Reproduction in Animals for Class 5th – Reproduction is one of the most important characteristics of living beings produce their young ones. It is important for life to continue on earth.
All animals have the ability to produce their young ones. However, all animals do not reproduce in the same way.
Reproduction in Animals for Class 5th
There are two different ways of reproduction in animals.
- BY GIVING BIRTH TO YOUNG ONES.
- BY LAYING EGGS.
ANIMALS THAT GIVE BIRTH TO YOUNG ONES
Many Animals do not lay eggs. They give birth to young ones. Animals that give birth to young ones and produce milk to feed them are called mammals. These animals are the most highly developed among all animals. Their body is covered with hair. These animals carry the young ones within their bodies until they are fully developed to be born.
Mammas take good care of their young ones. They feed them, clean them and keep them safe until they have learned to look after themselves. Tigers, elephants, horses, dogs, and cats are mammals. Even human beings are mammals.
Some water animals like whales and dolphins are also mammals. The bat is the only mammal that can fly. It also gives birth to young ones. It does not make a nest but lives in old buildings or caves. The mother bat feeds and takes care of the baby bats.
ANIMALS THAT LAY EGGS
Birds, reptiles, fish, amphibians, and insects reproduce by laying eggs. Some young ones that come out after hatching looks like the parent animals. Some look very different at birth but as they grow they look like their parents.
Birds reproduce by laying eggs. Nests are built by birds when they want to lay eggs. Eggs remain safe in the nest. They sit on them to keep them warm. After some time the eggs hatch and the baby birds come out. They remain in their nest till they learn to fly.
STRUCTURE OF AN EGG
Eggs of all birds have a similar structure. An egg of a bird has a hard protective shell to protect the chick growing inside. It contains a central yellow yolk which is surrounded by white albumin. The yolk is rich in vitamins and minerals and provides nourishment to the growing chick inside the egg. The growing chick inside the egg is called the embryo.
The parent bird sits on the eggs and keeps them warm. When the chick is completely formed, it breaks the shell and comes out. This is called hatching.
FISH (AQUATIC ANIMAL)
The female fish lays thousands of eggs at a time. The eggs are laid in water. These eggs float in water and grow into small fish. Fish eggs do not have shells.
They are surrounded by a kind of jelly that protects them from water. Many eggs and young fish are eaten by other bigger fish. Only a few of them grow to become an adult fish.
Reptiles like snakes, lizards are crocodiles lay eggs on land. Their eggs are protected by shells that are thick and leathery. After laying eggs, some of the reptiles go away and never come back. They never take care of their eggs.
These eggs are warmed by the heat of the Sun. Many eggs are eaten up by other animals.
You are read Reproduction in Animals for Class 5th
The female frog lays many eggs in water but not as many as the fish. The life cycle of a frog has four stages. The egg cluster of the frog is called spawn which develops into a tadpole. Then it slowly changes into a young frog.
The legs grow longer and the tail grows shorter. Then it grows into an adult frog that has no tail.
Insects also lay eggs. Insects like grasshopper and cockroach have three stages in their life cycle. Other insects like butterflies and houseflies pass through four stages in their life cycle.
The life cycle of a cockroach is a three stages life cycle. The baby cockroach that comes out of the egg differs very little from the adult. It is called a nymph.
It is small and does not have wings, as it grows it sheds its old skin and grows a new one. This is called moulting. After many moultings, a nymph becomes an adult cockroach.
The cycle of butterfly is a four-stage cycle. The young one which hatches out of the egg is quite different from the adult butterfly. It is called a caterpillar.
Now it begins to eat. As the caterpillar eats, it sheds its old skin and grows. When it is fully grown, its skin hardens to form a pupa. Inside the pupa, the caterpillar keeps changing. Finally, the pupa bursts and the adult butterfly comes out.
Animals like fish, snakes, and insects do not take care of their babies. Without the protection of parents, many of these offsprings would not survive. The young ones which survive help in continuing the species.