Human Health and Disease — BIOLOGY STD 12 Science — Question

Explain with example how transformed host cells are selected from non- transformed?

What are the three types of RNA? Mention their relation to protein synthesis.

A team of students are preparing to participate in the interschool sports meet. During a practice session, you find some vials with labels of certain cannabinoids.

1. Will you report to the authorities? Why?
2. Name a plant from which such chemicals are obtained.
3. Write the effect of these chemicals on human body.

Waste disposal and waste management poses a major problem in present times. Generation of garbage and its disposal is a major threat and consequently leads to severe environmental issues. The problem is not with biodegradable and recycled wastes. We realise that the need is to reduce non-biodegradable wastes.

1. Why is there a great concern of managing non-biodegradable waste in comparison to biodegradable waste? Explain.
2. As a member of eco-club of your school, suggest any two ways that you will discuss with your fellow members to organise for a 'Zero garbage day' once in a month in the school.

Given reasons : Only a fraction of sunlight is used for photosynthesis.

Draw a labelled sketch of sparged-stirred tank bioreactor. Write its application.

According to the 10% law given by Lindeman, only 10% of the energy is transferred to the next trophic level.

1. Name the process by which an organism produces energy.
2. What is the most common substrate used in this pathway?
3. Which biomolecule is also known as energy currency of the cell?

Australopithecus is described as a man with ape brain.

Enlist the different parts of the brain.

Systolic blood circulation and Diastolic blood circulation.