Ecosystems — BIOLOGY STD 12 Science — Question

How many neurons are present in the brain?

Define the following : Parasite

Give an example of a plant, where the F, progeny of a monohybrid cross has the same genotypic and phenotypic ratios.

The accessibility of promoter region of prokaryotic DNA is often regulated by the interaction of a protein with a certain sequence of DNA. What name is given to such a DNA sequence?

Biocontrol or biological control:

A boy of ten years had chickenpox. He is not expected to have the same disease for the rest of his life. Mention how it is possible.

How do plants carry out control and coordination?

Indian poultry breeds.

Agenetic disorder is transferred from a phenotypically normal, but a carrier female to some of her sons. What is the nature of the disease?

Write the names of hormones and the glands secreting them for the regulation of Heartbeat and blood pressure.