B8 (Photosynthesis)

Question 1

Photosynthesis equation

Answer 1

Carbon dioxide + water -> (chlorophyll and light) Glucose + oxygen

Question 2

Air spaces (leaf adaptation)

Answer 2

Carbon dioxide reach the cells and oxygen leave through diffusion

Question 3

Stomata opening/closing (leaf adaptation)

Answer 3

More Carbon Dioxide entering, more oxygen leaving (gas exchange)

Question 4

Veins (adaptation)

Answer 4

Bring water to the xylem and removes waste products through the phloem

Question 5

Larger surface area (leaf adaptation)

Answer 5

More light enters the leaf

Question 6

Palisade layer being horizontal (leaf adaptation)

Answer 6

Better flow of carbon dioxide as there are less guard cells

Question 7

Chloroplasts (leaf adaptation)

Answer 7

Contains chlorophyll to absorb the light in the cells

Question 8

Glucose turns into…

Answer 8

Stored as starch and turns unto sugars, proteins, lipids and cellulose

Question 9

Test for starch

Answer 9

Red-brown iodine turns into blue-black

Question 10

Method for RP ‘Rate of Photosynthesis’

Answer 10

1) cut 8-10cm pondweed place it in boiling tube (water and sodium bicarbonate)
2) record temperature
3) place small beaker into the larger beaker
4) wait for a steady flow of bubbles and record how many bubbles in 2 minutes
5) adjust the distance keeping the water temperature the same

Question 11

What is cellulose?

Answer 11

• contains complex carbohydrates from glucose

- strengthens cell walls

Question 12

Why does glucose turn into starch?

Answer 12

• glucose soluble in water effecting osmosis and water balance
• starch is insoluble, has no effect
• lot of starch stored up in the cells

Question 13

Why does Glucose make amino acids?

Answer 13

• built into proteins which can be used for enzymes (eg. Energy for respiration)
• built into lipids for energy to strengthen the cell walls

Question 14

How does light effect the rate of photosynthesis?

Answer 14

• more light, increased rate

- opens stomata allows more carbon dioxide in and more oxygen to leave

Question 15

How does temperature effect the rate of photosynthesis?

Answer 15

• increased temperature, increase rate
• heat acts as a catalysts for all chemical reactions
• enzymes (used for photosynthesis) denature around 40-50 degrees

Question 16

How does Co2 Concentration effect the rate of photosynthesis?

Answer 16

• increase levels, increased rate

- can be limiting factor as in the night plants respire not photosynthesise, in the morning most of it gets used up

Question 17

How does Chlorophyll in the leaf effect the rate of photosynthesis?

Answer 17

• less chlorophyll, slowly the rate of photosynthesis

- in the chloroplasts, which absorb the light

Question 18

Uses of the Garden Greenhouse

Answer 18

• can electronically control the limiting factors for max photosynthesis and growth
• bigger crop intake per week for businesses meaning much more profitable (depending business size)

Question 19

Hydroponics

Answer 19

When plants are grown in water for the exact correct intake or nutrients and minerals from the soil