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Q1 Rearrange the boxes given below to make a sentence that helps us understand opaque objects. Ans: 
The objects from which light cannot pass through, are called opaque objects. When any opaque object comes in the path of light, then a dark structure is formed called shadow.
Q2 Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon. Ans: Opaque: A piece of rock, a CD, smoke, iron, an umbrella, a wall, a sheet of aluminium.
Transparent: Air, water, sheet of plane glass.
Translucent: A sheet of polythene, fog, a sheet of cellophone.
Luminous: A lightened fluorescent tube, flame of gas burner, a lighted torch, firefly, stove, sun, moon.
Non- luminous: A mirror, piece of rock, a wire mesh, iron, a wall.
- The objects through which lights cannot pass are called as opaque objects.
- Objects from which lights can pass easily and we can see clearly through them are called transparent objects.
- The objects from which lights can pass easily but we cannot see clearly are known as translucent objects.
- The objects which emits light are called as luminous.
- The objects which does not emit light are known as non- luminous objects.
Q3 Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way? Ans: Yes, a cylindrical shape is one which gives the circular shadow from one end and a rectangular shadow from another end.
Q4 In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror? Ans: No, in a complete dark room we cannot see the reflection in the mirror because reflection is the phenomenon of light. If there is no light then reflection does not occur there and we cannot see our image in the mirror.
Chapter 11 Light, Shadows and Reflections
- Objects around us are of different types.
- Some are opaque, transparent, translucent, luminous, non- luminous around us.
- The objects which emits light are called as luminous whereas, which does not emit light are known as non- luminous objects.
- The object in which the light can pass easily called as transparent whereas the objects from which lights can pass easily but we cannot see clearly are known as translucent objects.
- The objects through which lights cannot pass are called as opaque objects.
- When an object comes in the path of light then the dark structure is formed, called as shadow.
- Reflection may be defined as, when an objects send light back to its path, then an image is formed is known as reflection. For example: image in the mirror, shadow in water etc.
- Bright objects or images can be seen by a pinhole camera. It is made up of cardboard simply.
- Light travels in the straight line, that’s why when any object comes in its path, it makes shadow.
Download pdf of NCERT Solutions for Class Science Chapter 11 Light, Shadows and Reflections
Exercise 1 ( Page No. : 114 )
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Draw (a) a leaf, (b) a taproot and (c) a flower, you have studied for Table 7.3.
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Given below are the names of some objects and materials:
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(a) Round shaped and other shapes
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Name two items that are made from coconut fibre.
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Correct the following statements and rewrite them in your notebook.
(a) Stem absorbs water and minerals from the soil.
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(d) The number of petals and sepals in a flower is always equal.
(e) If the sepals of a flower are joined together, its petals are also joined together.
(f) If the petals of a flower are joined together, then the pistil is joined to the petal. - Q:-
If a plant has leaves with reticulate venation, what kind of roots will it have?
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In which part of a flower, you are likely to find the ovary?
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A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
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Write the names of the parts of a flower.
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If a plant has fibrous root, what type of venation do its leaves likely to have?
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Is it possible for you to recognize the leaves without seeing them? How?
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Which of the following leaves have reticulate venation?
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- NCERT Chapter