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

The ……………… contains the egg or ovum.

Two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Assertion: Agrobaderiurm tumefaciens is called natural genetic engineer.
Reason: Agrobacterium tumefaciens infects all broad-leaved agricultural crops but does not infect cereal crops.

Euro II norms stipulate that sulphur be controlled at ____________________ in diesel.

De Vries believed that single step large mutation, called caused speciation.

In a logistic growth curve, the final phase is an .

Complete the following sentences given below:

1. The first mammals arose alongwith .
2. The direct ancestor of modern man is .
3. Primitive man who used stones to produce fire is .

Sperm fertilizes ovum in the ……………….. of fallopian tube.

_______ are the E.coli enzymes that remove the nucleotides from the ends of DNA strands.

______________ gas is continuously produced by the action of UV rays on molecular oxygen.

When the enzyme ______ is inactivated in E.coli, the transformants do not produce any colour in the presence of a chromogenic substrate.