6. Plant Nutrition

Question 1

Describe photosynthesis

Answer 1

the process by
which plants synthesise carbohydrates from raw
materials using energy from light

Question 2

Word equation and chemical equation of photosynthesis

Answer 2

6CO2 + 6H2O → C6H12O6 + 6O2

carbon dioxide + water → glucose + oxygen
in the presence of light and chlorophyll

Question 3

Explain chlorophyll

Answer 3

chlorophyll is a green pigment that is
found in chloroplasts it transfers energy from light
into energy in chemicals, for the synthesis of
carbohydrates

Question 4

Use of carbohydrates (glucose) in plants

Answer 4

Turned to starch as an energy store
Turned to cellulose to build cell walls
glucose used in respiration to provide energy
Turned to sucrose for transport in the phloem
nectar to attract insects for pollination

Question 5

Explain the importance of nitrate ions and magnesium ions

Answer 5

. Nitrate ions-to male amino acid
D-weak growth yellow leaves

Magnesium ions- to make chlorophyll
D- m yellowing of leaves

Question 6

Explain how leaves are adapted for photosynthesis

Answer 6

.large s.a
Large amount of slight can fall onto leaves
Increases diffusion rate of carbon dioxide

Thin
Sunlight can inter easily
Gas exchange easy
Helps coz reach all cells quickly

Question 7

Draw structure of leatf with 10

Question 8

Explain now leat structures lindivisually are adapted for photosynthesis

Answer 8

upper epidermis sevetes a waxy substance which is water proof. It reduces quantity of water vapour escaping
Palisade mesopul- tall, elongated columns tightly packed with clorophlast for photosynthesis.
spongy mesophyll - contain airspaces for diffusion of carbon dioxide & oxygen
Stomata - openings to allow gas exchange
Gaurdcell- help control opening and closing Of Stomata

Question 9

Factors affecting photosynthesis
What is ,imiting factor

Answer 9

Supply of coz and water
Quantits of sunlight
Terperutur

Factor which is short in supply, stopping the activity to happen at a faster rate

Question 10

Mow does starch found in roots of grass support grass growth

Answer 10

Glucose is stoved as starch in plant cells, Enersy is released from glucose durving respiration, this energy can be required n for growth and active transport

Question 11

How does water enter the plant

Answer 11

water in the soil enters the root via root hair cells, water the moves through the cell wall then travels acuoss a partially pacmeable cel membrane into the cytoplasm by osmosis