Structure of Chloroplasts

Q.

Write a short note on grana and stroma.

Q. Consider the following five statements (A to E) with respect to the chloroplast shown below. Select the correct option stating which ones are True (T) and which ones are False (F).



A. It is selectively permeable and lack porins.
B. Stacked thylakoids one over other which is the site of production of assimilatory power.
C. and D. Present between two grana and contain enzymes of dark reaction.
E. It contains enzymes for the synthesis of sugar and proteins.

1. A-F B-T C-T D-T E-T
2. A-F B-T C-F D-F E-T
3. A-T B-T C-F D-F E-T
4. A-T B-F C-T D-T E-T

Q.

Name one colourless plastid.

Q. Identify the structures present in the following image.

1. (i)-inner membrane, (ii)-lumen, (iii)-thylakoid, (iv)-oxysomes
2. (i)-outer membrane, (ii)-stroma, (iii)-thylakoid, (iv)-granum
3. (i)-inner membrane, (ii)-intermembrane space, (iii)-thylakoid, (iv)-oxysomes
4. (i)-outer membrane, (ii)-lumen, (iii)-thylakoid, (iv)-stromal lamella

Q. Chlorophyll pigments are present in the

1. stroma
2. thylakoids
3. outer membrane of chloroplast
4. inner membrane of chloroplast

Q. Select the wrong statement from the following:

1. The chloroplasts are generally much larger than mitochondria
2. Both chloroplasts and mitochondria contain an inner and an outer membrane
3. Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
4. Both chloroplasts and mitochondria contain DNA

Q. Assertion (A): Mitochondria and chloroplasts are semi-autonomous organelles.
Reason (R): They are formed by the division of pre-existing organelles, and also contain DNA but lack protein synthesising machinery.

1. Both A and R are correct and R is the correctexplanation of A
2. Both A and are correct, but R is not the correctexplanation of A
3. A is correct, but R is incorrect
4. Both A and R are incorrect