Invertebrate Zoology

A larva is a distinct juvenile form many animals undergo before metamorphosis into adults. Caterpillar is the common name for the larvae of members of the order Lepidoptera (the insect order comprising butterflies and moths). A maggot is the larva of a fly (order Diptera). 

In each stage of complete metamorphosis, the animal looks different than at all other stages. This is different from incomplete metamorphosis where the early stages of development look like tiny versions of the adult. Butterflies are an example of an insect that goes through all the stages of complete metamorphosis.

The larva is that stage in metamorphosis following which the adult stage is reached. The larvae consume a lot of food in order to fuel their transition into the adult form. Hence, during the larva stage the creature eats a lot of food which acts as the source of nutrition and energy, required for its transformation into an adult.

• Complete metamorphosis consists of four stages i.e. egg, larva, pupa and adult.
• Incomplete metamorphosis consists of three stages i.e. egg, nymph and adult.
• Examples of organisms having incomplete metamorphosis in their life cycle are termites, praying mantis and cockroaches.

So, the correct option is '3'.

Metabolism is the sum of the physical and chemical processes in an organism by which its material substance is produced, maintained,
and destroyed, and by which energy is made available.
Metamorphosis is a profound change in form from one stage to the next in the
life history of an organism, as from the caterpillar to the pupa and from the pupa to the adult butterfly.
Metastasis the transference of disease-producing organisms to other parts of the body by way of the blood or lymphatic vessels or membranous surfaces Morphology is the branch of biology dealing with the form and structure of organisms

• Complete metamorphosis consists of four stages i.e. egg, larva, pupa and adult. 
• Incomplete metamorphosis consists of three stages i.e. egg, nymph and adult.
• Complete metamorphosis occurs in wasps, ants and butterflies while incomplete metamorphosis occurs in termites, praying mantis and cockroaches.

So, the correct answer is 'Complete and Incomplete'.

Moulting is the process of casting off the dead rigid outer covering or the exoskeleton or skin of the animal body during its growth. The young larvae casts off its skin in order to allow the growth of the larvae to from the adult. This process is also known as ecdysis.

• Metamorphosis refers to the way that organisms develop, grow, and change form.
  
• Metamorphosis majorly occurs in insects.
• metamorphosis has four stages i.e egg, larva, pupa and adult. The female lays eggs then the larva hatch from the eggs. Then the larva makes cocoons around themselves this stage is called a pupa. Inside the cocoon, the larvae change into the adult.
• Hence Changes that convert larva into adult constitute metamorphosis

So, the correct answer is 'Metamorphosis'.

Metamorphosis is the process of transformation from an immature form to an adult form in two or more distinct stages. metamorphosis generally takes place in insects or amphibians and some molluscs, crustaceans, cnidarians, echinoderms and tunicates.
Metamorphosis is seen in frogs which are developed form of the larval stage called the tadpoles. Also, metamorphosis is seen in insects where the adult forms develop from the larva and which also includes the pupal or resting stages as in silkworms.
So, the correct answer is option D.

Incomplete metamorphosis involves three stages: egg, nymph, and adult. The nymph resembles a small adult and undergoes gradual development through molts. Complete metamorphosis has four stages: egg, larva, pupa, and adult. Three-stage development is characteristic of insects like grasshoppers and true bugs.

Insects shed their exoskeleton in order to grow which is known as moulting. Moulting allows the body of insects to expand under protected conditions. An instar is a developmental stage of insects, between each moult until sexual maturity is reached.

Grasshoppers, cockroaches, and lice undergo incomplete metamorphosis (nymph stage), whereas mosquitoes undergo complete metamorphosis (egg, larva, pupa, adult).

Winged adults lay eggs on the food plant on which their larvae, known as caterpillars, will feed. The caterpillars grow, sometimes very rapidly, and when fully developed pupate in a chrysalis. When metamorphosis is complete, the pupal skin splits, the adult insect climbs out and, after its wings have expanded and dried, it flies off. Some butterflies, especially in the tropics, have several generations in a year, while others have a single generation, and a few in cold locations may take several years to pass through their whole life cycle.

In complete metamorphosis, organism passes through four distinct stages in their life cycle. Moths pass through caterpillar and pupa stage while reaching from egg to adult stage, hence they undergo complete metamorphosis.