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1)crosspollination and self pollination

2)tuber and rhizome


Asked by nathsantanukumar 9th April 2018, 5:53 PM
Answered by Expert

1. Differences between self-pollination and cross-pollination:



It is the transfer of pollen grains from the anther to the stigma of the same flower.

It is the transfer of pollen grains from the anther of one flower to the stigma of another flower of a different plant of the same species.

It does not require any external agent, such as wind, water and insects, to carry out pollination.

It requires an external agent for pollination to occur.

It can take place even when the flower is closed.

It can occur only when the flower is open.

In self-pollinated flowers, the anther and stigma mature at the same time.

In cross-pollinated flowers, the anther and stigma mature at different times.

It preserves parental characters

It does not preserve parental characters.

New varieties are not possible.

New varieties can be produced.

As new variations are not possible, the offspring cannot adapt to changing environmental conditions.

As new variations are possible, the offspring are healthier and are able to adapt to changing environmental conditions.

2. Differences between tuber and rhizome:



Stout, dorsoventrally flattened underground stem

Swollen, underground stem

Dorsoventrally flattened

Spherical, oblong or oval

Less stouter than tubers

More stouter than rhizomes

Nodes bear adventitious root on the lower side

Nodes do not bear roots

Buds are present in the axils of scaly leaves and also as terminal buds

Buds in the form of eyes present on the surface


Answered by Expert 10th April 2018, 6:12 PM
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