Practice free Cell Structure (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The net direction and rate of osmosis depends upon
11.2.2 Osmosis
Page number-180
Transport in Plants
The net movement of water is zero till
11.2.2 Osmosis
Page number-180
Transport in Plants
Which of the following organisms do not possess cell wall?
11.2.3 Plasmolysis
Page number-182
Transport in Plants
Which of the following describes the cell wall of bacteria?
According to the NCERT text, 'Most prokaryotic cells, particularly the bacterial cells, have a chemically complex cell envelope. The cell envelope consists of a tightly bound three layered structure i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane.' And further, 'Glycocalyx differs in composition and thickness among different bacteria. It could be a loose sheath called the slime layer in some, while in others it may be thick and tough, called the capsule.' Mycoplasma does not have a cell wall.
The cell wall determines the shape of the cell and provides strong structural support to prevent the bacterium from:
The context states: 'The cell wall determines the shape of the cell and provides a strong structural support to prevent the bacterium from bursting or collapsing.'
What is the primary function of the cell wall in a young plant cell, known as the primary wall?
The NCERT text mentions: 'The cell wall of a young plant cell, the primary wall is capable of growth, which gradually diminishes as the cell matures and the secondary wall is formed on the inner (towards membrane) side of the cell.'
Which of the following organic components are found in the cell wall of algae?
As per the NCERT text: 'Algae have cell wall, made of cellulose, galactans, mannans and minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose, pectins and proteins.'
The middle lamella, which glues neighboring cells together, is primarily composed of:
The text clearly states: 'The middle lamella is a layer mainly of calcium pectate which holds or glues the different neighbouring cells together.'
What are the structures that traverse the cell wall and middle lamella, connecting the cytoplasm of neighboring cells?
The NCERT excerpt states: 'The cell wall and middle lamellae may be traversed by plasmodesmata which connect the cytoplasm of neighbouring cells.'
Schwann's observation that the presence of a cell wall is a unique character of plant cells contributed to the formulation of:
The text states: 'He also concluded, based on his studies on plant tissues, that the presence of cell wall is a unique character of the plant cells. On the basis of this, Schwann proposed the hypothesis that the bodies of animals and plants are composed of cells and products of cells. Schleiden and Schwann together formulated the cell theory.'
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