Phloem Transport

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

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

Q.

what in sieve cell ?why it is only present in gymnosperm/

Q. Transport in xylem is always while transport in phloem is .

1. unidirectional
2. bidirectional
3. towards apex
4. lateral

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

1. $O^{18}$
2. $P^{32}$
3. $C^{14}$
4. $N^{15}$

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

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

Q.

Munch hypothesis is based on

1. Translocation of food due to imbibition force.

2. Translocation of food due to TP gradient and imbibition force.

3. Translocation of food due to Turgor Pressure (TP) gradient.

4. None of these

Q.

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

Q. Meaningful girdling (ringing) experiment cannot be done on sugarcane because

1. Plants are very delicate.
2. It can not tolerate the injury.
3. Vascular bundles are scattered.
4. Phloem is present inside the xylem.