Lesson 2

Question 1

in plants and a few bacteria is responsible for feeding nearly all life on Earth. the basis of life on earth because it is the primary source of all food on earth and it is
responsible for release of O2 in the atmosphere.

Answer 1

Photosynthesis

Question 2

in 1770, on the basis of his experiments showed the essential role of air in growth of
green plants. A mouse kept in closed space could get suffocated and die but if a mint plant is kept in bell
jar neither candle will extinguish nor will the mouse die. He concluded that foul air produced by animal
is converted into pure air by plants.

Answer 2

Joseph Priestley

Question 3

in 1854 shows that green part in plants produces glucose which is stored as starch.
Starch is the first visible product of photosynthesis.

Answer 3

Julius Von Sachs

Question 4

(1843-1909) used prism to split light into its components and then illuminated
Cladophora (an algae) placed in a suspension of aerobic bacteria. He found that bacteria accumulated ir
blue and red light of the split spectrum. He thus discovered the effect of different wavelength of light o
photosynthesis (action spectrum).

Answer 4

T.W Engelmann

Question 5

(1897-1985) on the basis of studies with purple and green sulphur bacteria showe
that photosynthesis is a light dependent reaction in which hydrogen from an oxidisable compour
reduces CO2 to form sugar.

Answer 5

Cornelius Van Neil

Question 6

are green plastids which function as the
site of photosynthesis in eukaryotic
photoautotrophs.

Answer 6

Chloroplast

Question 7

The reaction in which light energy is absorbed by grana to synthesis ATP and NADPH is called

Answer 7

light reaction

Question 8

The later part of photosynthesis in which CO2 is reduced to sugar, light is not necessary and is
called

Answer 8

dark reaction

Question 9

absorb light and transfer energy to chlorophyll a and protect them from photo-oxidation

Answer 9

accessary pigments

Question 10

enzyme is located in the stroma side of membrane.

Answer 10

NADP reductase

Question 11

are necessary for reduction of NAD+ to NADP + H+.

Answer 11

protons

Question 12

The product of light reaction used to drive the process leading to synthesis of sugar are
called

Answer 12

biosynthetic phase

Question 13

it is a the light dependent process of oxygenation of RUBP and release of carbon dioxide by photosynthetic
organs of plants.

Answer 13

photorespiration

Question 14

as light intensity increases, the rate of photosynthesis also increases until light saturation point.

Answer 14

light

Question 15

with increase in concentration of CO2 rate of photosynthesis increase till the
compensation point.

Answer 15

carbon dioxide concentration

Question 16

it does not influence the rate of photosynthesis directly but at higher temperature enzyme
activity is inhibited due to denaturation of enzymes which affect the dark reaction.

Answer 16

temperature

Question 17

due to increase in amount of water, rate of photosynthesis does not increase proportionally as after
saturation no more water is required during photosynthesis.

Answer 17

water

Question 18

If a chemical process is affected by more than one facior, then is rate will be determined by the factor which
is nearest to its minimal value: it is the factor which directly affects the process if ins quantity is changed.

Answer 18

Blackman’s Law of Limiting power