Transport in Plants

Question 1

Define Osmosis?

Answer 1

Net Movement of molecules from a high water concentration to a low water concentration across a semi-permeable membrane

Question 2

How do plants get water?

Answer 2

Through Root Hair Cells

Question 3

Give the adaptations of root hair cells (RHC)?

Answer 3

Large SA
High amount of mitochondria
Don’t Contain Chloroplasts

Question 4

What two processes take place for RHC to absorb water and minerals?

Answer 4

Osmosis
Active Transport

Question 5

What tube in the plant takes water up to the leaves and rest of the plant?

Answer 5

The Xylem

Question 6

What does the Xylem do?

Answer 6

Transports water and minerals to the rest of the plant as well as providing physical support

Question 7

What reactions take place in the leaf which requires water?

Answer 7

Photosynthesis

Question 8

Define transpiration?

Answer 8

The evaporation of water from the leaves of the plants

Question 9

How can transpiration be sped up?

Answer 9

Through heat, wind or humidity

Question 10

What molecule is stored and used in leaves?

Answer 10

Glucose

Question 11

What vessel moves minerals and sugars to the RHC?

Answer 11

Phloem

Question 12

Name all 7 parts of a leaf cell?

Answer 12

Waxy Cuticle
Upper epidermis
Palisade Mesophyll
Spongy Mesophyll
Stomata
Guard Cell
Lower Epidermis

Question 13

Which part of the leaf is responsible for water loss?

Answer 13

Stomata

Question 14

What occurs through the stomata?

Answer 14

Gas Exchange

Question 15

What helps the stomata open and close?

Answer 15

Guard cells

Question 16

When do guard cells open the stomata?

Answer 16

When they are turgid

Question 17

When do the stomata open and why?

Answer 17

In the day, because there is a high amount of photosynthesis occurring meaning O2 and H2O have to be exchanged

Question 18

When do the guard cells close the stomata?

Answer 18

When they are flaccid

Question 19

When do the stomata close and why?

Answer 19

In the night as there is no photosynthesis occurring or when too much water is lost

Question 20

What can be used to measure rate of transpiration?

Answer 20

A Potometer

Question 21

Give all 6 steps of setting up a potometer?

Answer 21

1. Cut stem diagonally UNDERWATER
2. Check for air leaks
3. Record where air bubble starts
4. Record where air bubble finishes after a given time
5. Repeat experiment
6. Calc Volume of water loss: millimetres (length) /time)