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Morphology of Flowering Plants
Modifications of Root and Stem
2 questions from 2 papers, each with its answer.
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Concepts tested
- Homologous organs
- modifications of stem and root
All Questions
2022 1 question
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Identify the correct set of statements: A. The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea B. Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin C. Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves D. Rhizophora shows vertically upward growing roots that help to get oxygen for respiration E. Subaerially growing stems in grasses and strawberry help in vegetative propagation Choose the correct answer from the options given below.
2011 AIPMT-MAINS 1 question
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Sweet potato is homologous toHomologous organs have the same origin (same basic structure) although their functions may differ.
Sweet potato is a modified root (a swollen adventitious root that stores food).
Turnip is also a modified root (a swollen tap root that stores food), so the two are homologous.
Ginger (rhizome), potato (stem tuber) and $Colocasia$ (corm) are modified underground stems; they are only analogous to sweet potato.
Hence sweet potato is homologous to turnip.