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CBSE Notes 2011-2012 » X-Science-Term2

Light - Reflection and Refraction

The number of pair (s) of sex chromosomes in the zygote of humans is

Multiple choice question

The number of pair (s) of sex chromosomes in the zygote
of humans is

The theory of evolution of species by natural selection was given by

Multiple choice question

The theory of evolution of species by natural selection was
given by

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fl...

Multiple choice question

Some dinosaurs had feathers although they could not fly
but birds have feathers that help them to fly. In the context
of evolution this means that

Select the statements that describe characteristics of genes : (i) Genes are specific sequence of ba...

Multiple choice question

Select the statements that describe characteristics of genes :
(i) Genes are specific sequence of bases in a DNA
molecule
(ii) A gene does not code for proteins
(iii) In individuals of a given species, a specific gene
is located on a particular chromosome
(iv) Each chromosome has only one gene

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tali plants to...

Multiple choice question

In peas, a pure tall plant (TT) is crossed with a short plant
(tt). The ratio of pure tali plants to short plants in F2 is

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl...

Multiple choice question

A 10 mm long awl pin is placed vertically in front of a
concave mirror. A 5 mm long image of the awl pin is formed
at 30 cm in front of the mirror. The focal length of this
mirror is

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