Transport of Molecules in Plant MCQs

Question 1

A widely accepted explanation for transport of sugar in phloem is called

Accepted Answer

pressure flow hypothesis

Answer

root pressure theory

Answer

transpiration

Answer

cytoplasmic streaming

Question 2

Phloem is composed of

Accepted Answer

sieve-tube elements and companion cells

Answer

vessel elements and companion cells

Answer

tracheids and vessel elements

Answer

tracheids and sieve-tube elements

Question 3

The movement of most minerals, including potassium into root cells is by

Accepted Answer

active transport

Answer

osmosis

Answer

diffusion

Answer

bulk flow

Question 4

The evaporation of water from leaves is called

Accepted Answer

transpiration

Answer

cohesion

Answer

tension

Answer

pressure flow

Question 5

Normally CO2 and O2 enter a plant by

Accepted Answer

diffusion

Answer

osmosis

Answer

active transport

Answer

evaporation

Question 6

The cohesion-tension theory of water movement helps to explain how water moves from soil into root?

Accepted Answer

Through the xylem

Answer

Through the phloem

Answer

From leaf to root

Answer

Into the guard cells

Question 7

When guard cells swell

Accepted Answer

stomata open

Answer

stomata close

Answer

photosynthesis stops

Answer

evaporation stops

Question 8

Water moves into roots of plants by

Accepted Answer

osmosis

Answer

active transport

Answer

diffusion

Answer

pressure flow mechanism