Reproduction in Lower and Higher Animals — BIOLOGY STD 12 Science — Question

What is biofortification? Mention the contribution of Indian Agricultural Research Institute towards it, with the help of any two examples.
OR
Why is biofortification considered the most practical means to improve public health? Explain taking three examples.

Kishor visited his village and saw some trees on the boundary of the agricultural field. He thought that these are for partioning the land and discussed the matter with his grandfather. His grandfather explained him the utility of trees to the farmers and the farmlands.

1. What are the benefits these trees impart to the farmland?
2. What are such trees called?

What is Joint Forest Management?

Mendel crossed plants that breed true for yellow seeds with plants that breed true for green seeds. All seeds in F-generation were yellow. Work out the inheritance involved in this cross by using symbols for each traits and state which trait was dominant?

Emigration, Immigration, More mortality, Unlimited resources, More natality, Continuous reproduction.

Column A	Column B
(1) Decrease in population density	————–
(2) Increase in population density	—————
(3) Exponential growth	————–

For flower colour in pea, the allele for purple flower (P) is dominant to the allele for white flower (p). A purple flowered plant therefore could be of genotype PP or Pp. What genetic cross would you make to determine the genotype of a purple flowered plant? Explain how your cross gives you the correct genotype of the purple flowered plant?

What is the role of ribosomes in protein synthesis?

There are certain complexities in eukaryotic transcription. Bring out the significance of such complexities.

What are the gastrointestinal hormones? Explain the function of each.

Explain the process of parturition.