According to de-Vries what is saltation?

Excessive nutrients in a fresh water body cause fish mortality. Give two reasons

Suggest the breeding method most suitable for animals that are below average in milk productivity.

State a difference between gene and an allele.

Sugggest a technique to a researcher who needs to separate fragments of DNA.

Explain the significance of meiocytes in a diploid organism.

7.

Mention the kind of biodiversity of more than a thousand varieties of mangoes in India represent. How is it possible?

List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. 

Discuss the role the enzyme DNA ligase plays during DNA replication.

Name the causative organism of the disease amoebiasis. List three symptoms of the disease.