Biology: CBSE Sample Question Paper (2019-20) | Sample Papers for Class 12 Medical and Non-Medical PDF Download

 Page 1


1	
	
	
Sample	Question	Paper	
Class	XII	(2019-20)	
Biology	(044)	
	
	
Time	allowed:	3hrs.																																																																																																								Maximum	Marks:	70		
	
General	Instructions:		
1. There	are	a	total	of	27	questions	and	five	sections	in	the	question	paper.	All	questions	are	
compulsory.	
2. Section	A	contains	question	numbers	1	to	5,	multiple	choice	questions	of	one	mark	each.		
Section	B	contains	question	numbers	6	to	12,	short	answer	type	I	questions	of	two	marks	
each.		
Section	C	contains	question	numbers	13	to	21,	short	answer	type	II	questions	of	three	marks	
each.		
Section	D	contains	question	number	22	to	24,	case-based	short	answer	type	questions	of	
three	marks	each	(1+1+1).		
Section	E	contains	question	numbers	25	to	27,	long	answer	type	questions	of	five	marks	each.		
3. There	is	no	overall	choice	in	the	question	paper.	However,	internal	choices	are	provided	in	
two	questions	of	one	mark,	one	question	of	two	marks,	two	questions	of	three	marks	and	all	
three	questions	of	five	marks.	An	examinee	is	to	attempt	any	one	of	the	questions	out	of	the	
two	given	in	the	question	paper	with	the	same	question	number.		
	
	 SECTION	–	A	
	
	
1.	 Androgens	are	synthesized	by:		
		a.)			Sertoli	Cells		
		b.)			Leydig	cells		
		c.)			Seminal	vesicles	
		d.)			Bulbourethral	gland		
OR		
A	procedure	that	finds	use	in	testing	for	genetic	disorders,	but	is	also	misused	
for	foeticide	is:	
		a.)			Lactational	amenorrhea		
		b.)			Amniocentesis	
		c.)			Artificial	insemination	
		d.)			Parturition	
	
1	
2.	 Transplantation	of	tissues/organs	to	save	certain	patients	often	fails	due	to	
rejection	of	such	tissues/organs	in	the	patient’s	body.	Which	type	of	immune	
response	is	responsible	for	such	rejection?	
		a.)			auto-immune	response	
		b.)			humoral	immune	response	
		c.)			physiological	immune	response	
		d.)			cell-mediated	immune	response		
OR	
	
1	
Page 2


1	
	
	
Sample	Question	Paper	
Class	XII	(2019-20)	
Biology	(044)	
	
	
Time	allowed:	3hrs.																																																																																																								Maximum	Marks:	70		
	
General	Instructions:		
1. There	are	a	total	of	27	questions	and	five	sections	in	the	question	paper.	All	questions	are	
compulsory.	
2. Section	A	contains	question	numbers	1	to	5,	multiple	choice	questions	of	one	mark	each.		
Section	B	contains	question	numbers	6	to	12,	short	answer	type	I	questions	of	two	marks	
each.		
Section	C	contains	question	numbers	13	to	21,	short	answer	type	II	questions	of	three	marks	
each.		
Section	D	contains	question	number	22	to	24,	case-based	short	answer	type	questions	of	
three	marks	each	(1+1+1).		
Section	E	contains	question	numbers	25	to	27,	long	answer	type	questions	of	five	marks	each.		
3. There	is	no	overall	choice	in	the	question	paper.	However,	internal	choices	are	provided	in	
two	questions	of	one	mark,	one	question	of	two	marks,	two	questions	of	three	marks	and	all	
three	questions	of	five	marks.	An	examinee	is	to	attempt	any	one	of	the	questions	out	of	the	
two	given	in	the	question	paper	with	the	same	question	number.		
	
	 SECTION	–	A	
	
	
1.	 Androgens	are	synthesized	by:		
		a.)			Sertoli	Cells		
		b.)			Leydig	cells		
		c.)			Seminal	vesicles	
		d.)			Bulbourethral	gland		
OR		
A	procedure	that	finds	use	in	testing	for	genetic	disorders,	but	is	also	misused	
for	foeticide	is:	
		a.)			Lactational	amenorrhea		
		b.)			Amniocentesis	
		c.)			Artificial	insemination	
		d.)			Parturition	
	
1	
2.	 Transplantation	of	tissues/organs	to	save	certain	patients	often	fails	due	to	
rejection	of	such	tissues/organs	in	the	patient’s	body.	Which	type	of	immune	
response	is	responsible	for	such	rejection?	
		a.)			auto-immune	response	
		b.)			humoral	immune	response	
		c.)			physiological	immune	response	
		d.)			cell-mediated	immune	response		
OR	
	
1	
2	
	
Which	of	the	following	are	the	correct	reasons	for	Rheumatoid	arthritis?	
		i.)			Lymphocytes	become	more	active	
		ii.)		Body	attacks	self	cells	
		iii.)	More	antibodies	are	produced	in	the	body	
		iv.)	The	ability	to	differentiate	pathogens	or	foreign	molecules	from	self	cells	
is	lost	
Choose	the	correct	answer	from	the	options	given	below:	
		a.)			i	and	ii		
		b.)			iii	and	iv		
		c.)			i	and	iii	
		d.)			ii	and	iv		
	
3.	 Name	the	enzymes	'P'	and	'Q'	that	carry	out	the	following	processes	
	
	
		a.)			Enzyme	P-Exonuclease	and	Enzyme	Q-Permease	
b.) 	Enzyme	P-Exonuclease	and		Enzyme	Q-	Ligase	
c.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-	Permease		
d.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-Ligase	
	
1	
4.	 A	biotechnologist	wanted	to	create	a	colony	of	E.coli	possessing	the	plasmid	
pBR322,	sensitive	to	Tetracycline.	Which	one	of	the	following	restriction	sites	
would	he	use	to	ligate	a	foreign	DNA?		
		a.)			Sal	I	
b.) 	Pvu	I		
		c.)			EcoRI	
		d.)			Hind	III		
	
1	
5.	 Most	important	cause	of	biodiversity	loss	is:		
		a.)			Over	exploitation	of	economic	species		
		b.)			Habitat	loss	and	fragmentation		
		c.)			Invasive	species	
		d.)			Breakdown	of	plant-pollinator	relationships		
1	
	 	
	
	
Page 3


1	
	
	
Sample	Question	Paper	
Class	XII	(2019-20)	
Biology	(044)	
	
	
Time	allowed:	3hrs.																																																																																																								Maximum	Marks:	70		
	
General	Instructions:		
1. There	are	a	total	of	27	questions	and	five	sections	in	the	question	paper.	All	questions	are	
compulsory.	
2. Section	A	contains	question	numbers	1	to	5,	multiple	choice	questions	of	one	mark	each.		
Section	B	contains	question	numbers	6	to	12,	short	answer	type	I	questions	of	two	marks	
each.		
Section	C	contains	question	numbers	13	to	21,	short	answer	type	II	questions	of	three	marks	
each.		
Section	D	contains	question	number	22	to	24,	case-based	short	answer	type	questions	of	
three	marks	each	(1+1+1).		
Section	E	contains	question	numbers	25	to	27,	long	answer	type	questions	of	five	marks	each.		
3. There	is	no	overall	choice	in	the	question	paper.	However,	internal	choices	are	provided	in	
two	questions	of	one	mark,	one	question	of	two	marks,	two	questions	of	three	marks	and	all	
three	questions	of	five	marks.	An	examinee	is	to	attempt	any	one	of	the	questions	out	of	the	
two	given	in	the	question	paper	with	the	same	question	number.		
	
	 SECTION	–	A	
	
	
1.	 Androgens	are	synthesized	by:		
		a.)			Sertoli	Cells		
		b.)			Leydig	cells		
		c.)			Seminal	vesicles	
		d.)			Bulbourethral	gland		
OR		
A	procedure	that	finds	use	in	testing	for	genetic	disorders,	but	is	also	misused	
for	foeticide	is:	
		a.)			Lactational	amenorrhea		
		b.)			Amniocentesis	
		c.)			Artificial	insemination	
		d.)			Parturition	
	
1	
2.	 Transplantation	of	tissues/organs	to	save	certain	patients	often	fails	due	to	
rejection	of	such	tissues/organs	in	the	patient’s	body.	Which	type	of	immune	
response	is	responsible	for	such	rejection?	
		a.)			auto-immune	response	
		b.)			humoral	immune	response	
		c.)			physiological	immune	response	
		d.)			cell-mediated	immune	response		
OR	
	
1	
2	
	
Which	of	the	following	are	the	correct	reasons	for	Rheumatoid	arthritis?	
		i.)			Lymphocytes	become	more	active	
		ii.)		Body	attacks	self	cells	
		iii.)	More	antibodies	are	produced	in	the	body	
		iv.)	The	ability	to	differentiate	pathogens	or	foreign	molecules	from	self	cells	
is	lost	
Choose	the	correct	answer	from	the	options	given	below:	
		a.)			i	and	ii		
		b.)			iii	and	iv		
		c.)			i	and	iii	
		d.)			ii	and	iv		
	
3.	 Name	the	enzymes	'P'	and	'Q'	that	carry	out	the	following	processes	
	
	
		a.)			Enzyme	P-Exonuclease	and	Enzyme	Q-Permease	
b.) 	Enzyme	P-Exonuclease	and		Enzyme	Q-	Ligase	
c.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-	Permease		
d.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-Ligase	
	
1	
4.	 A	biotechnologist	wanted	to	create	a	colony	of	E.coli	possessing	the	plasmid	
pBR322,	sensitive	to	Tetracycline.	Which	one	of	the	following	restriction	sites	
would	he	use	to	ligate	a	foreign	DNA?		
		a.)			Sal	I	
b.) 	Pvu	I		
		c.)			EcoRI	
		d.)			Hind	III		
	
1	
5.	 Most	important	cause	of	biodiversity	loss	is:		
		a.)			Over	exploitation	of	economic	species		
		b.)			Habitat	loss	and	fragmentation		
		c.)			Invasive	species	
		d.)			Breakdown	of	plant-pollinator	relationships		
1	
	 	
	
	
3	
	
SECTION	B	
	
6.	 How	 does	 an	 encysted	 Amoeba	 reproduce	 on	 return	 of	 favourable	
conditions?	
OR	
What	are	gemmules	and	conidia?	Name	one	organism	each	in	which	these	
are	formed?	
	
2	
7.	 Name	any	two	copper	related	IUD’s.	Explain	how	it	acts	as	a	contraceptive?	 2	
8.	 Why	is	it	not	possible	to	study	the	inheritance	pattern	of	traits	in	human	
beings,	the	same	way	as	it	is	done	in	pea	plant?	Name	the	alternate	method	
employed	for	such	an	analysis	of	human	traits.	
	
2	
9.	 Carefully	examine	structures	A	and	B	of	pentose	sugar	given	below.	Which	
one	is	more	reactive?	Give	reasons.	
	
	
																																												A																																													B	
	
2	
10.	 Name	the	technology	and	the	procedure	involved	which	can	help	a	scientist	
recover	virus	free	sugarcane	plants	from	diseased	canes	for	his	crop	breeding	
experiments.			
	
2	
11.	 Explain	the	events	that	occur	in	the	host	cell	on	introduction	of	nematode-
resistant	gene	into	the	tobacco	plant	by	using	Agrobacterium	vectors.	
	
2	
12.	 Construct	 a	 pyramid	 of	 biomass	 starting	 with	 phytoplankton.	 Label	 three	
trophic	levels.	Is	the	pyramid	upright	or	inverted?	Justify	your	answer.	
	
2	
	 SECTION	C	 	
	13.	 Draw	a	well	labelled	diagram	of	L.S	of	a	pistil	showing	the	passage	of	growing	
of	pollen	tube	up	to	its	destination.	
	
3	
14.	 How	does	gain	or	loss	of	chromosome(s)	takes	place	in	humans?	Describe	one	
example	each	of	chromosomal	disorder	along	with	the	symptoms	involving	an	
autosome	and	a	sex	chromosome.	
3	
Page 4


1	
	
	
Sample	Question	Paper	
Class	XII	(2019-20)	
Biology	(044)	
	
	
Time	allowed:	3hrs.																																																																																																								Maximum	Marks:	70		
	
General	Instructions:		
1. There	are	a	total	of	27	questions	and	five	sections	in	the	question	paper.	All	questions	are	
compulsory.	
2. Section	A	contains	question	numbers	1	to	5,	multiple	choice	questions	of	one	mark	each.		
Section	B	contains	question	numbers	6	to	12,	short	answer	type	I	questions	of	two	marks	
each.		
Section	C	contains	question	numbers	13	to	21,	short	answer	type	II	questions	of	three	marks	
each.		
Section	D	contains	question	number	22	to	24,	case-based	short	answer	type	questions	of	
three	marks	each	(1+1+1).		
Section	E	contains	question	numbers	25	to	27,	long	answer	type	questions	of	five	marks	each.		
3. There	is	no	overall	choice	in	the	question	paper.	However,	internal	choices	are	provided	in	
two	questions	of	one	mark,	one	question	of	two	marks,	two	questions	of	three	marks	and	all	
three	questions	of	five	marks.	An	examinee	is	to	attempt	any	one	of	the	questions	out	of	the	
two	given	in	the	question	paper	with	the	same	question	number.		
	
	 SECTION	–	A	
	
	
1.	 Androgens	are	synthesized	by:		
		a.)			Sertoli	Cells		
		b.)			Leydig	cells		
		c.)			Seminal	vesicles	
		d.)			Bulbourethral	gland		
OR		
A	procedure	that	finds	use	in	testing	for	genetic	disorders,	but	is	also	misused	
for	foeticide	is:	
		a.)			Lactational	amenorrhea		
		b.)			Amniocentesis	
		c.)			Artificial	insemination	
		d.)			Parturition	
	
1	
2.	 Transplantation	of	tissues/organs	to	save	certain	patients	often	fails	due	to	
rejection	of	such	tissues/organs	in	the	patient’s	body.	Which	type	of	immune	
response	is	responsible	for	such	rejection?	
		a.)			auto-immune	response	
		b.)			humoral	immune	response	
		c.)			physiological	immune	response	
		d.)			cell-mediated	immune	response		
OR	
	
1	
2	
	
Which	of	the	following	are	the	correct	reasons	for	Rheumatoid	arthritis?	
		i.)			Lymphocytes	become	more	active	
		ii.)		Body	attacks	self	cells	
		iii.)	More	antibodies	are	produced	in	the	body	
		iv.)	The	ability	to	differentiate	pathogens	or	foreign	molecules	from	self	cells	
is	lost	
Choose	the	correct	answer	from	the	options	given	below:	
		a.)			i	and	ii		
		b.)			iii	and	iv		
		c.)			i	and	iii	
		d.)			ii	and	iv		
	
3.	 Name	the	enzymes	'P'	and	'Q'	that	carry	out	the	following	processes	
	
	
		a.)			Enzyme	P-Exonuclease	and	Enzyme	Q-Permease	
b.) 	Enzyme	P-Exonuclease	and		Enzyme	Q-	Ligase	
c.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-	Permease		
d.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-Ligase	
	
1	
4.	 A	biotechnologist	wanted	to	create	a	colony	of	E.coli	possessing	the	plasmid	
pBR322,	sensitive	to	Tetracycline.	Which	one	of	the	following	restriction	sites	
would	he	use	to	ligate	a	foreign	DNA?		
		a.)			Sal	I	
b.) 	Pvu	I		
		c.)			EcoRI	
		d.)			Hind	III		
	
1	
5.	 Most	important	cause	of	biodiversity	loss	is:		
		a.)			Over	exploitation	of	economic	species		
		b.)			Habitat	loss	and	fragmentation		
		c.)			Invasive	species	
		d.)			Breakdown	of	plant-pollinator	relationships		
1	
	 	
	
	
3	
	
SECTION	B	
	
6.	 How	 does	 an	 encysted	 Amoeba	 reproduce	 on	 return	 of	 favourable	
conditions?	
OR	
What	are	gemmules	and	conidia?	Name	one	organism	each	in	which	these	
are	formed?	
	
2	
7.	 Name	any	two	copper	related	IUD’s.	Explain	how	it	acts	as	a	contraceptive?	 2	
8.	 Why	is	it	not	possible	to	study	the	inheritance	pattern	of	traits	in	human	
beings,	the	same	way	as	it	is	done	in	pea	plant?	Name	the	alternate	method	
employed	for	such	an	analysis	of	human	traits.	
	
2	
9.	 Carefully	examine	structures	A	and	B	of	pentose	sugar	given	below.	Which	
one	is	more	reactive?	Give	reasons.	
	
	
																																												A																																													B	
	
2	
10.	 Name	the	technology	and	the	procedure	involved	which	can	help	a	scientist	
recover	virus	free	sugarcane	plants	from	diseased	canes	for	his	crop	breeding	
experiments.			
	
2	
11.	 Explain	the	events	that	occur	in	the	host	cell	on	introduction	of	nematode-
resistant	gene	into	the	tobacco	plant	by	using	Agrobacterium	vectors.	
	
2	
12.	 Construct	 a	 pyramid	 of	 biomass	 starting	 with	 phytoplankton.	 Label	 three	
trophic	levels.	Is	the	pyramid	upright	or	inverted?	Justify	your	answer.	
	
2	
	 SECTION	C	 	
	13.	 Draw	a	well	labelled	diagram	of	L.S	of	a	pistil	showing	the	passage	of	growing	
of	pollen	tube	up	to	its	destination.	
	
3	
14.	 How	does	gain	or	loss	of	chromosome(s)	takes	place	in	humans?	Describe	one	
example	each	of	chromosomal	disorder	along	with	the	symptoms	involving	an	
autosome	and	a	sex	chromosome.	
3	
4	
	
OR	
A	small	stretch	of	DNA	that	codes	for	a	polypeptide	is	given	below	
3'---	---	---	---	CAT	CAT	AGA	TGA	AAC---	---	---	---	5'	
a.) 	Which	type	of	mutation	could	have	occurred	in	each	type	resulting	in	
the	following	mistakes	during	replication	of	the	above	original	sequence?		
i. 3`…	…	…	…CAT	CAT	AGA	TGA	ATC…	…	…5`	
ii. 3`…	…	…	…CAT	ATA	GAT	GAA	AC…		…	…	5`	
	
		b.)		How	many	amino	acids	will	be	translated	in	each	of	the	above	two	cases?		
	
15.	 “Apomixes	is	a	form	of	asexual	reproduction	that	mimics	sexual	reproduction	
in	plants”.	Explain	with	the	help	of	a	suitable	example.	
	
3	
16.	 	
	
	
	
	
	
	
	
	
			
	
	
		a.)		State	the	hypothesis	which	S.L.	Miller	tried	to	prove	in	the	laboratory	
with	the				help	of	the	set	up	given	above.	
	b.)	Name	the	organic	compound	observed	by	him	in	the	liquid	water	after	
running	the	above	experiment.	
	c.)		A	scientist	simulated	a	similar	set	up	and	added	CH
4
,	NH
3
	and	water	
vapour	 at	 800?. 	Which	 important	 component	 is	 missing	 in	 his	
experiment?	
	
3	
17.	 a.)	
FILL	IN	THE	BLANKS	PROVIDED	
Amino	acid	 Phe	 Val	
DNA	Code	in	Gene	 AAA	 CAC	
Codon	in	mRNA	 (i)	 (ii)	
Anticodon	in	tRNA	 (iii)	 (iv)	
	
		b.)			A	polypeptide	consists	of	14	different	amino	acids.	
	i)			How	many	base	pairs	must	be	there	in	the	processed	mRNA	that	
codes	for	this	polypeptide?	
ii)		How	many	different	types	of	tRNA	are	needed	for	the	synthesis	of	
this				polypeptide?	
	
3	
18.	 How	can	inbreeding	be	both	advantageous	and	disadvantageous	in	cattle	
breeding	programme?	(Mention	any	two	advantages	and	two	disadvantages	)	
3	
Page 5


1	
	
	
Sample	Question	Paper	
Class	XII	(2019-20)	
Biology	(044)	
	
	
Time	allowed:	3hrs.																																																																																																								Maximum	Marks:	70		
	
General	Instructions:		
1. There	are	a	total	of	27	questions	and	five	sections	in	the	question	paper.	All	questions	are	
compulsory.	
2. Section	A	contains	question	numbers	1	to	5,	multiple	choice	questions	of	one	mark	each.		
Section	B	contains	question	numbers	6	to	12,	short	answer	type	I	questions	of	two	marks	
each.		
Section	C	contains	question	numbers	13	to	21,	short	answer	type	II	questions	of	three	marks	
each.		
Section	D	contains	question	number	22	to	24,	case-based	short	answer	type	questions	of	
three	marks	each	(1+1+1).		
Section	E	contains	question	numbers	25	to	27,	long	answer	type	questions	of	five	marks	each.		
3. There	is	no	overall	choice	in	the	question	paper.	However,	internal	choices	are	provided	in	
two	questions	of	one	mark,	one	question	of	two	marks,	two	questions	of	three	marks	and	all	
three	questions	of	five	marks.	An	examinee	is	to	attempt	any	one	of	the	questions	out	of	the	
two	given	in	the	question	paper	with	the	same	question	number.		
	
	 SECTION	–	A	
	
	
1.	 Androgens	are	synthesized	by:		
		a.)			Sertoli	Cells		
		b.)			Leydig	cells		
		c.)			Seminal	vesicles	
		d.)			Bulbourethral	gland		
OR		
A	procedure	that	finds	use	in	testing	for	genetic	disorders,	but	is	also	misused	
for	foeticide	is:	
		a.)			Lactational	amenorrhea		
		b.)			Amniocentesis	
		c.)			Artificial	insemination	
		d.)			Parturition	
	
1	
2.	 Transplantation	of	tissues/organs	to	save	certain	patients	often	fails	due	to	
rejection	of	such	tissues/organs	in	the	patient’s	body.	Which	type	of	immune	
response	is	responsible	for	such	rejection?	
		a.)			auto-immune	response	
		b.)			humoral	immune	response	
		c.)			physiological	immune	response	
		d.)			cell-mediated	immune	response		
OR	
	
1	
2	
	
Which	of	the	following	are	the	correct	reasons	for	Rheumatoid	arthritis?	
		i.)			Lymphocytes	become	more	active	
		ii.)		Body	attacks	self	cells	
		iii.)	More	antibodies	are	produced	in	the	body	
		iv.)	The	ability	to	differentiate	pathogens	or	foreign	molecules	from	self	cells	
is	lost	
Choose	the	correct	answer	from	the	options	given	below:	
		a.)			i	and	ii		
		b.)			iii	and	iv		
		c.)			i	and	iii	
		d.)			ii	and	iv		
	
3.	 Name	the	enzymes	'P'	and	'Q'	that	carry	out	the	following	processes	
	
	
		a.)			Enzyme	P-Exonuclease	and	Enzyme	Q-Permease	
b.) 	Enzyme	P-Exonuclease	and		Enzyme	Q-	Ligase	
c.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-	Permease		
d.) 	Enzyme	P-Endonuclease	and	Enzyme	Q-Ligase	
	
1	
4.	 A	biotechnologist	wanted	to	create	a	colony	of	E.coli	possessing	the	plasmid	
pBR322,	sensitive	to	Tetracycline.	Which	one	of	the	following	restriction	sites	
would	he	use	to	ligate	a	foreign	DNA?		
		a.)			Sal	I	
b.) 	Pvu	I		
		c.)			EcoRI	
		d.)			Hind	III		
	
1	
5.	 Most	important	cause	of	biodiversity	loss	is:		
		a.)			Over	exploitation	of	economic	species		
		b.)			Habitat	loss	and	fragmentation		
		c.)			Invasive	species	
		d.)			Breakdown	of	plant-pollinator	relationships		
1	
	 	
	
	
3	
	
SECTION	B	
	
6.	 How	 does	 an	 encysted	 Amoeba	 reproduce	 on	 return	 of	 favourable	
conditions?	
OR	
What	are	gemmules	and	conidia?	Name	one	organism	each	in	which	these	
are	formed?	
	
2	
7.	 Name	any	two	copper	related	IUD’s.	Explain	how	it	acts	as	a	contraceptive?	 2	
8.	 Why	is	it	not	possible	to	study	the	inheritance	pattern	of	traits	in	human	
beings,	the	same	way	as	it	is	done	in	pea	plant?	Name	the	alternate	method	
employed	for	such	an	analysis	of	human	traits.	
	
2	
9.	 Carefully	examine	structures	A	and	B	of	pentose	sugar	given	below.	Which	
one	is	more	reactive?	Give	reasons.	
	
	
																																												A																																													B	
	
2	
10.	 Name	the	technology	and	the	procedure	involved	which	can	help	a	scientist	
recover	virus	free	sugarcane	plants	from	diseased	canes	for	his	crop	breeding	
experiments.			
	
2	
11.	 Explain	the	events	that	occur	in	the	host	cell	on	introduction	of	nematode-
resistant	gene	into	the	tobacco	plant	by	using	Agrobacterium	vectors.	
	
2	
12.	 Construct	 a	 pyramid	 of	 biomass	 starting	 with	 phytoplankton.	 Label	 three	
trophic	levels.	Is	the	pyramid	upright	or	inverted?	Justify	your	answer.	
	
2	
	 SECTION	C	 	
	13.	 Draw	a	well	labelled	diagram	of	L.S	of	a	pistil	showing	the	passage	of	growing	
of	pollen	tube	up	to	its	destination.	
	
3	
14.	 How	does	gain	or	loss	of	chromosome(s)	takes	place	in	humans?	Describe	one	
example	each	of	chromosomal	disorder	along	with	the	symptoms	involving	an	
autosome	and	a	sex	chromosome.	
3	
4	
	
OR	
A	small	stretch	of	DNA	that	codes	for	a	polypeptide	is	given	below	
3'---	---	---	---	CAT	CAT	AGA	TGA	AAC---	---	---	---	5'	
a.) 	Which	type	of	mutation	could	have	occurred	in	each	type	resulting	in	
the	following	mistakes	during	replication	of	the	above	original	sequence?		
i. 3`…	…	…	…CAT	CAT	AGA	TGA	ATC…	…	…5`	
ii. 3`…	…	…	…CAT	ATA	GAT	GAA	AC…		…	…	5`	
	
		b.)		How	many	amino	acids	will	be	translated	in	each	of	the	above	two	cases?		
	
15.	 “Apomixes	is	a	form	of	asexual	reproduction	that	mimics	sexual	reproduction	
in	plants”.	Explain	with	the	help	of	a	suitable	example.	
	
3	
16.	 	
	
	
	
	
	
	
	
	
			
	
	
		a.)		State	the	hypothesis	which	S.L.	Miller	tried	to	prove	in	the	laboratory	
with	the				help	of	the	set	up	given	above.	
	b.)	Name	the	organic	compound	observed	by	him	in	the	liquid	water	after	
running	the	above	experiment.	
	c.)		A	scientist	simulated	a	similar	set	up	and	added	CH
4
,	NH
3
	and	water	
vapour	 at	 800?. 	Which	 important	 component	 is	 missing	 in	 his	
experiment?	
	
3	
17.	 a.)	
FILL	IN	THE	BLANKS	PROVIDED	
Amino	acid	 Phe	 Val	
DNA	Code	in	Gene	 AAA	 CAC	
Codon	in	mRNA	 (i)	 (ii)	
Anticodon	in	tRNA	 (iii)	 (iv)	
	
		b.)			A	polypeptide	consists	of	14	different	amino	acids.	
	i)			How	many	base	pairs	must	be	there	in	the	processed	mRNA	that	
codes	for	this	polypeptide?	
ii)		How	many	different	types	of	tRNA	are	needed	for	the	synthesis	of	
this				polypeptide?	
	
3	
18.	 How	can	inbreeding	be	both	advantageous	and	disadvantageous	in	cattle	
breeding	programme?	(Mention	any	two	advantages	and	two	disadvantages	)	
3	
5	
	
	
19.	 “Specific	Bt	Toxin	gene	is	incorporated	into	cotton	plant	so	as	to	control	
infestation	of	Bollworm”.	Mention	the	organism	from	which	the	gene	was	
isolated	and	explain	its	mode	of	action.	
	
3	
20.	 State	any	two	criteria	for	determining	biodiversity	hotspots.	Name	any	two	
hotspots	designated	in	India.	
OR	
Differentiate	 between	 in-situ	 and	 ex-situ	 approaches	 for	 conserving	
biodiversity.	Give	an	example	for	each.	
	
3	
21.	 When	the	gene	product	is	required	in	large	amounts,	so	transformed	bacteria	
with	 the	 plasmid	 inside	 the	 bacteria	 are	 cultured	 on	 a	 large	 scale	 in	 an	
industrial	 fermenter	 which	 then	 synthesizes	 its	 protein.	 This	 product	 is	
extracted	from	the	fermenter	for	commercial	use.	
a.) Why	is	the	used	medium	drained	out	from	one	side	while	fresh	medium	
is	added	from	the	other?	
	
	b.)	List	any	four	optimum	conditions	for	achieving	the	desired	product	in	a	
bioreactor.	
3	
SECTION	D	
	
22.	
	
With	reference	to	the	above	schematic	diagram	of	Spermatogenesis	(a)	and	
Oogenesis(b),	answer	the	following	questions		
a.)	 	 About	 300	 million	 spermatozoa	 may	 be	 present	 in	 a	 human	 male	
ejaculation	at			one	time.	Calculate	how	many	spermatocytes	will	be	
involved	to	produce	this	number	of	spermatozoa.	
b.)		How	many	spermatids	will	be	formed?	
c.)		How	many	chromatids	are	found	during	Oogenesis	in	Primary	oocyte	
and	First	polar	body	in	a	human	female?	
3	
(1+1+1)	
23.	 Large	quantities	of	sewage	is	generated	everyday	in	cities	and	towns,	which	
is	treated	in	Sewage	Treatment	Plants	(STPs)	to	make	it	less	polluting.	
Given	below	is	the	flow	diagram	of	one	of	the	stages	of	STP.	
Observe	the	given	flow	diagram	and	answer	the	questions	accordingly.	
3	
(1+1+1)