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.


30. All organisms

 need certain factors

 to live. Which are 

they ?


• AIR 
• WATER 
• SUNLIGHT
• SOIL 

All these are abiotic factors


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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