Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

What are the three major kinds of impurities in domestic wastewater?

Give two reasons for keeping beehives in crop fields during flowering periods

What is the role of foetus in inducing parturition?

DNA is unzipped twice in a cell. Mention the two events and the enzymes responsible for it.

Mention any two developments in human which helped him to move around safely on land.

Write down the ploidy of the cell of microspore tetrad.

Classify the following diseases under the headings 'transmissible and 'non-transmissible'. Lung cancer, whooping cough, rickets, arthritis, appendicitis, food poisoning, tuberculosis, measles, diabetes, anaemia, syphilis, influenza, AIDS, coronary heart disease and haemophilia.

Sketch and label process of formation of beads on strings/fibres from chain of nucleosomes.

Why do bottled juices appear clearer?

Is it possible to achieve ‘zero population growth rate’? If yes, what kind of age pyramid is obtained?