Plant Growth and Mineral Nutrition — BIOLOGY STD 12 Science — Question

Why is breast-feeding recommended during the initial period of an infant’s growth? Give reasons.

Write an account of the chromosomal theory of inheritance.

Plants like potato and sugarcane do not require seeds for producing new plants. How do they produce new plants? Give two other examples, where new plants are produced in the same way.

What is ribozyme?

Differentiate between monoecious and dioecious plants. Give one example of each.

Apart from plants and animals, microbes form a permanent biotic component in an ecosystem. While plants have been referred to as autotrophs and animals as heterotrophs, what are microbes referred to as? How do these microbes fulfil their energy requirements?

What is Biopiracy? Explain it with respect to Turmeric.

Explain the dual function of AUG codon. Give the sequence of bases it is transcribed from and its anticodon.

What is Ramsar Convention? How was it called previously?

1. Highlight the role of thymus as a lymphoid organ.
2. Name the cells that are released from the above mentioned gland. Mention how they help in immunity.