Phloem Transport

Q. What is ment by gridling experiment?

Q. Phloem sap contains _________.

1. water
2. sucrose
3. hormones
4. galactose

Q.

What are the characteristics of phloem?

Q.

Which of the following is made up of dead cells?

1. Xylem parenchyma

2. Collenchyma

3. Phellem

4. Phloem

Q.

What is difference between transportation and translocation?

Q.

What are the 3 main types of plant tissue?

Q.

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

1. Food is primarily transported 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 or downwards i.e., bidirectional

4. Movement of pholem sap is always downwards

Q. Girdling shows that phloem is the tissue responsible for translocation of food and that take place in one direction that is towards the root. Do phloem conduct in only one direction????

Q. Statement 1: The translocation of food is always from source to sink.
Statement 2: Translocation in phloem is bidirectional.

1. Statement 1 and Statement 2 are correct
2. Statement 1 and Statement 2 are wrong
3. Statement 1 is correct and Statement 2 is wrong
4. Statement 1 is wrong and Statement 2 is correct

Q.

Is phloem fibre a dead or living tissue?

Q.

Which Tissue Is Present in Veins of Leaves?

Q. Lignin is the important constituent in the cell wall of

1. parenchyma
2. xylem
3. phloem
4. cambium

Q. Who among the following conducted an experiment to show that phloem is the tissue responsible for translocation of food?

1. Marcello Malpighi
2. Ernst Munch
3. Jan Ingenhousz
4. Dixon and Jolly

Q. Major components of phloem sap are _______.

1. Water and sucrose
2. Sugars and hormones
3. Sucrose and amino acids
4. Minerals and sugars

Q. Phloem sap contains _________.

1. water
2. sucrose
3. hormones
4. galactose

Q. Assertion: Phloem transports solutes towards the sink.
Reason: Turgor pressure helps in the movement of sap through the phloem.

1. Both A and R are correct. But R is not the correct explanation of A
2. Only A is correct
3. A is correct and R is the correct explanation of A
4. Both A and R are incorrect

Q.

Transportation of food in plants is also called translocation.

1. True
2. False

Q.

The phloem fibres are also called _____.

Q. Which of the following is not a purpose of transpiration?

1. Supplies water for photosynthesis
2. Helps in translocation of sugars from source to sink
3. Cools leaf surface
4. Transports minerals from the soil to all parts of the plant.

Q. Consider the following statements regarding the fate of a ring girdled plant and choose the most appropriate answer.

1. Both the shoot and root of a ring girdled plant die together.
2. The root of the plant dies first followed by the shoot.
3. The shoot of the plant dies first followed by the root.
4. Neither the root nor the shoot will die.

Q.

Assertion: Transpiration lowers down plant temperature. ​

Reason: Transpiration reduces the concentration of mineral salts. ​

Q.

Diffusion participates in which of the following processes

1. Exit of water vapour from leaves during transpiration

2. All the above

3. Entry of CO₂ into leaves during photosynthesis

4. Dissolution of KMNO₄ crystal in water

Q.

Phloem helps in the upward conduction of water.

1. True
2. False

Q.

Phloem is a vessel in plants which carries

1. food and minerals to leaves from roots

2. prepared food to other parts from roots

3. food and minerals to roots from leaves

4. prepared food to other parts from leaves

Q. Flax and hemp are fibres obtained from

1. pericarp
2. xylem
3. phloem
4. cortex

Q. (a) What is respiration?
(b) Draw a labelled diagram of cross section of leaf.
(c) Explain the transportation of food and other substances in plants.

Q. Which of the following helps in translocation of food in plants?

1. Scelerenchyma
2. Phloem
3. Xylem
4. Collenchyma

Q.

Give reason:

Absorption of water by plants also depends on transpiration.

Q. Food is transported to different parts of plant through

1. Xylem
2. Phloem
3. Pith
4. Cortex

Q. The girdling or ringing experiment involved

1. Tying a metallic ring to a stem
2. Marking a ring shaped area on the stem
3. Removal of a ring of tissue external to xylem
4. None of the above.