Botany 2023

(a) What is meant by seed dormancy? Enlist and explain different causes of seed dormancy.

(b) What role do auxins perform in various developmental phenomena in plants?

Write short notes on the following:

(i) Day neutral plants

(ii) Photoperiodic induction

(iii) Long day plants

(iv) Short day plants

What is meant by salinity? Give causes and effects of salinity and suggest some measures for reclamation of saline soil.

(a) Compare the process of mitosis and meiosis in detail.

(b) Explain the significance of the process of meiosis for plants.

(c) Write a note on ribosomes.

(a) Suppose that a normal woman marries a man with hemophilia. What is the probability of the couple having a hemophilic son, and hemophilic daughter?

(b) In cross between a pure bred, red eyed female fruit fly and a white eyed male, which parent of the male offspring will have white eyes?

(a) What are the properties of genetic code?

(b) Write down a note on genomic library.

(a) Briefly give the salient points of Darwin's theory of natural selection.

(b) How can you explain modern synthetic theory of evolution?

Differentiate between the followings:

(i) Lamarckism vs Darwinism

(ii) Darwinism vs Neo-Darwinism

(iii) Natural Selection Theory vs Artificial Selection theory

(iv) Adaptive mutation vs Normal mutation