Photosynthesis

Question 1

What is the calculation for photosynthesis?

Answer 1

carbon dioxide + water -> oxygen + glucose

Question 2

What is photosynthesis

Answer 2

the process by which a plant uses light energy to synthesis organic molecules.

Question 3

Function of Cuticle

Answer 3

Prevents excessive water loss and damage

Question 4

Function of upper epidermis

Answer 4

Produces and secretes the waxy substance that makes up the cuticle.

Question 5

Function of palisade layer

Answer 5

Contain lots of chloroplasts- main site of photosynthesis for the leaf

Question 6

Function of spongy layer

Answer 6

Facilitates diffusion of gases into/ out of the leaf.

Question 7

Function of lower epidermis

Answer 7

•Facilitates majority of gas exchange in the leaves

• Regulates loss of water from the leaf

Question 8

xylem vessels

Answer 8

Vascular tissue that transports water and mineral ions from the roots to the
leaves. Also provides structural support to the plant.

Question 9

Phloem vessels

Answer 9

Vascular tissue that transports nutrients (sugars and amino acids) to other parts of the plant.

Question 10

Testing leaf for starch

Answer 10

•Boil the leaf - Breaks open the cell membranes for removal of chlorophyll; also kills the leaf to stop any further chemical reactions.
•Add the leaf to heated ethanol- Ethanol will dissolve the chlorophyll, removing the green colour
from the leaf- this will help identify a distinct colour change
when testing with iodine.
•Dip the leaf back in water - This will rehydrate and soften the leaf, it can now be spread out
on a white tile.
•Add iodine - If starch is present iodine will turn from orange-brown to a blue-
black colour. If no starch is present there will be no colour
change.

Question 11

Where does photosynthesis take place

Answer 11

in the palisade cell