Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 82

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Question 1
1 / -0

In Red $$\left({P}_{r}\right)$$ and Far-red $$\left({P}_{fr}\right)$$ (given alternately) responses of plants, it is the

A
First treatment that is effective

B
Middle treatment that is effective

C
Last treatment that is important

D
Sum total of all treatments that counts

Solution

Phytochromes are pigments present in plants that plays important role in various biological responses of plants like flowering. It is present in two forms, P$$_r$$, inactive form and P$$_{fr}$$, active form. When P$$_r$$ is exposed to red light, it is converted to active form P$$_{fr}$$. This active form then responses to various biological processes. When P$$_{fr}$$ is exposed to far-red light, it is converted to P$$_r$$. After the exposure to red light if it is immediately exposed to far-red light, the active form P$$_{fr}$$ is converted back to P$$_r$$ and plant will not flower. Similarly, after the exposure of far-red light if it is immediately exposed to red light, the plants will flower as P$$_r$$ is again converted back to P$$_{fr}$$. Hence, the last treatment which is given that is important.
Thus, the correct answer is option C.
Question 2
1 / -0

How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to $$CO_{2}$$ and $$H_{2}O$$ yields $$686$$ kcal and useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?

A
Fifty-seven

B
One

C
Two

D
Thirty

Solution
Question 3
1 / -0

Choose the correct answer from the alternatives given.
$$Mg^{++}$$ and $$Fe^{++}$$ are needed by plants for:

A
stomatal movement

B
energy transfer

C
chlorophyll synthesis

D
carbohydrate translocation

Solution

Usually, Fe and Mg are part of the chlorophyll of the plants, especially porphyrin rings( five carbon rings) in a chlorophyll structure where Mg occupies the central position.
So the correct answer is "chlorophyll synthesis".
Question 4
1 / -0

In the given figure, what are the substances labelled as $$P, Q, R$$ and $$S$$?

A
P-PGA, Q-Glyoxylate, $$R-NH_{3}$$, S-Serine

B
P-Glycolate, Q-Glyoxylate, $$R - NH_{3}$$, S-Serine

C
P-Glycolate, Q-Glyoxylate, $$R - CO_{2}$$, S-Serine

D
P-RuBP, Q-Glycerate, $$R-CO_{2}$$, S-Serine

Solution

The given diagram represents $$C_2$$ cycle or photorespiration. The process has following steps:
•Oxygen binds with RuBP oxygenase and forms phosphoglycolate in chloroplast which gets converted to glycolate and is transported to peroxisomes.
•In peroxisomes it forms glyoxylate and then glycine.
•Glycine then enters the mitochondria and looses $$NH_4$$ and $$CO_2$$ and forms serine.
•Serine is transported to peroxisomes and in a series of reactions it forms glycerate which gets converted to PGA or Phosphoglyceric Acid and then RuBP in the chloroplast.
So, the correct answer is B.
Question 5
1 / -0

Read the following statements and find out the incorrect statement.

A
Glucose is prepared at the source by photosynthesis which is converted to sucrose.

B
Loading at the source produces a hypotonic condition in phloem.

C
Loading of the phloem sets up a water potential gradient that facilitates the mass movement in the water.

D
Phloem tissue is composed of sieve tube cells, which form long columns with holes in their end walls called sieve plates.
Solution
- The glucose is prepared at the source by photosynthesis which is converted to sucrose. The sugar is then moved in the form of sucrose into the companion cells and then into living phloem sieve tube cells by active transport.
- The process of loading at the source produces a hypertonic condition in the phloem.
- So, the correct answer is option B.
Question 6
1 / -0

Which one of the following statements regarding photosynthesis is not correct?

A
Compounds with large positive redox potential tend to denote electrons

B
Chlorophyll a and chlorophyll b have phytol tails which are hydrophobic

C
Cyclic electron transport permits the production of extra ATP without the synthesis of NADPH or the production of free oxygen

D
Crassulacean acid metabolism is present in the plants of Cucurbitaceac and Labiatae
Question 7
1 / -0

Euglenoids having chlorophyll are.

A
Facultative autotroph

B
Facultative heterotroph

C
Obligate heterotroph

D
Obligate autotroph
Question 8
1 / -0

Irradiation of a mixture of $$NH_3, CH_4, H_2$$ and $$H_2O$$ vapour resulted in the formation of adenine. Such experimental evidence supports Oparin's hypothesis on the origin of life because adenine is found in ____.

A
ATP

B
RNA

C
DNA

D
ATP, RNA and DNA
Question 9
1 / -0

Choose the correct answer from the alternatives given.
The end product of the Calvin cycle is

A
ribulose bisphosphate

B
phosphoglyceraldehyde (PGAL)

C
PEP carboxylase (PEP case)

D
carbon dioxide

Solution

The last phase of the Calvin cycle is labelled regeneration as the remaining PGAL is enzymatically converted from the three-carbon sugar-phosphate into more ribulose-1,5-bisphosphate (RuBP) so that the Calvin cycle can continue to go around again.
So, the correct option is, 'PGAL'.
Question 10
1 / -0

Which of the following is not true about photosynthesis?

A
In non-cyclic photophosphorylation, water is split and oxygen is released

B
Photosystem-II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation.

C
Cyclic system is used when there is insufficient $$NADP^+$$ present to absorb electrons in plant cells

D
More carbohydrate is produced during cyclic photophosphorylation than during non-cyclic photophosphorylation

Solution

Cyclic Photo-phosphorylation happens with the help of photosynthesis, a process of producing carbohydrates by green plants using carbon dioxide and water in the presence of sunlight. Cyclic photo-phosphorylation exists to provide energy for the Calvin cycle and involves the only p680 in photo-system ll and its product is ATP. Non-cyclic photo-phosphorylation is carried out using p700 in photo-system l and p680 in photo-system ll and it produces NADPH and ATP. There is no production of carbohydrate in the photosystems and hence cyclic or non-cyclic does not play a role.
So, the correct option is, 'More carbohydrate is produced during cyclic photophosphorylation than during non-cyclic photophosphorylation'.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 82

Result

Photosynthesis in Higher Plants Test - 82

Score

-

Rank

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SHARING IS CARING

Question 1

First treatment that is effective

Middle treatment that is effective

Last treatment that is important

Sum total of all treatments that counts

Solution

Question 2

Fifty-seven

One

Two

Thirty

Solution

Question 3

stomatal movement

energy transfer

chlorophyll synthesis

carbohydrate translocation

Solution

Question 4

P-PGA, Q-Glyoxylate, $$R-NH_{3}$$, S-Serine

P-Glycolate, Q-Glyoxylate, $$R - NH_{3}$$, S-Serine

P-Glycolate, Q-Glyoxylate, $$R - CO_{2}$$, S-Serine

P-RuBP, Q-Glycerate, $$R-CO_{2}$$, S-Serine

Solution

Question 5

Glucose is prepared at the source by photosynthesis which is converted to sucrose.

Loading at the source produces a hypotonic condition in phloem.

Loading of the phloem sets up a water potential gradient that facilitates the mass movement in the water.

Phloem tissue is composed of sieve tube cells, which form long columns with holes in their end walls called sieve plates.

Solution

Question 6

Compounds with large positive redox potential tend to denote electrons

Chlorophyll a and chlorophyll b have phytol tails which are hydrophobic

Cyclic electron transport permits the production of extra ATP without the synthesis of NADPH or the production of free oxygen

Crassulacean acid metabolism is present in the plants of Cucurbitaceac and Labiatae

Question 7

Facultative autotroph

Facultative heterotroph

Obligate heterotroph

Obligate autotroph

Question 8

ATP

RNA

DNA

ATP, RNA and DNA

Question 9

ribulose bisphosphate

phosphoglyceraldehyde (PGAL)

PEP carboxylase (PEP case)

carbon dioxide

Solution

Question 10

In non-cyclic photophosphorylation, water is split and oxygen is released

Photosystem-II makes noncyclic photophosphorylation more efficient than does cyclic photophosphorylation.

Cyclic system is used when there is insufficient $$NADP^+$$ present to absorb electrons in plant cells

More carbohydrate is produced during cyclic photophosphorylation than during non-cyclic photophosphorylation

Solution

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