In these slides i have completely explained metamorphosis with examples

1. Metamorphosis:
Its types and Benefits
Topic:

2. Composed and Delivered by :
M.Zeeshan

3. Metamorphosis:
Etymology: The word “metamorphosis” means “change in shape.”.
Def: The change in the form or structure of an individual after
hatching or birth is known as metamorphosis.
Metamorphosis mainly occur in phylum Arthropoda.
Juvenile hormones are responsible for metamorphosis.
These are physical changes and as well as alterations of the
organism’s physiology, biochemistry, and behavior occurs.

4. On the basis of metamorphosis organisms are divided into the
following groups:
1. Ametabolus:
2. Hemimetabolus
3.Holometabolous

5. Ametabolus: Little or No Metamorphosis:
Etymology: “Ametabolus," from the Greek for "having no metamorphosis."
Def: The type of organisms in which no true metamorphosis take place is
called Ametabolus.
Ametabolus organisms when emerges from the egg, looks like tiny version of
their adult form. They continue molting and growing until they reach maturity.
Examples: The most primitive insects, such as springtails, silverfish, and
firebrats, undergo little or no true metamorphosis.

6. Diagrammatically can be explain as:

7. 2. Hemimetabolus: Simple Metamorphosis:
Etymology: The word hemi mean half ,“so mean simple metamorphosis
Def: The type of organisms in which simple metamorphosis occurs is called
Hemimetabolus.
Simple metamorphosis is marked by three life stages:
• Egg,
• Nymph
• Adult
Growth for Hemimetabolus organisms occurs during the nymph stage.
Nymphs resemble the adults in most ways, particularly in
appearance, exhibit similar behaviors, and typically share the same
habitat and food as the adults.

8. Examples of Hemimetabolus organisms:
Grasshoppers, Mantids, Cockroaches,
Termites, Dragonflies, and all true bugs.

9. 3.Holometabolous: Complete Metamorphosis
Etymology: “Holo” means “complete”
Def: The type of insects in which complete metamorphosis take place
is called Holometabolous.
Most insects undergo complete metamorphosis
Complete metamorphosis consists of four stages:
• egg,
• larva,
• pupa, and
• Adult.

10. Each stage of the life cycle—egg, larva, pupa, and adult—is marked
by a distinctly different appearance.
Their habitats and food sources may be entirely different from
the adults as well.
Egg Stage: Eggs are laid by the adult female.
Larva stage: The Feeding Stage
Egg hatches and larva is released
It is the immature form (between egg and pupa) of organisms
with complete metamorphosis.

11. Larva of each specie has different name.
For example:
Butterfly and moth larvae are known as caterpillars;
fly larvae is known as maggot,
beetle larvae as called grub.
Larvae grow and molts multiple times and finally pupa
forms
Pupa: The Transition Stage
• The pupal stage is usually considered a resting phase, although
many active changes are occurring internally, hidden from view.

12. Adult: The Reproductive Stage
After the reorganization is complete, the pupa molts to reveal a mature adult
They look very different from the larva.
The adult's job is to mate and lay eggs.
Examples:
Most of the world's insect species—including butterflies, moths,
true flies, ants, bees, and beetles—are Holometabolous.

15. Benefits of Metamorphosis:
Reduction of competition:
The benefit of metamorphosis may lie in its ability to
reduce competition. Pre-metamorphic animals typically
consume completely different resources from their adult forms.
For example: Caterpillars eat leaves; butterflies live off of nectar.
Different Habitat:
Each form of metamorphosis lives in different habitat
For example: Tadpoles live in water, frogs live on land.