6. Plant structures and functions.

Question 1

what are the main producers of food and therefore biomass?

Answer 1

photosynthetic organisms

Question 2

in what sort of organisms does photosynthesis occur?

Answer 2

plants and algae

Question 3

what are the reactants in photosynthesis?

Answer 3

carbon dioxide and water

Question 4

what are the products in photosynthesis?

Answer 4

glucose and oxygen

Question 5

what does photosynthesis require?

Answer 5

light energy

Question 6

give the word equation for photosynthesis

Answer 6

carbon dioxide + water—> glucose+ Oxygen

Question 7

give three limiting factors on the rate of photosynthesis

Answer 7

temperature, light, intensity, and carbon dioxide concentration

Question 8

what is the rate of photosynthesis directly proportional to?

Answer 8

light intensity

Question 9

what is the rate of photosynthesis inversely the proportional to?

Answer 9

The distance from LightSource

Question 10

what is the independent variable when investigating the effect of light intensity on the rate of photosynthesis?

Answer 10

distance on the lamp to the pond weed

Question 11

what is a dependent variable, when investigating the effect of light intensity on the rate of photosynthesis

Answer 11

rate of change of pH of the solution

Question 12

what is the function of root hair cells?

Answer 12

to absorb water and mineral ions from the soil

Question 13

how are root hair cells adapted to their function?

Answer 13

they have large surface area

Question 14

what is the function of the xylem?

Answer 14

transporting water and minerals through the plan

Question 15

how are xylem adapted to their function?

Answer 15

they have lignified dead cells. The dead cells have no cytoplasm, so there is no space for water to move through. the wall strengthened with lignin rings, which makes them strong and stop them collapsing.

Question 16

what is the function of a phloem?

Answer 16

transport sucrose around a plant

Question 17

how are phloem adapted to their function?

Answer 17

they have living cells which is energy to transport substances. They contain sieve tube elements and companion cells

Question 18

name the process which water and mineral irons are transported through the plant

Answer 18

transpiration

Question 19

name the process which sucrose is transported around the plant

Answer 19

translocation

Question 20

give three factors that affect the rate of transpiration

Answer 20

light intensity, air movement and temperature

Question 21

how does light intensity, affect transpiration

Answer 21

high light intensity causes, stomata open, rate of evaporation increases, so more water is taken up to replace it

Question 22

how does air movement affect transpiration

Answer 22

more movement means transpiration increases

Question 23

how does temperature affect transpiration?

Answer 23

higher temperatures leads to a faster rate of transpiration

Question 24

what equipment do you need to measure the rate of transpiration?

Answer 24

potometer

Question 25

how can you calculate the rate of transpiration?

Answer 25

Distance moved divided by time taken