List of top Biology Questions

Cartilaginous fishes belong to the class
To which of the following category dinosaurs belong ?
Phytol chain is present in
First stable product of C plants is
Skin is said to play an important role in excretion due to presence of
Bakanae disease was due to
Stomata open in the daytime due to
Which of the following is a distinct character ?
One of the following is a distinct feature of birds
Cyclin protein is required for cell cycle. Which other molecule is essential for completion of cell cycle ?
"Bt" toxin is
Which of the following statements is true ?
Which is the most distinct character of fishes ?
Blastula of frog is:
The outermost layer of exine of a pollen grain is made up of
Based on cellular mechanisms there are two major types of regeneration found in the animals. Which one of the following is the correct example of the type mentioned?
In humans, the gamete contributed by the male determines whether the child produced will be male or female. Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X$-chromosome and some on $Y$-chromosome.
The family containing mustard and its main characters are
Three of the following statements regarding cell organelles are correct while one is wrong. Which one is wrong?
Which one of the following four secretions is correctly matched with its source, target and nature of action?
Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans. The trait traced in the above pedigree chart is
A young drug addict used to show symptoms of depressed brain activity, feeling of calmness, relaxation and drowsiness. Possibly he was taking
In which one of the following would you expect to find glyoxysomes ?
Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in $F_2$ generation what proportion of the progeny is likely to resemble either parent?
Which of the following produces red tide in sea ?