Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 29

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Question 1
1 / -0

Basic structure of all chlorophyll comprises of

A
Cytochrome system

B
Flavoproteins

C
Porphyrin system

D
Plastocyanin

Solution

The photosynthesis is carried out using light energy trapped by chlorophylls. The chlorophyll pigments maximally absorb red and blue lights. The basic structure of chlorophyll molecule is porphyrin system. The chlorophyll porphyrin comprises a cyclic tetrapyrrole head to which a long phytol tail is attached. One atom of magnesium is coordinated to the center of tetrapyrrole head.
So, the correct answer is option C.
Question 2
1 / -0

Which colour of light gives maximum absorption peak by chlorophyll a?

A
Blue light

B
Green light

C
Violet light

D
Red light

Solution

Chlorophylls are present in chloroplasts, which absorb light energy. Chlorophyll a is the primary photosynthetic pigment and is found in all the photosynthetic organisms except bacteria. The chlorophyll a absorbs blue, yellow and red wavelengths of the spectrum. It shows maximum absorption of blue light.
So, the correct answer is option A.
Question 3
1 / -0

Who amongst the following, first observed photosynthesis in plants?

A
Melvin Calvin

B
Darwin

C
Arnon

D
R. Hill

Solution

Melvin Calvin first observed photosynthesis in plants. Calvin is remembered above all for his work in photo-synthesis, research that won him the Nobel Prize in Chemistry in 1961.
In 1946 Calvin began his Nobel prize-winning work on photosynthesis. After adding carbon dioxide with trace amounts of radioactive carbon-14 to an illuminated suspension of the single-cell green alga Chlorella pyrenoidosa, he stopped the alga’s growth at different stages and used paper chromatography to isolate and identify the minute quantities of radioactive compounds. This enabled him to identify most of the chemical reactions in the intermediate steps of photosynthesis—the process in which carbon dioxide is converted into carbohydrates. He discovered the “Calvin cycle,” in which the “dark” photosynthetic reactions are impelled by compounds produced in the “light” reactions that occur on absorption of light by chlorophyll to yield oxygen. Also using isotopic tracer techniques, he followed the path of oxygen in photosynthesis. This was the first use of a carbon-14 tracer to explain a chemical pathway.
Question 4
1 / -0

In angiosperms, synthesis of chlorophyll occurs in presence of

A
Phytochrome

B
Light

C
Cytochrome

D
None of the above

Solution

Chlorophyll are light harvesting cyclic tetrapyrrole compounds. The chlorophyll biosynthesis requires iron and magnesium mineral ions. The succinyl CoA, an intermediate of Krebs cycle and the amino acid glycine initiate the biosynthesis of chlorophyll 'A', leading to production of protochlorophyllide or protochlorophyll. The protochlorophyllide or protochlorophyll is converted to chlorophyll 'A' in presence of light.
Question 5
1 / -0

The chemical composition of pigments chlorophyll and carotenoids for the first time was given by

A
Willstatter and Stoll

B
Mayer and Andreson

C
Robert Mayer

D
Senebier

Solution

Richard Martin Willsttter, was a German organic chemist whose study of the structure of plant pigments, chlorophyll included, won him the 1915 Nobel Prize for Chemistry. He studied the structure of alkaloids (colorless, complex, and bitter organic compounds), anthocyanins (red, blue, and violet plant pigments), and chlorophyll (the green, light-absorbing catalyst in plants). He also corrected mistakes in the scientific understanding of cocaine's atomic structure and synthesized that drug, and pioneered the technique of chromatography ("color-writing"), developed independently by Willsttter and his student Arthur Stoll (1887-1971) in the 1920s.
So, the correct answer is option A.
Question 6
1 / -0

In photosystem - I active chlorophyll is

A
P - 600

B
P - 680

C
P - 700

D
P - 720

Solution

The chlorophylls are the pigments, which trap solar energy. The pigments are organised into distinct photosystems. The reaction centre of pigment system I is P-700, whereas reaction centre of pigment system II is P-680.
So, the correct answer is option C.
Question 7
1 / -0

Porphyrin occurs in:

A
Chlorophyll

B
Haemoglobin

C
Cytochrome

D
All of the above

Solution

Porphyrin is a rigid, square-planar molecule made of four pyrroles (a five-membered ring containing a nitrogen atom) connecting to form a larger ring. The molecule is stabilized by the aromatic character, which extends over its entire structure.
A porphyrin has four of its nitrogen atoms facing the center, which can capture a metal ion to form a very stable organometallic complex.
It is present in chlorophyll, haemoglobin and cytochrome. By using them, biological systems carry out a wide range of chemical reactions.
Question 8
1 / -0

Chlorophyll is present

A
In the grana of chloroplasts

B
On the surface of chloroplasts

C
Dispersed through out the chloroplasts

D
In the stroma of chloroplasts

Solution

Chlorophyll is light trapping pigment, which carries light reaction during photosynthesis. The light reaction occurs in the thylakoid which is a coin like structure stacked over each other to form grana of the chloroplast. Dark reaction or synthetic part of photosynthesis occurs in the stroma of the chloroplast
So, the correct answer is 'In the grana of chloroplasts'
Question 9
1 / -0

Universal photosynthetic chlorophyll is

A
Chl - a

B
Chl - b

C
Chl - c

D
Chl - e

Solution

Chlorophylls are major light harvesting pigments of green plants. They are of 8 major types- chlorophyll a, b, c, d, e, bacteriochlorophyll a and b and chlorobium chlorophyll. The chlorophyll a is the major photosynthetic pigment, which is found in all photosynthetic organisms. Hence, it is also called as universal photosynthetic pigment.
Question 10
1 / -0

Chlorophyll pigments are soluble in

A
Water

B
Inorganic solvent

C
Organic solvent

D
Water and organic solvent

Solution

Chlorophylls are green photosynthetic pigments. Chemically, they are porphyrins having a cyclic tetrapyrrole head and a long phytol tail attached to the head. Because the electrons move freely, the ring has the potential to gain or lose electrons easily, and thus the potential to provide energized electrons to other molecules. They are water insoluble and soluble in organic solvents.
So, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 29

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Photosynthesis in Higher Plants Test - 29

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SHARING IS CARING

Question 1

Cytochrome system

Flavoproteins

Porphyrin system

Plastocyanin

Solution

Question 2

Blue light

Green light

Violet light

Red light

Solution

Question 3

Melvin Calvin

Darwin

Arnon

R. Hill

Solution

Question 4

Phytochrome

Light

Cytochrome

None of the above

Solution

Question 5

Willstatter and Stoll

Mayer and Andreson

Robert Mayer

Senebier

Solution

Question 6

P - 600

P - 680

P - 700

P - 720

Solution

Question 7

Chlorophyll

Haemoglobin

Cytochrome

All of the above

Solution

Question 8

In the grana of chloroplasts

On the surface of chloroplasts

Dispersed through out the chloroplasts

In the stroma of chloroplasts

Solution

Question 9

Chl - a

Chl - b

Chl - c

Chl - e

Solution

Question 10

Water

Inorganic solvent

Organic solvent

Water and organic solvent

Solution

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