Human Health and Disease — BIOLOGY STD 12 Science — Question

Mention the name of the causal organism, symptoms and the mode of transmission of the disease Amoebiasis.

Haemophilia and sickle-cell anaemia are blood related Mendelian disorders. Yet, they differ in their pattern of inheritance. Explain the difference.

Co-evolution is a spectacular example of mutualism between an animal and a plant. Describe co-evolution with the help of an example.

Explain the following with reference to drug/alcohol abuse:

1. Addiction.
2. Dependence.
3. Withdrawal symptoms

F₁ progeny of pea plant bearing violet flowers and snapdragon plan bearing red flowers were selfed to produce their respective F₂ progeny. Compare the phenotypes, the genotypes and the pattern of inheritance of their respective F₂ progeny.

(a) Write the conclusions drawn by Alexander von Humbolt based on his extensive exploration of South America.
(b) Study the graph given below :

According to Alexander von Humbolt, what do the symbols S, A, C, and Z used in graphs indicate in the context of a species and region relationship?

What is the important of Spirulina as a food?

Alien species invasion has been a threat to biodiversity. Justify with the help of a suitable example. List any other three causes responsible for such a loss.

1. A tRNA is charged with the amino acid methionine.

1. Name the process involved in the attachment.
2. Point out the mRNA codon and anticodon on RNA for this amino acid.

2. What is heterochromatin?

Which three options could be thought for increasing food production?