Biodiversity, Conservation and Environmental Issues — BIOLOGY STD 12 Science — Question

Explain the ill-effects of opioids and cannabinoids on health.### What are harmful effects of drug abuse?

Rearrange Ramapithecus, Australopithecus and Homo habilis in the order of their evolution on the Earth. Comment on their evolutionary characteristics.

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.

What is agamospermy? How is agamospermy different from parthenogenesis and parthenocarpy?

1. What makes some viruses to cause cancer in humans?
2. How do benign tumours turn malignant? How does the latter harm the human body?

Explain unique features of acquired immunity.

Fertilization.

‘Fertilisation is not an obligatory event for fruit production in certain plants’. Explain the statement.

How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidogyne incognita?

1. What do ‘Y and ‘B’ stand for in ‘YAC’ and ‘BAC’ used in Human Genome Project (HGP)? Mention their role in the project.
2. Write the percentage of the total human genome that codes for proteins and the percentage of discovered genes whose functions are known as observed during HGP.
3. Expand ‘SNPs’ identified by scientists in HGP.