In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
Assertion (A) : In bee society, all the members are diploid except drones.
Reason (R) : Drones are produced by parthenogenesis
Codes:
A. If both A and R are true and R is correct explanation for A
B. If both A and R are true but R is not the correct explanation for A
C. If A is true but R is false
D. If both A and R are false.

(a)

If both A and R are true and R is correct explanation for A

(b)

If both A and R are true but R is not the correct explanation for A

(c)

If A is true but R is false

(d)

If both A and R are false

In _____ types of natural parthenogenesis only females are produced.

(a)

Thelytoky

(b)

Arrhenotoky

(c)

Amphitoky

(d)

Arrhenotoky

Assertion (A): Syngamy refers to the fusion of two haploid gametes.
Reason (R): Syngamy leads to zygote formation.
Codes:
A. A and R are correct.
B. A and R are incorrect.
C. R is not the right explanation for A
D. A is correct but R is incorrect

(a)

A and R are correct.

(b)

A and R are incorrect.

(c)

R is not the right explanation for A

(d)

A is correct but R is incorrect

Assertion(A): In human male, testes are extra abdominal and lie in scrotal sacs.
Reason(R): Scrotum acts as thermoregulator and keeps temperature lower by 2^oC for normal sperm production.
Codes:
(a) A and R are true, R is the correct explanation of A
(b) A and R are true, R is not the correct explanation of A
(c)  A is true, R is false
(d) Both A and R are false

(a)

A and R are true, R is the correct explanation of A

(b)

A and R are true, R is not the correct explanation of A

(c)

A is true, R is false

(d)

Both A and R are false

Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

(a)

I^A I^B and I^oI^o

(b)

I^A I^o and I^BI^o

(c)

I^B I^B and I^A I^A

(d)

I^A I^A and I^oI^o

Pataus syndrome is also referred to as ______.

(a)

13-Trisomy

(b)

18-Trisormy

(c)

21-Trisormy

(d)

None of these

An operon is a: ______.

(a)

Protein that suppresses gene expression

(b)

Protein that accelerates gene expression

(c)

Cluster of structural genes with related function

(d)

Gene that switched other genes on or off

Exo-erythrocytic schizogony of Plasmodium takes place in _______

(a)

RBC

(b)

Leucocytes

(c)

Stomach

(d)

Liver

The gases produced in anaerobic sludge digesters are

(a)

Methane, oxygen and hydrogen sulphide

(b)

Hydrogen sulphide, methane and sulphur dioxide

(c)

Hydrogen sulphide, nitrogen and methane

(d)

Methane, hydrogen sulphide and CO₂.

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.

(a)

A	B	C
Conformer	Regulator	Partial Regulator

(b)

A	B	C
Regulator	Partial Regulator	Conformer

(c)

A	B	C
Partial Regulator	Regulator	Conformer

(d)

A	B	C
Regulator	Conformer	Partial Regulator

Which among the following is the most abundant Green-House-Gas (GHG) in the earth’s atmosphere?

(a)

Carbon dioxide

(b)

Water Vapour

(c)

Sulphur Dioxide

(d)

Tropospheric Ozone

Which one of the following is an example of polygenic inheritance?

(a)

Flower colour in Mirabilis Jalapa

(b)

Production of male honey bee

(c)

Pod shape in garden pea

(d)

Skin Colour in humans

The process of recombinant DNA technology has the following steps
I. amplication of the gene
II. Insertion of recombinant DNA into the host cells
III. Cutting of DNA at specific location using restriction enzyme .
IV. Isolation of genetic material (DNA) Pick out the correct sequence of step for recombinant DNA technology.

(a)

II, III, IV, I

(b)

IV, II, III, I

(c)

I, II, III, IV

(d)

IV, III, I, II

Which of the following statement is correct

(a)

Agar is not extracted from marine algae such as seaweeds

(b)

Callus undergoes differentiation and produces somatic embryoids.

(c)

Surface sterilization of explants is done by using mercuric bromide

(d)

P^H of the culture medium is 5.0 to 6.0

Which of the following would most likely help to slow down the greenhouse effect.

(a)

Converting tropical forests into grazing land for cattle.

(b)

Ensuring that all excess paper packaging is buried to ashes.

(c)

Redesigning landfill dumps to allow methane to be collected.

(d)

Promoting the use of private rather than public transport.

What happens to the following floral parts, after the fertilization process?
(a) Ovary
(b) Secondary nucleus
(c) Outer integument of ovule
(d) Funicle

Name any four greenhouse gases.

What is Dobson unit?

Where did Montreal Protocol was held? State its objectives.

Mutagens are the substances that induces mutation. Name any two physical and chemical mutagens.

Name the insect resistant varieties developed in the following crops.
(a) Okra (b) Rapeseed mustard.

Complete the table.

	Natural Parthenogenesis	Sex of developing organism
i.	Arrhenotoky	A
ii.	Thelytoky	B
iii.	Amphitoky	C

Brief about female heterogamety.

What is vaccine? What are its types?

Give the diagnostic characters features of a Biome

“Endothecium is associated with dehiscence of anther” Justify the statement

What is vivipary? Name a plant group which exhibits vivipary.

Differentiate between the following:
(a) Binary fission in amoeba and multiple fission in Plasmodium
(b) Budding in yeast and budding in Hydra
(c) Regeneration in lizard and Planaria

What is the difference between syngamy and fertilization?

Amniocentesis, the foetal sex determination test, is banned in our country, Is it necessary? Comment.

(i) Write the scientific name of the filarial worm that causes filariasis.
(ii) Write the symptoms of filariasis.
(iii) How is this disease transmitted?

Give a concise account on steps involved in fertilization of an angiosperm plant.