List of practice Questions

If $\sin A , \sin B , \cos A$ are in GP, then roots of $x ^{2}+2 x \cot B +1=0$ are always
In Chlamydomonas the meiosis occurs in :
Negatively geotropic roots are found in
Algae which form motile colony is
First vascular plant group is
Which pteridophyte is called horse-tail ?
Dominant generation in bryophytes is
Selaginella leaf possesses an adaxial out growth proximally
Having capacity of absorbing water, used to replace cotton and used as fuel
The edible dry fruit 'Chilgoza' is
Pteridophytes are also called
The integument of Cycas ovule is hard on account of
To which of the groups would you assign plant lacks ovules and reproduces by means of spores ?
A typical gymnospermous plant has 8 chromosomes in leaf cells. What will be number of chromosomes in the cells of the gametophyte ?
The pigment phycoerythrin is characteristic of
During fertilization in ferns, male gamete reaches the female gamete through the agency of
Fucoxanthin is present in
In gymnosperms how many male gametes are produced by each pollen grain ?
Which of the following is known as `resurrection plant??
Most primitive members in which roots are not present, is :
Law of multiple proportions is illustrated by one of the following pairs:
The amount of calcium carbonate that reacts with 500 cc of 0.5 N hydrochloric acid is
On reduction with hydrogen, $3.6\, g$ of an oxide of metal left $3.2\, g$ of metal. If the vapour density of metal is $32$, the simplest formula of the oxide would be
Two identical metal spheres with charges $2Q$ and $-Q$ are separated by a distance. Force between them is F. They are connected by a conducting wire and then removed. Force between them now is
A charged ball $B$ hangs from a silk thread $S$, which makes an angle $\theta$ with a large charged conducting sheet $P$, as shown in the figure. The surface charge density $\sigma$ of the sheet is proportional to: