Ecosystem — BIOLOGY STD 12 Science — Question

Who is surrogate mother ?

What is Interspecific interaction? Represent it in the form of table.

How is the milk production regulated by hormones in human female ? Explain.

How is the name given to restriction endonuclease.

Human activities interfere with carbon cycle. List any two such activities.

Describe how biotechnology has helped in producing more nutritionally balanced milk. Write the full forms of the following:

1. GEAC
2. PKU

A new type of drug, PTC 124, enables translation to continue through the nonsense codon. Trials in mice homozygous for a CFTR allele containing the nonsense codon have found that animals treated with PTC 124 produce normal CFTR protein in their cells. The drug is taken orally and is readily taken up into cells all over the body.
Using your knowledge of the progress towards successful gene therapy for cystic fibrosis, suggest why PTC 124 could be simpler and more reliable treatment for this disease.

What measures will you take to prevent the spread of water borne diseases?

Differentiate between the following: Homozygous and Heterozygous

What is the source of energy in ecosystem. Explain the structure of the energy pyramid in an ecosystem with the help of a diagram.