Question Bank [2022] — BIOLOGY STD 12 Science — Question

Name and explain the surgical method advised to human males and females as a means of birth control. Mention its one advantage and one disadvantage.

With the help of a chart, explain the compatibility of human blood groups.

What is the basic cause of pollution?

1. Define pioneer species.
2. Among bryophytes, lichens and fern, which one is a pioneer species in a xeric succession? And why?

Construct an ideal pyramid of energy when 10,00000 J of sunlight is available. Label all its levels.

Sketch and label formation of typical spinal nerve.

During a fire in an auditorium, a large number of assembled guests got burnt beyond recognition. Suggest and describe a modern technique that can help hand over the dead to their relatives.

How do organisms like fungi, zooplanktons and bears overcome the temporary short-lived climatic stressful conditions? Explain.

What is sewage? Describe its composition

What is allergy? Name the antibody responsible for it. Also mention two chemicals released from the mast cells during an allergic reaction.