List of top Biology Questions

The following diagram indicates the reflex arc. Identify the parts labelled as A,B,C,D,E,F and G. Choose the correct option
How many human teeth appear twice during the life span of an individual ?
If a germ cell in a female gonad and a germ cell in a male gonad begin undergoing meiosis simultaneously, what will be the ratio of ova and sperms produced ?
An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the :
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5sons).Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease?
In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype
A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:
Genes for cytoplasmic male sterility in plants are generally located in
More than 70% of world's freshwater is contained in
Which of the following pairs is correctly matched ?
An acromion process is characteristically found in the :
$9th$ pair of cranial nerve in frog is :
Chlorophyll in chloroplasts is located in
Centromere is required for
The main organelle involved in modification and routing of newly synthesized proteins to their destinations is:
Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter ?
There are two opposing views about origin of Modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variations of DNA however suggested African origin of Modem man. What kind of observation on DNA variation could suggest this?
Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used :
Which of the following is the relatively most accurate method for dating of fossils ?
At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium ?
A child with mother of blood group A and father of blood group AB, will not have which of the following blood group?
In contrast to annelids the Platyhelminthes show
The site of EMP pathway of breakdown of glucose in a cell, is
The pyramid of energy is always upright for any ecosystem. The situation indicates the fact that............
Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells of the following. Which of the cells are least likely to be replaced by new cells?