Dibrugarh University Question Paper - Botany – Science - (Nov'2019)





Course: 501

(Cytogenetic, Evolution and Biostatistics)

Full Marks: 48

Pass Marks: 19/14

Time: 2 hours

The figures in the margin indicate full marks for the questions

1. (a) Choose the correct answer:                                             1x3=3

1)         Mitochondria / ribosome / chloroplast is regarded as the factory of protein synthesis.

2)         The crossing-over takes place in leptotene / pachytene / displotene stage.

3)         The genes inherited through cytoplasm are called cytogenes / plasmogenes / genomes.

(b) Fill in the blanks:                                    1x2=2

1)         The theory of natural selection was proposed by Darwin in his book _________.

2)         The arithmetic mean of 8, 7, 9, 6, 5 is _________.

(c) Write short notes on:                          3+2+2+2=9

1)         Linkage.

2)         Nucleotide.

3)         Organic evolution.

4)         Biostatistics.

2. Discuss briefly the following (any four):                            3x4=12

a)         Mitochondria are the powerhouse of a cell.

b)         Modern concept of gene.

c)          Hybridization technique.

d)         Application of tissue culture in crop improvement.

e)         Chloroplast.

f)          Mutation.

3. Who was Mendel? Explain in detail his laws of inheritance.                      2+10=12


What do you mean by protoplast fusion? What are the methods of it? Also mention the application of somatic hybridization in crop improvements.                                       2+5+5=12

4. Write short notes on:                                                5x2=10

a)         Theory of Lamarck.


Miller’s experiment.

b)         Scope of biostatistics.


Mean and median.



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