Photosythesis

Question 1

Stoma

Answer 1

Is a tiny opening on the surface of a leaf usually on the under side of the
Function: allows gas’s exchange( carbon in oxygen out (diffusion)
Helps with transpiration (water vapor leaving the leaf

Question 2

How do different color lights effect photosynthesis

Answer 2

Red & blue lights are best for photosynthesis
Green light is mostly reflected so less effective

Question 3

How does high temperature affect co2 concentration

Answer 3

It increases enzyme activity (to a point) so more co2 is used lowering its concentration

Question 4

How does too high of a temperature effect co2 concentration

Answer 4

Enzymes denature photosynthesis slows so co2z concentration increases

Question 5

How does low temperature affect co2 concentration

Answer 5

Slows down enzyme activity so less co2 is used

Question 6

How to test a leaf to show the effect of if light is needed for photosynthesis

Answer 6

1)leave a plant in the dark for 48 hours (destarch it)
2)Corner a part of the leaf with oil
3)Put the plant in sunlight
4)boil the leaf
5)Put it in entonal in hot water bath to remove chlorophyll
6) rinse in warm water to soften
7)ass iodine solution

Question 7

Results of the test if light is needed for photosynthesis

Answer 7

Areas exposed to light will turn black-blue (if starch is present)
Covered areas stay brown/orange (no starch)

Question 8

Photosynthesis equations

Answer 8

Word:
Carbon dioxide + water —> glucose + oxygen
Chemical
6co2 +6H2o —> c6H12O6 + 6o2

Question 9

Leaf adaptations

Answer 9

Waxy cuticle: waterproof layer reduces water loss
Palisade mesophyll cells: packed with chloroplast near the top= max light absorption
Spongy mesophyll cells: loosely packed with air spaces for gas’s exchange
Stoma (stomata): allow co2 in and o2 out
Guard cells: controls opening/closing of stoma

Question 10

How to test for starch in a leaf

Answer 10

1) boil the leaf (kills it)
2) put it in ethanol (removes chlorophyll)
3)rinse in warm water
4) add iodine (if black-blue starch is present photosynthesis happened)

Question 11

How to prove a leaf photosynthesis

Answer 11

Test for starch after exposing the leaf to lighten
Only parts photosynthesis will test positive (blue-black with iodine)

Question 12

Floating plants

Answer 12

They have stoma above the leaf
Why?
Floating leaves lie flat on water
The lower side touches the water- gas can’t enter from there
So stoma on top lets them breath and do photosynthesis

Question 13

What are adaptions of floating plants

Answer 13

Stoma on top
Large flat leaves to float
Waxy coating to repel water
Air spaces in leaves to help with buoyancy

Question 14

Advantages and disadvantages of floating plants adaptions

Answer 14

Adavantage:
Access to sunlight
Direct gas exchange with air
Disadvantage:
Risk of drying out if water level drops
More exposed to herbivores and weather

Question 15

What’s endothermic

Answer 15

A chemical process that requires energy transferred from its surroundings

Question 16

Chloroplast

Answer 16

Subcellular structures in which photosynthesis take place

Question 17

Chlorophyll

Answer 17

Green pigments in chloroplast to which energy is transferred by light

Question 18

Guard cells

Answer 18

Shape to open and close the stoma (pore)

Question 19

Xylem

Answer 19

Transports water and mineral ions from roots to leaf

Question 20

Phloem

Answer 20

Transports sucrose (made from glucose) from source (where it is made) to sink? (Where is stored/needed)

Question 21

Limiting factors

Answer 21

Light intensity and co2
Temperature and enzymes

Question 22

What is glucose used for in plants

Answer 22

Glucose is used in respiration to release energy (ATP)
Uses cellulose to make cell wall
Converted to sucrose to be transported
Converted into starch for energy storage