Ecosystems — BIOLOGY STD 12 Science — Question

Write any four differences between bacteria and cyanobacteria.

1. Name the stage of Plasmodium that gains entry into the human body.
2. Trace the stages of Plasmodium in the body of female Anopheles after its entry.
3. Explain the cause of periodic recurrence of chill and high fever during malarial attack in humans.

Answer the following questions:
What is meant by ADA deficiency? How is gene therapy a solution to this problem? Why is it not a permanent cure?

'Fertilisation is not an obligatory event for fruit production in certains plants'. Explain the statement.

How are solid wastes disposed of?

With the help of three examples, explain the broadly utilitarian argument for conservation of biodiversity.

A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.
OR
Following the collision of two trains a large number of passengers are killed. A majority of them are beyond recognition. Authorities want to hand over the dead to their relatives. Name a modern scientific method and write the procedure that would help in the identification of kinship.

Reproductive and Child Healthcare (RCH) programmes are currently in operation. One of the major tasks of these programmes is to create awareness amongst people about the wide range of reproduction related aspects. As this is important and essential for building a reproductively healthy society.

1. 'Providing sex education in schools is one of the way to meet this goal'. Give four points in support of your opinion regarding this statement.
2. List any two 'indicators' that indicate a reproductively healthy society.

Write a short note on Apomixis and polyembryony.

Write in what context did Darwin use the terms 'fitness', 'survival' and 'selection' while elaborating on the mechanism of evolution.