Transport in plants

Question 1

where is the stomata located

Answer 1

lower epidermis of the leaf

Question 2

name all the layers of the leaf

Answer 2

lower epidermis
spongy mesophyll
palisade mesophyll
upper epidermis

Question 3

what is the role of the stomata

Answer 3

regulate gas exchange between the plant and environment and control of water loss by changing the size of the stomatal pore

Question 4

what is the function of the guard cell in the stomata

Answer 4

controls the rate of transpiration of the water by opening and closing the stomata

Question 5

what is the function of the xylem

Answer 5

transport water and minerals absorbed by the roots to the leaves and the stem of the plant

Question 6

05 features of the xylem tissue

Answer 6

• made of dead cells
• hollow tube which allows the water transportation easier
• strengthened by the substance
  called lignin
• only transport water in one
  way
• no end walls between the cells

Question 7

2 features about the pholem tissue

Answer 7

• made up of columns of living cells
• food substances are being transported both up and downwards

Question 8

what is the function of the phloem tissue

Answer 8

to transport food which are being produced by the photosynthesis in plant leaves to other parts of the plant ( storage organs)

Question 9

what is the meaning of translocation

Answer 9

transportation of food produced during the photosynthesis to the storage organs

Question 10

what is called the transpiration

Answer 10

loss of water in the xylem of the plant

Question 11

describe the transpiration stream

Answer 11

1. water is being evaporated through the stomata
2. water is now being taken up by the leaves from the stomata as there is a shortage of water
3. water is absorbed more by the roots as there is a shortage of water in the xylem tissue

Question 12

what are the factors that affect the rate of transpiration

Answer 12

• temperature
• light intensity
• air flow
• humidity

Question 13

how does the LIGHT INTENSITY affect the Rate of transpiration

Answer 13

increase in light intensity increases the rate of transpiration because evaporation of water from leaves is becoming higher if the light intensity increased.

Question 14

How does the TEMPERATURE
affect the rate of transpiration

Answer 14

increase in the temperature increases the rate of transpiration because of the high evaporation of water in the plants.

Question 15

How does the HUMIDITY affect the rate of transpiration

Answer 15

Increase in the humidity decreases the rate of transpiration because when there’s high humidity in the surrrounded area of the plant ,it won’t replace or difffuse water molecules as there are higher concentration of water molecules

Question 16

how does the AIR FLOW affect the rate of transpiration

Answer 16

high air flow increases the rate of transpiration.
this is because the wind flow moves away causing a higher rate of transpiration as it removes the water molecules around the leaf. So according to the concentration gradient the water will be moving from the higher concentration reigion to the lower concentration reigion

Question 17

what are the uses of transpiration

Answer 17

-transport water for photosynthesis
-keeps leaves turgid
-cools the leaf
- transport mineral ions

Question 18

what is called osmosis

Answer 18

the transportation of water molecules according to the concentration gradient- higher concentration region to lower concentration region.

Question 19

what is diffusion

Answer 19

when substances move through the permeable membrane from higher concentration area to lower concentration area

Question 20

what is active transport

Answer 20

the movement of substances against the concentration gradient- from lower concentration area to higher concentration area.

Question 21

which method is used by plant root hair cells to absorb water from soil

Answer 21

osmosis - water concentration is higher in soil than the water concentration in root cell

Question 22

which method is being used by the plants to absorb minerals from the soil

Answer 22

active transport- the mineral concentration is higher in the root cell than the mineral concentration in soil

Question 23

Investigation to calculate the transpiration- portometer-describe the independant, dependant and control variables

Answer 23

IV- time
DV- distance moved by the bubble in the capillary
CV- temperature ,light intensity