Question

Rhizozome, corm, tendril and tubber which is the odd one & justify your answer

Answer 1

MODIFICATION OF STEM - DEFINITION

• The stem is the part of the plant that provides support and helps in conduction.
• In some plants, the stem is modified for some other functions such as:
• Underground stem modification- inter such modification, stems remain under the soil and store the large amount of food e.g., potato, ginger etc.
• Sub-aerial modification- in such modification, week stems lie horizontally on the ground and develop adventitious roots that help in vegetative propagation e.g., grass, pumpkin etc.
• Aerial stem modification- in such modification, axillary buds are modified to thron and tendril for protection and support e.g., rose, pea etc.

STEM MODIFICATION - DEFINITION

• In some plants the stems are modified to perform the function of storage of food, support, protection and vegetative propagation.

1. 1. For food storage: Rhizome (ginger), Tuber (potato), Bulb (onion), Corm (Colocasia).
2. 2. For support: Stem tendrils of watermelon, grapevine, cucumber.
3. 3. For protection: Axillary buds of stem of citrus, Bougainvillea get modified into pointed thorns. They protect the plants from animals.
4. 4. For vegetative propagation: Underground stems of grass, strawberry, lateral branches of mint and jasmine.
5. 5. For assimilation of food: Flattened stem of Opuntia contains chlorophyll and performs photosynthesis.

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