Std 4 EVS SCERT [ Filed and forest]
Lesson 1
Field and Forest
1. What is
adaptation?
*An organism has
certain
peculiarities that
help it to live in its
dwelling place. This
is called adaptation.
2. Adaptation of a
fish
*boat shaped body
[enables the fish to
move through
water]
*fins and tails[help
the fish to swim in
water]
*gills[help to
breathe ]
*slimy body [help
the fish to escape
from enemies]
3. Adaptation of a
tortoise
*slimy body
*oar like legs
*webbed feet
*thick and strong
outer shell
*limbs help to move
on land
4. Adaptation of a
frog
*slimy body
*oar like legs
*webbed feet
*bulging eyes
*long and strong
legs
*help to breathe skin
and nostrills
5. Adaptation of a
duck
*Oily feathers
*webbed feet
* flat beaks
6. Adaptation of a
crocodile
*long tail
*suitable body shape
*slimy body and sharp teeth
* legs suited to walk on land
7. Adaptation of strock
*long leg and long neck
*long and pointed beak
8. Adaptation of snake
*greasy body to move water
*scales help to move land
9. Adaptation of a squirrel
*sharp nails help to climbing tree.
*Colour suitable to escape from enemies.
10. Adaptation of woodpecker
*Nailed legs that help to climb on trees.
*Thick and strong beak
11. Adaptation of Cormorant [നീർ കാക്ക]
*Oily feathers
*flexible neck
*webbed feet
12. Adaptation of Otter
* Thick water proof fur
*webbed feet
*excellent eye sight
* long whiskers
13. What are the adaptation that the water lily and lotus?
*don't decay in water
* leaves flots on the water
* leaf stalk is long
*wax like covering on leaves
*air chambers in leaves and stem
14. Some water
plants like Pistia,
Salvinia etc. have
no long roots. But
they float on water
surface Why?
* They have small
leaves and their
roots hanging in the
water. Roots can
absorb essential
nutrients from
water surface.
15. Difference
between
tortoise and turtle
*
16. Name the
creatures that can
move on Iand and in
water
*frog, Crab,
crocodile, duck,
newt, salmander,
newt, caecilion etc
17.what is
amphibians?
*Amphibians are creatures that it have small vertebrate which complete their life cycle in water and on land.
ex:
18. How can a frog
live in water and in
land?
*When in watera
frog breathes
through it's skin.
When on land, it
breaths through
nostrils.
19.Name some
aquatic plants?
*waterlily
*lotus
*pistia
*salvinia
20.write the name of
organisms that can
be seen in the
paddyfield?
*
21. What is habitat?
* The natural
shelter of an
organism is called
habitat.
22. Name some
organisms that live
in banyan tree
* birds
*Ants
*spider
*monkey etc
23. What are the
benefits that the
organisms get from
trees?
*food
*shade
*pure air
*resting place to
birds and animals
*medicine
*perfumes
*make the soil fertile
*retain water in soil
etc
24. Name some
organisms that live
in the soil
* earthworm
*Ant
*termities
*millipede
*centiped
*grass
* plnts
*trees etc
25 . What are biotic
factors?
*Living things are
called biotic factor
ex: Plants, animals
26. What are abiotic
factors?
*Non living things
are called abiotic
factors.
ex: water, soil, sunlight, air etc.
27. How do biotic
and abiotic factors
depend on the each
other?
* Plants and animals need air for breathing
*Plants and animals cannot live without water.
*Plants cannot grow without sunlight
*plants anchor the earth because of soil.
* All animals and Plants could exist in the earth beacause on the help of the abiotic factor
28. Make a table
biotic and abiotic
factor interdepence
*
29. What is
ecosystem?
*An ecosystems
includes the
mutually defendent
biotic and abiotic
factors of a
particular place.
31. Write the example for ecosystem
* pond
forest
hill
bush
field
scared groves [Kavukal] etc
32. Why forest looks
so beautiful?
Or
33. How is the forest
useful to us and
other organism?
*Rivers orginate from forest
* variety of plants
and animals are
present in forest
* forest helps to get rain
* Provide coolness
* We get variety
useful things from
forest
* We get plenty of
pure air from the
forest.
34. What are the demerits of destruction of ecosystem?
*Organisms lost their habitat
*destruction of water resources
* Extinction of organisms
35.what are the
different activities
of man that destroys
the ecosystem?
*Deforestation
*Sand-mining
*Excessive use of
pesticides
*Dumping of plastic
waste in the Soil and
water
*Reclamation of
paddy fields
36.what are the
effects
of deforestion?
*Deforestation will
lead to
the destruction
of plants
and animals. It
reduces rainfall
37. What are the
harmful effects of
demolition of hill
and forest?
*Animals lose their home
*Plants perish
*streams dry
*water scarcity
occure
*natural calmities
occure
38.What are the
activities that we
can do protect our
environment?
• Make a medicinal plant garden
• Make a flower garden
• Make an eco park
• Creating environmental awareness
• Reduce the use of plastic materials
• The use of paper bag and ink pens
• Making posters and leaflets
• Cleaning the environment
• Conservation of water
.
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