Photsynthesis respiration Etc

Question 1

Equation for photosynthesis

Answer 1

Carbon Dioxide +Water = sugars + oxygen

In presence of chlorophyll and light

Question 2

Factors that effect rate of photosynthesis

Answer 2

Light intensity
Temperature - optimum 25-30 minimum 5
Water availability - drought flood etc stomata close and inhibit
Nutrient availability - iron and magnesium produce chlorophyll
Carbon dioxide levels -

Question 3

Importance of photosynthesis

Answer 3

Process basis of all living things - capturing energy from the sun and using for all living beings
All life depends on process
Absorbing co2 and releasing o2 balances respiration

Question 4

What is the law of limiting factors

Answer 4

The factor in least supply will limit the rate of photosynthesis.
Even if increase other factors won’t make any difference

Question 5

Aerobic respiration equation

Answer 5

Oxygen + glucose (or carbohydrate) = carbon dioxide, water and energy

Question 6

Where does aerobic respiration take place

Answer 6

Mitochondria

Question 7

Anaerobic respiration equation

Answer 7

Carbohydrate /glucose = ethanol/alcohol, carbon dioxide + low energy
Ethanol is toxic

Question 8

Factors affecting rate of respiration

Answer 8

Oxygen levels

Temperature

Question 9

Diffusion

Answer 9

Liquid or gas movement from area of high concentrations to low concentrations.

Question 10

Osmosis definition

Answer 10

Movement of water from high to low concentrations across a semi permeable membrane

Question 11

How does water get taken up from soil

Answer 11

Osmosis through root hairs

Question 12

How does water move in the root

Answer 12

Moves across root towards transporting tissue in centre by moving unrestricted through cell walls and intercellular spaces.
Some osmosis too.
When it meets endodermis with casparian strip water is prevented from moving freely and has to cross the membrane which acts as a control point for mineral uptake.
Moves across endodermis, and pericycle and into xylem

Question 13

How does water move up the stem of a plant

Answer 13

Xylem tissue

Transpirational pull.

Question 14

Movement of water in the leaf

Answer 14

Out of xylem and between leaf cells
Also osmosis as in root
Evaporates from cell surfaces and into air spaces
Water vapour diffuses out of stomata because surrounding air has lower humidity level
Transpiration

Question 15

Transpiration

Answer 15

Evaporation of water vapour from the leaves and other surfaces

Question 16

How is the leaf designed for maximum transpiration and minimum transpiration

Answer 16

Lamina and petiole positioned to absorb maximum light.
Epidermis - waxy layer to reduce water loss
Cells containing most chloroplasts are located just below the epidermis
Stomata mostly on underside of leaf - don’t get blocked
Leaf shaped for run off of water
Guard cells

Question 17

Name of cells where photosynthesis takes place

Answer 17

Pallisade mesophyll