Reproduction in organisms — BIOLOGY STD 12 Science — Question

Suryakant had banana plantation in his field. Quality of the fruit was excellent but the yield suffered due to infection of the plants by a virus. Suggest a fast and efficient method to get healthy and a large number of plants in the next generation without compromising on the existing quality. Justify the selection of your method.

Explain the contribution of Thermus aquaticus in the amplification of a gene of interest.

While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.

Disorders
Dwarfism, Myxoedema, Addison’s disease, Cushing’s disease, Gigantism, Goitre

Column A	Column B
(1) Pituitary	————
(2) Thyroid	————
(3) Adrenal Cortex	————

Why is mother's milk considered the most appropriate food for a new born infant?

Why are there regular reminders to reduce the use of CFCs in the production of industrial and household appliances? Explain.

Expand the following and mention one application of each:

1. PCR.
2. ELISA.

Select the analogous structures from the combinations given below:

1. Forelimbs of whales and bats
2. Eyes of octopus and mammals
3. Tuber of sweet potato and potato
4. Thorns of Bougainvillea and tendrils of Cucurbita

2. ​​​​​​​State the kind of evolution they represent.

Sketch and label 'tubular tower fermenter'.