B4.2

Question 1

what is glucose made up of?

Answer 1

carbon
hydrogen and
oxygen atoms

Question 2

how may glucose be used?

Answer 2

• chemicals for growth of plant cells (cellulose)
• starch for storage
• broken down during respiration

Question 3

cell wall

plant cell

Answer 3

provides support

Question 4

cell membrane

plant cell

Answer 4

allows gases and water to pass in and out of the cell freely whilst presenting a barrier to other chemicals

Question 5

nucleus

plant cell

Answer 5

contains DNA which carries genetic code for making enzymes and other proteins used in photosynthesis

Question 6

vacuole

plant cell

Answer 6

store waste materials

regulate water levels

Question 7

cytoplasm

plant cell

Answer 7

where enzymes and other proteins are made

Question 8

mitochondria

Answer 8

where respiration occurs

Question 9

chloroplasts

plant cell

Answer 9

contain chlorophyll and enzymes for photosynthesis

Question 10

nitrogen (in form of nitrates)

Answer 10

absorbed and used by plant cells to make proteins

Question 11

what do substances do by diffusion?

Answer 11

move through cells

Question 12

what is diffusion

Answer 12

the passive overall movement of molecules from a region of their higher concentration to a region of their lower

Question 13

what are minerals taken up by plant roots used to make?

Answer 13

some chemicals needed by cells

nitrogen from nitrates to make proteins

Question 14

main method by which gases enter and leave the plant

Answer 14

diffusion

Question 15

diffusion- carbon dioxide and oxygen

Answer 15

gases such as carbon dioxide and oxygen exchange between the leaf and its surrounding air through stomata (small holes on the underside of a leaf)

Question 16

what is osmosis

Answer 16

a specific case of diffusion

the overall movement of water from a dilute to a more concentrated solution through a partially permeable membrane

Question 17

what occurs by osmosis?

Answer 17

the movement of water into plant roots

Question 18

active transport

Answer 18

the overall movement of chemicals across a cell membrane requiring energy released by respiration

Question 19

what is active transport used in?

Answer 19

the absorption of nitrates from plant roots

Question 20

limiting rate of photosynthesis

temperature

Answer 20

too low-stops until rises

too high- enzymes stop working permanently

Question 21

limiting rate

carbon dioxide concentration

Answer 21

as it increases so does rate of photosynthesis

Question 22

limiting rate

light intensity

Answer 22

greater availability quicker it will take place

Question 23

light meter

Answer 23

measure amounts of light hitting a leaf

data loggers can be fit with one and readings taken over time

Question 24

light measured in what?

Answer 24

lux

Question 25

quadrat

Answer 25

square shape

placed randomly on sections of area in question and plants that fall in it are counted

Question 26

identification key

Answer 26

rapid identification by asking questions

Question 27

transect

Answer 27

line is drawn and quadrat is placed at set intervals along it and plants are counted
gives a picture of changes in plant life over line of the transect