Question

How reproduction of hydra differs from hens? [5 MARKS]

Answer 1

Each point: 1 Mark
Diagram: 3 Mark

1. In each hydra, there may be one or more bulges. These bulges deveolps into new individuals and they are called buds. In hydra, the new individuals develop as outgrowths from a single parent. Since new individuals develop from the buds in hydra, this type of asexual reproduction is called budding.

2. In case of hens, soon after fertilization, the zygote divides repeatedly and travels down the oviduct. As it travels down, many protective layers are formed around it. The hard shell that you see in a hen’s egg is one such protective layer. After the hard shell is formed around the developing embryo, the hen finally lays the egg.