Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 44

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Question 1
1 / -0

Find out which one is not related to leaves?

A
Photosynthesis

B
Respiration

C
Transpiration

D
Transportation

Solution

Photosynthesis is the process by which plants use the light energy to convert carbon dioxide and water to synthesize glucose. This takes place in chlorophyll of leaves.
Respiration is the breakdown of glucose to release ATP.
Transpiration is the loss of water from leaves.
All these 3 processes take place in the leaves f the plant and are related to it.
Transportation is the process by which the movement of material takes back and forth in plants. This happens by the xylem and the phloem tissues.
So, the correct option is 'Transporation"
Question 2
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In Photosynthesis

A
$$H_2O$$ and $$CO_2$$ are reduced

B
$$H_2O$$ is reduced and $$CO_2$$ is oxidised

C
$$H_2O$$ and $$CO_2$$ are oxidized

D
$$H_2O$$ is oxidized and $$CO_2$$ is reduced

Solution

During photosynthesis, the hydrogen from a stable and oxidizable compound reduces the carbon dioxide to carbohydrates.
In green plants this oxidizable compound and the donor of hydrogen is water.
Here the water is oxidized to oxygen.
The reaction involved in photosynthesis is-
6CO₂ + 6H₂O ------> C₆H₁₂O₆ + 6O₂
So, the correct option is 'H₂O is oxidized and CO₂ is reduced'
Question 3
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Kranz anatomy is found in case of

A
Flower

B
Root

C
Leaf

D
Stem

Solution

In the leaves of C₄plants, bundle sheath cells are present in form of rings around the vascular bundle. The arrangement is called kranz and the anatomy is called kranz type of anatomy.
So, the correct option is ‘Leaf’.
Question 4
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$$Na^+, K^+$$ pump is found in membranes of many cells, like nerve cells. It work against electro chemical gradient and involve an integral protein ATP. For each molecule of ATP used

A
3 ions of $$Na^+$$ pumped out and 2 $$K^+$$ are taken in.

B
3 ions of $$Na^+$$ are taken in and 2 $$K^+$$ are pumped out.

C
2 ions of $$Na^+$$ are thrown out and 3 $$K^+$$ are absorbed.

D
3 ions of $$K^+$$ are absorbed and 3 $$Na^+$$ are pumped out.

Solution

The sodium-potassium pump is involved in the movement of the sodium and potassium ions across the cell membrane. In this process, ATP is hydrolyzed to liberate energy required for the transport. Hence the process is active that takes place with the help of $$Na^+$$/$$K^+$$-ATPase enzyme. In this, three sodium ions are expelled outside the cell and two potassium ions are moved into the cell. Thus the correct answer is option A.
Question 5
1 / -0

Study of light absorption by chlorophyll is

A
Absorption spectroscopy

B
Infra-red spectroscopy

C
Nuclear magnetic resonance spectroscopy

D
Emission spectroscopy
Question 6
1 / -0

Cell organelle taking part in photorespiration is

A
Glyoxisome

B
Peroxisome

C
Dictyosome

D
E.R.
Solution
- Peroxisomes (microbody) are small organelle which contains reducing and oxidising enzyme catalase.
- It helps in the breakdown of long chain fatty acids through beta-oxidation and converts them into to medium chain fatty acids, which are subsequently broken down to carbon dioxide and water in the mitochondria (photorespiration).
- So, the correct answer is 'Peroxisome'.
Question 7
1 / -0

The mechanism of ATP formation both in mitochondria and chloroplast is best explained by

A
Relay pump theory of Godlewski

B
Cholondy - Wents model

C
Cheimoosmotic theory

D
Munch's mass flow hypothesis

Solution

As per Peter Mitchell's chemiosmotic coupling hypothesis, outward pumping of protons across the inner chloroplast or mitochondrial membrane result in accumulation of protons between the outer membrane and inner membrane. A proton gradient is thus established. As proton now flow back passively down the gradient the proton motive force is utilized to synthesize ATP.
Question 8
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Photophosphorylation consists of

A
Cyclic and non-cyclic phosphorylation

B
Oxidative phosphorylation

C
Substrate phosphorylation

D
None of the above.

Solution

Photosynthesis is an anabolic process happening in green plants during which plant body synthesizes its own food material by taking carbon dioxide from atmosphere and water from the soil in presence of sunlight. It proceeds in a sequence of light phase and dark phase.
Light phase is also known as a photochemical phase because it is a light dependent phase. During this phase, the formation of high-energy chemical intermediates ATP and NADPH$$_{2}$$ takes place. ATP and NADPH$$_{2}$$ are the assimilatory power of photosynthesis. Light phase also includes light absorption, water splitting and release of oxygen. Two photosynthetic units called Photosystem I and Photosystem II are also involved in light phase.
Dark phase is the phase which is independent of light. But, it is dependent on the products of light reaction (ATP and NADPH$$_{2}$$). In this phase, assimilation of carbon dioxide takes place during which carbon dioxide and water combine to form glucose.
Question 9
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Energy required for ATP synthesis in PS II comes from

A
Proton gradient

B
Electron gradient

C
Reduction of glucose

D
Oxidation of glucose

Solution

2H₂O -------------------------> 4H⁺ + O₂ + 4e⁻
This reaction takes place in the inner side of the thylakoid membrane, and so the protons formed are thus trapped in the lumen of thylakoid.
As electrons move through photosystems, these protons are transported across the membrane.
This gradient is important because the breakdown of this leads to the release of energy.
So, the correct answer is 'Proton gradient'
Question 10
1 / -0

Chlorophyll occurs in chloroplast

A
Inner membrane

B
Thylakoid membrane

C
Outer membrane

D
Stroma
Solution
The chloroplast is a plastid which contains chlorophyll (green pigment) within the thylakoid membranes of the organelle.
The thylakoid membrane is a layer which surrounds the thylakoid within a chloroplast where the light-dependent reactions take place.
It is the main site of synthesis of glucose by the process called photosynthesis.
So, the correct answer is 'Thylakoid membrane'.

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Photosynthesis in Higher Plants Test - 44

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Photosynthesis in Higher Plants Test - 44

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Question 1

Photosynthesis

Respiration

Transpiration

Transportation

Solution

Question 2

$$H_2O$$ and $$CO_2$$ are reduced

$$H_2O$$ is reduced and $$CO_2$$ is oxidised

$$H_2O$$ and $$CO_2$$ are oxidized

$$H_2O$$ is oxidized and $$CO_2$$ is reduced

Solution

Question 3

Flower

Root

Leaf

Stem

Solution

Question 4

3 ions of $$Na^+$$ pumped out and 2 $$K^+$$ are taken in.

3 ions of $$Na^+$$ are taken in and 2 $$K^+$$ are pumped out.

2 ions of $$Na^+$$ are thrown out and 3 $$K^+$$ are absorbed.

3 ions of $$K^+$$ are absorbed and 3 $$Na^+$$ are pumped out.

Solution

Question 5

Absorption spectroscopy

Infra-red spectroscopy

Nuclear magnetic resonance spectroscopy

Emission spectroscopy

Question 6

Glyoxisome

Peroxisome

Dictyosome

E.R.

Solution

Question 7

Relay pump theory of Godlewski

Cholondy - Wents model

Cheimoosmotic theory

Munch's mass flow hypothesis

Solution

Question 8

Cyclic and non-cyclic phosphorylation

Oxidative phosphorylation

Substrate phosphorylation

None of the above.

Solution

Question 9

Proton gradient

Electron gradient

Reduction of glucose

Oxidation of glucose

Solution

Question 10

Inner membrane

Thylakoid membrane

Outer membrane

Stroma

Solution

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