Biology Set 1 2017-2018 HSC Science (General) 12th Board Exam Question Paper Solution

Select and write the most appropriate answer from the given alternatives for the following subquestion: 

In an octamer of the nucleosome, core DNA consist of ______ base pairs

46

146

246

346

Select and write the most appropriate answer from the given alternatives for the following subquestion: 

A versatile anther is an adaptation for _______ type of pollination. 

anemophilous

entomophilous 

hydrophilous

ornithophilous

Select and write the most appropriate answer from the given alternatives for the following subquestion: 

 _______ is an example of GM crop developed for its nutritional value by using soil bacterium Erwinia. 

IR8 

Taichung Native - I

Vijaya 

Golden rice 

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

The energy enters the ecosystem through ______. 

consumers

decomposers

omnivores

producers

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

Identify free-living bacterial bio-fertilizer. 

Rhizobium

Azotobacter

Nostoc

Bacillus thuringiensis

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

_______ is a soil bacterium which causes crown gall tumours in dicotyledonous plants. 

Agrobacterium tumefaciens

Bacillus thuringiensis

Haemophilus influenzae

Escherichia coli

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

Which of the following harmful radiation is absorbed by ozone layer of the stratosphere? 

X-ray 

Visible light

Ultraviolet rays

Gamma rays 

Answer the following question in ‘One’ sentence only:

Define ‘mutation breeding’.

Answer the following question in ‘One’ sentence only:

Enlist the histones which form an octamer of nucleosome.

Answer each question in ‘One’ sentence only:

Name ‘any one’ therapeutic product of blood proteins made by using r-DNA technology.

Answer each question in ‘One’ sentence only:

Name the strain of yeast used in industrial production of wine.

Answer each question in ‘One’ sentence only: 

Identify which one of the following is a test cross. 

 Tt × Tt

TT × tt

Tt × tt 

Answer each question in ‘One’ sentence only:

Define stock and scion.

Sketch and label ‘structure of a pea flower’.

Attempt any TWO of the following: 

‘The gene for sickle cell anaemia in homozygous condition is lethal and produces sickle cell trait in heterozygous carrier’. Explain. 

Attempt any TWO of the following:

Enlist the applications of tissue culture.

Attempt any TWO of the following: 

Describe ‘any two’ factors affecting the rate of photosynthesis. 

Attempt any TWO of the following:

Define the terms ‘codon’ and ‘anticodon’. 

Attempt any TWO of the following: 

Explain in brief biogas production process with the help of a labelled figure. 

Attempt any TWO of the following: 

Define ‘deforestation’. Comment on its effects

Attempt any TWO of the following: 

With the help of a suitable example illustrate ‘Palindrome’.