Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

When and where was the World Summit on sustainable development held? How many countries signed the convention? What was the objective?

Name the component cells of the ‘egg apparatus’ in an embryo sac.

Enlist various enzymes used in recombinant DNA technology?

Name two alcoholic drink produced in each of the following ways:

1. With distillation
2. without distillation

What is quarantine? Why is quarantine essential before introducing a plant species from another country?

What is a terminator? What is its significance in transcription?

The red spotted newt Notophthalmus viridescens secretes toxins from its skin that make predators avoid it. The red salamander Pseudotriton ruber has no such secretions but resembles the red spotted newt and gains protection from this resemblance. What is this an example of? Who is the model, the mimic, and the dupe?

A patient showed symptoms of constipation, abdominal pain and stools with excess mucus and blood clots. Name the disease and its pathogen. Where do these pathogens live in the victim's body? Name the mechanical carrier that transmits this pathogen.

How many nuclei are present in a fully developed male gametophyte of flowering plants?

If a fresh water fish is placed in an aquarium containing sea water, will the fish be able to survive? Explain giving reasons.