Organisms and Populations — BIOLOGY STD 12 Science — Question

How does addition of a small amount of curd to fresh milk help in the formation of curd? Mention a nutritional quality that gets added to the curd.

OR

How does ‘starter’ added to milk help it to set into curd?

What is repetitive DNA? Explain graphically the experiment of Alfred Hershey and Martha Chase that 'DNA is a genetic material'.

State the difference between simple stirred-tank bioreactor and sparged stirred-tank bioreactor. What are the advantages of these bioreactors?

Write any two benefits of producing genetically modified plants. Give an example of any one genetically modified plant.

How many primary follicles are left in each ovary at puberty?

What do you think is the significance of reproductive health in a society?

Explain the process of syngamy and double fertilization.

What is urethral meatus?

Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by micro organisms. Explain how the mechanism is useful for the organism producing the toxin?

Differentiate between the following:
Dominance and Recessive.