Plant Food Stuff

Question 1

Factors affecting photosynthesis

Answer 1

Light Intensity: increasing light intensity increases the rate of photosynthesis
CO2 concentration: The more CO2, the more photosynthesis
Temperature: higher temperature = more photosynthesis

Question 2

Process of photosynthesis and conversion of light energy to chemical energy

Answer 2

Carbon dioxide + water –> glucose + oxygen
6CO2 + 6H2O –> C6H12O6 + 602
Chlorophyll (in chloroplasts) absorb light energy needed for reaction to take place. The products of the reaction contain more energy than the CO2 and H2O, therefore photosynthesis converts light energy to chemical energy.

Question 3

Use of glucose in plants

Answer 3

oxidised in respiration to give energy

Question 4

use of sucrose in plants

Answer 4

main sugar carried in phloem

Question 5

use of starch in plants

Answer 5

glucose converted to starch for storage

Question 6

use of cellulose in plants

Answer 6

to form plant cell walls

Question 7

use of lipids in plants

Answer 7

needed for the membranes of all cells

Question 8

Mineral ions needed for plant growth

Answer 8

magnesium: chlorophyll for photosynthesis
nitrates: for amino acids
Phosphate: making DNA and many other compounds; part of cell membranes.
Potassium: needed for enzymes of respiration and photosynthesis to work.

Question 9

Effects of deficiency of magnesium ions in plants

Answer 9

Leaves turn yellow

Question 10

Effects of deficiency of phosphate ions in plants

Answer 10

Poor root growth; younger leaves turn purple

Question 11

Effects of deficiency of nitrate ions in plants

Answer 11

Stunted growth of plant; older leaves turn yellow

Question 12

Effects of deficiency of potassium ions in plants

Answer 12

Leaves turn yellow with dead spots.