a) A Nastic response / haptonasty;
B Thigmotropism;
b) A
-The plant secrets sugary secretions that attract insects.
-Insect touch is sensitive / triggers hairs in the leaves / midrib. The midrib cells lose water by osmosis; the midrip becomes flaccid causing the trap to spring and thus trap insects due to interlocking of the spines.
B
-At the point of contact, Auxins /IAA to migrate to side away from contact; reaching to a higher auxins concentration at point away from contact than at point of contact.
-High auxin concentration stimulate shoot growth thus side away from contact grows faster than the side in contact; leading to continuous coiling of the shoot / tendrils along support material.;
c) A
- Enables feeding in insectivorous plant.
B
- Enables shoots of herbaceous plants to obtain support to expose leaves for photosynthesis; flower for pollination fruits and seeds for dispersal.;
d) Nitrogen deficient soil / marshy areas.;
sharon kalunda answered the question on May 23, 2019 at 14:36
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