Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 74

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Weekly Quiz Competition

Question 1
1 / -0

In the absence of which of the following will photosynthesis not occur in leaves?

A
Guard cells

B
Chlorophyll

C
Vacuole

D
Space between cells

Solution

The green pigment that presents in plant's leaves is termed as "Chlorophyll". In the leaves, chlorophyll absorbs energy from the sun and performs the procedure of photosynthesis.
The correct answer is option (b).
Question 2
1 / -0

Which metal element is found in the centre of the chlorophyll molecule?

A
Fe

B
Mg

C
Ne

D
Cu

Solution

A chlorophyll molecule consists of a tetrapyrrole ring attached to a central Magnesium atom and a phytol tail.
So, the correct answer is 'Mg'
Question 3
1 / -0

Who proposed the chemiosmotic theory of oxidative phosphorylation?

A
Krebs

B
Gibbs

C
Mitchell

D
Dixons

Solution

The chemiosmotic theory of Oxidative phosphorylation was proposed by Mitchell. According to this theory the synthesis of ATP in the mitochondria and chloroplast with the help of enzyme ATP synthase, using the energy released due to passive movement of ions like protons along their concentration gradient.
So, the correct answer is 'Mitchell'

Question 4

1 / -0

Match column I (enzymes) column II (phases/steps of dark reaction) (PGA -Phosphoglyceric acid, G3P - glyceraldehyde-3-phosphate, DHAP-Dihydroxyacetone phosphate, PEP -Phospho enol Pyruvate)

	Column I		Column II
a.	RuBisCO.	i.	Addition of iP to 3-PGA
b.	Phosphoglycerate kinase	ii.	Addition of $$CO_2$$ to PEP
c.	Triose phosphate isomerase.	iii.	Fixation of $$CO_2$$
d.	PEP carboxylase	iv.	Conversion of DHAP to G3P

a-iii, b-ii, c-i, d-iv

a-iii, b-i, c-iv, d-ii

a-ii, b-iv, c-i, d-iii

a-i, b-iii, c-ii, d-iv

Solution

RuBisCO (Ribulose-1,5 Bisphosphate Carboxylase Oxygenase) is an enzyme that brings about carboxylation of Ribulose -1, 5 bisphosphate by addition of $$CO_2$$ molecule to it.

Phosphoglycerate kinase is an enzyme that adds an iP group to 3-PGA to form 1,3 bisphosphoglyceric acid.

Triose phosphate isomerase catalyzes a reversible conversion of DHAP to G3P

PEP carboxylase catalyzes the addition of $$CO_2$$ molecule to Phospho enol pyruvate in $$C_4$$ cycle.

So, the correct answer is 'a-iii, b-i, c-iv, d-ii'

Question 5
1 / -0

In leaves, name the cell organelle and pigment that is responsible for green colour.

A
Chloroplast, chlorophyll

B
Chromoplast, chlorophyll

C
Leucoplast, zanthophyll

D
Chloroplast, carotene

Solution

The chloroplast is a type of plastid, which produces green colored pigment called chlorophyll. The chloroplast is involved in carrying out photosynthesis. It gives a green color to leaves. So, the correct answer is option A.
Question 6
1 / -0

The value of $$Q_{10}$$ for photosynthesis is

A
4

B
6

C
7

D
2

Solution

The $$Q_{10}$$ temperature coefficient is a measure of the rate of change of a biological or chemical system as a consequence of increasing the temperature by $$10^0$$ C. The value of the same for photosynthesis is 2.
Question 7
1 / -0

Select the incorrect matched pair with regard to $$C_{4}$$ cycle.
(a)
Primary $$CO_{2}$$ fixation product
-
PGA
(b)
Site of initial carboxylation
-
Mesophyll cells
(c)
Primary $$CO_{2}$$ acceptor
-
PEP
(d)
$$C_{4}$$ plant
-
Maize
(e)
Location of enzyme RuBisCO
-
Bundle sheath cells

A
(a)

B
(b)

C
(c)

D
(d)

E
(e)

Solution

PEP carboxylase catalyzes carboxylation of phosphoenolpyruvate (PEP, the primary acceptor of $$CO_2$$) to form four carbon compound oxaloacetate in mesophyll cells of $$C_4$$ plants. Initial carboxylation reaction of $$C_4$$ cycle takes place in mesophyll cell wherein oxaloacetate is converted into the intermediate malate. Malate is transported to bundle-sheath cell and is decarboxylated to produce pyruvate and $$CO_2$$. Rubisco present in bundle sheath cells then carries out fixation of released carbon dioxide. Maize is a $$C_4$$ with characteristic kranz anatomy consisting of mesophyll and bundle sheath cells. Thus, the correct answer is option A.
Question 8
1 / -0

Artiplex spongiosa is a

A
$${C_3 }$$ plant

B
$${C_ 4 }$$ plant

C
CAM plant

D
All of the above

Solution

Artiplex spongiosa is a $$C_4$$ plant where PEP carboxylase fixes bicarbonate in the mesophyll cells of the leaf and the resulting four-carbon compound, malate, is shuttled into the bundle sheath cells where it releases CO for fixation by RuBisCO. Thus, option B is correct.
Question 9
1 / -0

As compared to a C$$_{3}$$-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C$$_{4}$$-plants -

A
Zero

B
Six

C
Two

D
Twelve

Solution

So the correct option is D.
Question 10
1 / -0

$${C_{40} H_{56} O_4}$$ is the chemical formula of

A
Chlorophyll a

B
Carotenes

C
Chlorophyll b

D
Carotenols

Solution

Carotenol is a yellow pigment. The chemical formula is C$$_{40}H_{56}O_{2}$$.
Chlorophyll is a green pigment found in cyanobacteria and the chloroplasts of algae and plants. The chemical formula of chlorophyll a is C$$_{55}H_{72}O_{5}N_{4}Mg$$. The chemical formula of chlorophyll b ic C$$_{55}H_{72}O_{6}N_{4}Mg$$.
Carotene is an orange photosynthetic pigment important for photosynthesis. The chemical formula is C$$_{40}H_{56}$$.
So, the correct answer is option D.

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(a)	Primary $$CO_{2}$$ fixation product	-	PGA
(b)	Site of initial carboxylation	-	Mesophyll cells
(c)	Primary $$CO_{2}$$ acceptor	-	PEP
(d)	$$C_{4}$$ plant	-	Maize
(e)	Location of enzyme RuBisCO	-	Bundle sheath cells

Photosynthesis in Higher Plants Test - 74

Result

Photosynthesis in Higher Plants Test - 74

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SHARING IS CARING

Question 1

Guard cells

Chlorophyll

Vacuole

Space between cells

Solution

Question 2

Fe

Mg

Ne

Cu

Solution

Question 3

Krebs

Gibbs

Mitchell

Dixons

Solution

Question 4

a-iii, b-ii, c-i, d-iv

a-iii, b-i, c-iv, d-ii

a-ii, b-iv, c-i, d-iii

a-i, b-iii, c-ii, d-iv

Solution

Question 5

Chloroplast, chlorophyll

Chromoplast, chlorophyll

Leucoplast, zanthophyll

Chloroplast, carotene

Solution

Question 6

4

6

7

2

Solution

Question 7

(a)

(b)

(c)

(d)

(e)

Solution

Question 8

$${C_3 }$$ plant

$${C_ 4 }$$ plant

CAM plant

All of the above

Solution

Question 9

Zero

Six

Two

Twelve

Solution

Question 10

Chlorophyll a

Carotenes

Chlorophyll b

Carotenols

Solution

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