A/L BIOLOGY MCQ 1. Adaptation is a characteristic feature of living beings.
Which one of the following can be considered as a physiological adaptation?
(1) Sunken stomata in
leaves of xerophytes.
(2) Synthesizing more melanin in human skin when exposed to
sun light.
(3) Presence of a nictitating membrane of burrowing animals.
(4) Hiding of crocodiles among dry leaves on river banks
during drought season.
(5) Webbed feet of aquatic birds.
2. Which of the following combination of characteristics are
more important to a polysaccharide to be considered it as a food storing
substance?
(1) Polarity, Insolubility to a certain extent and
Hydrolyzing when needed
(2) Insolubility to a certain extent, Hydrolyzing when
needed and compact packing of molecules.
(3) Insolubility to a certain extent, Reactivity and
Hydrolyzing when needed.
(4) Polarity, Reactivity and Hydrolyzing when needed.
(5) Reactivity, Hydrolyzing when needed and compact packing
of molecules.
3. Which of the
following pair is not matched with each other?
(1) Nucleoprotein - Nucleic acid
(2) Chromo protein - Pigment
(3) Lipoprotein - Lipid
(4) Glycoprotein - Glucose
(5) Flavoprotein - Flavin Adenine Dinucleotide
4. Which one of the following is not a cause for the observations found in
Sudan III test for lipids?
(1) Colouring of lipid droplets with the red dye.
(2) Insolubility of lipid droplets.
(3) Low density of lipid than water.
(4) Making a complex with Sudan III by lipid droplets.
(5) Floating of lipid droplets on the surface of water.
5. Two strands of mRNA differ from one another,
(1) By the nature of sugar molecules in them.
(2) By the nature of nitrogenous bases in them.
(3) By the nature of the sugar phosphate bonds in them.
(4) According to the condensation reactions occurred when
nucleotides are bonded together.
(5) According to the base sequence of them.
6. Which is the false
statement regarding RNA
(1) The amount of RNA molecules will depend on the amount of
synthesizing protein.
(2) DNA is directly contributes to the synthesis of mRNA,
tRNA and rRNA.
(3) 80% of RNA found in cells is ribosomal RNA.
(4) The length of mRNA strand is equal to the length of the
DNA
strand which makes it.
(5) The same base sequence can be found in all the
eukaryotic rRNA.
7. Which one is not
occurred in mitotic division?
(1) Arranging of pairs of chomatids on the equator of the
spindle.
(2) Dividing of centromeres.
(3) Chromosomes get separated from each other and moving
towards the poles.
(4) Replication of DNA in chromosomes.
(5) Chromatids get separated from each other and moving
towards the poles.
8. At the anaphase of meiosis II,
(1) Centromeres divide into two.
(2) Homologous chromosomes move towards the poles.
(3) Chromosomes arrange on the equator of the spindle as
pairs.
(4) Chromatids arrange on the equator of the spindle.
(5) Nuclear envelope rearranges.
9. Some of the characteristics of prokaryotic cells are
given below.
A- Flagella B- Photosynthetic membrane C-plasmids D– Stored
food E- 70 s ribosome
The set of characteristics cannot be found always in a
prokaryotic cell is,
(1) C, D, E
(2) A, B, C
(3) A, B, D
(4) E, B, C
(5) D, A, E
10. Which of the following is not accurate regarding
microscopes?
(1) The objects separated from 200 nm can be identified by an
electron microscope but not by a light microscope.
(2) Two photographs of a plant cell of 2500 magnification,
of an electron microscope and light microscope are not similar in appearance.
(3) The resolving power of light waves is lesser than that
of electron waves.
(4) Electron microscope cannot be used to observe living
specimens.
(5) The light microscope is better than the electron
microscope in observing whole mounts.
11. Which one is the false statement regarding the fluid
mosaic model of cell membrane.
(1) The basic structure is a phospholipids bi-layer.
(2) Hydrocarbon tails face inwards and make a hydrophobic
interior.
(3) Some globular proteins are embedded across two layers of
the cell membrane.
(4) The two surfaces of the cell membrane are equal in
structure and function.
(5) The flexibility
of the membrane is increased by cholesterol.
12. An instance where hydrolysis of ATP occurs,
(1) In making pyruvate by 3C sugar phosphate.
(2) In the phosphorylation of sugar.
(3) In cyclic phosphorylation.
(4) In non-cyclic phosphorylation
(5) In oxidative phosphorylation
13. The efficiency of photosynthesis is decreased by
photorespiration in C3 plants due to the
(1) Formation of pyruvate by PEP.
(2) Carboxylation of RuBP
(3) Oxidation of PGA
(4) Oxidation of RuBP
(5) Conversion of a carboxylic group into an aldehyde.
Question number 14 and 15 are based on the following major
reactions occur in the aerobic respiration.
A- Carboxylation B- Hydrogenation
C- Phosphorylation of sugar
D- Hydrolysis of sugar
14. The reactions occur in glycolysis but not in Krebs cycle
are,
(1) A, B
(2) B, C
(3) D, B
(4) A, C
(5) C, D
15. The reactions occur in glycolysis and Krebs cycle both
are,
(1) A, B
(2) A, C
(3) A, D
(4) B, C
(5) B, D
16. Select the mismatching pair regarding the scientists and
their contribution towards the field of taxonomy.
(1) Carl Woese - Concept of domain
(2) Aristotle - Categorizing organism into three groups as
plants animals and microbes.
(3) Ernest Haeckel - Kingdom of protista
(4) Robert Whitaker - Classification of five kingdoms
(5) Carolus Linnaeus - Hierarchy of taxons
17. The group of organisms who uses inorganic carbon as
source of carbon and chemicals as source of energy is,
(1) Fungi
(2) Nitrifying bacteria
(3) Diatoms
(4) Decomposing bacteria
(5) Cyanobacteria.
18. A disease caused by the deficiency of potassium in
plants is,
(1) The premature death of leaves.
(2) Chlorosis
(3) Stunted growth of shoots.
(4) Dieback of shoots
(5) Stunted growth of roots
19. Which of the following is not a function of pancreatic
enzymes?
(1) Converting amylase into maltose.
(2) Converting lipids into fatty acids.
(3) Converting sucrose into glucose and fructose.
(4) Converting peptides into amino acids
(5) Converting proteins into amino acids
20. The secretion of secretin is stimulated by
(1) Gastrin hormone which reaches the duodenum
(2) Chyme which reaches the duodenum
(3) Bile which flows to the duodenum
(4) Secretion of CCK by the duodenum
(5) Stretching of the duodenal wall due to the food in it
21. A structure that does not help to get oxygen containing
air in is,
(1) Operculum
(2) Spiracle
(3) Nostril
(4) Mouth
(5) Pneumatophore
22. Which of the
following is a false statement?
(1) Gaseous exchange in respiration is done by diffusion in
all organisms.
(2) Annelids use blood to transport oxygen throughout the
body.
(3) Water is the source of oxygen in all aquatic organisms.
(4) The oxygen diffuses through the body covering is enough
when area/volume (A/V) ratio is greater than 1
(5) Some aquatic vertebrates have lungs and some have gills
as respiratory organs.
23. The respiratory structure found in both invertebrates
and vertebrates is
1) Book lungs
(2) Tube feet
(3) Tracheal system
(4) Body covering
(5) Lining of buccal cavity
24. A- smooth muscles
B- Connective tissues with yellow elastic fibers and white
fibers
C- Ciliated cells D- Goblet cells
Among above given things human alveoli contains
(1) Only A and B
(2) Only B and C
(3) A, B, C and D
(4) Only A, B and C
(5) Only B, C and D
25. The pair which does not match regarding proteins in
blood plasma and their functions
(1) Serum albumin _ Contributes to the solute potential of
blood.
(2) ฮฑ- globulin – Production of antibiotics
(3) Prothrombin _ Contributes to the clotting of blood
(4) Enzymes _ Catalyse metabolic activities
(5) ฮฒ- globulin _ Conduction of fat soluble vitamins
26. The false statement regarding red blood corpuscles
(1) Do not carry mitochondria.
(2) The life span is about 3 months.
(3) Aged red blood corpuscles are destroyed in spleen and
liver.
(4) Transporting
oxygen is used for their respiration.
(5) Red blood
corpuscles produce Ferritin when they get destroyed.
27. A cause which does not increase the rate of heartbeat
is,
(1) High temperature
(2) High pH value
(3) Secretion of adrenalin
(4) Secretion of noradrenalin
(5) Secretion of thyroxin
28. The false information regarding phloem translocation is,
(1) Large amount of substance is translocated through phloem
tissues
(2) The speed of translocation is high.
(3) The active phloem tissues used in translocation is
relatively high.
(4) A high pressure is generated within the sieve tube
elements at translocation.
(5) In some plants, the distance of translocation is about
100m.
29. Which of the following is correct regarding the
concentration of K +, Na+ , Cl- and organic anion (A- )
of the fluids, in and out of an axon at resting potential?
(1) The concentration of Na+ inside the axon is greater than
that of outside
(2) The concentration of K+ outside the axon is lesser than
that of inside
(3) The concentration of organic anion (A-)
inside the axon is greater than that of outside
(4) The concentration of organic anion (A-) in
inside and outside of axon is equal.
(5) The concentration of cations in inside and outside of
axon is equal.
30. Which of the following is a false statement?
(1) Autonomous nervous system is a part of the peripheral
nervous system
(2) All the spinal nerves are mixed nerves.
(3) Some of the cranial nerves are mixed and some are
sensory.
(4) Sympathetic nervous system contains both spinal and
cranial nerves.
(5) Sensory neurons are not found in autonomic nervous
system.
31. The structures
responsible for stimulating spermatogenesis, storing hormones and secreting
posterior pituitary hormones in sequence is
(1) Anterior pituitary, Hypothalamus, posterior pituitary
(2) Hypothalamus, posterior pituitary anterior pituitary,
(3) Anterior pituitary posterior pituitary Hypothalamus
(4) Posterior pituitary, anterior pituitary, Hypothalamus
(5) Hypothalamus, anterior pituitary, posterior pituitary
32. Not a commercial application of auxin
(1) For natural fruit setting
(2) For parthenogenesis
(3) To the growth of lateral buds
(4) To promote rooting of cuttings in vegetative
reproduction.
(5) To destroy weeds with broad leaves
33. The rate of renal filtration is not increased by,
(1) the dilation of afferent arteriole
(2) the constriction of efferent arteriole
(3) the increase in water potential in blood
(4) the increase in water potential in glomerular filtrate
(5) the increase of blood pressure
34. NH3, uric acid and urea are nitrogenous
excretory end products found in animal kingdom. Which set of animals shows the
above excretory end products in order?
(1) Fresh water fish, aquatic amphibian larvae and mammals
(2) Aquatic invertebrates, birds and adult amphibians
(3) Insects, mammals and aquatic amphibian larvae
(4) Fresh water fish, aquatic larvae of vertebrates,
amphibian larvae
(5) Adult amphibians, fresh water fish, reptilian
35. The animal taxon which does not contain water impermeable keratin substance in its boy covering is
(1) Aves
(2) Reptilia
(3) Insecta
(4) Amphibia
(5) mammalia
36. The three main types of skeletal systems found in animal
kingdom are hydrostatic skeleton, exoskeleton and endoskeleton. Which set of
animal taxon shows each of the above skeletal systems in order?
(1) Hiudinea, Gastropoda, Chodrihthyes
(2) Platyhelminthes, Arthopoda, Echinodermata
(3) Tematoda, Gastropoda, Mammalia
(4) Tubellaia, Anthozoa, Cephalopoda
(5) Nematoda, Schyohozoa, Echinoddermata
37. Which of the following is incorrect regarding growth
substance auxins
(1) Auxins are made continuously in young leaves and apical
meristems.
(2) Flow of auxins from apex to the base of the organ is
unidirectional.
(3) Auxins move laterally away from sunlight.
(4) The long-distance transport of auxins occurs mainly via
phloem.
(5) Enzymes do not have any effect on auxins
38. As a result of the first meiotic division in oogenesis,
(1) A matured primary
oocyte is produced.
(2) An oogonia cell is produced.
(3) A secondary oocyte is produced.
(4) two polar bodies are produced.
(5) A matured ovum is produced.
39. What is the false statement regarding Biogas
(1) Biogas is produced by a process of fermentation
(2) To generate biogas a mixture of microbes are used and
among them methanobacteria are more important.
(3) Biogas is a type of biofuel
(4) Biogas is generated by a process of aerobic digestion.
(5) Biogas contains gasses like methane, CO2, N2, H2 and H2S
40. A biological pesticide is,
(1) Thiobacillus ferooxidans
(2) Clostredium tetani
(3) Aspegillus oryzae
(4) Rhizobium
(5) Bacillus thurengiensis
Answers for Multiple Choice Questions
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1.(2)
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5.(5)
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9.(2)
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13. (4) | 17.(2)
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21.(1)
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25.(2)
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29.(2)
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33.(4)
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37.(5)
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2.(2)
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6.(4)
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10.(1)
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14. (5)
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18.(1)
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22.(3)
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26.(4)
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30.(4)
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34.(2)
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38.(3)
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3.(4)
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7.(3)
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11.(4)
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15. (1)
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19.(3)
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23.(4)
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27.(2)_
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31.(3)
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35.(3)
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39.(4)
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4.(4)
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8.(1)
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12.(2)
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16. (2)
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20.(2)
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24.(1)
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28.(3)
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32.(3)
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36.(1)
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40.(5)
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