In Eichhornia, the purpose of stem modification is

defense

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photosynthesis

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vegetative propagation

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water storage

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Solution

The correct option is C
vegetative propagation

Eichhornia and Pistia have a lateral branch with short internodes and each node has a rosette of leaves and tuft of roots. Such a stem modification is known as an offset.
The offset is meant for vegetative propagation.
Due to this property, Eichhornia (water hyacinth) grows extensively and is known as the most problematic aquatic weed. It is also popular as the 'Terror of Bengal' as it causes an imbalance in the ecosystem dynamics of the water body.

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In Opuntia, the stem is modified into a flattened green structure to perform the functions of leaves, (i.e., photosynthesis). Cite some other examples of modifications of plant parts for the purpose of photosynthesis.

Q. Stem modification found in Gladiolus is

Q. In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for the purpose of photosynthesis.

Statement-A:

It is a sub aerial weak stem which bear short internodes and each node bears rosette of leaves and cluster of roots.

Statement-B:

It is found in

P i s t i a

and

E i c h h o r n i a

.
Considering the given statements, identify the modification of stem

Q. Explain the purpose of modification of roots.

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