Class XI Biology
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100 questions in this chapter
Question 41 of 100
ð CLASS XI
Which statements about passive transport across membrane are correct?
I. Moves neutral solutes along concentration gradient. II. Requires ATP hydrolysis. III. Osmosis is passive movement of water across membrane. IV. Occurs without energy requirement.
Which statements are correct?
Passive transport moves neutral solutes along their concentration gradient without expenditure of ATP. Osmosis is the passive movement of water across a selectively permeable membrane. Statement II is incorrect because passive transport does not require ATP hydrolysis.
Question 42 of 100
ð CLASS XI
Read the statements regarding facilitated diffusion and active transport:
I. Carrier proteins facilitate transport of polar molecules across nonpolar lipid bilayer. II. Active transport moves molecules against concentration gradient. III. Active transport utilizes cellular ATP energy. IV. Na+/K+ pump is an example of passive simple diffusion.
Which of the following options is correct?
Carrier proteins facilitate movement of polar molecules across the lipid bilayer. Active transport moves substances against their concentration gradient using ATP. Statement IV is incorrect because the Na+/K+ pump is an example of active transport, not passive diffusion.
I. Gives shape to the cell. II. Protects cell from mechanical damage and infection. III. Helps in cell-to-cell interaction. IV. Acts as a barrier to desirable nutrients only.
Which statements are correct?
The plant cell wall provides shape, protects against mechanical damage and infection, and facilitates cell-to-cell interaction. Statement IV is incorrect because the cell wall acts as a barrier to undesirable macromolecules rather than desirable nutrients.
Question 44 of 100
ð CLASS XI
Which statements regarding plant endoplasmic reticulum are correct?
I. Network of tiny tubular structures scattered in cytoplasm. II. Divides intracellular space into luminal and extra-luminal compartments. III. SER is actively involved in protein secretion. IV. Steroidal hormones are synthesized in SER in animal cells.
Which statements are correct?
The endoplasmic reticulum is a network of membranous tubules that divides the cytoplasm into luminal and extra-luminal compartments. Smooth ER synthesizes lipids and steroid hormones in animal cells. Statement III is incorrect because rough ER is responsible for protein synthesis and secretion.
I. Disc-shaped sacs stacked parallel to each other. II. Diameter ranges from 0.5 Ξm to 1.0 Ξm. III. Concentrically arranged near nucleus with cis and trans faces. IV. Cis and trans faces are identical in structural composition.
Which statements are correct?
Golgi cisternae are parallel stacks of flattened sacs measuring about 0.5â1.0 Ξm and possess distinct cis (forming) and trans (maturing) faces. Statement IV is incorrect because the cis and trans faces differ structurally and functionally.
Question 46 of 100
ð CLASS XI
Read the statements regarding protein processing in Golgi apparatus:
I. Vesicles from ER fuse with the cis face of Golgi apparatus. II. Proteins move from cis face towards maturing trans face. III. Proteins are modified in Golgi cisternae before release. IV. Modified proteins are released directly from the forming face.
Which options are correct?
Transport vesicles from the ER fuse with the cis face of the Golgi apparatus. Proteins are modified as they pass through the cisternae and are released from the trans (maturing) face. Statement IV is incorrect because secretion occurs from the trans face, not the forming face.
Question 47 of 100
ð CLASS XI
Select the correct statements regarding lysosomes:
I. Formed by process of packaging in Golgi apparatus. II. Contain lipases, proteases, and carbohydrases. III. Active at neutral pH of 7.0. IV. Enclosed by a single membrane.
Which statements are correct?
Lysosomes are single membrane-bound vesicles formed by Golgi packaging and contain hydrolytic enzymes such as lipases, proteases, and carbohydrases. Statement III is incorrect because lysosomal enzymes function optimally at an acidic pH, not at neutral pH.
I. Contains water, sap, excretory products, and non-useful materials. II. Bound by a single membrane called tonoplast. III. Concentration of ions is significantly higher in cytoplasm than in vacuole. IV. Occupies up to 90% of plant cell volume.
Which statements are correct?
Plant vacuoles contain cell sap, water, excretory products, and other materials. They are bounded by a single membrane called the tonoplast and may occupy up to 90% of the cell volume. Statement III is incorrect because ion concentration is generally higher inside the vacuole due to active transport across the tonoplast.
I. Outer membrane forms continuous limiting boundary. II. Inner membrane forms cristae infoldings towards matrix. III. Cristae decrease the internal surface area. IV. Both membranes have specific enzymes for mitochondrial functions.
Which options are correct?
The outer membrane forms the limiting boundary of mitochondria, while the inner membrane folds into cristae that increase the surface area. Both membranes possess specific enzymes required for mitochondrial functions. Statement III is incorrect because cristae increase, rather than decrease, the internal surface area.
I. Single circular DNA molecule. II. Few RNA molecules. III. 70S ribosomes. IV. Linear double-stranded nuclear chromatin.
Which statement combination is correct?
The mitochondrial matrix contains a single circular DNA molecule, RNA molecules, and 70S ribosomes required for protein synthesis. Statement IV is incorrect because linear chromatin is found only in the nucleus.
