Organisms and Populations — BIOLOGY STD 12 Science — Question

Name the two types of immunity in a human body. Why are cell-mediated and humoral immunities so called?

What are the allied professions to poultry?

What is resource partitioning? Give an example.

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
Write the conclusion you draw of the inheritance pattern of this disease.

Differentiate between biodegradable and non biodegradable wastes.

How is the milk production regulated by hormones in human female? Explain.

State the function of filiform apparatus found in mature embryo sac of an angiosperm.

Differentiate between rDNA and cDNA.

Name the type of food chains responsible for the flow of larger fraction of energy in an aquatic and a terrestrial ecosystem respectively. Mention one difference between the two food chains.

Identify the statements as correct/ incorrect and give proper justification for your answer.

1. Zygote is the link between two generations.
2. Zygote is a single cell.
3. In organisms with haplontic life cycle, zygote divides by meiosis to form haploid spores.
4. In organisms with haplontic life cycle, zygote divides by mitosis to form haploid spores.