List of top Biology Questions

The origin of life according to the early Greek philosophers was transfer of unit of life from outer space to the different planets in the form of:
Embryo formation without fertilization is observed in some species of:
Work out a cross to explain how normal parents may have a sickle-cell anaemic child.
Explain the genetic basis that results in the expression of this disorder.
Why is sickle-cell anaemia, a human blood disorder, so named?
Explain the charging of an adaptor molecule. Why does this molecule need to be charged?
Write the initiating codon for translation, its anticodon, and the amino acid it codes for.
Identify the polarity from ‘X’ to ‘Y’ in the mRNA segment shown. Mention how many more amino acids can be added to the polypeptide that is being translated and why.
Describe the different steps in the sexual mode of reproduction in the life cycle of a malarial parasite from the time of its initiation till where it is completed and ready to start a fresh cycle.}
Write the symptoms of malaria in humans and explain what causes these symptoms.
Describe the life cycle of HIV from the time of its entry into the human body till full-blown AIDS sets in.
Draw a labelled diagram showing the different embryonic stages of a dicot plant, up to a fully mature embryo.
Why does endosperm development precede embryo development in angiosperm seeds? State the role of endosperm in mature albuminous seeds.
‘A proper understanding of the menstrual cycle can help immensely in family planning.’ Do you agree with the statement? Provide reasons for your answer.

Explain the following phases in the menstrual cycle of a human female: 
(1) Menstruation 
(2) Follicular phase 
(3) Luteal phase

Which of the two curves is relevant in present days with respect to human population in our country and why?
Which one of the two curves is more “realistic” and why?
Growth curve ‘B’ shows a different pattern from that of growth curve ‘A’. Justify giving one reason.
Mention what does the dotted line in the graph indicate and state its importance also.
Identify the growth curves ‘A’ and ‘B’.
Mention the difference in the site of transcription in a prokaryote and eukaryote cell.
Write the number of RNA polymerases involved in the transcription of DNA in a prokaryote and eukaryotes.
Name and explain the process the RNA molecule transcribed from 8000 nucleotide-long DNA undergoes to be able to translate a polypeptide of 400 amino acids.
Name this RNA product transcribed from the DNA that subsequently translates into a polypeptide of 400 amino acids. Mention the enzyme responsible for transcribing this type of RNA from the DNA.
Name the (i) ape-like (ii) man-like primates that existed 1.5 million years ago.