Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Who is credited with identifying petro-crops

A
Swaminathan

B
Calvin

C
Krebs

D
Borlang

Solution

Euphorbiaceae family consists of petroplants. Dr. M. Calvin (1979) was the first to collect the hydrocarbons from the plants of Euphorbiaceae and to innovate a renewable substitute for the petroleum sources.
So the correct option is B.
Question 2
1 / -0

ATP stands for

A
Adenosine triphosphate

B
Adenine diphosphate

C
Adenosine tetraphosphate

D
Adenine triphosphate

Solution

ATP stands for adenosine triphosphate. It is formed as a result of phosphorylation of ADP and Pi. It is called as energy currency of cell. It is a high energy compound, present in cell used for various cellular activities.
Question 3
1 / -0

Respiration initiated in chloroplast and occurs in light is called as

A
Aerobic respiration

B
Anaerobic respiration

C
Photorespiration

D
Fermentation

Solution

Photorespiration is a process in plant metabolism, which attempts to reduce the consequences of a wasteful oxygenation reaction by the enzyme RuBisCO. Photorespiration involves a complex network of enzyme reactions, that exchange metabolites between chloroplasts, leaf peroxisomes and mitochondria. It occurs in presence of light. So, it is called as photorespiration.
Question 4
1 / -0

Chemiosmotic mechanism of ATP synthesis was proposed by

A
Warburg

B
Dickens

C
Krebs

D
P. Mitchell
Solution
- Chemiosmosis is the movement of ions across a selectively permeable membrane, down their electrochemical gradient.
- More specifically, it relates to the generation of ATP by the movement of hydrogen ions across a membrane during cellular respiration or photosynthesis.
- Peter D. Mitchell proposed the chemiosmotic hypothesis in 1961.
- The theory suggests essentially that most ATP synthesis in respiring cells comes from the electrochemical gradient across the inner membranes of mitochondria by using the energy of $$NADH_2$$ and $$FADH_2$$ formed from the breaking down of energy-rich molecules such as glucose.
- So, the correct answer is option D.
Question 5
1 / -0

$$C_{2}$$ cycle is studied in

A
$$C_{4}$$ plants

B
Those showing photorespiration

C
Both A and B

D
None of the above

Solution

Otto Warburg discovered that $$O_2$$ inhibits photosynthesis in C3 plants. This phenomenon originally was known as the Warburg effect, but later it was recognized as the light-dependent release of $$CO_2$$ due to oxygenase activity of RuBisCO which is a bifunctional enzyme because it can catalyze both the carboxylation and the oxygenation of RuBP. When there is low $$CO_2$$ concentration, RuBisCO performs oxygenase activity. Oxygenation of RuBP produces one molecule of 3-phosphoglycerate and one of 2-phosphoglycolate.
2-phosphoglycolate produced by RuBisCO when it oxygenates RuBP can't be utilized within the Calvin cycle. The pathway by which 2-phosphoglycolate is further metabolized is called as glycolate pathway or C2 cycle or oxidative photosynthetic carbon cycle or simply photorespiration. This pathway involves three subcellular compartments, the chloroplasts, peroxisomes and mitochondria.
So, the correct answer is B.
Question 6
1 / -0

Oxidative phosphorylation refers to

A
Anaerobic production of ATP

B
The citric acid cycle production of ATP

C
Production of ATP by chemiosmosis

D
Alcoholic fermentation
Question 7
1 / -0

Which of the following is non-enzymatic phosphorylation

A
Formation of fructose 1,6-diphosphate

B
Formation of dihydroxyacetone phosphate

C
Formation of 1,3-diphosphoglyceraldehyde

D
All the above
Question 8
1 / -0

The major events during photosynthesis are

A
Reduction of CO$$_2$$ to carbohydrates

B
Hydrolysis and production of oxygen as a byproduct

C
Conversion of light energy to chemical energy

D
All of the above

Solution

The major events during photosynthesis is
(a) Absorption of light energy by chlorophyll.
(b) Conversion of light energy to chemical energy.
(c) Splitting of $$H_{2}O$$ into $$H_{2}$$ , $$O_{2}$$ and $$e^{-}$$.
(d) Reduction of $$CO_{2}$$ to carbohydrates.
So, the correct answer is option D.
Question 9
1 / -0

Which of the following are included in the mechanism of photosynthesis?

A
Absorption of light energy by chlorophyll

B
Conversion of light energy into chemical energy

C
Reduction of CO$$_{2}$$ into carbohydrates

D
All of the above

Solution

Photosynthesis is carried out by green plants to synthesize organic compounds. During photosynthesis light energy in sunlight is converted into chemical energy present in bonds of organic compounds and oxygen is released as a by-product. Thus basically it is an energy conversion process.
Chlorophyll traps the light and gets excited to higher energy levels. Reduction of carbon dioxide takes place during the Calvin cycle.
So, the correct answer is option D.
Question 10
1 / -0

How many organisms in the list given below are autotrophs?

Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Wolfia

A
Five

B
Six

C
Three

D
Four
Solution
Autotrophs can manufacture their own food by photosynthesis or by chemosynthesis.
Thus, they may be classified into two major groups:
(1) photoautotrophs and (2) chemoautotrophs
Nostoc, Chara, Porphyra, and Wolffia are photosynthetic autotrophs.
Nitrosomonas and Nitrobacter are chemosynthetic autotrophs.
Trypanosoma is a parasitic organism.
Lactobacillus, Saccharomyces, and Streptomyces are heterotrophs.
So, the correct answer is 'Six'.

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Photosynthesis in Higher Plants Test - 22

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Photosynthesis in Higher Plants Test - 22

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SHARING IS CARING

Question 1

Swaminathan

Calvin

Krebs

Borlang

Solution

Question 2

Adenosine triphosphate

Adenine diphosphate

Adenosine tetraphosphate

Adenine triphosphate

Solution

Question 3

Aerobic respiration

Anaerobic respiration

Photorespiration

Fermentation

Solution

Question 4

Warburg

Dickens

Krebs

P. Mitchell

Solution

Question 5

$$C_{4}$$ plants

Those showing photorespiration

Both A and B

None of the above

Solution

Question 6

Anaerobic production of ATP

The citric acid cycle production of ATP

Production of ATP by chemiosmosis

Alcoholic fermentation

Question 7

Formation of fructose 1,6-diphosphate

Formation of dihydroxyacetone phosphate

Formation of 1,3-diphosphoglyceraldehyde

All the above

Question 8

Reduction of CO$$_2$$ to carbohydrates

Hydrolysis and production of oxygen as a byproduct

Conversion of light energy to chemical energy

All of the above

Solution

Question 9

Absorption of light energy by chlorophyll

Conversion of light energy into chemical energy

Reduction of CO$$_{2}$$ into carbohydrates

All of the above

Solution

Question 10

Five

Six

Three

Four

Solution

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