2.7 Photosynthesis

Question 1

The basic source of energy that sustains life begins with _

Answer 1

sunlight

Question 2

Sunlight is absorbed by a green pigment known as _.

Answer 2

chlorophyll

Question 3

The _ layer of the leaf contains the largest number of chloroplasts and is in the best position to trap the maximum amount of solar energy.

Answer 3

mesophyll

Question 4

Accordingly, there are two distinct parts in chloroplasts: _ and _.

Answer 4

Granum and Stroma

Question 5

_ consists of stacks of flattened sacks, each of which is called thylakoid.

Answer 5

Granum

Question 6

_ contains the chlorophyll, enzymes and cofactors that participate in the light trapping phase of photosynthesis

Answer 6

Granum

Question 7

The light reaction takes place in _.

Answer 7

granum

Question 8

_ is a gel-like colorless matrix, which is a site for sugar (carbohydrate) synthesis through carbon fixation.

Answer 8

Stroma

Question 9

It is from the sugar produced in the _ that is directly or indirectly converted to all organic compounds (including amino acids, proteins and lipids) virtually found in all organisms

Answer 9

stroma

Question 10

The chloroplast contains _ and other light absorbing accessory pigments capable of absorbing light at different wavelengths.

Answer 10

chlorophyll

Question 11

The light absorbing pigments of chloroplasts absorb most of the visible light, ranging from _ to_ nm.

Answer 11

400 – 700

Question 12

Maximum light absorption of blue light occurs at wavelengths from _ to _ nm.

Answer 12

400 – 500

Question 13

Maximum light absorption of red light occurs at wavelengths from _ to _ nm.

Answer 13

600 – 700

Question 14

Light ranging from 500 to 600nm that includes _ is not absorbed, it is rather reflected.

Answer 14

green light

Question 15

_ this is also known as the light dependent stage.

Answer 15

Light reaction

Question 16

_ takes place in the granum, where the light absorbing system – mainly chlorophyll occurs.

Answer 16

Light reaction

Question 17

In light reaction, the _ is organized as Photosystems and Electron Transporting System.

Answer 17

granum

Question 18

The photosystem of light reaction consists of chlorophyll that absorbs sunlight maximally at _ and _ range of light spectrum.

Answer 18

blue and red

Question 19

The light absorbed by the chlorophyll will split of_ molecules.

Answer 19

water

Question 20

_ is the split of water molecules into H+ and O2.

Answer 20

Photolysis

Question 21

The _ is released to the atmosphere through leaf stomata

Answer 21

O2

Question 22

The light absorbed by the chlorophyll will excite some electrons in the chlorophyll molecule to _ energy level which pass down the ETS (Electron Transporting System) and generate high energy _ molecule.

Answer 22

higher, ATP

Question 23

The ATP and H+ harvested during light reaction will be used as an input in the stroma where conversion of _ to _ takes place.

Answer 23

CO2, carbohydrate

Question 24

_ is also known as light – independent stage

Answer 24

Dark reaction

Question 25

_ can occur in the absence of light as long as there is sufficient amount of H+ and ATP supplied from the light reaction.

Answer 25

Dark reaction

Question 26

The dark reaction and enzymatic reaction H+ indirectly combines with _, in the stroma of chloroplast.

Answer 26

CO2

Question 27

The process by which the dark reaction and enzymatic reaction H+ indirectly combines
with CO2, in the stroma of chloroplast is known as _.

Answer 27

carbon fixation

Question 28

_ is the immediate result of the dark reaction.

Answer 28

Glucose (carbohydrate)

Question 29

The overall chemical reaction of photosynthesis can be summed up in the following equation:

Answer 29

6CO2 + 6H20 Chlorophyll (Sunlight)———————–> C6H12O6 + 6O2

Question 30

A simple way of demonstrating _ in leaves is testing a leaf for starch.

Answer 30

food synthesis

Question 31

You can easily see the effect of iodine on starch, if you put iodine solution on powdered starch, piece of bread or potato slice, a _ color will develop confirming the presence of starch.

Answer 31

blue-black

Question 32

The _ of the leaf is impermeable to iodine.

Answer 32

cuticle

Question 33

The leaf has green pigment _ that interferes with the coloring effect of iodine.

Answer 33

chlorophyll