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How many vertical columns are there in the modern periodic table and what are they called?
There are 18 vertical columns in the modern periodic table and they are called as ‘Groups’.
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What is speciation ?
Speciation is the evolutionary process, involving the generation of one or more species from an existing species.
Why should biodegradable and non-biodegradable wastes be discarded in two separate dust bins?
Biodegradable and non-biodegradable should be discarded in two separate dust bins because when they are dumped together, they mix and make the biodegradable wastes unfit for recycling and also form toxic compounds which cause pollution.
“A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw labelled ray diagram to justify the statement.
The figure below illustrates the phenomenon refraction of a ray of light passing through a glass prism.
EF is the incident ray and GH is the emergent ray which is parallel to the incident ray.
“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement.
In sexually reproducing parents, the gametes have half the number of chromosomes and DNA that is they are haploid. These gametes i.e. sperms and ova fuse at the time of fertilisation to form zygote and thus restore the chromosome number or the diploid condition. Thus the parents and the offspring have the same number of chromosomes.
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Mock Test Series
