Biology 2016-2017 HSC Science (General) 12th Standard Board Exam Question Paper Solution

The genotype of human blood group B is ______.

I^Ai

I^Bi

I^AI^A

ii

Breakdown of detritus into smaller particles is called _____________

Fragmentation

Leaching 

Catabolism

Humification

In Brassica (rapeseed, mustard)........................ varietys is resistant to Aphids.

(a) Pusa A-4
(b) Pusa Gaurav
(c) Pusa Sawni
(d) . Pusa Shubra

The antibiotic chloromycetin is obtained from ______.

Streptomyces erythreus

Penicillium chrysogenum

Streptomyces venezuelae

Streptomyces griseus

The ________enzyme is used to cut DNA at specific point

(a) DNA polymerase
(b) Alkaline phosphatase
(c) restriction endonuclease
(d) DNA ligase

R. Q. for proteins is about .......................

(a) 0.7

(b) 0.8

(c) 0.9

(d) 1.0

Ozone depletion is occurring widely in the stratosphere; it leads to an ozone hole caused mainly due to ______.

ethylene

methane

CFCs

CO₂

Give an example of the source of thermostable enzyme DNA polymerase.

Give an example of the non-edible or poisonous mushroom, studied by you.

Name the secondary metabolites in Catharanthus roseus.

What is ecological succession?

Name the organism and enzyme which brings about the alcoholic fermentation of sucrose.

Enlist any 'two' floral adaptations in salvia.

Explain the carbon cycle with the help of a simplified model.

What is a test cross?

Explain the significance of a test cross.

Explain 'Wobble hypothesis' with the help of a suitable diagram.

What is a 'biopatent'? Explain it with a suitable example.

Name the parts W, X, Y and Z from the following figure:

Explain replication of bacteriophage with the help of a suitable diagram.

What are 'biofertilizers'? Explain them with suitable examples.

Differentiate between anemophily and entomophily.

Sketch and label V. S. of mature anatropous ovule.

What is 'photophosphorylation'?

Describe non-cyclic photophosphorylation with schematic representation. Give its significance.

What is 'RNA'?

Explain different types of non-genetic RNA with diagrams and functions.

Which. of the following has normal vision?

(a) Xc Xc
(b) Xc Y
(c) XC Xc
(d) Xc Yc

In DNA fingerprinting technique, radioactive DNA probe is obtained from______ of female banded krait snake.

(a) X chromosome
(b) Y chromoson1e
(c) X and Y chromosomes
(d) autosome

Abortion in the first trimester of pregnancy may occur due to lack of ___________.

Aldosterone

Testosterone

Oestrogen

Progesterone

____________ contribute about 60% of the total volume of the semen.

Prostate glands

Cowper's glands

Seminal vesicles

Bartholin's glands

Lowering of blood pressure is related with the production of ____________.

ADH

ADH

ANF

ANF

GH

GH

LH

LH

Humtilin is used to treat ____________.

Diabetes mellitus

Diabetes insipidus

I-Iepatitis

Nephritis

The modification of original genetic make-up is focussed by _____________.

PCR

DNA fingerprinting

Electrophoresis

Gene therapy

Which material is used for isolation of DNA in fingerprinting technique?

Give significance of podocyte

Define the following term:

Commensalism

Name the functions - Acrosome of sperm.

Distinguish between X andY chromosomes. (Mention any 'two' points.) 

Give any 'two' examples of endangered species

Sketch and Label the 'Structure of HIV'.

Write a note on erythrocytes.

What are the uses of vaccine?

Describe the process of budding in hydra.

Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form. 

Explain ABO  blood group system in human being with a suitable chart.

Describe diagrammatic representation of age structure showing declining population.

With the help of a neat and labelled diagram, describe reflex arc.

Describe the human male reproductive system.

Define Endocrine gland

Describe the T. S. of thyroid gland

add a note on deficiency of thyroxine.

Define organic evolution.

Give the principles of Darwin's theory of natural selection.

Objection to Darwin's theory of natural selection.