The following statements about insect molting are incorrect

Most insects have an exoskeleton on the body surface, to protect, support and prevent the loss of water in the body, the exoskeleton can not cover the hand with the growth of the body and become larger, when the insect gradually grows, the exoskeleton will limit the growth of the insect, because the phenomenon of insects taking off the exoskeleton in the growth process is the phenomenon of molting Chunzheng phenomenon The number of molts in the life of insects is generally 4 or 5 times, and they usually develop into adults and no longer molt

So the answer is: 4 5 times; Imago.

The exoskeleton on the surface of the insect body can protect and support the internal organs, and the exoskeleton can prevent the evaporation of water in the body The exoskeleton cannot grow with the growth of the insect, and if you want to grow up, you must take off the exoskeleton, so the insect has molting during growth and development Insect molting is the exoskeleton that is shed, not **

So the answer is:

Molting is the phenomenon of insects shedding their outer bones in the process of growth and development, such as locusts from nymphs to adults, a total of 5 times of molting before developing into adults, but not all insect larvae have to go through land trap five times of molting, such as silkworm larvae molting 4 times to develop into adults, so the question stem of the land annihilation statement is incorrect

So the answer is:

Molting in insects is necessary for growth, because the epidermis of insects, also called exoskeletons, is made up of waxy layers and chitin layers. The waxy layer is located in the outermost layer of the surface layer and prevents the evaporation of water. Chitin is a complex nitrogenous polysaccharide that is the main component of the exoskeleton.

The growth and development of insects is different from that of other animals, and after the eggs hatch and the larvae hatch, they need to go through several molts before they can gradually grow and mature. This is caused by the special skin of the insect.

The outer skin of an insect's body is called the epidermis, which is a secretion of cells and does not grow. Therefore, when the insect grows up, this layer of epidermis around the body becomes an obstacle that restricts growth, and the insect has to shed the old epidermis and replace it with a new, larger epidermis. When the old skin is molted and the new skin is not ossified, the insect absorbs a large amount of water and rapidly expands its body.

Each time an insect sheds a layer of skin, not only does the body grow, but the internal organs also develop further, and at the same time, the external morphology changes.

The coat that insects take off is biologically called metamorphosis.

The reason is that the larvae of insects gradually become larger in size as they grow, and the exoskeleton on their surface.

And ** will be swelled by the gradually larger body. Slowly, larvae"Coats"It begins to fall off, creating a new layer of larger, harder epidermis. The larvae undergo multiple metamorphoses before they grow into adults.

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【Answer】A [Answer Analysis] Test Question Analysis: The body surface of insects has a hard exoskeleton, and its main role is to protect and support the soft internal organs and prevent the evaporation and loss of water in the body This is one of the characteristics of adapting to life on land The exoskeleton cannot grow with the growth of the insect body, so in the process of growth and development of insects, there is a phenomenon of shedding the original exoskeleton, which is molting Therefore, A

Test site: The reproductive and developmental processes of insects

Most insects have an exoskeleton on the body surface, which protects, supports and prevents the loss of water in the body, the exoskeleton can not grow larger with the growth of the body, and when the insect gradually grows up, the exoskeleton will limit the growth of the insect, because the phenomenon of the insect taking off the exoskeleton in the process of growing is the phenomenon of molting

Therefore, c