Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Explain the laws that Mendel derived from his monohybrid crosses.

What are biofertilizers? Name the two elements which are made available by them.

Ram saw a farmer spraying some chemicals on flowers. On asking farmer, he came to know that this act will lead to the formation of fruits without fertilisation. Ram thought that fruits developed in this way are not good to eat as chemicals are sprayed on it.
Next day, he asked his biology teacher about it, who explained him everything.

1. What chemicals were sprayed by the farmer?
2. Give difference between such a spray and usual pesticide spray?
3. What is parthenocarpy? Give its types.
4. What values are shown by Ram?

1. Write the palindromic nucleotide sequence for the following DNA segment:

5' - GAATTC - 3'

2. Name the restriction endonuclease that recognises this sequence.
3. How are 'sticky ends' produced? Mention their role.

Draw the sketches of a zoospore and a conidium. Mention two dissimilarities between them and at least one feature common to both structures.

A colour blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.

Inheritance pattern of ABO blood groups in humans shows dominance, codominance and multiple allelism. Explain each concept with the help of blood group genotypes.

Mention the role of (i) selectable marker, (ii) Ori and (iii) rop in E.coli cloning vector, pBR 322.

State the significance of pollination. List any four differences between wind pollinated and animal pollinated flowers.

Prabha has seen huge garbage dumps outside your school which are not being regularly disposed of by MCD. Prabha discusses the problems with school mates and decide to organize rally to spread awareness among local people about public hygiene.
→ Prepare two slogans for rally
→ Name any two infectious diseases which may spread due to such unhygienic conditions at public place