List of top Biology Questions

Which of the following are producers in an ecological system?
Which of the following acts as wound hormones in plants?
The enriched media used to facilitate the growth of fastidious microorganisms are
Match the bacterial structure to function
(i)Cell wall(a)Virulence factor
(ii)Glycocalyx(b)Selective permeability
 (c)Attachment to surfaces
  (d)Protection from osmotic lysis
Identify the correct pairs:
(i) Thermophile            (a) grows optimal at 37 °C
(ii) Mesophile                 (b) grows optimal at low temperature
(iii) Psychrophile             (c) grows optimal at high saline conditions
(iv) Halophile                  (d) grows optimal at 67 °C
A single copy of an allele in sickle-cell heterozygous individuals reduces the frequency and severity of malaria. The reason for this is
How many meiotic and mitotic divisions occur during the development of male gametophyte from the microspore mother cell?
During replication of DNA, the separated strands are prevented from recoiling by using ______.

From the given diagram, identify the type of population growth curve:

Test tube baby technique is called ______.
______ hormone is responsible for efflux of K\(^+\) ions from guard cells and acts as an antitranspirant.
Which event is represented by the above diagram, related to chromosomal aberrations?

Match the parts of ovule given in column I with parts of seed given in column II: 

Match the antibiotics in column I with their microbial sources in column II: 

Match the following products with their microbial sources: 

Describe hormonal control in various phases of menstrual cycle.
Explain the law of dominance and compare how it differs from incomplete dominance and co-dominance.
State the names of hormone and glands secreting them:
With the help of neat and labelled diagrams, distinguish between artery and vein.
Describe outbreeding devices which encourage cross pollination.
Explain any three examples of biopiracy.
Explain the properties of nerve fibres.
Give the causative agent, mode of transmission and symptoms of typhoid.
Give the applications of DNA fingerprinting.
Write a note on In-situ and Ex-situ conservation.