Biology 2015-2016 HSC Science (General) 12th Standard Board Exam Question Paper Solution

The phenotypic ratio of incomplete dominance is ______.

2 : 1

1 : 2 : 1

1 : 1 : 1

1 : 1 : 2

9 : 3 : 3 : 1

1 : 1

3 : 1

The number of purines in a segment of a DNA molecule is 68. What will be the number of pyrimidines in this segment?

34

43

68

86

Alcoholic fermentation is brought about by ______.

Lactobacillus

Saccharomyces

Trichoderma

Streptomyces

Which of the following is not a photosynthetic pigment?

Carotene

Xanthophyll

Phycobillins

Anthocyanin

Which one of the following is a stop codon?

(a) UAG

(b) UAC

(c) AUG

(d) UCA

Pyruvate undergoes oxidative decarboxylation to produce _____________.

(a) 2-PGA

(b) α-Ketoglutarate

(c) Succinyl-Co-A

(d) Acetyl-Co-A

Which day is observed as ‘World Environment Day’?

21st May

5th June

25th September

13th December

What is a test cross?

What is mycoherbicide?

What is Anticodon?

What is Humification?

How CO₂ makes idlies puffy?

What is ecological succession?

Sketch and label the ‘Ultrastructure of Chloroplast’.

Write a short note on ‘Mutational breeding’.

Enlist the advantages of Biogas.

Explain ‘Carbon cycle’.

Give the floral adaptations for chiropterophily.

Why the ratio in pleiotropy is 2 : 1? Explain it with an example.

Give the schematic representation of the TCA cycle.

Differentiate between cyclic and non-cyclic photophosphorylation.

Give diagrammatic representation to show a perfect pairing and any ‘two’ Wobble pairings.

What is double fertilisation? Describe the process in brief.

Define r-DNA technology.

Give the basic steps in r-DNA technology

Give any ‘three’ examples of the therapeutic products produced by r-DNA technology?

If centromere is situated in the middle of the chromosome, it is called ________.

(a) Metacentric

(b) Acrocentric

(c) Submetacentric

(d) Telocentric

Which one of the following is useful in treatment of burns and wound healing?

Tissue plasminogen activator

Tissue growth factor

DNAse

Bovine growth hormone

Erythroblastosis foetalis is caused when the mother is ____________.

Rh+ve

With antibody ‘A’

Rh-ve

With antibody ‘B’

Deposition of fatty substances in the lining of arteries results in ____________.

Arteriosclerosis

Atherosclerosis

Hyperglycemia

Hypotension

Struggle between cow and cow to get grass is called ______.

Inter-specific struggle

Environmental struggle

Struggle against natural calamities

Intra-specific struggle

In which type of adaptation, forelimbs are modified into wings?

(a) Aquatic adaptations

(b) Volant adaptations

(c) Arboreal adaptations

(d) Cursorial adaptations

Mating of two closely related individuals within the same breed is called ______.

(a) In-breeding

(b) Out-breeding

(c) Out-crossing

(d) Cross-breeding

Visit of a veterinary doctor to dairy farm is mandatory. Give reasons.

Why aquatic animals can afford to be ammonotelic?

Why PUC is mandatory for vehicles?

Define organic evolution.

Give the genotype of Turner’s syndrome.

Write down the full form of R.F.L.P.

Sketch and label the T.S. of vein.

Give any ‘two’ factors responsible for genetic variation.

Give the name and function for ‘A’ and ‘B’ from the diagram given below

Write a note on ‘artificial acquired active immunity’.

Give the economic importance of ‘fisheries’

Explain sex determination in human beings.

Describe steady population with the help of a pyramid.

Illustrate any ‘three’ genes which can be used in gene therapy.

Sketch and label ‘L.S. of human kidney’

With the help of diagrammatic representation, explain the process of gametogenesis

Describe the structure of the cerebrum. Add a note on its function.