Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

The rate of photosynthesis is influenced by

A
Structure of leaf and its chlorophyll content.

B
Accumulation within the chlorophyll bearing cells of the products of photosynthesis.

C
Protoplasmic influences including enzymes.

D
All of the above.
Solution
The structure of the leaf, its chlorophyll content, protoplasmic influences including enzymes, and the accumulation of the products of photosynthesis within the chlorophyll-bearing cells all influence the rate of photosynthesis.
As the chlorophyll content increases, the rate of photosynthesis increases.
The rate of photosynthesis depends on the structure of a leaf, i.e., if the leaf is wide enough, an area that absorbs light energy is more which ultimately increases the rate of photosynthesis.
Accumulation of end products in the chlorophyll-bearing cells also influences the rate of photosynthesis as the end product act as an inhibitor for photosynthesis.
Protoplasmic influences such as enzymes also influence the rate of photosynthesis as with increase in enzyme concentration, the rate of photosynthesis also increases.
So, the correct answer is option D.
Question 2
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In case of $$ {C_4}$$ pathway, $${C O_2}$$ combines with

A
PGA

B
PEP

C
RDP

D
RMP

Solution

In C$$_4$$ plants, PEP carboxylase fixes PEP with carbon dioxide in the mesophyll cells of the leaf and results in four carbon compound, malate which is shuttled into the bundle sheath cells. Thus, option B is correct.
PGA, RDP, RMP are the intermediate products of C$$_3$$ pathway.
Therefore, the correct answer is option B.
Question 3
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Plants like sugarcane and sorghum have indigenously developed system to overcome the loss by photorespiration as they are ......... plants.

A
$${C_4}$$

B
$${C_3}$$

C
$${C_2}$$

D
$${C_1}$$
Solution
- C4 plants use carbon fixation to achieve photosynthesis similarly to C3 plants, but their method has evolved more recently, and thus, has a few advantages over C3 plants.
- The main disadvantage of C3 plants is that in hot or dry climates, Rubisco uses up oxygen which leads to photorespiration.
- Hence, Plants like sugarcane and sorghum have indigenously developed system to overcome the loss by photorespiration as they are C4 plants.
- So, the correct answer is 'C4'.
Question 4
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Pick up $${C_4}$$ plant

A
Papaya

B
Potato

C
Maize

D
Pea
Solution
C$$_4$$ carbon fixation is one of three biochemical mechanisms, along with C$$_3$$ and CAM photosynthesis, used in carbon fixation.
It is named for the 4-carbon molecule present in the first product of carbon fixation in the small subset of plants known as C$$_4$$ plants, in contrast to the 3-carbon molecule products in C$$_3$$ plants. Examples of C$$_4$$ plants include the food crops maize, sugar cane, millet, and sorghum. Thus, option C is correct.
Potato and papaya are C$$_3$$ plants. Pea is a C$$_2$$ plant.
Question 5
1 / -0

In noncyclic photophosphorylation, PS I is reduced by:

A
Electron from ferredoxins

B
Electron from PS II

C
Hydrogen from PS II

D
Hydrogen from water

Solution

In noncyclic photophosphorylation, PS I is reduced by an electron from PS II. When light excites P-$${_6}$$$${_8}$$$${_0}$$ it releases electrons and via intermediate electrons transporters it reaches PS I.
So, the correct answer is option B.
Question 6
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For chlorophyll formation most important elements are

A
Iron and Ca

B
Iron and Mg

C
Mg and Ca

D
All of the above

Solution

Iron and magnesium are required for chlorophyll function. Iron is required for conversion of photo chlorophyll to chlorophyll. Magnesium is part of the porphyrin head of chlorophyll. Thus, option B is correct.
So, the correct answer is option B.
Question 7
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Photoxidation refers to

A
Oxidation of food (carbohydrates) in the presence of light

B
Oxidation of chlorophyll and other inclusions of cell

C
Oxidation of outer and inner membrane of mitochondria

D
None of the above

Solution

Chlorophyll absorbs a photon of light and gets transferred to higher energy levels. It releases a couple of electrons during photosynthesis by the process of oxidation. This process is called as photo-oxidation.
So, the correct answer is option B.
Question 8
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Which statement about photosynthesis is false?

A
The electron carriers involved in photo-phosphorylation are located on the thylakoid membranes.

B
Photosynthesis is a redox process in which water is oxidised and carbon dioxide is reduced.

C
The enzymes required for carbon fixation are located only in the stroma of chloroplasts.

D
In green plants, both PS-I and PS-II are not required for the formation of $${NADPH + H^+}$$.

Solution

Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel the organisms' activities. The electron carriers involved in photo-phosphorylation are located on the thylakoid membranes. Photosynthesis is a redox process in which water is oxidised and carbon dioxide is reduced. The stroma houses the enzymes needed to assemble carbon molecules. So, all these statements are true. In green plants, only PS-I is required for the formation of NADPH$$^{+}H^{+}$$. Thus, this statement is false. So, option D is correct and other options are incorrect.
Question 9
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Photosynthesis in $${C_4}$$ plants is relatively less limited by atmospheric $${C O_2}$$ levels, because

A
Four carbon acids are the primary initial $${C O_2}$$ fixation products

B
The primary fixation of $${C O_2}$$ is mediated via PEP carboxylase

C
Effective pumping of $${C O_2}$$ into bundle sheath cells

D
Rubisco in $$ {C_4}$$ plants has higher affinity for $${C O_2}$$

Solution

Photosynthesis in $$C_4$$ plants is relatively less limited by atmospheric $$CO_2$$ levels, because the primary fixation of $$CO_2$$ is mediated via PEP carboxylase. At relatively low concentrations of $$CO_2$$, most $$CO_2$$ will be fixed by PEP carboxylase. $$C_4$$ pathway uses more energy than $$C_3$$ pathway.
So, the correct answer is option B.
Question 10
1 / -0

The process of photorespiration in $${C_3}$$ plants starts from

A
Phosphoglycerate

B
Phosphoglycolate

C
Glycerate

D
Glycine

Solution

The process of photorespiration in C3 plants takes place in the presence of excess $$O_2$$ in the atmosphere. RUBISCO, the main enzyme of Calvin cycle that fixes $$CO_2$$ acts as ribulose bis-phosphate oxygenase under the low atmospheric concentration of $$CO_2$$ (below 1%) and increased concentration of $$O_2$$. In the presence of high concentration of $$O_2$$, the enzyme RuBP oxygenase splits a molecule of ribulose-1,5-bisphosphate into one molecule each of 3-phosphoglyceric acid and 2-phosphoglycolate which is the first step of the process.
Thus, the correct answer is option B.

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Photosynthesis in Higher Plants Test - 26

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Photosynthesis in Higher Plants Test - 26

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Question 1

Structure of leaf and its chlorophyll content.

Accumulation within the chlorophyll bearing cells of the products of photosynthesis.

Protoplasmic influences including enzymes.

All of the above.

Solution

Question 2

PGA

PEP

RDP

RMP

Solution

Question 3

$${C_4}$$

$${C_3}$$

$${C_2}$$

$${C_1}$$

Solution

Question 4

Papaya

Potato

Maize

Pea

Solution

Question 5

Electron from ferredoxins

Electron from PS II

Hydrogen from PS II

Hydrogen from water

Solution

Question 6

Iron and Ca

Iron and Mg

Mg and Ca

All of the above

Solution

Question 7

Oxidation of food (carbohydrates) in the presence of light

Oxidation of chlorophyll and other inclusions of cell

Oxidation of outer and inner membrane of mitochondria

None of the above

Solution

Question 8

The electron carriers involved in photo-phosphorylation are located on the thylakoid membranes.

Photosynthesis is a redox process in which water is oxidised and carbon dioxide is reduced.

The enzymes required for carbon fixation are located only in the stroma of chloroplasts.

In green plants, both PS-I and PS-II are not required for the formation of $${NADPH + H^+}$$.

Solution

Question 9

Four carbon acids are the primary initial $${C O_2}$$ fixation products

The primary fixation of $${C O_2}$$ is mediated via PEP carboxylase

Effective pumping of $${C O_2}$$ into bundle sheath cells

Rubisco in $$ {C_4}$$ plants has higher affinity for $${C O_2}$$

Solution

Question 10

Phosphoglycerate

Phosphoglycolate

Glycerate

Glycine

Solution

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