Photosynthesis in Higher Plants Test

Result

Photosynthesis in Higher Plants Test - 54

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

Identify the correct statement(s) in relation to photosynthesis.
(a) First $$CO_2$$ acceptor in $$C_4$$ cycle is PGA.
(b) In $$C_3$$ plants, the first stable product of photosynthesis in RuBP.
(c) Cyclic photophosphorylation results in the formation of ATP.
(d) Oxygen liberated during photosynthesis comes from water.

A
a and b alone are correct

B
a and c alone are correct

C
c and d alone are correct

D
b and c alone are correct

Solution

A) 'a' is incorrect as the first $${ CO }_{ 2 }$$ acceptor in $${ C}_{ 4 } $$ cycle is PEPcase. 'b' is incorrect as the first stable product of
photosynthesis in $${ C}_{ 3 }$$ plants is PGA.
B) 'a' is incorrect as the first $${ CO }_{ 2 }$$ acceptor in $${ C}_{ 4 }$$ cycle is PEPcase. 'c' is correct as cyclic photophosphorylation results in the formation of the only ATP.
C) 'c' is correct as cyclic photophosphorylation results in the formation of the only ATP. 'd' is correct as oxygen is evolved from the photolysis of water.
D) 'b' is incorrect as the first stable product of photosynthesis in $${ C}_{ 3 }$$ plants is PGA. 'c' is correct as cyclic photophosphorylation results in the formation of the only ATP.
So the correct answer is 'c and d alone are correct'.
Question 2
1 / -0

Which of the following statement is correct?

A
$$C_4$$ plants are more efficient than $$C_3$$ plants

B
$$C_3$$ plants are more efficient than $$C_4$$ plants

C
Photorespiration is useful process

D
Photorespiration is absent in $$C_3$$ plants

Solution

A) $${ C }_{ 4 }$$ plants are more efficient than $${ C }_{ 3 }$$ plants as they do not undergo photorespiration. So, the carbon dioxide liberated is recycled back to PEP and is reused in $${ C }_{ 4 }$$ cycle.
B) $${ C }_{ 3 }$$ plants are less efficient than $${ C }_{ 4 }$$ plants as they undergo photorespiratory losses as they lose carbon dioxide which is not recycled, whereas $${ C }_{ 4 }$$ plants reuse the carbon dioxide.
C) Photorespiration is a wasteful process because it prevents plants from using their ATP and NADPH to synthesise carbohydrates. $${ C }_{ 3 }$$ plants use this energy to regenerate carbon dioxide instead of recycling it.
D) Photorespiration takes place in $${ C }_{ 3 }$$ plants whereas it is absent in $${ C }_{ 4 }$$ plants.
So the correct answer is '$${ C }_{ 4 }$$ plants are more efficient than $${ C }_{ 3 }$$ plants'.
Question 3
1 / -0

In overall process of photosynthesis, the number of $$CO_2$$, water, sugar and $$O_2$$ molecules utilised and produced

A
12

B
13

C
19

D
31

Solution

A) To produce one molecule of sugar, totally 6 molecules of $${ CO }_{ 2 }$$ and 12 molecules of water are required.
B) 18 molecules are consumed and 13 molecules are produced.
C) For 1 glucose (sugar) molecule, 6 molecules of $${ CO }_{ 2 }$$, 12 molecules of water are required. The total number of molecules involved is 6 + 12 + 1 + 6 + 6 = 31.
D) Hence, 31 molecules are involved in the overall process of photosynthesis.
So the correct answer is '31'.
Question 4
1 / -0

In $$C_4$$ plants, bundle sheath cells have

A
Thin wall for gaseous exchange

B
Rich PEP carboxylase

C
High density of chloroplasts

D
Large intercellular spaces

Solution

A) Bundle sheath cells have thick walls to prevent gaseous exchange.
B) Mesophyll cells have PEP carboxylase while bundle sheath cells have RuBisCO.
C) Bundle sheath cells have a large number of chloroplasts.
D) They do not have any intercellular spaces.
So the correct answer is 'High density of chloroplasts'.
Question 5
1 / -0

Which is incorrect regarding C$$_4$$ pathway?

A
The primary $$CO_2$$ acceptor is PEP

B
Bundle sheath cells contain PEPcase

C
Enzyme for $$CO_2$$ fixation is PEPcase

D
Mesophyll cells lack RuBisCO

Solution

A) The primary acceptor of carbon dioxide is PEPcase which is present in the mesophyll cells.
B) Bundle sheath cells contain RuBisCO while mesophyll cells contain PEPcase.
C) PEPcase fixes carbon dioxide in the mesophyll cells.
D) Mesophyll cells lack RuBisCO. It is present in bundle sheath cells.
So the correct answer is 'Bundle sheath cells contain PEPcase'.
Question 6
1 / -0

Bundle sheath cells

A
Lack RuBisCO

B
Lack both RuBisCO and PEP carboxylase

C
Are rich in RuBisCO

D
Are rich in PEP carboxylase

Solution

A) Bundle sheath cells are rich in RuBisCO.
B) Mesophyll cells lack RuBisCO and Bundle sheath cells are rich in RuBisCO and lack PEP carboxylase.
C) Bundle sheath cells are rich in RuBisCO and lack PEP carboxylase.
D) Mesophyll cells are rich in PEP carboxylase.
So the correct answer is 'Are rich in RuBisCO'.
Question 7
1 / -0

Chemiosmotic hypothesis of ATP synthesis in chloroplasts is based on

A
Accumulation of $$K^+$$ ions

B
Proton gradient

C
Accumulation of Na ions

D
Membrane potential

E
Increase in pH of lumen

Solution

The chemiosmotic hypothesis of ATP synthesis in chloroplasts is based on proton gradient. The chemiosmotic hypothesis was explained by P. Mitchell. ATP synthesis is linked to the development of a proton gradient across the membrane of the thylakoid of chloroplast and proton accumulation is towards the inside of the membrane i.e. in the lumen. Source of protons within the chloroplasts is water. The splitting of water molecule takes place on the inner side of the membrane and so the protons (hydrogen ions) are produced, they accumulate within the lumen of the thylakoids.
Question 8
1 / -0

The form of carbon used for carboxylation of phosphoenol pyruvate in $$C_4$$ plants is

A
$$H_2CO_3$$

B
$$C_2H_4$$

C
$$CH_4$$

D
$$HCO_3^-$$.

Solution

A) The ionised form of $$H_{ 2 }{ CO }_{ 3 }$$ is used. It cannot be used directly.
B) Ethane is not used in the carboxylation of phosphoenolpyruvate.
C) Methane is not used in the carboxylation of phosphoenolpyruvate.
D) $${ HCO }_{ 3 }^{ - }$$ is used for the carboxylation of phosphoenol pyruvate in $${ C }_{ 4 }$$ plants.
So the correct answer is '$${ HCO }_{ 3 }^{ - }$$'.
Question 9
1 / -0

Identify the correct statement(s) in relation to $$C_4$$ photosynthesis.
(a) Kranz anatomy is an essential feature for $$C_4$$ plants.
(b) $$C_4$$ plants have higher water use efficiency than $$C_3$$ plants.
(c) Photorespiration is minimised in $$C_4$$ pathway.
(d) Conversion of oxaloacetate to malate occurs in bundle sheath cells.

A
a and b

B
a, b and c

C
b and c

D
b, c and d.

Solution

A) Kranz anatomy is an essential feature of $${ C }_{ 4 }$$ plants as it enables the Hatch and Slack pathway. So, 'a' is correct. $${ C }_{ 4 }$$ plants have improved leaf and plant water use efficiency. So, 'b' is correct.
B) 'a' and 'b' are correct. Photorespiration is overcome in $${ C }_{ 4 }$$ plants. So, 'c' is correct.
C) 'a' is correct in addition to 'b' and 'c'.
D) 'd' is incorrect as conversion of oxaloacetate to malate occurs in mesophyll cells.
So the correct answer is 'a, b and c'.
Question 10
1 / -0

Statement a. Photorespiration decreases photosynthetic output.
Statement b. In photorespiratory pathway, neither ATP nor NADPH is produced

A
Both the statements a and b are correct.

B
Both the statements a and b are wrong.

C
Statement a is correct and statement b is wrong.

D
Statement b is correct and statement a is wrong.

Solution

Photorespiration is a process which involves loss of fixed carbon as $$CO_{2}$$ in plants in the presence of light. It is initiated in chloroplasts. This process does not produce ATP or NADPH and is a wasteful process. Photo-respiratory reactions are operated in chloroplasts, mitochondria, and peroxisomes. Loss of $$CO_{2}$$ occurs in mitochondria. Photorespiration occurs usually when there is the high concentration of oxygen. Under such circumstances, RuBisCO, the enzyme that catalyzes the carboxylation of RuBP during the first step of Calvin cycle, functions as an oxygenase. Some $$O_{2}$$ does not bind to RuBisCO and hence $$CO_{2}$$ fixation is decreased. The RuBP binds with $$O_{2}$$ to form one molecule of PGA (3C compound) and phosphoglycolate (2C compound) in the pathway of photorespiration. Rather, it results in the release of $$CO_{2}$$ with the utilization of ATP. It leads to a 25 percent loss of the fixed $$CO_{2}$$. $$O_{2}$$ is first utilized in chloroplasts and then in peroxisomes. It decreases photosynthetic output.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Photosynthesis in Higher Plants Test - 54

Result

Photosynthesis in Higher Plants Test - 54

Score

-

Rank

-

SHARING IS CARING

Question 1

a and b alone are correct

a and c alone are correct

c and d alone are correct

b and c alone are correct

Solution

Question 2

$$C_4$$ plants are more efficient than $$C_3$$ plants

$$C_3$$ plants are more efficient than $$C_4$$ plants

Photorespiration is useful process

Photorespiration is absent in $$C_3$$ plants

Solution

Question 3

12

13

19

31

Solution

Question 4

Thin wall for gaseous exchange

Rich PEP carboxylase

High density of chloroplasts

Large intercellular spaces

Solution

Question 5

The primary $$CO_2$$ acceptor is PEP

Bundle sheath cells contain PEPcase

Enzyme for $$CO_2$$ fixation is PEPcase

Mesophyll cells lack RuBisCO

Solution

Question 6

Lack RuBisCO

Lack both RuBisCO and PEP carboxylase

Are rich in RuBisCO

Are rich in PEP carboxylase

Solution

Question 7

Accumulation of $$K^+$$ ions

Proton gradient

Accumulation of Na ions

Membrane potential

Increase in pH of lumen

Solution

Question 8

$$H_2CO_3$$

$$C_2H_4$$

$$CH_4$$

$$HCO_3^-$$.

Solution

Question 9

a and b

a, b and c

b and c

b, c and d.

Solution

Question 10

Both the statements a and b are correct.

Both the statements a and b are wrong.

Statement a is correct and statement b is wrong.

Statement b is correct and statement a is wrong.

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.