General
✓✗The cell envelope of most bacteria, from outside to inside, consists of
- capsule, plasma membrane and cell wall
- glycocalyx, cell wall and plasma membrane
- cell wall, glycocalyx and plasma membrane
- plasma membrane, cell wall and glycocalyx
General
✓✗The centrosome is an organelle usually containing
- one large nucleolus
- stacked thylakoids
- two cylindrical centrioles
- many ribosomes
General
✓✗The rough ER is frequently observed in cells that are actively involved in
- photosynthesis
- nuclear division only
- lipid storage only
- protein synthesis and secretion
General
✓✗The structures formed by stacking of organised flattened membranous sacs in the chloroplasts are
- grana
- cristae
- stroma lamellae
- stroma
General
✓✗Which type of leucoplast stores starch, as in potato?
- Aleuroplast
- Elaioplast
- Amyloplast
- Chromoplast
General
✓✗Identify the components labelled A, B, C and D in the diagram from the list (i) to (viii) given below.
(i) Cristae of mitochondria
(ii) Inner membrane of mitochondria
(iii) Cytoplasm
(iv) Smooth endoplasmic reticulum
(v) Rough endoplasmic reticulum
(vi) Mitochondrial matrix
(vii) Cell vacuole
(viii) Nucleus
The correct components are
(i) Cristae of mitochondria
(ii) Inner membrane of mitochondria
(iii) Cytoplasm
(iv) Smooth endoplasmic reticulum
(v) Rough endoplasmic reticulum
(vi) Mitochondrial matrix
(vii) Cell vacuole
(viii) Nucleus
The correct components are
- A-(v), B-(iv), C-(viii), D-(iii)
- A-(vi), B-(v), C-(iv), D-(vii)
- A-(i), B-(iv), C-(viii), D-(vi)
- A-(v), B-(i), C-(iii), D-(ii)
General
✓✗Which of the following pairs of organelles does not contain DNA?
- Chloroplasts and vacuoles
- Nuclear envelope and mitochondria
- Lysosomes and vacuoles
- Mitochondria and lysosomes
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In prokaryotic cells, respiration does not take place in mitochondria.
Reason (R): Prokaryotic cells lack membrane-bound organelles.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): In prokaryotic cells, respiration does not take place in mitochondria.
Reason (R): Prokaryotic cells lack membrane-bound organelles.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗The ribosomes of the chloroplast are
- 70S, smaller than the 80S cytoplasmic ribosomes
- identical to cytoplasmic ribosomes
- absent
- 80S, larger than the cytoplasmic ribosomes
General
✓✗Match the following and select the correct answer.
Select the correct option.
| Column I | Column II |
| P. Centriole | (i) Infoldings in mitochondria |
| Q. Chlorophyll | (ii) Thylakoids |
| R. Cristae | (iii) Nucleic acids |
| S. Ribozymes | (iv) Basal body of cilia or flagella |
- P-(i), Q-(ii), R-(iv), S-(iii)
- P-(iv), Q-(iii), R-(i), S-(ii)
- P-(iv), Q-(ii), R-(i), S-(iii)
- P-(i), Q-(iii), R-(ii), S-(iv)
General
✓✗The centromere holds together the two
- membranes of the nucleus
- centrioles of the centrosome
- chromatids of a chromosome
- subunits of a ribosome
General
✓✗The plasma membrane consists mainly of
- proteins embedded in a phospholipid bilayer
- phospholipids embedded in a protein bilayer
- proteins embedded in a polymer of glucose molecules
- proteins embedded in a carbohydrate bilayer
General
✓✗Given below are two statements.
Statement I: The outer membrane of the nuclear envelope usually remains continuous with the endoplasmic reticulum and bears ribosomes.
Statement II: Nuclear pores are formed by the fusion of the two membranes of the nuclear envelope.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: The outer membrane of the nuclear envelope usually remains continuous with the endoplasmic reticulum and bears ribosomes.
Statement II: Nuclear pores are formed by the fusion of the two membranes of the nuclear envelope.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are correct.
- Both Statement I and Statement II are incorrect.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
General
✓✗In plants, the layer that holds or glues neighbouring cells together is the
- plasma membrane
- tonoplast
- middle lamella
- secondary wall
General
✓✗The inner compartment of the mitochondrion is filled with a dense homogeneous substance called the
- nucleoplasm
- stroma
- cytosol
- matrix