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Question
Study the diagrams given below and answer the following questions:
- Name the structures shown as X and Y in the figures (A) and (B), respectively.
- Write the functions performed by the structures X and Y.
- Name the phenomenon depicted and define it.
- How do the structures X and Y differ from each other?
- Give examples of the plants which show the said phenomenon.
Solution
- X - Stem Tendril
Y - Leaf Tendril - Stem and leaf tendrils assist the plant in ascending a support.
- Thigmotropism.
The growth movement of plant parts in response to touch stimulus is called thigmotropism. - The stem tendril (X) is the terminal outgrowth that facilitates the plant's ascent.
The leaf tendril (Y) is the entire leaf modified into tendrils to turn around the suitable host. - Sweet Pea
Vines and Cuscuta.
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