Q: "The amount of CO2 absorbed and O2 released during photosynthesis are in equal volumes" was proved by:

Bousingault (1860) reported that amount of O2 evolved in photosynthesis is equal to amount of CO2 absorbed and both these processes occur simultaneously as soon as light is given.

Question 1

The law of limiting factor for photosynthesis was enunciated by:

Accepted Answer

Blackman propounded the law of limiting factors. He also proposed the occurrence of a dark phase in photosynthesis.

Question 2

Who proposed the CAM pathway of CO2​ fixation?

Accepted Answer

Correct answer is B

Question 3

Two pigment system theory of photosynthesis was proposed by or Concept of evidence for existence of two photosystems in photosynthesis was given by:

Accepted Answer

The discovery of Emerson effect. One group of pigments absorbs light of both shorter and longer wavelengths (more than 680 nm) and another group of pigment absorbs light of only shorter wavelengths (less than 680 nm ). These two groups of pigments are known as pigment systems or photosystems.

Question 4

Who received the Nobel Prize for working out the early carbon pathway of photosynthesis?

Accepted Answer

Malvin Calvin (1954) traced the pathway of carbon in photosynthesis and gave the C3​ cycle, (now known after him as calvin cycle). He was awarded Nobel prize for this work in 1960 .

Question 5

Which of the following technique was used by Calvin in determining carbon pathway?

Accepted Answer

Malvin calvin and his coworkers in 1954 by using the methods of radio active tracer technique, chromatography and Autoradiography.

Question 6

The process of photophosphorylation was discovered by:

Accepted Answer

Arnon etal. (1954) first of all demonstrated that isolated chloroplasts can produce ATP from ADP+ip and they called this ATP production as photophosphorylation.

Question 7

Most of the plants contain a green colouring pigment which is responsible for photosynthesis. This pigment was named chlorophyll by:

Accepted Answer

Pelletier and Caventou (1818) discovered chlorophyll. It could be separated from leaf by boiling in alcohol.

Question 8

Photosynthesis is the conversion of light energy within a plant' was first stated by:

Accepted Answer

Robert Mayer (1845) proposed that light has radiant energy and this radiant energy is converted into chemical energy by plants, which serves to maintain life of the plants and also animals.

Question 9

Thylakoid' name was given by:

Accepted Answer

Thylakoids (Menke, 1961) or baggy trousers are structural elements of chloroplast.

Question 10

The significance of light and chlorophyll in photosynthesis was discovered by:

Accepted Answer

According to Jan Ingen-Housz (1779), both green parts and sunlight are required for air purification and plant nourishment.

Question 11

"The amount of CO2​ absorbed and O2​ released during photosynthesis are in equal volumes" was proved by:

Accepted Answer

Bousingault (1860) reported that amount of O2​ evolved in photosynthesis is equal to amount of CO2​ absorbed and both these processes occur simultaneously as soon as light is given.

Question 12

The first important biological investigation which led to the conclusion that plant makes its substance from water and not from soil was carried out by:

Accepted Answer

Helmont concluded that "all food of the plant is derived from rain water and not from soil and all parts of the plant develop from water".

Question 13

What plant is used in an experiment commonly performed in laboratory in demonstrate evolution of oxygen in photosynthesis?

Accepted Answer

Correct answer is B

Question 14

Engelmann's experiment with Spirogyra demonstrated that:

Accepted Answer

Both blue and red wavelength are affective because the amount of oxygen released was found to be maximum in blue and red absorption bands of the chlorophyll.

Question 15

Two plants A and B are supplied with CO2​ with H2​O18 and CO218​ with H2​O respectively which of the following plant releases O18 type oxygen in photosynthesis?

Accepted Answer

During photosynthesis O2​ evolved by the hydrolysis of water. If H2​O18 is used in ' A ' plant then it become true that O18 type oxygen evolved from ' A ' plant during photosynthesis.

Question 16

Which of the following isotope of carbon was used by Calvin to trace the path of carbon in photosynthesis?

Accepted Answer

C14 isotope used for knowing carbon path and O18 used for verified that source of O2​ in photosynthesis is H2​O, not CO2​.

Question 17

The given diagram represents an experiment with isolated chloroplasts. The chloroplasts were first made acidic by soaking them in a solution at mathrmpH4. After the thylakoid space reached mathrmpH4 , the chloroplast were transferred to a basic solution at mathrmpH8. The chloroplasts are then placed in the dark. Which of these compounds would you expect to be produced?

Accepted Answer

Correct answer is D

Question 18

Path of carbon in photosynthesis was found by using:

Accepted Answer

Ruben and Kamen used C14 radioactive isotopes in chlorella for knowing path of carbon in photosynthesis.

Question 19

Persons who received Nobel Prizes for their work with green plants are:

Accepted Answer

Correct answer is B

Question 20

Which of the following with respect to early experiments of photosynthesis is wrongly matched?

Accepted Answer

Correct answer is D

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Solutions for Photosysnthesis in Higher Plants Important Questions

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