Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.
Stage 1: Egg The egg is laid by a female moth, which is mostly the size of small dots. A... View Article
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Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
When all the parallel rays reflected from a plane surface are not parallel, the reflection is known as diffused or... View Article
A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?
When the iron is heated it gets softened. A blacksmith hammers on the hot iron, he applies force. This applied... View Article
Which of the things in the following list are nonliving? Plough, Mushroom, Sewing machine, Radio, Boat, Water hyacinth, Earthworm
Non-living things are plough, sewing machine, radio, and boat. On the other hand, mushrooms, water hyacinth, and earthworms are living... View Article
Mark ‘T’ if the statement is true and ‘F’ if it is false: Water from rivers is the only source for irrigation in the fields. (T/F)
True. Water from rivers is the only source for irrigation in the fields. Water from rivers is the only source... View Article
Mark ‘T’ if the statement is true and ‘F’ if it is false: We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
We can obtain a real, enlarged and inverted image by a concave mirror. (True) Explanation A concave mirror is a... View Article
A virtual image larger than the object can be produced by a (i) concave lens (ii) concave mirror (iii) convex mirror (iv) plane mirror
A virtual image larger than the object can be produced by a concave mirror. Explanation Concave mirrors produce real and... View Article
During heavy exercise, we get cramps in the legs due to the accumulation of (i) carbon dioxide (ii) lactic acid (iii) alcohol (iv) water
During heavy exercise, we get cramps in the legs due to the accumulation of (ii) lactic acid Explanation The cramps... View Article
Mark ‘T’ if the statement is true and ‘F’ if it is false: Water shortage is a problem faced only by people living in rural areas. (T/F)
False. Water shortage is not a problem faced only by people living in rural areas. Water storage problem is faced... View Article
If the sepals of a flower are joined together, its petals are also joined together. Correct the following statement and rewrite it.
If the sepals of a flower are joined together, then its petals may or may not be joined together. Explanation... View Article
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
The needle of a compass is a tiny magnet, which points in the north-south direction. When a magnet is brought... View Article
If the petals of a flower are joined together, then the pistil is joined to the petal. Correct the following statement and rewrite it.
If the petals of a flower are joined together, then the pistil is not necessarily joined to the petal. Explanation... View Article
Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
Materials required a drawing board a white sheet of paper a few common pins and a plane mirror. Procedure Pin the... View Article
Using the “conduction tester” on an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.
Yes, the given object is a conductor, as it allows the electric current to pass through it and causes the... View Article
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?
Yes, a cylindrical shape is the one that would give a circular shadow if held in one way and a... View Article
Mark ‘T’ if the statement is true and ‘F’ if it is false: Plants carry out photosynthesis only during the day and respiration only at night.
Plants carry out photosynthesis only during the day and respiration only at night. (False) Explanation Plants respire all the time,... View Article
Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a droplets of water around it. Why?
This is because water vapour present in air collide with the surface of cold water bottle which and condenses into... View Article
Out of the following, which are the two terms related to silk production? Sericulture, floriculture, moriculture, apiculture and silviculture.
Sericulture, moriculture are the terms related to silk production. Explanation Moriculture can be defined as the process of cultivating mulberry... View Article
Is it possible for you to find out whether a plant has taproot or fibrous roots by looking at the impression of its leaf on a sheet of paper?
Yes, we can find out whether a plant has tap root or fibrous roots by looking at the impression of... View Article
Choose the most appropriate answer. Internal fertilisation occurs (i) in female body. (ii) outside female body. (iii) in male body. (iv) outside male body.
(a) Internal fertilization occurs – (i) in the female body. Internal fertilization is a type of sexual fertilization. It is... View Article
