Biology Entrance Exam

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CBSE Class 12 Biology Previous Questions- Short Answer Type

1. Name an organism where cell division is itself a mode of reproduction? 
Ans: Unicellular

2. Why is tubecotomy considered a contraceptive method?
Ans: It is a surgical method of contraception

3. Write the percentage of F2 homozygous and heterozygous populations in a typical monohybrid cross?
Ans: Fifty percentage each

4. When does a species become founders to cause founder effect?
Ans: original drifted population becomes founders

5. Name two green house gases produced by anaerobic microbes.
Ans: Carbon dioxide and Methane

6. What is the host called that produces a foreign gene product? What is this product called?
Ans: Cloning vector, recombinant (protein)

7. Why do predators avoid eating Monarch Butterfly? How does the butterfly develop this protecting feature?
Monarch Butterfly
Ans: Monarch butterfly is distasteful. It develops a chemical during its caterpillar state by feeding on a poisonous weed.

8. Why is the use of unleaded petrol recommended for motor vehicles equipped with catalytic converters?
Ans: Lead in petrol inactivates catalysts thus causing emission of poisonous gases. 
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CBSE Class 12 Biology Short Answer Type Sample Questions and Answers

1. The turkey usually produces females for several generations. How it this possible?
Ans: It is due to parthenogenesis.

2. The meiocyte of an onion plant contains 32 chromosomes. Workout the number of chromosomes found in its endosperm.
Ans:
     2n=32(Meiocyte will be diploid)
            n=16 (gametes)
        3n=3x16=48( Endosperm is triploid)

3. The gene I that controls the ABO blood grouping in human beings has three alleles IA, IB and i.

a) How many different genotypes are likely to be present in human population?
b) Also, how many phenotypes are possibly present?
Ans:
     a)  6 Genotypes - IAIA, IAi,( A blood group); IBIB, IBi (B blood GROUP), IAIB (AB blood group), ii (O blood group)
      b) 4 Phenotypes - A, B, AB, O blood groups

4. Pink out the ancestral line of Cycads from the list given below:-
Ferns, herbaceous lycopods, seed ferns and horse tails.
Ans: seed ferns

5. Name the source of smack. Mention one way in which affects the human body.
Ans: Obtained from Papaver somniferum(Poppy plant)
It acts as depressant

6. In plants, how is alien DNA introduced into the host cell?
Ans: To introduce alien DNA in plants, plant cells are bombarded with high velocity micro particles of gold or tungungsten coated with DNA in a method known as biolistics or gene gun (gene transfer methods).

7. Mr. Galgotia eats curd/ yogurt. IN this case, which trophic level will be occupy?
Ans: Third trophic level

8. In the absence of the predators, which curve (a) or (b) would appropriately depict the prey populations?



Ans: Curve a
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BCECE Previous Year Biology Questions and Answers

1. The site of glycolysis is
a) ribosomes
b) nucleus
c) mitochondria
d) cytoplasm

2. In respiration, the released energy forms
a) AMP
b) ADP
c) ATP
d)glucose

3. The number of bases found in RNA are
a) 4
b) 3
c) 2
d) 1

4. The pseudouridine loop is present in
a) DNA
b) mRNA
c) tRNA
d) rRNA


5. This is a structural polysaccharide
a) Starch
b) chitin
c) Amylase
d) Glycogen

6. 70S ribosomes have two units. These are

a) 50S +30S
b) 40S+30S
c) 50S+20S
d) 40s+60s

7. The outer face of the outer membrane of Gram negative bacteria contains
a) teichoic acid
b) peptidoglycans
c) mycoic acid
d) lipopolysaccharides

8. These impart rigidity of plasma membrane
a)phospholipids
b) proteins
c) sterols
d) carbohydrates

9. Which one of the following has least similar characters?
a) family
b) class
c) genus
d) species

10. Blue green algae belong to this kingdom
a) bacteria
b) euglena
c) mycoplasma
d) monera

Answers
1. d) cytoplasm
2. c) ATP
3. a) 4
4. c) tRNA
5. b) chitin
6. a) 50S +30S
7. d) lipopolysaccharides
8. c) sterols
9. d) species
10. d) monera
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MCQ on Plant Kingdom - Diversity in Living World

1. The sporophytic generation is represented by zygote only, in
a) Funaria
b) Selaginella
c) Pinus
d) Chlamydomonas

2. Pinus is a gymnosperm as it has
a) vascular tissue
b) naked ovules
c) vessels
d) All of these

3. There is no alternation of generation in E.coli of absence of
a) nucleus
b) chromosome
c) syngamy
d) reduction division

4. Apophysis is a part of
a) spore of the moss
b) lower part of the moss
c) lower part of the moss capsule
d) anther of the moss

5. Shape of microspores in Selaginella is
a) oval
b) boat shaped
c) tertrahedral
d)none of these

6. A clear alternation of generation is seen in
a) Bryophytes
b) Pteridophytes
c) Gymnosperms
d) Fungi

7. In Funaria the spores are dispersed by the rupture of
a) Operculum
b) Annulus
c) Peristome
d) Trabeculae

8. Asexual reproduction in Spirogyra
a) has not been recorded
b) takes place by zoospore formation
c) takes place by aplanospore formation
d) takes  place by hypnospore formation

9. The commonest method of reproduction in case of blue green algae, is by means of
a) gametes
b) separation
c) heterocycts
d) akinetes

10. Under exceptional circumstances the cell forming aplanospores forms mucilage mass enclosing and protecting numerous small uninucleated bodies. The stage is known a

a) Flagellate stage
b) Resting stage
c) Palmella stage
d) Gongrosira stage

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Answers
1. d) Chlamydomonas
2. b) naked ovules
3. d) reduction division
4. c) lower part of the moss capsule
5. c) tertrahedral
6. b) Pteridophytes
7. b) Annulus
8. c) takes place by aplanospore formation
9. d)akinetes
10.c) Palmella stage
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AIPMT Biology Previous Questions and Answers with explanations

11. Biological organisation starts with (AIPMT, 2007)
Levels of Organization
a) Atomic level
b) Submicroscopic molecular level
c) Cellular level
d) Organism level

12. Which one of the following is an amine hormone? (AIPMT, 2008)
a) Progesterone
b) Thyroxine
c) Oxypurin
d) Insulin

13. Select one of the following of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms (AIPMT, 2008)
a) Embryo development and apical meristem
b) Absence of resin duct and leaf venation
c) Presence of vessel elements and absence of archegonia
d) Perianth and two integuments

14. Thermococcus, Methanococcus and Methanobacterium exemplify (AIPMT, 2008) a) Bacteria that contain a cytoskeleton and ribosomes
b) Archaebacteria that contain protein homologous to eukaryotic core histones
c) Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
d) Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

15. Which one of the following is heterosporous? (AIPMT, 2008) a) Equisetum
b) Dryopteris
c) Salvinia
d) Adiantum

16. In which one of the following male and female gametophytes do not have free living independent existence? (AIPMT, 2008)
a) Cedrus
b) Pteris
c) Funaria
d) Polytrichum

17. T.O. Diener discovered a (AIPMT, 2009)
a) free infectious DNA
b) infectious protein
c) bacteriophage
d) free infectious RNA

18. Monotreal Protocol aims at ? (AIPMT, 2009)
a) biodiversity conservation
b) control of water pollution
c) control of carbon dioxide emission
d) reduction of ozone depleting substances

19. Male and female gametophytes are independent and free living in ? (AIPMT, 2010)
a) mustard
b) castor
c) Pinus
d) sphagnum

20.Which one of the following is not used in organic farming ? (AIPMT, 2010)
a) Glomus
b) Oscillatoria
c) Snail
d) Earthworm
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Answers with Explanations
11. b) Submicroscopic molecular level (Levels of Organisation)
12. b) Thyroxine
13. c) Presence of vessel elements and absence of archegonia
14. c) Archaebacteria that lack any histones resembling those found in eukaryotes but
whose DNA is negatively supercoiled. 
15. c) Salvinia
16. a) Cedrus
17.d) free infectious RNA (Viriod)
18. d) reduction of ozone depleting substances
19. d) sphagnum
20.c) Snail
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