Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Diatoms belong to which kingdom and are characterized by their unique cell walls made of what?
Plantae, cellulose
Protista, silica
Fungi, chitin
Monera, peptidoglycan
A prokaryotic cell lacking MreB protein is most likely to exhibit which shape?
Rod-shaped
Spiral
Spherical
Filamentous
Which structural component of a prokaryotic cell exhibits the highest resistance to lysozyme digestion?
Gram-positive cell wall
Gram-negative cell wall
Mycoplasma membrane
Bacterial capsule
Which of the following statements regarding the chemical composition of the secondary cell wall is INCORRECT?
It may contain lignin, suberin, or cutin.
It often has multiple layers, denoted as S1, S2, and S3.
It predominantly contains pectin and hemicellulose.
Cellulose microfibrils are arranged in a more parallel fashion compared to the primary wall.
The orientation of cellulose microfibrils in the cell wall plays a crucial role in determining cell shape. If a plant cell has cellulose microfibrils arranged predominantly perpendicular to the direction of cell elongation, what shape is the cell most likely to adopt?
Spherical
Elongated/Rod-like
Cuboidal
Irregular
Plasmodesmata are crucial for intercellular communication. Which component of the cell wall is specifically disrupted during plasmodesmata formation?
Secondary cell wall only
Primary cell wall only
Middle lamella only
Primary cell wall and middle lamella
Callose deposition is often associated with specific plant responses. Which of the following scenarios is LEAST likely to induce callose deposition?
Wounding or pathogen attack
Abscission zone formation
Pollen tube growth
Rapid cell elongation during growth
Which enzymatic activity is primarily responsible for loosening the cell wall structure during cell expansion?
Cellulase
Pectin methylesterase
Expansin
Lignin peroxidase
The presence of which compound in the cell wall significantly contributes to the resistance of woody tissues to decay and compression?
Suberin
Cutin
Pectin
Lignin
A plant cell is placed in a solution, and its volume initially increases. After a while, the volume increase stops. Which of the following BEST explains why the volume stopped increasing?
The cell membrane reached its maximum stretching capacity.
All available water in the solution was absorbed by the cell.
The cell wall became impermeable to water.
Turgor pressure reached equilibrium with the external solution's osmotic pressure.
