Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Rahul introduced Ronit to his uncle and told him that Ronit is pursuing a course in biotechnology in America.
His uncle had never heard of this term earlier and was curious to know about this term. Ronit pointed towards a big tree at the base of which were present numerous tumour-like structures and said that this is the example of natural biotechnology:

1. What is biotechnology?
2. How these crown gall tumours are formed?
3. What are the values shown by Rahul's uncle?

Explain the cause of chromosomal disorders in humans. Describe the effect of such disorders with the help of an example each involving.

1. autosomes, and
2. sex chromosomes.

You have identified a useful gene in a bacteria. Make a flow chart of the steps that you would follow to transfer this gene to a plant.

Now, sequencing of total genomes getting is getting less expensive day by the day. Soon it may be affordable for a common man to get his genome sequenced. What in your opinion could be the advantage and disadvantage of this development?

The use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides.###Give an importance of virus include in genus neucleopolyhedro virus.###How microbes are useful as Biocontrol agents? Explain.

The length of a DNA molecule in a typical mammalian cell is calculated to be approximately 2.2m. How is the packaging of this long molecule done to accommodate it within the nucleus of the cell?

What will be the ploidy of the cells of the nucellus, microspore mother cell, the functional megaspore and female gametophyte?

Why do lepidoplerans die when they feed on Bt cotton plant? Explain how does it happen.

What is adaptive radiation? Explain with examples.

Double fertilisation is reported in plants of both, castor and groundnut. However, the mature seeds of groundnut are non-albuminous and castor are albuminous. Explain the post-fertilisation events that are responsible for it.