Evolution — BIOLOGY STD 12 Science — Question

Community service department of your school plans a visit to a slum area near the school with an objective to educate the slum dwellers with respect to health and hygiene.

1. Why is there a need to organise such visits?
2. Write the steps you will highlight as a member of this department, in your interactions with them to enable them to lead a healthy life.

Explain what is the difference between the theory of De Vries and Lamarck

What are selectable markers? Give examples.

AtRNA is charged with the amino acid methionine.

1. Name the process involved in attachment.
2. Point out the mRNA codon and anticodon on tRNA for this amino acid.
3. Name the enzyme responsible for this attachment.

State the views of Oparin and Haldane on evolution. How does S.L. Miller's experiment support their views?

OR

1. Explain the theory of abiogenesis.
2. How did Miller demonstrate experimentally the chemical evolution that happened three billion years ago?

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.

Draw a labelled sketch of sparged-stirred-tank bioreactor. Write its application.

Defferentiate between: (b) coleoptile and coleorrhiza

How are eurythermal animals different from stenothermal animals? Give an example of each.

Write a short note on viability of seeds.###How long do the seeds remain alive after they are dispersed?