photosynthesis

Question 1

What type of reaction is photosynthesis

Answer 1

Endothermic reaction
Takes in energy

Question 2

increase in light intensity =

Answer 2

increase in photosynthesis until another factor becomes limiting

Question 3

increase in temp =

Answer 3

increase rate of photosynthesis until enzymes become denatured because of heat if too cold enzymes work slower

Question 4

how do distance and light intensity link

Answer 4

inversely proportional
increase in distance = decrease in light intensity

Question 5

Equation of photosynthesis

Answer 5

6co2+6H2o = C6H12o6 + 6o2
carbon dioxide+ water = glucose+ oxygen

Question 6

What occurs through the xylem

Answer 6

Transpiration occurs due to a loss of water from of evaporation in the leaves so water is drawn from the root to the leaves causing a transpiration stream

Question 7

Structure of xylem and what does it carry

Answer 7

Made of dead cells and is hollow. Can be strengthened by lignin.Carry water+ dissolved minerals

Question 8

What occurs through the phloem

Answer 8

Translocation; food substances such as glucose= transported from leave to rest of plant

Question 9

structure of phloem

Answer 9

Made of elongated living cells+ pores at the end of walls to allows transportation of substances

Question 10

Diffusion

Answer 10

move down conc gradient
high ➡️ low conc

Question 11

Osmosis

Answer 11

down conc gradient
high➡️ low

Question 12

adaptation + function of root hair cell

Answer 12

large SA = ⬆️ water absorption
Thin cell walls = so flow of water doesn’t slow down

Question 13

why do guard cells become turgid? 

Answer 13

opens stomata, so water comes in 

Question 14

why do guard cells become flaccid?

Answer 14

Close stomata so water moves out

Question 15

function of stomata 

Answer 15

allows gaseous exchange 

Question 16

where are auxin found?

Answer 16

in the meristem cell in the shoot tip

Question 17

what does the auxin do in shoots?

Answer 17

causes elongation in the shoot. Goes to side with more shade forcing it to bend towards the light

Question 18

what tropism occurs when auxin is in shoots

Answer 18

positive phototropism 

Question 19

what happens when there is auxin in roots 

Answer 19

inhibits growth forces roots to bend downward further into ground

Question 20

Function of gibberellin

Answer 20

(hormone)
stimulates, germination and flowering 

Question 21

ethene

Answer 21

ripen plants and fruit so they are in optimal condition to be sold 

Question 22

Waxy cuticle

Answer 22

⬇️ water loss

Question 23

upper epidermis

Answer 23

transparent so light passes to Palisade mesophyll layer

Question 24

Palisade mesophyll

Answer 24

contains lots of chloroplast 

Question 25

Spongy mesophyll

Answer 25

many airspaces, which increases rate of diffusion in and out of cell 

Question 26

lower epidermis

Answer 26

Lots of stomata, so carbon dioxide diffuses directly to leaves

Question 27

Leaves

Answer 27

tend to be broad, larger surface area, increasing exposure of light 

Question 28

Spine and small leaves

Answer 28

Decreases surface area so less water loss. Spines stopped animals from eating plants.

Question 29

hair/curled leaves ( cold environment)

Answer 29

Traps water vapour