Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

If the Tropical rainforest would have been from the present 6% areas of earth to 12% areas how would the biodiversity be affected by it? Explain with reason.

1. A short length of a DNA molecule contains 120 adenine and 120 cytosine bases. What is the total number of nucleotides in that DNA fragment?
2. A DNA contains 20,000 base pairs. How many nucleotides would be present in it?

Why is it essential that tRNA binds to both an amino acid and an mRNA codon during protein synthesis?

Draw a vertical section of maize grain and label its endosperm, plumule, coleoptile, scutellum, radicle and coleorhiza.

1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
2. If the advise is not followed by the patient there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body.

Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

A patient showed symptoms of sustained high fever, stomach pain and constipation, but no blood clot in stools. Name the disease and its pathogen. Write the diagnostic test for the disease. How does the disease get transmitted?

How is the translation of mRNA terminated? Explain.

Millions of chicken were killed in West Bengal, Assam, Orissa and Maharashtra recently. What was the reason?

Differentiate between a zoospore and a zygote.

Name the type of immunity the colostrum provides to a newborn baby. Write giving an example where this type of immunity should be provided to a person.