Model Paper 3 — BIOLOGY STD 12 Science — Question

Scutellum is the single cotyledon found in the monocot embryo only. Explain.

Name any two copper releasing IUDs.

Name the important mammary gland secretion that provides resistance to a newborn.

Taking ABO blood group as an example, explain the phenomenon of multiple allele and co-dominance.

Name the layer of cells forming the outerwall of blastocyet.

What is a bioreactor used for? Name a commonly used bioreactor and any two of its components.

Water is very essential for life. Write any three features each for plants and animals, which enable them to survive in water scarce environment.

What is ecological succession? Where and why would the rate of succession be faster, in a newly created pond or a forest destroyed by a forest fire?

With the help of a diagram, explain that the nature of DNA replication is semiconservative.###Explain the experiment of Matthew Meselson and Franklin Stahl's [Diagram is not necessary]

In eukaryotes, explain splicing & tailing (figure is not necessary).