This document provides information about metamorphosis and frog development. It defines metamorphosis and describes the indirect development process that frogs undergo, starting as an egg laying tadpole and transforming through developmental stages into an adult frog. Key stages in a frog's life cycle are outlined, and the role of hormones like thyroxine in facilitating metamorphosis is explained. The document aims to teach students about these concepts through text, videos and a suggested hands-on art activity using modeling or mosaics.

2. CONTENT:
 Introduction
 Types of development
 Defining metamorphosis
 Life cycle of a frog
 Video showing frog’s life cycle
 Role of hormones in metamorphosis
 Worksheet
 Activity for kids

3. LEARNING OUTCOMES:
 Students will be able to :
 Define metamorphosis.
 Differentiate between direct and indirect
development.
 List the changes that take place when a
tadpole changes into an adult frog.
 Develop the skill of drawing using methods
like clay modelling .
 Explain the role of iodine in the process of
metamorphosis.

4. INTRODUCTION
• There are two different types of
animals depending on whether female
gives birth to young ones or lay eggs i.e:
• OVIPAROUS
• VIVIPAROUS
• All young ones grow to form adults
regardless of whether they have
hatched from an egg or are born
directly.

5. TYPES OF DEVELOPMENT
 Different organisms show different
development pattern depending on
whether the young one at birth is
miniature version of adult form or not.
 There are two types of development
shown by the organisms:
1. Direct development
2. Indirect development

6. DIRECT DEVELOPMENT
 Young one at birth is a miniature version
of the adult form.
Example : birds and mammals

9. INDIRECT DEVELOPMENT
 Young ones are initially very different
from their adults.
 Also there are number of features in adult
form which are not present in larval stages
or in initial stages.
Example :
1. Tadpole looks very different from a frog.
2. A caterpillar looks very different from a
butterfly.

11. STAGES OF A
SILKWORM

12. METAMORPHOSIS
DEFINITION :
 A radical change in structure and habit of
an animal (as in case of butterfly or a
frog) during its life cycle is termed as
metamorphosis.
OR
 Transformation of a young one into an
adult through number of drastic changes
in its form and structure.

13. JOURNEY
FROM
A
YOUNG ONE TO ADULT

15. Learning through video

16. KEYPOINTS :
 Eggs are laid in water.
 Tadpole emerges from the egg and swims
freely in water.
 Tadpole has gills, a tail and a small circular
mouth.
 Tadpole grows until it begins
metamorphosis.
 Metamorphosis is marked by the
development of hind legs followed by the
front legs.

17.  Lungs develop and tadpole begins to swim
to the surface of water to breathe.
 Intestine shortens to adapt the animal to
a carnivorous diet.
 Tail gets absorbed by the body during the
last stages of metamorphosis.
This way a tailed tadpole changes into a tail-
less frog.

18. HORMONES AND METAMORPHOSIS
 Thyroxine produced by thyroid gland of
frog is essential to carry out the process
of metamorphosis in frogs.
 Iodine is needed for the production of
thyroxine and is present in water in which
tadpoles are growing.
 In insects also, hormones control
metamorphosis and is produced by some
cells present their brain and glands
located elsewhere in their body.

20. WORKSHEET
 Define metamorphosis.
 Differentiate between direct and
indirect development.
 List three changes that take place when
a tadpole changes into a frog.
 What will happen to a tadpole if iodine
is deficient in the water where tadpoles
are growing?
 A tadpole is different from frog. How?

21. SELF ASSESSMENT
USING
GOOGLE FORMS

23. ART INTEGRATION ACTIVITY
 Draw the life cycle of a dragon or a frog or
any other organism using any of the following
technique/ method:
1. clay modelling art
2. mosaic art
NOTE:
• You can use A4 size sheet/ paper plates/
cardboard for the activity.
RUBRICS:
Creativity: 2 marks
Presentation: 2 marks
Content : 1 marks

24. SAMPLES