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Which of the following exactly depicts the process of translocation in plants?

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Question

Which of the following exactly depicts the process of translocation in plants?

A

Physiologic loading of sucrose into phloem.

B

Unloading sucrose at the sink.

C

Control of pressure flow of the sap in the phloem driven by osmosis.

D

All of the above.

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Correct option is D)

In a flowering plant the substances that would need to be transported are water, mineral nutrients, organic nutrients and plant growth regulators. Over small distances substances move by diffusion and by cytoplasmic streaming supplemented by active transport. Transport over longer distances proceeds through the vascular system (the xylem and the phloem) and is called translocation. Special long distance transport systems become necessary so as to move substances across long distances and at a much faster rate. Water and minerals, and food are generally moved by a mass or bulk flow system. Mass flow is the movement of substances in bulk from one point to another as a result of pressure differences between the two points. It is a characteristic of mass flow that substances, whether in solution or in suspension, are swept along at the same pace, as in a flowing river. This is unlike diffusion where different substances move independently depending on their concentration gradients. Bulk flow can be achieved either through a positive hydrostatic pressure gradient (e.g., a garden hose) or a negative hydrostatic pressure gradient (e.g., suction through a straw). When sugars and other nutrients arrive in sink tissues they unload from the phloem and enter surrounding cells, either through plasmodesmata or by crossing from one cell to another across the cell walls. The size and metabolic activity of the different sinks determines the amount of material that is delivered to them. Thus, the use of sugar in the sinks determines how much sugar flows to them.

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Over small distances, substances moved by

Over small distances, substances moved by A. Diffusion B. Cytoplasmic streaming C. Active transport D. All of the above

Over small distances, substances moved by

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Over small distances, substances moved by

Over small distances substances move by diffusion and cytoplasmic streaming supplemented by active transport.

Home > English > Class 11 > Biology > Chapter > Transport In Plants >

Over small distances, substanc...

Over small distances, substances moved by

Updated On: 27-06-2022

( 00 : 20 )

Video Solution: Over small distances, substances moved by

ADVERTISEMENT Text Solution Open Answer in App A Diffusion B

Cytoplasmic streaming

C Active transport D All of the above Answer

The correct Answer is D

Solution

Over small distances substances move by diffusion and cytoplasmic streaming supplemented by active transport.

Answer

Step by step video & image solution for [object Object] by Biology experts to help you in doubts & scoring excellent marks in Class 11 exams.

Question Details till 27/12/2022

Question

Over small distances, substances moved by

Chapter Name Transport In PlantsSubject Biology (more Questions)Class 11thType of Answer Video & ImageQuestion Language

In Video - English In Text - English

Students Watched 900 +Students Liked 200 +Question Video Duration 4m1s

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