1.

Amongst pea tendrils, opuntia spines, lemon thorns and cucurbit tendrils.Which ones are homologous structures?Why do you call them homologous?

Answer»
  • Pea tendrils and opuntia spines are homologous. 
  • Lemon thorm and cucurbit tendrils are homologous.

Reason:

  • Pea tendrils and Opuntia spines are modified leaves (same orign) but perform different functions.
  • Lemon thorns and cucurbit tendrils are modified stems. Both arise from axillary position. Both perform different functions.


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