Photosynthesis in Higher Plants Test

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Photosynthesis in Higher Plants Test - 64

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Question 1
1 / -0

Choose the correct answer from the alternatives given regarding $$C_4$$ plants

A
store carbon dioxide temporarily as oxaloacetate

B
are found in hot dry climates

C
have a net photosynthetic rate two to three times that of $$C_3$$ plants

D
all of the above

Solution

Some plants that live in hot, dry climates maintain low oxygen levels in their leaves by keeping the stomata closed to prevent water loss. To get adequate CO₂for photosynthesis, C4 plants have adapted to photorespiration by modifying the Calvin-Benson cycle. In C4 plants photorespiration does not occur. This is because they have a mechanism that increases the concentration of CO2 at the enzyme site. The C4 pathway is certainly more efficient than the C3 pathway in the sense of carbon fixation. In C4 plants, cells are exposed to oxygen and have no RuBisCO to do photosynthesis. The CO2 joins with another carbon compound to make a C4 chemical called oxaloacetic acid.
So, the correct option is, 'all of the above'.
Question 2
1 / -0

The absorption of radiant energy from Sun is mainly associated with:

A
cytoplasm

B
chloroplasts

C
mitochondria

D
ribosomes

Solution

Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant. Chloroplasts capture light energy from the sun to produce the free energy stored in ATP and NADPH through a process called photosynthesis. Chloroplasts get energy from the sunlight with the molecule chlorophyll. Chlorophyll is a pigment or compound that is able to absorb the specific type of wavelength of energy from the Sun.
So, the correct option is, 'chloroplasts'.
Question 3
1 / -0

The light-independent reactions proceed in the

A
cytoplasm

B
stroma

C
plasma membrane

D
grana

Solution

The light-independent reactions, or dark reactions, of photosynthesis are chemical reactions that convert carbon dioxide and other compounds into glucose. These reactions occur in the stroma, the fluid-filled area of a chloroplast outside the thylakoid membranes.
So, the correct option is, 'Stroma'.
Question 4
1 / -0

The Calvin-Benson cycle starts when

A
light is available

B
light is not available

C
carbon dioxide is attached to RuBP

D
electrons leave a photosystem

Solution

The Calvin cycle has three stages. In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, the organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue.
So, the correct option is, 'carbon dioxide is attached to RuBP'.
Question 5
1 / -0

The stage of photosynthesis that actually produces sugar is

A
the Calvin cycle

B
photosystem-l

C
photosystem-Il

D
the light reactions

Solution

The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP. These reactions use chemical energy from NADPH and ATP that were produced in the light reactions. The final product of the Calvin cycle is glucose.
So, the correct option is, 'Calvin cycle'.
Question 6
1 / -0

Light energy is changed into chemical energy during the process of

A
respiration

B
transpiration

C
photosynthesis

D
digestion

Solution

During the process of photosynthesis, light penetrates the cell and passes into the chloroplast. The light energy is intercepted by chlorophyll molecules on the granal stacks. Some of the light energy is converted to chemical energy. During this process, phosphate is added to a molecule to cause the formation of ATP.
Question 7
1 / -0

NADPH is generated through _________ in plants.

A
Photosystem II

B
Anaerobic respiration

C
Glycolysis

D
Photosystem I

Solution

NADPH is the reduced form of NADP$$^+$$ that is generally produced during the process of non-cyclic phosphorylation by photosystem I (PS I).
So, the correct answer is 'Photosystem I'.
Question 8
1 / -0

The corc metal of chlorophyll is

A
Ni

B
Cu

C
Fe

D
Mg

Solution

The chlorophyll molecule is made up of porphyrin ring which is a structure that has alternating single and double bonds and contains four small pyrrole rings. It has a magnesium atom at the centre.
So, the correct answer is 'Mg'
Question 9
1 / -0

The enzymes involved in primary $$CO_2$$ fixation in $$C_4$$ plants is _____ and located in ______.

A
PEPCase, agranal chloroplast

B
RuBisCO, granal chloroplast

C
PEPCase, cytosol of mesophyll cells

D
PEPCase, granal chloroplast

Solution

In C$$_4$$ plants after entering through stomata, CO$$_2$$ diffuses into a mesophyll cell. Being close to the leaf surface, these cells are exposed to high levels of O$$_2$$, but have no RUBISCO so cannot start photorespiration (nor the dark reactions of the Calvin cycle). Instead, the CO$$_2$$ is inserted into a 3-carbon compound called phosphoenolpyruvic acid (PEP) forming the 4-carbon compound oxaloacetic acid. This takes place with the help of enzyme phosphoenolpyruvate carboxylase (PEP carboxylase).
So, the correct option is 'PEPCase, cytosol of mesophyll cells'.
Question 10
1 / -0

The reaction that is responsible for the primary fixation of $$CO_{2}$$ is catalysed by

A
$$RuBP$$ carboxylase

B
$$PEP$$ carboxylase

C
$$RuBP$$ carboxylase and $$PEP$$ carboxylase

D
$$PGA$$ synthase

Solution

Carboxylation is the reaction responsible for the primary fixation of carbon dioxide. This reaction is catalysed by the RuBP carboxylase which results in the formation of 2 molecules of 3-PGA.

So, the correct option is 'RuBP carboxylase' .

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Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 64

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Photosynthesis in Higher Plants Test - 64

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SHARING IS CARING

Question 1

store carbon dioxide temporarily as oxaloacetate

are found in hot dry climates

have a net photosynthetic rate two to three times that of $$C_3$$ plants

all of the above

Solution

Question 2

cytoplasm

chloroplasts

mitochondria

ribosomes

Solution

Question 3

cytoplasm

stroma

plasma membrane

grana

Solution

Question 4

light is available

light is not available

carbon dioxide is attached to RuBP

electrons leave a photosystem

Solution

Question 5

the Calvin cycle

photosystem-l

photosystem-Il

the light reactions

Solution

Question 6

respiration

transpiration

photosynthesis

digestion

Solution

Question 7

Photosystem II

Anaerobic respiration

Glycolysis

Photosystem I

Solution

Question 8

Ni

Cu

Fe

Mg

Solution

Question 9

PEPCase, agranal chloroplast

RuBisCO, granal chloroplast

PEPCase, cytosol of mesophyll cells

PEPCase, granal chloroplast

Solution

Question 10

$$RuBP$$ carboxylase

$$PEP$$ carboxylase

$$RuBP$$ carboxylase and $$PEP$$ carboxylase

$$PGA$$ synthase

Solution

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