Is deforestation associated with global warming? Explain.
Forests serve as a carbon sink by absorbing atmospheric carbon dioxide during photosynthesis. Since carbon dioxide is a greenhouse gas,... View Article
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Oxygen is an exhaustible natural resource. (True or False)
False Oxygen in air is an inexhaustible natural resource, as it is present in unlimited quantity in nature and cannot... View Article
Why does Mathura refinery pose problems to the Taj Mahal?
he Mathura oil refinery is located at Mathura in Uttar Pradesh. It is a refinery of Indian Oil which procedures... View Article
How can we say that fish exhibits external fertilisation?
External fertilization in an aquatic environment protects the eggs from drying out. Female fish releases eggs into water and male... View Article
Fossil fuels can be made in the laboratory. (True or False)
Fossil fuels can be made in the laboratory. False Fossil fuels are made from decomposing plants and animals. These fuels... View Article
Why is AIDS considered to be a ‘Syndrome’ and not a disease?
Syndrome means a group of health problems that make up a disease. AIDS (Acquired Immune Deficiency Syndrome) is not one... View Article
Non-flowering plants are called Cryptogamae. (True or False)
True Explanation Plants belonging to Division Thallophyta, Bryophyta and Pteridophyta do not produce flowers. Their structures for sexual reproduction are... View Article
All prokaryotes are classified under Monera. (True or False)
True Explanation In five kingdom classification all prokaryotes, that is, unicellular organisms without a well-defined nucleus are grouped under Monera.... View Article
Pteridophyta do not have (a) root (b) stem (c) flowers (d) leaves
(c) flowers Explanation Pteridophyte is one of the older groups of plants present in the Plant kingdom, which have evolved... View Article
How is a bacterial cell different from an onion peel cell?
Bacterial cells are primitive cells hence, called as prokaryotic cells. They do not possess membrane bound organelles as mitochondria, lysosomes,... View Article
Name two gases which are mainly responsible for acid rain?
(i) Sulphur dioxide (ii) Nitrogen dioxide Acid Rain as the name suggests can be said to be the precipitation of... View Article
Write the characteristics and some important uses of coal.
Coal is black and hard as stone. It is one of the fuels used to cook food. Earlier, it was... View Article
Wildlife is an exhaustible natural resource. (True or False)
True They are limited in number and can be exhausted as a result of human activities, so it is a... View Article
Coal tar is a mixture of various substances. (True or False)
True Explanation It is obtained as a by-product in the process of making coke. Though its colour is the same... View Article
How is reproduction in hydra different from that in amoeba?
Amoeba is a unicellular organism that has the ability to change its shape. They are usually found in water bodies... View Article
Explain why fossil fuels are exhaustible natural resources.
Fossil fuels are formed from the dead remains of living organisms. The formation of fossil fuels is a very slow... View Article
Plants have low energy needs as compared to animals. Explain.
In plants, the movements are usually at the cellular level and hence a far less amount of energy is required... View Article
Association between blue-green algae and fungi is called as___.
Lichens Explanation Lichen is the association between blue-green algae and fungi. Both the partners benefit from this relationship hence, it... View Article
Amoeba and Paramecium belong to which category of organisms?
a) Protozoa Protozoa are unicellular, eukaryotic, heterotrophic organisms. They are either free-living or parasites. There are around 65000 species of... View Article
How does deforestation lead to frequent floods and droughts?
Deforestation results in decreased water holding capacity of soil. This reduces the infiltration of water into the ground, which causes... View Article
