BIOLOGY Question Paper Maharashtra HSC Class 12 Board Exam March 2019 PDF

Biology
BOARD QUESTION PAPER : MARCH 2019

BIOLOGY
Note:
i. All questions are compulsory.
ii. Draw neat, labelled diagrams wherever necessary.
iii. Question paper consists of 30 questions divided into FOUR sections namely A, B, C and D.
iv. Section A: contains Q. No. 1 to 4 of multiple choice type of questions carrying one mark each and Q.
No. 5 to 8 are very short answer type of questions carrying one mark each.
v. Section B: contains Q. No. 9 to 18 of short answer type questions carrying two marks each. Internal
choice is provided only to one question.
vi. Section C: contains Q. No. 19 to 27 of short answer type of questions carrying three marks each.
Internal choice is provided only to one question.
vii. Section D: contains Q. No. 28 to 30 of long answer type of questions carrying five marks each.
Internal choice is provided to each question.
viii. For each MCQ, correct answer must be written along with its alphabet,
e.g., (a) ……. / (b) ……. / (c) ……. / (d) ……. etc.
ix. In case of MCQs, (i.e. Q. No. 1 to 4) evaluation would be done for the first attempt only.
x. Start each section on a new page.
xi. Figures to the right indicate full marks.
SECTION A [8]
Q.1 As the base sequence present on one strand of DNA decides the base sequence of other strand, this
strand is considered as _______ (1)
(A) Descending strand (B) Leading strand
(C) Lagging strand (D) Complimentary strand
Q.2 _______ shows haplo-diploid type of sex-determination. (1)

(A) Pigeon (B) Honey bee
(C) Parrot (D) Snake
Q.3 Membrane bound receptors and hormones produce second messengers like _______. (1)
(A) Renin (B) IP3
(C) ANF (D) GHRF
Q.4 During double fertilization second male gamete fuses with _______. (1)
(A) antipodal cell (B) egg cell
(C) secondary nucleus (D) synergids
Q.5 What is Sinus arrhythmias? (1)
Q.6 By which process ammonia is converted into urea in liver? (1)
Q.7 Give the role of plasmids in bacterial cell. (1)
Q.8 A person is showing symptoms like increased BMR, heart rate, pulse rate, blood pressure and
deposition of fats in eye sockets. Name the disease he is suffering from. (1)
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Board Question Paper : March 2019
SECTION B [20]
Q.9 Define apiculture. Name the products obtained from it. (2)
Q.10 Define biofertilizers. Give two types of fungal biofertilizers. (2)
Q.11 Give the types of blood proteins and human hormones produced by recombinant DNA-technique. (2)
Q.12 Write any two scientific and commercial values of transgenic animals in favour of human being. (2)
Q.13 Define ‘Respiratory Quotient’ (RQ) and calculate the Respiratory Quotient for Carbohydrate. (2)
Q.14 Light and dark reactions are interdependent  Explain. (2)
Q.15 Classify the chromosomes on the basis of position of centromere. (2)
Q.16 Sketch and label structure of male gametophyte in angiosperm. (2)
Q.17 Match the following and rewrite: (2)
Group ‘A’ Group ‘B’
i. Diethyle Carbamacine a. AIDS
ii. Widal test b. Pneumonia
iii. Albendazole c. Filariasis
iv. HAART d. Typhoid
e. Ascariasis
Q.18 Complete the following chart and rewrite: (2)
Agencies Type of Pollination
i. Water ……….
ii. ………. Entomophily
iii. Bat ……….
iv. ………. Ornithophily
OR
Explain outbreeding devices in angiospermic plants. (2)
SECTION C
[27]
Q.19 What is Biofortification? Explain selective breeding with suitable example. (3)
Q.20 In the light of Griffith’s experiment, explain the action of two strains of Diplococcus pneumoniae
and give his conclusion. (3)
Q.21 Give scientific reasons: (3)
(A) The pyramid of energy is always upright.
(B) In an ecosystem the energy flow is always unidirectional.
(C) Ozone present in the stratosphere is called as “good ozone”.
Q.22 Define ‘reproductive isolation’ and explain two types of reproductive isolation. (3)
Q.23 Name the connecting link between glycolysis and TCA cycle and explain it. (3)
Q.24 Explain internal structure of kidney with the help of suitable diagram. (3)
307
Biology
Q.25 Explain the mechanism of reflex action with the help of a suitable diagram. (3)
Q.26 Define pollution. “Industries are pouring poison in water”– Explain. (3)
Q.27 With the help of a suitable diagram, describe ultra structure of the cell organelle, which is essential
for photosynthesis. (3)
OR
Q.27 During photosynthesis “O2 is evolved from water molecule and not from CO2”. Give the
experimental proof given by Robert Hill.
SECTION D [15]
Q.28 Explain with help of a suitable diagram conducting system of human heart. (5)
OR
Give reasons:
(A) Lymphatic vessels are milky in appearance.
(B) Monocytes are called scavengers.
(C) The wall of left ventricle is thicker than right ventricle.
(D) Valves are present in the veins.
(E) Pulmonary veins carry oxygenated blood.
Q.29 Which phenomenon gives 2:1 ratio instead of 3:1 ratio?

Describe with graphical representation. (5)
OR
A pea plant homozygous for yellow round seed is crossed with its recessive parents. Calculate the
phenotypic and genotypic ratio with the help of checker board.
Q.30 After puberty human female shows cyclic changes in her reproductive system. Explain structural
and hormonal changes in the uterus. (5)
OR
Give reasons:
(A) Scrotal sac serves as thermoregulator.
(B) Corpus luteum gets converted into corpus albicans in absence of fertilization.
(C) Missing of menses is the first indication of pregnancy.
(D) Surgical sterilization is a permanent method of birth control.
(E) Human egg is microlecithal.
308

BIOLOGY Question Paper Maharashtra HSC Class 12 Board Exam March 2019 PDF

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Biology

BOARD QUESTION PAPER : MARCH 2019

Q.2 _______ shows haplo-diploid type of sex-determination. (1)

Q.5 What is Sinus arrhythmias? (1)

Q.6 By which process ammonia is converted into urea in liver? (1)

Q.7 Give the role of plasmids in bacterial cell. (1)

Q.29 Which phenomenon gives 2:1 ratio instead of 3:1 ratio?

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