Luminous & Non-luminous object
Point at 5 non-luminous objects
Light travels in a..... line.
straight
A ray of light that comes to a surface is called an .....
incident ray
Name 5 plants you know
Name 10 animals you know.
Write 3 luminous objects
Light does not travel in a...... line.
curved
Reflected ray
Most plants can move. True or False?
False
What do animals need for breathing?
Oxygen
Luminous objects..... by themselves.
emit light
Complete the words:
R_C_I_ _N_ _R PR_P_G_T_ _N
RECTILINEAR PROPAGATION
The angle of incidence is bigger and the angle of reflection. True or False?
False
In plants, energy is stored as.....
starch
Why do animals live together?
To help each other find food, fight against predators and care for the young ones.
What do non-luminous objects do?
Reflect light
In which medium does light travel in a straight line?
Homogenous transparent medium
Compare the distances from a plane mirror to the image and the object.
Same
Explain why cactus can survive in the desert.
Tiny leaves
Slow growth
Big stems
Most reptiles can ........... so that ............ can not recognize them.
camourflage - predators
Can a light bulb be both a luminous and non-luminous object? Explain.
Luminous when it's switched on and non-luminous when its switched off.
You can hear the sound of thunder before you see lightning. True or False?
False
The image is r......... and has the s..... s..... as the object.
reversed - same size
Explain why lotus can live in the water.
Very thin roots.
Leaves floating on or growing above water to get sunlight.
Name 5 ways of adaptations animals use to survive.
Live together - Fly - Camourflage - Hibernate - Store water