MH 12th Question Paper March 2026 Biology

FOR MAHARASHTRA BOARD (MSBSHSE) CLASS 12 EXAM PREPARATION

Maharashtra Board
(MSBSHSE) Class 12
2026
March Session
Question Paper ·
Biology
EXAM YEAR

Maharashtra Board (MSBSHSE) Class 12 2026
TYPE SUBJECT

March Session Question Paper Biology

Notes · Sample Papers · Previous Year Papers · Mock Tests

m
m .co

m .co s e m
se g l a
SEAT NUMBER
a
DAY — 12 SEAT NUMBER

2026 II 25 1100 (E)
J-189 m
m .co
.co s e m
s em BIOLOGY (56) l a
g la ag
a Time : 3 Hrs. ( 7 Pages ) Max. Marks : 70

General Instructions :
The question paper is divided into four sections.
(1) Section A : Q. No. 1 contains Ten multiple choice

m
type of questions carrying one mark

.co
each. Evaluation will be done for the first

s em
attempt only.

g la 2 Contains Eight very short
Q. No.
a type of questions carrying one
answer
mark each.
(2) Section B : Q. No. 3 to 14 are short answer type of
questions carrying two marks each.
(Attempt any Eight)
(3) Section C : Q. No. 15 to 26 are short answer type of
m
m questions carrying three marks each.
.co
m .co (Attempt any Eight)
s em
s e g la type of
(4) Section D : Q. No. 27 to 31 are long answer
g la questions carrying four amarks each.
a (Attempt any Three)
(5) Begin the answer of each section on a new page.

0 1 8 9 Page 1 P.T.O
m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 1 of 8

SECTION – A

Q. 1. Select and write the correct answer for the following [10]
multiple choice type of questions :

(i) A cell divides mitotically into two. Daughter cells divide
and redivide repeatedly. Such growth is called _____.
(a) arithmetic growth
(b) geometric growth
(c) growth ratio
(d) qualitative growth

(ii) The transgenic plant Tomato contains transgene _____
for the production of flavonoids.
(a) Phytoene synthase (b) Ferritin
(c) Chalone isomerase (d) Phytase

(iii) The cranial capacity of Neanderthal-man was _____
C.C.
(a) 650 (b) 900
(c) 1400 (d) 1450

(iv) Identify the organism which meet their energy and
nutrient requirements by degrading the detritus:
(a) Omnivores (b) Carnivores
(c) Autotrophs (d) Saprotrophs

(v) Identify the algae among the following:
(a) Spirulina spp. (b) Aspergillus niger
(c) Candida utilis (d) Trichoderma viridi

0 1 8 9 Page 2

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 2 of 8

m
m .co

m .co s e m
se g l a
SEAT NUMBER
a
(vi) In plants, soluble food is always translocated in the
form of _____.
(a) glucose (b) starch
(c) sucrose (d) fructose
m
m .co
.co m
(vii) Identify invasive plant species from the following :
s e
s em(a) Gloriosa (b) Michelia
l a
g la (c) Sansvieria (d) Parthenium ag
a (viii) The mature plasma cell produces antibodies at the rate
of _____ molecules per second.
(a) 2000 (b) 1000
(c) 900 (d) 300

(ix) Which is the largest WBC among the following?
m
(a) Eosinophil c. o(b) Monocyte
(c) Basophil
s em (d) Lymphocyte
(x) gla when environmental pressures
The number ofadeaths
come into play is known as _____.
(a) absolute mortality
(b) absolute natality
(c) realized mortality
(d) realized natality
m
om2.
c. Q. m.co
s e
em
Answer the following questions : [8]
s g l a
l a (i) Give the function of Leydig’s cells. a
ag (ii) Define endangered species.

(iii) Name the gene which is inherited directly from father
to son.

0 1 8 9 Page 3 P.T.O
m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 3 of 8

(iv) The producers receive 5000 Joules of light energy, then
how much energy will be transferred to the carnivores
(secondary consumers)?

(v) Define the term chlorosis.

(vi) Give the name of key factor in DNA profiling.

(vii) Define combined water.

(viii) Give the role of tapetum.

SECTION – B
Attempt any EIGHT of the following questions : [16]

Q. 3. Give the features of respiratory surface for gaseous exchange.

Q. 4. Differentiate between complete sex-linkage and incomplete sex-
linkage with reference to location of the gene and inheritance.

Q. 5. Explain the properties of nerve fibre with reference to :
(a) Irritability
(b) Conductivity

Q. 6. Draw a neat diagram of a nucleosome and label the following:
(i) H1 histone
(ii) DNA
(iii) Octamer

Q. 7. Give any four advantages of micropropagation.

Q. 8. Name the organisms and their role in conversion of rock
into soil.

Q. 9. Explain various harmful effects of noise pollution on
human being.

0 1 8 9 Page 4

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 4 of 8

m
m .co

m .co s e m
se g l a
SEAT NUMBER
a
Q. 10. Explain skeletal features of Homo erectus.

Q. 11. Enlist the main objectives for improved animal breeding
programmes using gene transfer technology.

m
.co
Q. 12. Mention any four factors affecting water absorption.
m
Q. 13. .co
Write briefly on Alzheimer’s disease.
m s e m
s e l a
Q. 14.
l a
Calculate the amount of ATP required by nitrogen fixer for
ag
ag the formation of 1000 molecules of ammonia. Name the
specialised cell of cyanobacteria where nitrogen is fixed.

SECTION – C

Attempt any EIGHT of the following questions : [24]
m
Q. 15.
.co
Match the respiratory surface to the organism in which it is
found :
s em
g la Respiratory surface / organs
Organisms
a
(1) Limulus (a) Lungs
(2) Protists (b) Internal gills
(3) Tadpoles of frog (c) Book lungs
(4) Fishes (d) External gills
(5) Reptiles (e) Plasma membrane
m
.co
(6) Spiders (f) Book gills
m
.co em
(g) Cloaca

e m Q. 16. s
Explain criss-cross inheritance with reference tolableeder’s
las ag
ag disease by suitable charts.

Q. 17. (a) Distinguish between hibernation and aestivation.
(b) Give two behavioural adaptations of desert animals.

0 1 8 9 Page 5 P.T.O
m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 5 of 8

Q. 18. Define :
(a) Siphonogamy
(b) Parthenocarpy
(c) Polyembryony

Q. 19. What is transpiration? Explain stomatal opening and closing
mechanism with reference to starch-sugar interconversion
theory.

Q. 20. Enlist any six characteristics of genetic code.

Q. 21. (a) Mention the name of germ layer from which adrenal
cortex and pancreas are developed.
(b) Explain the role of alpha (α) and delta (δ) cells of islets of
Langerhans.

Q. 22. Define addiction. Give the physiological effects of :
(a) Cocaine
(b) Cannabinoids

Q. 23. What is infertility? Describe in brief ZIFT and GIFT.

Q. 24. Draw Urey and Miller’s experimental setup and label it.

Q. 25. (a) What is grand period of growth?
(b) Give two examples each of :
(1) Growth promoters
(2) Growth inhibitors

Q. 26. (a) What is biofertilizer?
(b) Draw and label the T.S. of root nodules.

0 1 8 9 Page 6

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 6 of 8

m
m .co

m .co s e m
se g l a
SEAT NUMBER
a
SECTION – D

Attempt any THREE of the following questions : [12]

m
.co
Q. 27. With the help of labelled diagram describe the structure of
m
.co
human sperm.
s e m
s em l a
ldoa P-wave and QRS complex represent? ag
Q. 28. What is cardiac cycle? Draw a normal ECG and label it. What

ag
Q. 29. Write the name of disorders caused due to hypo and hyper
secretion of adrenal corticoids. Mention any 3 symptoms of each
of these disorders.

Q. 30. Explain nuclear and helobial type of endosperm with suitable
m
.co
examples.

s em
lagene therapy? Why is it not
Q. 31. Describe in brief :

ag
(a) What is germ line
encouraged?
(b) Explain somatic cell gene therapy. Mention any two
acquired disorders for which it is used.
uuu

m
m .co
m .co s e m
s e g l a
g la a
a

0 1 8 9 Page 7 P.T.O
m .
.co s e m
s em l a
g la ag
a For more Question Papers, Sample Papers, Notes & Syllabus visit Page 7 of 8

0 1 8 9 Page 8

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 8 of 8