Page 8 - E book prim 4
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Delta Modern Language Schools
Science department
Grade 4
1st term 2024-2025
Unit (1) concept (2)
Senses at work
o All living organisms receive stimuli from environment and make responds to them.
o Stimuli such as: hot and cold, hungry, smooth and rough.
o Five senses: hearing – sight – touch – taste – smell.
o Sensory organs: ears, eyes, skin (hand), tongue and nose.
Using senses in different animals (Nocturnal animals)
Dolphins Owl Jerboa Bats
Use echolocation to 1- It has extra ordinary sight 1-It is a desert rodent. They use echolocation using
2- It has long hind legs. sound waves to find their food
detect the location of its and hearing. 3- It has feet and toes. (insects).
2- It has bowl-shaped faces 4- It has large ears.
prey.
and feathers.
3- It can rotate its head in all
directions.
Human Nervous system
Brain Spinal cord Nerves
It is the main control Carry messages from Carry messages from
center in your body brain to body and brain to body and
from body to brain from body to brain
Reaction time:
It is the time taken by an organism’s body to react to
different stimuli.
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