b1.4 photosynthesis

Question 1

what is photosynthesis?

Answer 1

the process by which green plants and certain other organisms transform light energy into chemical energy

Question 2

what is the equation for photosynthesis?

Answer 2

carbon dioxide + water—-> glucose + oxygen

Question 3

what is the chemical equation for photosynthesis?

Answer 3

6co2+6h2o—->c6h12o6+602

Question 4

how many stages does photosynthesis occur in?

Answer 4

two

Question 5

what are the stages photosynthesis occur in?

Answer 5

the first stage depends on light and the second stage does not depend on light

Question 6

how does water enter a plant?

Answer 6

the roots of a plant have cells called root hair cells which have a big surface area and walls which allow water to pass through easily as well as osmosis

Question 7

how does water get to the leaves?

Answer 7

it is absorbed through the roots and transported through tubes to the leaf and water travels up the xylem vessels

Question 8

how does carbon dioxide enter a plant?

Answer 8

diffuses through small holes called the stomata

Question 9

where does photosynthesis occur?

Answer 9

in the chloroplast of a cell

Question 10

what specialised cells are in the leaves where photosynthesis occurs?

Answer 10

palisade cells

Question 11

what gas leaves a cell?

Answer 11

oxygen

Question 12

what else must travel around the plant?

Answer 12

glucose

Question 13

how does glucose travel around the plant?

Answer 13

through the phloem vessels

Question 14

TRUE OR FALSE:
plants do not eat

Answer 14

true

Question 15

TRUE OR FALSE:
plants do not need food

Answer 15

false

Question 16

TRUE OR FALSE:
plants make their own food from sunlight

Answer 16

true

Question 17

TRUE OR FALSE:
a plants roots absorbs food from the soil

Answer 17

false

Question 18

TRUE OR FALSE:
plants make their own food by a process called photosynthesis

Answer 18

true

Question 19

TRUE OR FALSE:
a plants roots absorb water and minerals from the soil

Answer 19

true

Question 20

TRUE OR FALSE:
photosynthesis is breathing backwards

Answer 20

true

Question 21

TRUE OR FALSE:
plants need carbon dioxide from the air to make their own food

Answer 21

true

Question 22

TRUE OR FALSE:
a plant makes it own food from water and carbon dioxide

Answer 22

true

Question 23

only the green parts of plants can photosynthesise

Answer 23

true

Question 24

what does photosynthesis need?

Answer 24

carbon dioxide
water
sunlight
nutrients
chlorophyll

Question 25

what does photosynthesis produce?

Answer 25

glucose oxygen

Question 26

what is photosynthesis essential for?

Answer 26

growth

Question 27

what complete things can plants make?

Answer 27

sugar starch fat protein

Question 28

when plants are in sunlight what sugar do they make?

Answer 28

glucose

Question 29

what chemical does sunlight get trapped in?

Answer 29

chlorophyll

Question 30

how do we test for chlorophyll?

Answer 30

variegated leaves have pale parts which do not contain chlorophyll the green parts of the leaf contain chlorophyll and are the control add iodine to leaves

Question 31

how do we test for carbon dioxide?

Answer 31

place a destarched plant into a polythene bag place a pot of soda lime (absorbs carbon and water vapour)in the bag seal it place the bag and plant in sunshine and see if it produces starch

Question 32

how do we test for oxygen?

Answer 32

place an aquatic plant in a beaker place an upturned test tube over it place a growling splint inside the test tube and see if it relights

Question 33

how do we test for light?

Answer 33

take a destarched plant cover part of the leaves with black cards or tin foil and place in sunlight for several hours remove the card and test for starch

Question 34

what are limiting factors of that limit the rate of photosynthesis?

Answer 34

light intensity availability of carbon dioxide temperature availability of water