Human Health and Diseases — BIOLOGY STD 12 Science — Question

Give definition: Double fertilization

How biofortified crops are produced?

In what way are monocytes a cellular barrier in immunity?

Chemical stimulant of low temperature effect on flowering of plants.

Suggest the breeding method most suitable for animals that are below average in milk productivity.

Name a human disease, its causal organism, symptoms (any three) and vector spread by intake of water and food contaminated by human faecal matter.

Name the specific components and the linkages between them that form deoxyguanosine.

Directions: In the following questions, the Assertions (A) and Reason(s) (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: PCR can detect very low amounts of DNA and is now routinely used to defect HIV in suspected AIDS patient.
Reason: PCR is a powerful technique to identify many other genetic disorders.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Who discovered blood circulation in humans?

Gene therapy has been successful in curing genetic diseases in laboratory animals through:

1. Exposure to X-ray to rectify the defective gene
2. Replacing the defective gene with a functional gene
3. Oral delivery of genes
4. Use of therapeutic medicines to rectify the defective gene