Human Health and Disease — BIOLOGY STD 12 Science — Question

A mother of one–year old daughter wanted to space her second child. Her doctor suggested CuT. Explain its contraceptive actions.

What does the base tier of the ecological pyramid represent?

Name the important steps in the process of decomposition.

Name the technique used for separating DNA fragments in the laboratory.

Name the Part of the flower which the tassels of corn cob represent.

Very small animals are rarely found in polar regions. Give two reasons.

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters. Name the type of cross.

All primary productivity is not available for herbivores. Give one reason.

Name the seeds that have retained their viability for thousands of years.

Pea flowers produce assured seed sets. Give a reason.