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การขนส่งในพืช

Total questions: 25

Worksheet time: 16mins

Name
Class
Date
1.
The plant tissue that carries food materials DOWNWARD from the leaves to the rest of the pant is the ______.
a)
Phloem
b)
Stomata
c)
Chlorophyll
d)
Xylem
2.
what is the function of root hair?
a)
it is place to store the food
b)
it has large surface area to absorb more water
3.
How do water enter the roots from the soil?
a)
diffusion
b)
osmosis
c)
transpiration
d)
active transport
4.
Transpiration is
a)
the movement of water through a plant from the roots up the stem
b)
the loss of water from the leaves of a plant by the process of evaporation
c)
the flow of water into plant roots by osmosis from the soil
d)
the process of minerals and sugars moving through plant veins
5.
Why is the evaporation of water from leaves important?
a)
It cools leaves and helps move water up the plant.
b)
It makes the plant wilt
c)
It helps the plant to respire
6.

What do the guard cells do?

a)

Control active transport

b)

Control nutrients moving into the cell

c)

Controls the rate of transpiration (loss of water through the leaf)

7.

What does phloem transport?

a)

Water

b)

Minerals

c)

Fruit

d)

Sugar

8.

What is the main factor that influences the rate of sugar transport?

a)

movement of water

b)

Rate of photosynthesis

c)

capillary action

d)

uprooting plants

9.
Xylem vessel elements are strengthened by
a)
lignin
b)
cellulose
c)
melanin
d)
pericycle
10.
How will lowered humidity affect the rate of transpiration?
a)
decrease it
b)
increase it
c)
no change
d)
it depends
11.
An increase in wind or temperature will ________________ transpiration
a)
increase
b)
decrease
c)
no change
d)
none
12.

The rate of translocation in the phloem was observed to decrease steadily after a plant was placed in an environment without oxygen for several minutes. Why did this happen?

a)

The cells in the plants stop respiring.

b)

The xylem no longer takes in water for the plant.

c)

Active transport of mineral salts can no longer occur.

d)

The plant can no longer synthesize sugars to provide energy.

13.
Why does temperature have an effect on the rate of photosynthesis?
a)
Higher temperature allows carbon dioxide to diffuse into the leaves faster.
b)
Higher temperature allows water to be transported to the leaves faster.
c)
Higher temperature allows the stomata to open wider.
d)
Higher temperature allows the enzymes to function better.
14.
Most stomata are usually found in underside of leaves.  Why?
a)
conserve water
b)
get more CO2
c)
prevent infection
d)
none
15.
Phloem is made from living cells called
a)
sieve tube elements
b)
vascular bundles
c)
paranchema
d)
collenchyma
16.
Plants that live in places where water supply is short are called
a)
epiphytes
b)
xerophytes
c)
dicots
d)
monocots
17.
in apoplastic pathway, water moves through the 
a)
plasmodesmata
b)
cell wall
c)
mesophyll
d)
sieve tube elements
18.
A cross-like structure is indicative of a 
a)
root
b)
stem
c)
branch
d)
leaf
19.
assimilates or sugars, move from one part of the plant to another by
a)
transpiration
b)
translocation
c)
evacuation
d)
innundation
20.

Sink is any cell that _______.

a)

stores sugar

b)

makes sugar

c)

excretes sugar

d)

give sugar

21.
cells of the xylem of dead
a)
true
b)
false
22.
guard cells change shape and open the stomata as they become
a)
flacid
b)
turgid
c)
larger
d)
smaller
23.
Waxy covering of leaves
a)
cuticle
b)
epidermis
c)
endodermis
d)
pericycle
24.
Xylem vessel elements are strengthened by
a)
lignin
b)
cellulose
c)
melanin
d)
pericycle
25.
Which cells act as packing tissue and have many metabolic functions
a)
parenchyma
b)
collenchyma
c)
mesophyll
d)
vascular tissue

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