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

Write the important features of sedimentary cycle in an ecosystem

Draw a labelled diagram – Working of lac operon.

If implementation of better techniques and new strategies are required to provide more efficient care and assistance to people, then why is there a statutory ban on amniocentesis? Write the use of this technique and give reason to justify the ban.

Define biofertilizers. Give two types of fungal biofertilizers.

Why is secondary immune response more intense than the primary immune response in humans?

Why is Agrobacterium-mediated genetic transformation described as natural genetic engineering in plants?

Draw a yeast cell reproducing by budding and show the following labels in it:

1. Bud.
2. Parent cell.
3. Nucleus of bud.
4. Nucleus of parent cell.

Why do people suffer from altitude sickness after reaching the high altitude regions? How does their body get acclimatized after a couple of days?

What are gibberellins? Give the applications of gibberellins.

Give the floral adaptations for chiropterophily.