6.1 , 6.2 (plant)

Question 1

define photosynthesis

Answer 1

process by which green plants manufacture carbohydrates from carbon dioxide and water
using energy from light captured by chlorophyll

Question 2

photosynthesis chemical equation

Answer 2

6CO2 + 6H2O ——> C6H12O6 + 6O2
carbon dioxide + water —-> glucose + oxygen

Question 3

heterotrophs

Answer 3

do not make their own foods - feed on organic substances
e.g animal and fungi

Question 4

autotrophs

Answer 4

make their own foods- feed on inorganic substance
e.g green plants

Question 5

importance of nitrate ions - making of amino acids

Answer 5

• nitrate ions produce nitrogen which is essential for making amino acids
• amino acids are building blocks of protein
• protein is needed for growth repair and making enzymes
• without enough nitrates, plants cant produce proteins
• leading to stunted growth and yellow leaves

Question 6

importance of magnesium ions contain nitrogen- making of chlorophyll

Answer 6

• Magnesium ions are needed to make chlorophyll, the green pigment in leaves.
• Chlorophyll is essential for photosynthesis, which allows plants to make food.
• Without enough magnesium, plants cannot make enough chlorophyll, causing leaves to turn yellow and reducing the plant’s ability to photosynthesis

Question 7

limiting factors of photosynthesis

Answer 7

1. light intensity
2. temperature
3. chlorophyll
4. supply of raw material

Question 8

waxy cuticle

Answer 8

reduces water loss, preventing cell from drying out

Question 9

upper epidermis

Answer 9

prevent entry of disease causing organism
transparent allowing free passage of light

Question 10

palisade layer

Answer 10

where photosynthesis occurs
absorption of the max amount of light energy

Question 11

spongy layer

Answer 11

aid diffusion of gases through lead, gas exchange occurs

Question 12

stoma

Answer 12

allow carbon dioxide exchange

Question 13

vascular bundle

Answer 13

made up of xylem and phloem

Question 14

lower epidermis

Answer 14

protects cell inside the lear

Question 15

uses of glucose

Answer 15

provides energy
- glucose is transported as sucrose (glucose is too reactive)
- the spare sugar is converted into starch and stored in grains, seeds
- not a good storage molecule because it is soluble in water and reactive

Question 16

limiting factor

Answer 16

a factor that is in short supply, therefore limits how quickly the plant can photosynthesise