Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Given below are the events that are observed in an artificial hybridization programme. Arrange them in the correct sequential order in which they are followed in the hybridisation programme.
(a) Re-bagging (b) Selection of parents (c) Bagging (d) Dusting the pollen on stigma (e) Emasculation (f) Collection of pollen from male parent.

What does ‘competent’ refer to in competent cells used in transformation?

A moss plant is unable to complete its life-cycle in a dry environment. State two reasons.

Even if a character shows multiple allelism, an individual will only have two alleles for that character. Why?

A mature embryo-sac in a flowering plant may possess 7-cells, but 8-nuclei. Explain with the help of a diagram only.

Explain the interdependence of producers and consumers.

Effluent from the primary treatment of the sewage is passed through large aeration tanks for biological treatment.
Explain the complete process that follows till the water is ready to be released into the natural water bodies.

What is cross breeding? What advantages does it confer? Give one example.

Would it be appropriate to use DNA probes such as VNTR in DNA finger printing of a bacteriaphage?

What does the term genetic diversity refer to? What is the significance of large genetic diversity in a population?