CLASS - 3RD_NEW TRENDS IN SCIENCE_CHAPTER - 6. Insects

インデックス作成: 2026-05-18

[00:00:00][Music] insects insects are usually the small creatures that we often see in our surroundings most of the insects have wings which are not very muscular does there is a limitation for their flight some of the common insects which we come across in our daily lives are ants beetles bees flies mosquitoes and cockroaches parts of an insect's body most of the insects have six legs the body of an adult insect is divided into three parts head thorax and abdomen [Music] insects have Anthony on their head this Anthony is a thin whip-like structure which helps the insect to smell and feel most of the insects have wings these wings do not have strong flight muscles hence they fly only for short intervals and short distance insects have a hard outer covering called chitin on their body a cockroach has a set of Antony which helps it to locate its food helps in movement insects like butterfly have a long sucking tube in their mouth called Pro Boyce's a butterfly uses this tube to suck nectar from a flower most insects have two pairs of wings in certain cases there is only one pair of wings as that of housefly some insects don't have wings and and louse are wingless insects insects breathe through tiny air holes called spiracles present on the body surface there are many small creatures that look like insects but are not insects spider scorpion centipede millipede snail earth warm etc are such creatures commonly seen around us but these are not put under the category of insects social insects [Music] some insects live together in colonies or communities they live in societies like man they are called social insects and and bees are social insects the social life of such insects is very well-organized each member of the community has definite work to do like us and divide the work of the colony among them queen ant queen ant spends all her life in laying eggs mailings a few winged male ants help the queen ants in laying eggs [Music] female worker ants thousands of wingless female worker ants gather food take care of eggs and maintain the colony life cycle of a butterfly a butterfly completes its lifecycle in four stages egg larvae caterpillar pupa and adult butterflies lay eggs on plant leaves eggs hatch to produce larvae it is also called caterpillar it is very different from the adult butterfly larva caterpillar molds to form pupa pupa changes to adult butterfly [Music] useful insects some insects are useful to us they help us in many ways honey bees collect nectar from flowers they store it as honey The Beehive is made of wax thus we can say that wax is also produced by bees some insects like butterflies bees etc help in pollination we get silk from the pupae of silk moth many insects act as useful scavengers they eat up dead animals and plants [Music] harmful insects insects like grasshopper beetle locust etc damage our crops vegetables and fruits they are called pests mosquitoes spread diseases like malaria filaria yellow fever etc white ants silverfish cloth moths feed on the wood paper and clothes in our homes thus they cause damage to our household things simple steps to get rid of unwanted insects hair should be kept clean by washing and regular combing this keeps hair healthy and free of head louse mothballs or dried neem leaves should be kept with silk or woolen clothes they keep insects away we should spray chemicals like DDT and other insecticides in the places we are insects live