Step 1: Core Idea:
The question seeks the most prevalent polysaccharide in a plant cell wall's structure.
Step 2: Breakdown:
Let's examine the choices:
\[\begin{array}{rl} \bullet & \text{Chitin: This polysaccharide is structural in fungal cell walls and arthropod exoskeletons, NOT plant cell walls. } \\ \bullet & \text{Cellulose: This long-chain glucose polysaccharide is the main structural component, providing plant cell walls with rigidity and strength. It is the most abundant organic polymer globally. } \\ \bullet & \text{Starch: This is the primary energy storage polysaccharide in plants, stored in granules within the cytoplasm and plastids, NOT in the cell wall. } \\ \bullet & \text{Glycogen: This is the main energy storage polysaccharide in animals and fungi. } \\ \end{array}\]Therefore, cellulose is the abundant polysaccharide in plant cell walls.
Step 3: Conclusion:
Cellulose is the most abundant component of plant cell walls.
Assertion (A): Xylem tissue moves water and minerals obtained from the soil by the roots.
Reason (R): Xylem tissue is found only in the roots of a plant.
Name the movement which causes ‘X’ and ‘Y’ to grow downwards and upwards respectively. (Refer above figure)
Write the name of a hormone that plays a major role in (i) falling of leaves (ii) rapid cell division.
Leaves of the sensitive plant move very quickly in response to ‘touch’. How is this stimulus of touch communicated and explain how the movement takes place?