Page 91 - Active Science 5 Ebook and Activity

A lot of information about the surface of the moon has been obtained through photographs
clicked by unmanned missions. India’s first unmanned mission to the moon was

Chandrayaan—1.

Surface of the Moon Factual Study
Chandrayaan - 1 was India’s first lunar
craft, India’s first mission to the moon. It
was launched by the Indian Space Research
Organization, ISRO Sriharikota, Andhra
nd
Pradesh on 22 October, 2008.
The most significant discovery of this maiden
mission was the discovery of water on moon.

Footprints on the Moon

Phases of the Moon
The changing shapes of the moon are called the Phases of the moon. The moon changes
its shape every night. Sometimes it is a round ball, sometimes C-shaped and sometimes

it disappears completely. This happens due to moon’s visibility of only its that part that
reflects the sunlight to us as it moves around the earth in its orbit.
: • The seed in beaker A does not germinate.
Observation
• The seed in beaker B shows germination.

• The seed in beaker C does not germinate.

Conclusion : This is because only seed B gets both water and air which are
necessary for germination. Seed A does not get air or oxygen and seed
C does not get water. However, a suitable temperature was there for

all the three seeds.

Phases of the Moon
Let’s Recapitulate

E clipses
State whether true or false.
____

1. Production is the process of creating offspring.

The sun is very large in size and it produces light of its own. The earth and the moon are

2. Cotyledons or seed leaves store food for a growth of a new plant.

much smaller in size and do not produce any light. Moon reflects the light of the sun. ____
3. The process by which seeds disperse into the new plant is known as germination. ____
Eclipse means when a heavenly body hides another heavenly body by its shadow.
4. Radical grows to form root system. ____
We know that earth revolves around the sun and the moon revolves around the earth. If
the sun, the earth and the moon come in a straight line, eclipses occur. Sometimes the
Seed Dispersal
moon comes in between the sun and the earth, or earth comes between the sun and the
In case many seeds grow close to each other, they will compete with each other for food,
moon. Accordingly two types of eclipses are seen.
water and sunlight. Therefore, it becomes necessary for the seeds to be dispersed away
from the parent plant. The process of spreading seeds to different places is called seed
dispersal. Active Science-5 91
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.
Dispersal by Wind
Dandelion Seeds
The seeds of some plants are very light
in weight. They also have stiff wings that

allow them to fly long distances. Such seeds
are easily carried by wind. Examples of
plants whose seeds are dispersed by wind
are maple, cotton, hiptage and dandelion. Cotton Seeds

Dispersal of Seeds by Water

Plants which grow in rivers, oceans and
ponds or near water bodies use water for
dispersal of seeds. Some fruits are so light Maple Seeds
that they can float on water and are carried
to far-off places. The coconut has a heavy Lotus Seeds

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