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Flashcards in topic 6 Deck (39):
1

what is the equation for photosynthesis

carbon dioxide (6C02) + water (H20) = glucose (C6H12O3) +oxygen (02)

2

name 2 photosynthetic organisms

green plants, algae,

3

Photosynthesis uses energy from the sun to make what?

Glucose

4

what happens to the energy stored in a plants biomass?

it is transferred to another organism when the plant is eaten and so on along the food chin meaning photosynthetic organisms give life to most animals.

5

what are chloroplasts?

they are the sight of photosynthesis they contain chlorophyll which absorbs light.

6

how is energy transferred to the chloroplasts?

by light

7

what type of reaction is photosynthesis?

endothermic

8

name the 3 factors that have an effect on the rate of reaction in photosynthesis

light intensity, concentration of CO2, temporature

9

name a plant that can be used to investigate the effect of light intensity on the rate of photosynthesis.

Canadian pondweed

10

what apparatus would you need to conduct the effect of light intensity on the rate of photosynthesis test.

gas syringe tight source, ruler, water and sodium hydrogencarbonate, conical flask and bung

11

at what temperature do the enzymes denature in photosynthesis?

45decreese c

12

what is a root hair cell?

a cell that grows on the surface of a plant

13

what do root hair cells do?

the enlarge the surface area of a plant so it can absorb water and mineral's

14

how do root hair cells abosorb water?

osmosis

15

how do root hair cells absorbe minerals

active transport because the concentration of minerals is higher in the soil than the plant

16

what are phloem tubes used for?

transport food

17

what are phloem tubes made from?

columns of elongated living cells with small pores

18

what is the main food substance moved around by the phloem?

Sucrose

19

what is the process of movement in the phloem called?

translocation it requires energy from resperation

20

what does the xylem do?

takes water and minerals up

21

what is the xylem made from

dead cells

22

what is the xylem strengthend by

by ligin

23

what is transportation caused by

evaporation

24

what are the stomata used for?

gas exchange

25

where are the stomata Found

lower side of the leaf

26

what do stomata let through?

CO2 Oxygen and water vapour

27

what opens and sits the stomata?

gard cells

28

name the 3 factors that effect transportation

light intensity
temporature
air flow

29

how do you estimate transpireatation rate

with a photometer

30

where dose transpireatation take place

in the leaves

31

trainspireation is____________'in a plant

constant

32

the translocation streme carries what?

mineral Ions and water

33

name 6 ways in which the leaf is adapted for photosynthesis and gas exchange

1 broad leaves
2 palisade layer has lots of chloroplasts
3 upper endermis is transparent
4xylem and phloem
5 covers in a waxy cuticle
6 tissues of leaves adapted for gas exchange

34

name 6 ways plants are adapted to extreme environments

small leaves
curled leaves
thick cuticle
thick stem stores water
stomata in sunken pits

35

what are auxins?

plant growth hormones

36

what does positively phototrophic mean?

Graeme towards light ( shoots)

37

what does positively gravitrophic mean

grows with gravity roots

38

how do auxins make a plant grow

towards the light

39

name 6 commercial uses for plant hormones

selective weed killers
growing from cuttings with root power
controling flower and fruit formation
producing seedles fruit
controling ripening
controling germination