Page 4 - Active Science 5 Ebook and Activity

Key Features

Learning Objectives
Growing New Plants
1
Outline the various learning
outcomes and enable the
Learning Objectives
• Growing new plants from seeds, roots, stems, leaves and spores. teacher to plan the lesson in
To Understand
• Dispersal of seeds. Observation
• Large scale production of crop.
To Find Out
• Growth of new plants from seeds. a systematic manner. : • The seed in beaker A does not germinate.
• Germination of seeds. Conclusion
• The seed in beaker B shows germination.
• Crop cultivation for human use. • The seed in beaker C does not germinate.
Plants are the main source of food for both animals and human beings. We eat the Let’s Recapitulate all the three seeds.
Let’s Begin : This is because only seed B gets both water and air which are
flowers, seeds, stems, roots, bulbs, tubers, fruits and leaves of many plants. This is the
necessary for germination. Seed A does not get air or oxygen and seed
reason we need to grow new plants to get regular supply of food.
C does not get water. However, a suitable temperature was there for
Write the part of the plant from which these food items are obtained. State whether true or false.
2. Cotyledons or seed leaves store food for a growth of a new plant.
1. Production is the process of creating offspring.

_____________________ 4. Radical grows to form root system. ____
_____________________ Seed Dispersal ____
_____________________
3. The process by which seeds disperse into the new plant is known as germination. ____
____
Let’s Recapitulate In case many seeds grow close to each other, they will compete with each other for food,
_____________________ dispersal.
_____________________ from the parent plant. The process of spreading seeds to different places is called seed
_____________________ Active Science-5 9 Interspersed in between the Dispersal by Wind
water and sunlight. Therefore, it becomes necessary for the seeds to be dispersed away
text, the test offers scope for allow them to fly long distances. Such seeds
Seeds are dispersed in a number of ways. They may be carried by wind, water or animals.
In some plants the fruits explode, releasing a number of seeds in the air.
The seeds of some plants are very light
in weight. They also have stiff wings that
a quick review on the topics are maple, cotton, hiptage and dandelion. Dandelion Seeds
are easily carried by wind. Examples of
plants whose seeds are dispersed by wind
shortly covered. dispersal of seeds. Some fruits are so light Cotton Seeds
Dispersal of Seeds by Water
Plants which grow in rivers, oceans and
ponds or near water bodies use water for
that they can float on water and are carried
12 to far-off places. The coconut has a heavy Maple Seeds
Active Science-5 Lotus Seeds
3. Shell: Animals such as turtles, snails
and tortoise are protected by a hard
shell. When these animals sense
danger, they withdraw their head and Shell
feet into the shell. This hard shell Shell
safeguards them from predators. Snail Turtle
4. Feathers: The birds fly in air easily
due to feathers. Feathers also keep Flight feathers
them warm during the cold weather.
Additionally, birds also have a light Down feathers Body feathers
body and hollow bones that enable an
easy flight.
5. Hard body covering: Grasshopper Activity
and cockroach are insects which have Chitin
a hard body covering. This covering is
made by a substance called chitin.
In text hands on activities
Cockroach
Grasshopper
Let’s Recapitulate enable students to learn by
Fill in the blanks.
1. The body of polar animals is covered with _________________.
2. Ocean waters are _______________________ doing themselves and reveal
3. Animals that can live both on land and in water ____________________.
4. __________________ is the earth’s largest habitat.
5. Shedding of old skin to replace with the new skin is called ______________.
the facts of science.
6. _________________ forms a protective covering in insects.
Activity 2.1
Visit the biology laboratory in school. Try to find a frog kept in a big jar filled with water. Make
five observations about adaptations that help it to live in water.
A daptations For Breathing
Breathing is essential for survival. Different animals, living in different habitats have
breathing organs to suit their environment.
Active Science-5 25
protected from herbivorous animals.
Let’s Pronounce Together 5. Crop protection: Crops need to be Scarecrow
For this, a fence is created around the
field. Pests like mice, rat and insects
are also killed by spraying chemicals
called insecticides and pesticides.
This special inclusion at the end of text, enables the put up in fields to ward off birds.
DDT and gammaxene are some
common insecticides. Scarecrows are
Harvesting
students to recall the important terms and learn their as harvesting. It can be done by the Let’s Pronounce Together
6. Harvesting: When the crop is ripe,
it is cut down. This process is known
machines. irrigation
correct pronunciation. LET’S harvesting rabi cotyledons
farmers manually or with the help of
dispersal
germination
REVISE kharif
• Plants reproduce through seeds or through vegetative means.
• A seed consists of a seed coat, micropyle, embryo and cotyledons.
• A seed needs air, water and sunlight to germinate.
• Dispersal of seeds is important for plant survival.
• Crops grown from June to October are known as kharif crops while crops grown from November

• In fields, crops are cultivated and we get grains, vegetables and fruits.
to April are known as rabi crops.
Glossary

• Reproduction
• Germination : The process of creating offsprings.
: The process by which seed grows into a new plant.
Glossary • Irrigation
• Ploughing

• Seed dispersal : The process of spreading seeds to different places.
• Manuring : The process of loosening the soil for sowing seeds.
: The process of watering the soil.
• Insecticides : The process of adding manure to fields.
A complete list of terms and their meanings have • Rabi crops : The process of cutting fully grown crops from fields.

• Harvesting
• Kharif crops
: Chemicals used to kill insects in the field.
been given at the end of the text for quick revision. : The crops sown from November to April.
: The crops sown from June to October.
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Active Science-5