Multiple choice

Excretory products of plants are __________.

  1. lignin and cellulose

  2. cellulose and resin

  3. resin and gums

  4. gums and lignin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Resins and gums are the excretory products of plants that are stored in xylem (water and minerals conducting channel). Resin is a viscous, thick and sticky liquid, secreted by some plants especially by coniferous trees. Gums are mucilaginous substances secreted by the plants. Cellulose is the most abundant component of plant cell walls. Lignin is a component of cell walls, which binds cellulose fibres, confers strength and hardens the wood.

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