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Chloroplast and Photosynthesis - Class XII

Questions covering chloroplast structure, photosynthetic pigments (PS I and PS II), thylakoid membranes, Calvin cycle, and related photosynthetic processes in plants

14 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Amount of $ C{ O} _{ 2 } $ mixed  annually is about 

  1. $70\times 1{ 0 }^{10 } Kg $
  2. $ 70\times 1{ 0 }^{11 } Kg$
  3. $ 70\times 1{ 0 }^{13 } Kg $
  4. $ 70\times 1{ 0 }^{13 } g $
Question 2 Multiple Choice (Single Answer)
In PS I, the reaction centre Chl a has absorption maxima at ________; whereas in PS II, the reaction centre Chl a has absorption maxima at _________. 
  1. 700 nm, 680nm
  2. 680 nm, 700nm
  3. 400 nm, 500 nm
  4. 700 nm, 800 nm
Question 3 Multiple Choice (Single Answer)
For NADPH + $ H^{+}$ formation 
  1. only PS I is required
  2. only PS II is required
  3. both PS I and PS II are required
  4. only stroma is required
Question 4 Multiple Choice (Single Answer)

How many of the given structures are associated with the thylakoid membrane?
PS II, RuBisCO, LHC, PEPcase, $F _0$ of ATP synthase, cytochromes b & f.

  1. $2$
  2. $3$
  3. $4$
  4. $5$
Question 5 Multiple Choice (Single Answer)

Read the following statements.
i) Chloroplasts get aligned with their flat surface parallel to the cell walls to receive optimum light intensity.
ii) Water is the only electron donor in all photosynthetic organisms.
iii) ATP and NADPH are utilised in Carboxylation stage of Calvin cycle.
iv) Bundle sheath cells are characterized by having a large number of chloroplasts and impervious walls.
v) Law of limiting factors was proposed by Blackmann.
Which of the given statements are CORRECT?

  1. (i), (iii) and (iv)
  2. (i), (ii) and (iii)
  3. (iii), (iv) and (v)
  4. (v) only
Question 6 Multiple Choice (Single Answer)

Which cellular part is correctly described

  1. Thylakoids - Flattened membranous sacs forming grana
  2. Centrioles - Sites for active RNA synthesis
  3. Ribosomes - Those in chloroplasts are larger (80 S) while those in cytoplasm are smaller (70 S)
  4. Lysosomes - Opimally active at 8.5 pH.
Question 7 Multiple Choice (Single Answer)

The spaces inside the folds of ER membrane are known as

  1. Thylakoids
  2. Cisternae
  3. Mesosomes
  4. Periplasmic space
Question 8 Multiple Choice (Single Answer)

Match the following

a. Bacteria 1. Synthesis and storage of lipids
b. Sphaerosomes 2. Idiogram
c. Chloroplasts 3. Glycocalyx
d. Karyotype 4. Thylakoids
  1. a-3, b-1, c-4, d-2
  2. a-3, b-1, c-2, d-4
  3. a-4, b-3, c-2, d-1
  4. a-1, b-2, c-3, d-4
  5. a-3, b-2, c-4, d-1.
Question 9 Multiple Choice (Single Answer)

Consider the following processes.
a. $O _2$ evolution
b. $CO _2$ fixation
c. NADPH formation
d. Chlorophyll biosynthesis.
Which of these do not occur in thylakoids?

  1. $1$ and $2$
  2. $2$ and $3$
  3. $3$ and $4$
  4. $2$ and $4$
Question 10 Multiple Choice (Single Answer)

If $^{14}CO _2$ is added to a suspension of photosynthesizing chloroplasts, which of the following will be the first compound to be radioactive?

  1. ATP
  2. NADPH
  3. NADH
  4. $3$-phosphor glycerate
Question 11 Multiple Choice (Single Answer)

Which one of the following options is true in photsynthesis.

  1. $CO _2$ is oxidized and $ H _2O $ is reduced
  2. $H _2O $is oxidized and $CO _2 is reduce d$
  3. Both $CO _2$ and $H _2O$ are reducedd
  4. Both $CO2$ and$ H2O$ are oxidized
Question 12 Multiple Choice (Single Answer)

With reference to photosynthesis in chloroplasts, consider the following statements.
a. The reactions that break down water and produce oxygen are located on the lumen side of the thylakoid membrane, in granum areas.
b. The molecules of ferredoxin-NADP re-educate that generate NADPH are located on the side of the membrane facing stroma.
Which of the statements given is/are correct?

  1. $1$ only
  2. $2$ only
  3. Both $1$ and $2$
  4. Neither $1$ nor $2$
Question 13 Multiple Choice (Single Answer)

Why does the total amount of $CO _2$ in the atmosphere remains constant even though respiration liberates $CO _2$?

  1. $CO _2$ acts as a buffer
  2. $CO _2$ is converted to carbohydrates in photosynthesis
  3. $CO _2$ forms carbonic acid
  4. $CO _2$ undergoes cleavage during photosynthesis.
Question 14 Multiple Choice (Single Answer)

Thylakoids are found in 

  1. bacteria
  2. blue green algae
  3. higher plants
  4. all of these
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