It is risky to wear synthetic clothes while working in the kitchen. (True or False)
All synthetic fibres are prepared by using raw materials of petroleum origin. Synthetic fibres catch fire easily. On heating, synthetic... View Article
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Plastic articles are available in all possible shapes and sizes. Can you tell why?
Plastic is easily moldable, so the articles can be made in any shape and size. Plastic is defined as a... View Article
Why does water need conservation even though large oceans surround the landmasses?
Marine water is unfit for consumption by humans, industries or land plants or animals. Therefore, terrestrial biota and human beings... View Article
Water which is suitable for _________ is called ________ water. (washing, bathing, drinking, potable, soft).
Water that is suitable for drinking is called potable water. Potable water is the water which is filtered and treated... View Article
we should avoid taking medicines drugs unless prescribed by a doctor
We should not take medicines/drugs unless agreed by a doctor because some medicines may have adverse side effects on our... View Article
Why are wildlife sanctuaries important for the conservation of plants and animals?
A wildlife sanctuary is an area where animal habitats and their surroundings are protected from any sort of disturbance. The... View Article
Coal and petroleum are formed from the dead remains of organisms and are known as __________.
Coal and petroleum are formed from the dead remains of organisms and are known as fossil fuels Coal and petroleum... View Article
Name any two sources which cause air pollution due to suspended particulate matter.
Suspended particulate matter or SPM are fine solids or liquids particles that may be dispersed through the air because of... View Article
In leaves, name the cell organelle and pigment that is responsible for green colour.
a) Chloroplast, chlorophyll Chlorophyll They are fat-soluble organic molecules having tetra pyrrole ring, hence referred to as the “Tetrapyrrole pigments... View Article
When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire.
When the clothes of a person catch fire, the person is covered with a blanket to extinguish the fire. Explanation... View Article
Cultivation practices and crop yield are related to environmental condition. Explain.
Crops are grown under different conditions. There are many factors that affects the crop yield and their growth. Some require... View Article
We should plant trees and nurture the ones already present in the neighbourhood. Why?
Of course, planting trees and nurturing is also good for the environment. They filter the air, replacing carbon dioxide with... View Article
The phenomenon of marble cancer is due to (a) soot particles (b) CFCs (c) fog (d) acid rain
The phenomenon of marble cancer is due to acid rain. i.e. presence of calcium carbonate in the acid rain. The... View Article
Write an activity to show that synthetic fibres are stronger than the cotton fibres.
Activity Take an iron stand with a clamp and a cotton thread of about 65 cm length. Tie the thread... View Article
Why do not lichens occur in Delhi whereas they commonly grow in Manali or Darjeeling?
Lichens are bioindicators of air pollution. They are highly sensitive to sulphur dioxide (SO2) pollution in air from automobiles and... View Article
Living organisms carrying the infecting agents from one person to another are called ______.
Living organisms carrying the infecting agents from one person to another are called Vectors. Explanation Vector is an organism that... View Article
Differentiation in segmental fashion occurs in (a) Leech (b) Starfish (c) Snails (d) Ascaris
a)Leech Leeches lead a parasitic mode of life, by sucking the blood of vertebrates. The three Jaws, inside the mouth,... View Article
Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.
Parenchyma Sclerenchyma Consists of living cells Consists of dead cells Consists of thin walled cell Consists of uniformly thickened cellwalls... View Article
What is the unique feature of the biodiversity found in Panchmarhi Biosphere Reserve?
The biodiversity found in Pachmarhi Biosphere Reserve is indistinguishable from those of the upper Himalayan peaks and all those belonging... View Article
The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene
Rayon is a type of fibre that can be changed into other fibres easily. Moreover, its properties are similar to... View Article
