Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Explain: Microbes are omnipresent.

Write a brief note on following phase of menstrual cycle. (i) Menstrual phase. (ii) Follicular phase / Proliferative phase (iii) Ovulatory phase (iv) Luteal phase / Secretory phase.

Prior to industrialisation, there were far more white winged moths on trees than melanised moths in England. However, after industrialisation, the distribution pattern of these two kinds of moths reversed what does the above observation indicate? Explain giving reasons.

Why is DNA molecule a more stable genetic material than RNA.

Give picture which Representing global biodiversity: proportionate number of species of major taxa of plants, invertebrates and vertebrates.

Do eukaryotic cells have restriction endonucleases? Justify your answer.

List any four parasitic adaptations in a parasite.

OR

List any four features evolved in animals to adapt to their parasitic mode of life.

A, B, D are three independently assorting genes with their recessive alleles a, b, d, respectively. A cross was made between individuals of Aa bb DD genotype with aa bb dd. Find out the type of genotypes of the offspring produced.

Give an account on cloning vectors.

“It is possible that a species may occupy more than one trophic level in the same ecosystem at the same time.” Explain with the help of one example.