B8

Question 1

what is the equation for photosynthesis

Answer 1

carbon dioxide+ water ——> glucose+oxygen

Question 2

what is the symbol equation for photosynthesis?

Answer 2

6CO2+6H2O—->C6H12O6+6O2

Question 3

what are leaf adaptations

Answer 3

-broad with big surface area for light to fall

-thin for short diffusion spaces

-chlorophyll in the chloroplasts to absorb light

-they have veins should bring water in the xylem and remove sugars in the phloem

-Air spaces that allow carbon dioxide to get to the cells and oxygen to leave by diffusion

-guard cells the open and close the stomata to regulate gas exchange

Question 4

what is a limiting factor in photosynthesis?

Answer 4

-if one or more of these things (light, temp, co2) is in short supply it limits the amount of photosynthesis a plant carries out

Question 5

what affects the rate of photosynthesis?

Answer 5

-light
-co2 conc.
-temp
-amount of chlorophyll

Question 6

what is inverse square law

Answer 6

-light intensity (fish symbol) 1/distance^2

Question 7

how do plants use glucose?

Answer 7

-cellulose and starch for storage

-proteins for growth and enzymes

-lipids for energy store

Question 8

how do plants use glucose for cellulose and starch?

Answer 8

-cellulose is the buildup of glucose into complex carbohydrates

-glucose is soluble in water so would affect the way water moves in and out of the cell by osmosis. so instead is stored as starch.

-starch is an energy store when it gets dark
-starch is also the main energy store of the plant

Question 9

how to plant use glucose for proteins for growth and enzymes

Answer 9

-they combine sugars with nitrate ions to form amino acids for protein synthesis

-it then uses the amino asses to build proteins which make new enzymes and build tissue

Question 10

how to plant use glucose
to make lipids for energy store

Answer 10

-they store energy in their seeds which provides food for new plant to raspire as it germinates

Question 11

is photosynthesis an exothermic reaction or an endothermic reaction?

Answer 11

endothermic

Question 12

what are the layers of the leaf

Answer 12

-waxy cuticle-waterproof to stop water loss from top of leaf

-upper epidermis-transparent to let light through

-Palaside mesophyll -most photosynthesis takes place here

-spongy mesophyll-gaps for gas exchange

-vascular bundle -xylem and phloem

-lower epidermis-bottom of leaf with holes in it (stomata gassed enter and leave including water)

-guard cells -change size to control rate of gases exiting through stomata