List of top Biology Questions

A normal couple produces half the sons as haemophilic and half the daughters as carriers. Choose the option that correctly indicates the chromosome on which the gene for this trait is located.

Cistron is a segment of DNA coding for a :

In a pedigree chart, if two unaffected individuals have a child with the trait, what is the most likely mode of inheritance for this trait ?

How is triple fusion achieved in these plants ?

If a natural population with 200 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles A and a, and with the gene frequency of allele A of 0.8, the genotype frequency of Aa will be :

Select the statements that are true for a typical monocotyledonous embryo from the given options.
1. Scutellum is present towards the centre of the embryonal axis.
2. Embryonal axis of the lower end has radicle and root cap covered by coleoptile.
3. The portion of embryonal axis above the level of attachment of scutellum is epicotyl.
4. Shoot apex and few leaf primordia of embryo are enclosed in a hollow foliar structure.
Choose the correct answer from the following :

Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.

State any two criteria for determining biodiversity hotspots.

Describe the Species-Area relationship as observed by Alexander von Humboldt, for a wide variety of taxa in nature.

Describe how human insulin is produced using the techniques of genetic engineering.

Describe what is meant by downstream processing.

Explain the working of a simple stirred-tank bioreactor.

Explain how human pro-insulin is processed in the cell to become a fully mature functional insulin.

Name and explain the role of inner and middle walls of the human female uterus.

Explain the beneficial role of the following, produced as a result of the processes of biotechnology, to mankind:
(α) −1−antitrypsin

Explain the beneficial role of the following, produced as a result of the processes of biotechnology, to mankind:
Cow named Rosie

Write the location and function of fimbriae in human female.

State any two criteria for determining biodiversity hotspots

Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with the help of any two examples.

What do you mean by activated sludge in an STP?

Explain the biological treatment of the major part of the sludge transferred from the large aeration tank into the anaerobic sludge digesters before its final release into the natural water bodies.

If the birds have 18 pairs of autosomal chromosomes and a pair of sex chromosomes, fill in the blanks (i), (ii), (iii) and (iv) in the table given below. (Use symbols Z and W for sex chromosomes).

Many children in the metro cities are suffering from a very common exaggerated response of the immune system to certain weak antigens in the air. (i) What is the term used for the above mentioned disease?

What is the term used for the milk produced during the initial days of lactation?