Photosynthesis in Higher Plants Test

Result

Photosynthesis in Higher Plants Test - 75

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

For the synthesis of one glucose molecule, the number of ATP required are

A
9 ATP for $${C_3}$$ cycle and 20 ATP for $${C_4}$$ cycle.

B
18 ATP for $${C_3}$$ cycle and 30 ATP for $${C_4}$$ cycle.

C
22 ATP for $${C_3}$$ cycle and 35 ATP for $${C_4}$$ cycle.

D
24 ATP for $${C_3}$$ cycle and 36 ATP for $${C_4}$$ cycle.

Solution

Since every $$CO_2$$ molecule has to be fixed twice, first by 4-carbon organic acid and second by RuBisCO, the $$C_4$$ pathway uses more energy than the $$C_3$$ pathway. The $$C_3$$ pathway requires 18 molecules of ATP for the synthesis of one molecule of glucose, whereas the $$C_4$$ pathway requires 30 molecules of ATP.
This energy debt is more than paid for by avoiding losing more than half of photosynthetic carbon in photorespiration as occurs in some tropical plants, making it an adaptive mechanism for minimizing the loss.
Question 2
1 / -0

Photosynthesis consists of essentially two biological reaction systems, one followed by the other. The second of these systems do which of the following?

A
Fixes $$CO_{2}$$

B
Traps light energy

C
synthesizes starch

D
Works only in the presence of light
Solution
- The photosynthesis is consists of two biological reaction systems are light dependent and light independent reactions. The CO$$_2$$ is fixed in this system.
- The plant uses light energy to generate NADPH and ATP. The chemical bonds in these compounds store the energy and are used during the light independent phase.
- The light independent phasen the ATP and NADPH generated in the light phase utilised to make C-C bonds of carbohydrates from carbon dioxide and water, with the RuBP.
- Six molecules of carbon dioxide enter the cycle, which in turn produces one molecule of glucose or sugar.
So, the correct answer is option A.
Question 3
1 / -0

Choose the correct statement from the following.

A
Chl a is blue green pigment with formula $${C_{55}H_{70} O_6 N_4 Mg}$$

B
Chl a is blue green pigment with formula $${C_{55}H_{72} O_5 N_4 Mg}$$

C
Chl b is yellow green pigment with formula $${C_{55}H_{70} O_5 N_4 Mg}$$

D
Xanthin is a pigment with formula $${C_{40}H_{60}}$$

Solution

Chlorophyll a is a blue green pigment with molecular formula : $${C_{55}H_{72} O_5 N_4 Mg}$$.
Chlorophyll B is a yellow green pigment with molecular formula : $$C_{55}H_{70}MgN_{4}O_{6}$$.
Xanthin is a pigment with molecular formula : $$C_{5}H_{4}N_{4}O_{2}$$.
So, the correct answer is option B.
Question 4
1 / -0

As compared to a $${C_3}$$-plants how many additional molecules of ATP are needed for net production of one molecule of a hexose sugar by $${C_4}$$-plants

A
2

B
6

C
0

D
12

Solution

Every CO₂ molecule has to be fixed twice, first by 4-carbon organic acid and second by RuBisCO, the C₄ pathway uses more energy than the C₃ pathway. The C₃ pathway requires 18 molecules of ATP for the synthesis of one molecule of glucose, whereas the C₄ pathway requires 30 molecules of ATP. This energy debt of more 12 ATPs is more than paid for by avoiding losing more than half of photosynthetic carbon in photorespiration as occurs in some tropical plants, making it an adaptive mechanism for minimising the loss.
So, the correct answer is option D.
Question 5
1 / -0

In Panicum maximum and Chloris gayana the $${C_4}$$ pathway is ........... type.

A
PEP-CK

B
$${NADP\pm Me}$$

C
$${NAD\pm Me}$$

D
All of the above

Solution

There is three variation of the basic $$C_4$$ pathway, which principally differ in the $$C_4$$ acid transported into the bundle sheath cells (malate or aspartate) and in the manner of decarboxylation.
The enzyme that catalyzes decarboxylation in bundle-sheath cells differs. In maize and sugarcane, the enzyme is NADP-malic enzyme; in millet, it is a NAD-malic enzyme and, in Panicum maximum and Chloris gayana, it is PEP carboxykinase.
So, the correct answer is option A.
Question 6
1 / -0

Choose the correct statement from the following.

A
The $${C _4}$$ plants do not have Rubisco

B
Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate

C
Carboxylation of phosphoenol pyruvate results in formation of malate

D
Decarboxylation of $${C_4}$$ acids occurs in the bundle sheath cells

E
In CAM plants Calvin's cycle reactions occur during night

Solution

In these bundle-sheath cells, RuBisCO is isolated from atmospheric oxygen and saturated with the CO$$_2$$ released by decarboxylation of the malate or oxaloacetate. These additional steps, however, require more energy in the form of ATP. The C$$_4$$ plants have Rubisco. Carboxylation of RuBP leads to the formation of 2 molecules of phosphoglycolates. Carboxylation of phosphoenolpyruvate results in the formation of oxaloacetate. Decarboxylation of C$$_4$$ acids occurs in the mesophyll cells. In CAM plants Calvin's cycle reactions occur during day time.
So, the correct answer is option D.
Question 7
1 / -0

85 - 90% of the photosynthesis is carried out by

A
Herbs

B
Shrubs

C
Trees

D
Algae of oceans

Solution

Photosynthesis takes place sequentially in several steps. There is an evolutionary inheritance of red and green plastids in eukaryotic algae, which makes algae of oceans 85 - 90% of photosynthetic efficiency. So, the correct answer is option D.
Question 8
1 / -0

In the following dark reaction of photosynthesis, $${6CO_2+6 H_2 O +A+12 NADPH +H\rightarrow C_6H_{12}O_6+6O_2+B+18 NADP}$$ , A and B stand for

A
18 ADP, 18 ATP

B
12 ATP, 18 ATP

C
18 ATP, 18 ADP

D
12 ATP, 12 ADP

Solution

In dark reaction of photosynthesis, 18 ATP molecules and 12 $$NADPH_2$$ molecules are utilized, which are produced during light reactions. Thus, A and B are 18 ATP and 18 ADP respectively.
Question 9
1 / -0

Chlorophyll a is absent in which of the following photosynthesising organisms?

A
Bacteria

B
Cyanobacteria

C
Red algae

D
Brown algae

Solution

The main light-harvesting pigment in bacteria is not chlorophyll, but bacteriochlorophyll (BChl), a closely related magnesium porphyrin, that has a more saturated tetrapyrrole ring. This causes BChl to absorb at significantly longer wavelengths than chlorophyll in the near infrared, the absorbance spectrum being dictated by the details of the conjugated electron system of the macrocycle.
So, the correct answer is option A.
Question 10
1 / -0

The accepted size of chlorophyll molecule is

A
Head - $$15\, \times\, 10 A^\circ$$ and Tail - $$25 A^\circ$$

B
Head - $$20\, \times\, 20 A^\circ$$ and Tail - $$25 A^\circ$$

C
Head - $$10\, \times\, 10 A^\circ$$ and Tail - $$15 A^\circ$$

D
Head - $$15\, \times\, 15 A^\circ$$ and Tail - $$20 A^\circ$$

Solution

Chlorophyll molecules are distinguished into a head of size 15 x 15 angstrom and a tail of 20-angstrom length. The head is made up of porphyrin, a cyclic tetrapyrrole closed ring derivative and the tail of phytol ($$C_{20}H_{39}OH$$). There is a fifth isocyclic ring of cyclopentanone. A nonionic magnesium atom is held within tetrapyrrole ring by two covalent and two co-ordinate bonds.
So, the correct answer is option D.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 75

Result

Photosynthesis in Higher Plants Test - 75

Score

-

Rank

-

SHARING IS CARING

Question 1

9 ATP for $${C_3}$$ cycle and 20 ATP for $${C_4}$$ cycle.

18 ATP for $${C_3}$$ cycle and 30 ATP for $${C_4}$$ cycle.

22 ATP for $${C_3}$$ cycle and 35 ATP for $${C_4}$$ cycle.

24 ATP for $${C_3}$$ cycle and 36 ATP for $${C_4}$$ cycle.

Solution

Question 2

Fixes $$CO_{2}$$

Traps light energy

synthesizes starch

Works only in the presence of light

Solution

Question 3

Chl a is blue green pigment with formula $${C_{55}H_{70} O_6 N_4 Mg}$$

Chl a is blue green pigment with formula $${C_{55}H_{72} O_5 N_4 Mg}$$

Chl b is yellow green pigment with formula $${C_{55}H_{70} O_5 N_4 Mg}$$

Xanthin is a pigment with formula $${C_{40}H_{60}}$$

Solution

Question 4

2

6

0

12

Solution

Question 5

PEP-CK

$${NADP\pm Me}$$

$${NAD\pm Me}$$

All of the above

Solution

Question 6

The $${C _4}$$ plants do not have Rubisco

Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate

Carboxylation of phosphoenol pyruvate results in formation of malate

Decarboxylation of $${C_4}$$ acids occurs in the bundle sheath cells

In CAM plants Calvin's cycle reactions occur during night

Solution

Question 7

Herbs

Shrubs

Trees

Algae of oceans

Solution

Question 8

18 ADP, 18 ATP

12 ATP, 18 ATP

18 ATP, 18 ADP

12 ATP, 12 ADP

Solution

Question 9

Bacteria

Cyanobacteria

Red algae

Brown algae

Solution

Question 10

Head - $$15\, \times\, 10 A^\circ$$ and Tail - $$25 A^\circ$$

Head - $$20\, \times\, 20 A^\circ$$ and Tail - $$25 A^\circ$$

Head - $$10\, \times\, 10 A^\circ$$ and Tail - $$15 A^\circ$$

Head - $$15\, \times\, 15 A^\circ$$ and Tail - $$20 A^\circ$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.