photosynthesis

Question 1

chemical equation for photosynthesis

Answer 1

6CO2 + 6H2O -> C6H12O6 + 6O2

Question 2

proteins contain which elements

Answer 2

carbon, hydrogen, oxygen, nitrogen

Question 3

glucose, starch and lipids contain which element

Answer 3

carbon, hydrogen, oxygen

Question 4

how to test leaves for starch

Answer 4

boil the leaf to break down cell wall and stop the action of enzymes. then put it in a warm ethanol to extract chlorophyll. then dip the leaf into warm water to allow penetration. then do iodine test.

Question 5

requirement for photosynthesis

Answer 5

light, presence of chloroplast, supply of CO2 and water, suitable temperature of enzymes

Question 6

what is waxy cuticle for

Answer 6

reduce water loss

Question 7

feature of leaf structure for photosynthesis

Answer 7

upper epidermis- transparent to allow light to enter, but prevent pathogen to enter
palisade mesophyll - contain chloroplast, and the cells are densely packed to maximum the absorption of the light
spongy mesophyll- loosely packed to help diffusion of gas
stomata - allow carbon dioxide and oxygen to enter; placed in the lower epidermis to reduce water lose due to sun.

Question 8

when is the guard cell closed ( flaccid)

Answer 8

in the night or whenever the plant has small amount of water.

Question 9

what is limiting factor

Answer 9

the factor which controls the rate of overall process because it is nearest to its minimum value

Question 10

what element does NPK fertiliser provide

Answer 10

nitrogen, phosphorus, potassium

Question 11

deficiencies of ions in plant

Answer 11

Magnesium - leaves turn yellow. it is used for making chlorophyll

nitrogen - stunted, weak stem, yellow leaves. it is required for many food molecules (protein)

Question 12

what is the purpose of hydrogencarbonate indicator

Answer 12

to know the concentration of carbon dioxide

pH rises- purple ( less acidic)
normal - pink
pH falls- orange-yellow ( more acidic)