Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

Choose the correct answer from the alternatives given.
Which of following is not a major photosynthetic pigment in plants

A
Chlorophyll a

B
Chlorophyll b

C
Chlorophyll c

D
Carotenoids

Solution

Chlorophyll c is a form of chlorophyll found in certain marine algae, including the photosynthetic Chromista (e.g. diatoms, brown algae) and dinoflagellates. On the other hand, two types of chlorophyll exist in the photosystems of green plants: chlorophyll a and b. Chlorophyll a is the primary photosynthetic pigment while chlorophyll b is the accessory pigment that collects energy and passes it on to chlorophyll a.
So, the correct option is, 'Chlorophyll c'.
Question 2
1 / -0

Choose the correct answer from the alternatives given.
The number of ATP molecules formed during photochemical reaction of photosynthesis is:

A
6

B
12

C
18

D
24
Question 3
1 / -0

Choose the correct answer from the alternatives given.
Photosynthetic pigments

A
absorb specific wavelengths of light in their absorption spectra

B
include chlorophyll a, b, and the carotenoids

C
have their absorption spectra analysed using a spectrophotometer

D
all of the above

Solution

A photosynthetic pigment (accessory pigment; chloroplast pigment; antenna pigment) is a pigment that is present in chloroplasts or photosynthetic bacteria and captures the light energy necessary for photosynthesis. Chlorophyll a is the main pigment. It absorbs light mainly in the red and blue regions of the spectrum. Chlorophyll b, xanthophyll and carotene are 'accessory pigments'. They absorb light from other regions of the spectrum and pass the energy onto chlorophyll a. The action spectrum shows the rate of photosynthesis at different wavelengths. The absorption spectrum shows how strongly the pigments absorb at different wavelengths and recorded by a spectrophotometer.
So, the correct option is, 'All of the above'.
Question 4
1 / -0

The major enzyme that catalyzes the reduction of carbon dioxide is called

A
ribulose bisphosphate carboxylase (rubisco)

B
phosphoglyceraldehyde (PGAL)

C
PEP carboxylase (PEPcase)

D
none of these

Solution

The enzyme RuBisCO incorporates carbon dioxide into an organic molecule and then the organic molecule is reduced. Carbon dioxide diffuses into the stroma of chloroplasts and combines with a five-carbon sugar, ribulose1,5-biphosphate (RuBP). The enzyme that catalyzes this reaction is referred to as RuBisCo, a large molecule that may be the most abundant organic molecule on the Earth.
So, the correct option is 'RUBISCO'.
Question 5
1 / -0

Choose the correct answer from the alternatives given.
What organisms are capable of photosynthesis?

A
Plants only

B
Plants and algae only

C
Plants and some bacteria only

D
Plants, algae and some bacteria

Solution

Photosynthetic organisms, also known as photoautotrophs, are organisms that are capable of photosynthesis. Some of these organisms include higher plants, some protists, algae and bacteria.
Thus, the correct answer is 'Plants, algae and some bacteria.'
Question 6
1 / -0

Choose the correct answer from the alternatives given.
In most plants carbohydrate is transported from leaves, where it is synthesized, to other parts, where it is used, in the form of

A
sucrose

B
fructose

C
maltose

D
starch

Solution

In times of rapid photosynthesis, the main product is glucose, but it is usually converted to the larger sugar sucrose. These sugars that are synthesized in the leaves must be transported to other parts of the plant. Phloem is composed of living cells that transport water solution of sugars that we commonly call sap.
Thus, the correct answer is Sucrose.'
Question 7
1 / -0

Choose the correct answer from the alternatives given.
Photorespiration is a form of

A
fixation of carbon dioxide in $$C_4$$ plants

B
fixation of carbon dioxide in $$C_3$$ plants

C
release of carbon dioxide in $$C_4$$ plants

D
release of carbon dioxide in $$C_3$$ plants

Solution

Photo-respiration is a respiratory process in many higher plants by which they take up oxygen in the light and give out some carbon dioxide, contrary to the general pattern of photosynthesis. Plants which use only the Calvin cycle for fixing the carbon dioxide from the air are known as C3 plants. C3 plants have the disadvantage that in hot dry conditions their photosynthetic efficiency suffers because of a process called photorespiration.
So, the correct option is, 'release of carbon dioxide in C3 plants'.
Question 8
1 / -0

Choose the correct answer from the alternatives given.
The enzyme which catalyzes the photosynthesis in $$C_4$$ cycle is

A
PEP carboxylase

B
RuBP carboxylase

C
carbonic anhydrase

D
hexokinase

Solution

CO$$_2$$ is incorporated into a five-carbon sugar named ribulose bisphosphate (RuBP) to form a six-carbon intermediate which immediately splits in half to form two molecules of 3-phosphoglycerate. The enzyme which catalyzes this first step is RuBP carboxylase or rubisco.
Hence the correct answer is 'RuBP carboxylase.'
Question 9
1 / -0

Choose the correct answer from the alternatives given.
Munchs hypothesis is proposed to explain the process of.

A
ascent of sap

B
absorption of water

C
conduction of organic solutes

D
all of these
Question 10
1 / -0

Photosynthesis is mainly responsible for the existence of

A
Plants on this earth

B
Animals on this earth

C
Both plants and animals

D
None of these

Solution

Photosynthesis is the process of production of carbohydrates in plants (autotrophs) and these serve as fuel or food for the heterotrophs to survive. Hence, photosynthesis is the main process of responsible for the sustenance of both the plants and animals.
So, the correct option is, 'both plants and animals'.

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 63

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Photosynthesis in Higher Plants Test - 63

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SHARING IS CARING

Question 1

Chlorophyll a

Chlorophyll b

Chlorophyll c

Carotenoids

Solution

Question 2

6

12

18

24

Question 3

absorb specific wavelengths of light in their absorption spectra

include chlorophyll a, b, and the carotenoids

have their absorption spectra analysed using a spectrophotometer

all of the above

Solution

Question 4

ribulose bisphosphate carboxylase (rubisco)

phosphoglyceraldehyde (PGAL)

PEP carboxylase (PEPcase)

none of these

Solution

Question 5

Plants only

Plants and algae only

Plants and some bacteria only

Plants, algae and some bacteria

Solution

Question 6

sucrose

fructose

maltose

starch

Solution

Question 7

fixation of carbon dioxide in $$C_4$$ plants

fixation of carbon dioxide in $$C_3$$ plants

release of carbon dioxide in $$C_4$$ plants

release of carbon dioxide in $$C_3$$ plants

Solution

Question 8

PEP carboxylase

RuBP carboxylase

carbonic anhydrase

hexokinase

Solution

Question 9

ascent of sap

absorption of water

conduction of organic solutes

all of these

Question 10

Plants on this earth

Animals on this earth

Both plants and animals

None of these

Solution

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