NEET MCQs Practice on Cell : The Unit of Life Class-XI Biology, Free unlimited practice on Cell : The Unit of Life Class-XI Biology Mcqs

Question 71 of 100

📘 CLASS XI

Consider statements regarding cell wall in young vs mature plant cells:

I. Primary wall of young plant cell is capable of growth.
II. Growth capability of primary wall diminishes as cell matures.
III. Secondary wall is formed on the inner side towards the plasma membrane.
IV. Secondary wall is formed outside the primary wall towards the middle lamella.

Which options are correct?

The primary cell wall is capable of growth, which diminishes as the cell matures. The secondary wall is deposited on the inner side of the primary wall towards the plasma membrane. Statement IV is incorrect.

Question 72 of 100

📘 CLASS XI

Read statements regarding plasmodesmata:

I. Traverse the cell wall and middle lamella.
II. Connect the cytoplasm of neighbouring cells.
III. Membrane-bound organelles inside mitochondria.
IV. Formed by centrioles during mitosis.

Which statements are correct?

Plasmodesmata traverse the cell wall and middle lamella, establishing cytoplasmic continuity between neighbouring plant cells. Statements III and IV are incorrect because plasmodesmata are neither mitochondrial organelles nor products of centrioles.

Question 73 of 100

📘 CLASS XI

Select the correct statements regarding endoplasmic reticulum compartments:

I. ER divides intracellular space into two compartments.
II. Luminal compartment is inside ER.
III. Extra-luminal compartment is cytoplasm.
IV. Luminal compartment includes nuclear matrix.

Which statements are correct?

The endoplasmic reticulum divides the intracellular space into luminal (inside the ER) and extra-luminal (cytoplasmic) compartments. Statement IV is incorrect because the nuclear matrix is not part of the ER lumen.

Question 74 of 100

📘 CLASS XI

Consider statements regarding RER vs SER:

I. RER bears ribosomes on its surface.
II. RER is active in protein synthesis and secretion.
III. SER lacks ribosomes and synthesizes lipids.
IV. SER is continuous with the outer nuclear membrane.

Which statements are correct?

Rough endoplasmic reticulum bears ribosomes and is involved in protein synthesis and secretion. Smooth endoplasmic reticulum lacks ribosomes and synthesizes lipids. Statement IV is incorrect because the RER, not SER, is continuous with the outer nuclear membrane.

Question 75 of 100

📘 CLASS XI

Read statements regarding Golgi cisternae orientation:

I. Concentrically arranged near the nucleus.
II. Convex cis face is the forming face.
III. Concave trans face is the maturing face.
IV. Cis face faces the plasma membrane while trans face faces the nucleus.

Which option is correct?

Golgi cisternae are concentrically arranged near the nucleus. The convex cis face is the forming face and the concave trans face is the maturing face. Statement IV is incorrect because the cis face is oriented towards the nucleus and receives ER vesicles.

Question 76 of 100

📘 CLASS XI

Consider statements regarding lysosomal hydrolases:

I. Lipases digest lipids.
II. Proteases digest proteins.
III. Carbohydrases digest carbohydrates.
IV. Hydrolases are active at basic pH 8.5.

Which statements are correct?

Lysosomes contain hydrolytic enzymes such as lipases, proteases, and carbohydrases that digest lipids, proteins, and carbohydrates. Statement IV is incorrect because these enzymes function optimally in an acidic pH.

Question 77 of 100

📘 CLASS XI

Which statements about contractile and food vacuoles are correct?

I. Contractile vacuole in Amoeba functions in osmoregulation and excretion.
II. Food vacuoles form by engulfing food particles in protists.
III. Contractile vacuoles store starch in potato cells.
IV. Food vacuoles are double membrane-bound genetic reservoirs.

Which statements are correct?

Contractile vacuoles in Amoeba perform osmoregulation and excretion, while food vacuoles are formed by engulfing food particles. Statements III and IV are incorrect because contractile vacuoles do not store starch and food vacuoles are neither double membrane-bound nor genetic reservoirs.

Question 78 of 100

📘 CLASS XI

Read statements regarding mitochondria dimensions:

I. Sausage-shaped or cylindrical.
II. Diameter ranges from 0.2 to 1.0 μm (average 0.5 μm).
III. Length ranges from 1.0 to 4.1 μm.
IV. Easily visible under microscope without staining.

Which statement combination is correct?

Mitochondria are sausage-shaped or cylindrical, with a diameter of about 0.2 to 1.0 μm and a length of about 1.0 to 4.1 μm. Statement IV is incorrect because mitochondria are generally not visible without specific staining.

Question 79 of 100

📘 CLASS XI

Select the correct statements about mitochondrial energy production:

I. Sites of aerobic respiration.
II. Produce ATP (power houses of the cell).
III. Matrix contains enzymes for the TCA cycle.
IV. Divide by budding.

Which statements are correct?

Mitochondria are the sites of aerobic respiration and ATP production. The matrix contains enzymes of the TCA cycle. Statement IV is incorrect because mitochondria divide by fission, not budding.

Question 80 of 100

📘 CLASS XI

Consider statements regarding chloroplast vs chromoplast pigments:

I. Chloroplasts contain chlorophyll and carotenoids.
II. Chromoplasts contain carotene and xanthophylls.
III. Chromoplasts impart yellow, orange, or red colour to plant parts.
IV. Chloroplasts contain water-soluble anthocyanin pigments only.

Which statements are correct?

Chloroplasts contain chlorophyll and carotenoid pigments. Chromoplasts contain carotene and xanthophylls that impart yellow, orange, or red colour to plant parts. Statement IV is incorrect because chloroplasts do not contain only water-soluble anthocyanin pigments.

Cell the Unit of Life MCQs