in plants occurs

1. Unidirectionally
2. Multidirectionally
3. No transport of food occurs in plants. Food is stored at the site where it is synthesized.
4. All

Q. Phloem sap is mainly made of ________________.

1. Oligosaccharides and hormones
2. Water and sucrose
3. Water and minerals
4. Sucrose only

Q. Direction of conduction of food through phloem is

1. From below upwards
2. From leaves to roots
3. From tip to bottom
4. Phloem never conducts food

Q.

Q1) why do dicot leaves have more number of stomata on their under surface.

Q2) differencee between i )photosynthesis and chemosynthesis and ii) photosythesis and respiration

Q. In phloem transport, the source-sink relationship is variable. Identify the statements in support of this.

1. Both b & c

2. Sugar stored in roots may be mobilized to buds in early spring

3. The direction of movement in phloem can be upwards on down wards i.e., bidirectional

4. Food is primarily transported as sources through phloem

Q. In phloem transport, the source-sink relationship is variable. Identify the statements in support of this.

1. Food is primarily transported as sources through phloem

2. Sugar stored in roots may be mobilized to buds in early spring

3. The direction of movement in phloem can be upwards on down wards i.e., bidirectional

4. Both b & c

Q. Loading of sucrose into sieve tube cells is by (i)_______ and the unloading of sucrose from the sieve tube cells is by (ii)________.

1. Active transport and passive transport

2. Passive transport and active transport

3. Active transport

4. Passive transport