Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 65

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Question 1
1 / -0

Refer to the given reaction.
$$2H_{2}O \rightarrow 4H^{+} + O_{2} + 4{e^-}$$
Where does this reaction take place in the chloroplasts of plants?

A
Outer surface of thylakoid membrane

B
Inner surface of thylakoid membrane

C
In the matrix (stroma)

D
Intermembrane space

Solution

The splitting of water is associated with the PS II. Water is split into $$H^{+},[O]$$ and electrons. The electrons needed to replace those removed from photosystem I are provided by photosystem II.
$$2H_{2}O\rightarrow 4H^{+} + O_{2} + 4_{e^-}$$
Water splitting complex is associated with the PSII, which itself is physically located on the inner side of the membrane of the thylakoid.
So the correct answer is 'Inner surface of thylakoid membrane'.
Question 2
1 / -0

Select the correct option:
Study the following statements regarding chemiosmotic hypothesis in mitochondria and select the correct ones.
(i) $${F}_{1}$$ headpiece contains the site for the syntesis of ATP from ADP+Pi.
(ii) $${F}_{0}$$ part forms the channel through which protons cross the inner membrane.
(iii) For each ATP produced, $${2H}^{+}$$ pass through $${F}_{0}$$ from the intermembrane space to the matrix down the electrochemical proton gradient.

A
(i) and (ii)

B
(ii) and (iii)

C
(i) and (iii)

D
(i),(ii) and (iii)

Solution

In the given question, the correct statements are as follows:

(i) F1 headpiece contains the site for the synthesis of ATP from ADP+Pi.

(ii) F0 part forms the channel through which protons cross the inner membrane.

(iii) For each ATP produced, 2H+ pass through F0 from the intermembrane space to the matrix down the electrochemical proton gradient.
So, the correct answer is '(i),(ii) and (iii)'.
Question 3
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The biochemical objective of PS I is to

A
oxidise NADPH

B
hydrolyse ATP

C
phosphorylate ADP

D
reduce NADP+

Solution

During Z-scheme, electron extruded by PS I passes through special chlorophyll X, Fe - S ferredoxin, to finally reach $$NADP^{+}$$. $$ NADP^{+}$$ is ultimately reduced by combining with $$ H^{+}$$ (release during photolysis) with the help of $$NADP^{+}$$ reductase enzyme.
Question 4
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Identify the correct option:
Given graph represents the absorption spectra of three photosynthetic pigments, chl $$a$$ chl $$b$$ and $$\beta$$-carotene.
Select the correct statement regarding this.

A
The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called the absorption spectrum.

B
Chl a and chl b absorb maximum light in the blue and red wavelengths of light

C
Rate of photosynthesis is maximum in blue and red wavelengths of light.

D
All of these

Solution

The graphical curve showing the amount of energy of different wavelengths of light absorbed by a pigment is called absorption spectrum. It is studied with the help of spectrophotometer. The absorption spectra of chlorophylls a and b show that they absorb maximum light in the blue-violet and red wavelength. The pigments are often known after the wavelength which is absorbed to the maximum,
e.g. $$Chl \,a_{673}, Chl \,a_{683} (P _{680}), Chl\, a _{703} (P_{700}).$$
So the correct answer is 'All of these'.
Question 5
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Chlorophyll a appears ............. in colour and chlorophyll b appears ................ in color in the chromatogram.

A
Bluish green, yellowish green

B
Yellowish green, bluish green

C
Blue, blue

D
Green, green

Solution

Paper chromatography is a technique used to separate pigments according to their relative solubility and molecular weight. A chromatographic separation of the leaf pigments shows that the color that we see in leaves is not due to a single pigment but due to four pigments
Chlorophyll a (appears bright or blue-green in the chromatogram)
chlorophyll b (yellow-green)
xanthophylls (yellow)
carotenoids (yellow to yellow-orange).
So the correct answer is 'Bluish green, yellowish green'.
Question 6
1 / -0

If green plant cells are incubated with $$ O^{18} $$ - labeled water, which of the following will become radioactive when the cells are exposed to light?

A
$$ O_{2}$$

B
$$CO_{2}$$

C
$$H_{2}O$$

D
Sugar

Solution

Ruben and Kamen (1941), while working on chlorella (unicellular green alga ) found that oxygen liberated during photosynthesis comes from water.
(i) When normal $$ H_{2}O $$ and radioactive $$ CO_{2} $$(i.e.$$CO^{18}_{2}$$) were used, normal $$ O_{2}$$ is evolved.

$$nCO_{2}^{18} + nH_{2}O \xrightarrow[Chlorophyll]{Light} (CH_{2}O^{18})_{n} + nO_{2} \uparrow (normal) + H_{2}O $$

(ii) When normal $$CO_{2}$$ radioactive $$ H_{2}O $$(i.e.$$H_{2}O^{18}$$) were used, radioactive $$O_{2}$$ (i.e.$$O_{2}^{18}$$) is evolved.

$$nCO_{2}+nH_{2}O^{18}\rightarrow (CH_{2}O)_{n} + O_{2}^{18} \uparrow(radioactive\,\, oxygen) + H_{2} O $$

So the correct answer is '$$O_2$$'.
Question 7
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At least a half of the total $$CO_{2}$$ fixation on- Earth is carried out through photosynthesis by

A
angiosperms

B
gymnosperms

C
algae

D
bryophytes

Solution

Nearly 50% of total carbon dioxide fixation is carried out by algae through photosynthesis. Photosynthesis by algae releases,'oxygen in the immediate aquatic environment. It is essential for respiration of aquatic life.
Question 8
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The synthesis of complex organic substances from simple inorganic raw materials in the presence of sunlight and chlorophyll is called ..........., which is a ............ process.

A
Photosynthesis, anabolic

B
Photosynthesis, catabolic

C
Respiration, anabolic

D
Respiration, catabolic

Solution

Photosynthesis is an enzyme regulated anabolic process that involves the synthesis of compounds.
The equation for photosynthesis can be summarised as follows :

$$6CO_{2} + 12 H_{2}O$$ $$\dfrac {Chlorophyll} {Radiant \,\,energy (686 cal)}$$ $$C_{6} H_{12} O_6+ 6H_{2}O + 6O_{2} $$
Question 9
1 / -0

Which of the following is an incorrect combination of organism with its chromosome number in mieocyte and in gamete?

A
Onion, $$24, 12$$

B
Ophioglossum, $$1260, 630$$

C
Human beings, $$46, 23$$

D
Fruit fly, $$8, 4$$

Solution

Chromosome number in meiocyte $$(2n)$$ of onion cell is $$32$$, while chromosome number in gamete $$(n)$$ is $$16$$.
Question 10
1 / -0

Photosynthetic pigments such as chl $$a$$, chl $$b$$, xanthophyll and carotene can be separated by which of the following techniques?

A
Paper chromatography

B
Gel Electrophoresis

C
X-ray diffusion

D
ELISA test

Solution

Paper chromatography is a technique used to separate pigments according to their relative solubility and molecular weight. A chromatographic separation of the leaf pigments shows that the color that we see in leaves is not due to a single pigment but due to four pigments ;
chlorophyll a (appears bright or blue-green in the chromatogram)
chlorophyll b (yellow-green)
xanthophylls (yellow)
carotenoids (yellow to yellow-orange).
So the correct answer is 'Paper chromatography'.

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Photosynthesis in Higher Plants Test - 65

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Photosynthesis in Higher Plants Test - 65

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Question 1

Outer surface of thylakoid membrane

Inner surface of thylakoid membrane

In the matrix (stroma)

Intermembrane space

Solution

Question 2

(i) and (ii)

(ii) and (iii)

(i) and (iii)

(i),(ii) and (iii)

Solution

Question 3

oxidise NADPH

hydrolyse ATP

phosphorylate ADP

reduce NADP+

Solution

Question 4

The curve showing the amount of absorption of different wavelengths of light by a photosynthetic pigment is called the absorption spectrum.

Chl a and chl b absorb maximum light in the blue and red wavelengths of light

Rate of photosynthesis is maximum in blue and red wavelengths of light.

All of these

Solution

Question 5

Bluish green, yellowish green

Yellowish green, bluish green

Blue, blue

Green, green

Solution

Question 6

$$ O_{2}$$

$$CO_{2}$$

$$H_{2}O$$

Sugar

Solution

Question 7

angiosperms

gymnosperms

algae

bryophytes

Solution

Question 8

Photosynthesis, anabolic

Photosynthesis, catabolic

Respiration, anabolic

Respiration, catabolic

Solution

Question 9

Onion, $$24, 12$$

Ophioglossum, $$1260, 630$$

Human beings, $$46, 23$$

Fruit fly, $$8, 4$$

Solution

Question 10

Paper chromatography

Gel Electrophoresis

X-ray diffusion

ELISA test

Solution

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