CBSE Final Exam 2011

Question : 1

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The cells lining the blood vessels belong to the category of

Options:

	Columnar epithelium
	Connective tissue
	Smooth muscle tissue
	Squamous epithelium

Solution :

Ans. (4)
Sol. Simple squamous epithelium is present where
diffusion and filtration is required. Cells lining our
blood vessels belong to the category of simple
squamous epithelium.

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Question : 2

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Consider the following statements (A-D) about organic farming

A. Utilizes genetically modified crops like Bt cotton

B. Uses only naturally produced inputs like compost

C. Does not use pesticides and urea

D. Produces vegetables rich in vitamins and minerals

Which of the above statements are correct?

Options:

	(B) and (C) only
	(A) and (B) only
	(B), (C) and (D)
	(C) and (D) only

Solution :

Ans. (1)
Sol. Organic farming is a zero waste cyclical procedure,
where waste from one process are cycled in as
nutrient for other process.

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Question : 3

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Select the correct statement with respect to diseases and immunisation

Options:

	Certain protozoans have been used to mass produce hepatitis B vaccine
	Injection of snake antivenom against snake bite is an example of active immunisation
	If due to some reason B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
	Injection of dead / inactivated pathogens causes passive immunity

Solution :

Ans. (3)
Sol. Clone of B-cells is called as plasma cells which
produce antibodies. Helper T-cells secrete IL-2
(interleukin-2) which stimulate B cells to produce
antibodies. Injection of snake antivenom against
snake bite is an example of artificially acquired
passive immunity.

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Question : 4

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Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because

Options:

	Megaspores possess endosperm and embryo surrounded by seed coat
	Embryo develops in female gametophyte which is retained on parent sporophyte
	Female gametophyte is free and gets dispersed like seeds
	Female gametophyte lacks archegonia

Solution :

Ans. (2)
Sol. Both are heterosporous genera; archegonia are
present in both cases.

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Question : 5

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Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

Options:

	Goat
	Frog
	Sparrow
	Lion

Solution :

Ans. (3)
Sol. Sparrow can be herbivorous (eating seeds and
fruits) or carnivorous (eating insects).

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Question : 6

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Which one of the following is essential for photolysis of water?

Options:

	Copper
	Boron
	Manganese
	Zinc

Solution :

Ans. (3)

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Question : 7

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What happens during fertilisation in humans after many sperms reach close to the ovum?

Options:

	Cells of corona radiata trap all the sperms except one
	Only two sperms nearest the ovum penetrate zona pellucida
	Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
	All sperms except the one nearest to the ovum lose their tails

Solution :

Ans. (3)
Sol. At the time of fertilisation secretions of acrosome
helps one sperm to enter the cytoplasm of ovum
through zona pellucida.

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Question : 8

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Bulk of carbon dioxide (CO₂) released from body tissues into the blood is present as

Options:

	70% carbamino-haemoglobin and 30% as bicarbonate
	Carbamino-haemoglobin in RBCs
	Bicarbonate in blood plasma and RBCs
	Free CO2 in blood plasma

Solution :

Ans. (3)
Sol. 20-25% of CO₂ is transported by RBCs in the form
of carbamino hemoglobin. Whereas, 70% is carried
as bicarbonate about 7% of CO₂ is carried in a
dissolved state in plasma.

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Question : 9

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In mitochondria, protons accumulate in the

Options:

	Intermembrane space
	Matrix
	Outer membrane
	Inner membrane

Solution :

Ans. (1)
Sol. Protons from complex I, III and IV of respiratory e^–  transport moves to PMS, creating proton gradient.

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Question : 10

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The unequivocal proof of DNA as the genetic material came from the studies on a

Options:

	Viroid
	Bacterial virus
	Bacterium
	Fungus

Solution :

Ans. (2)
Sol. Hershey and Chase worked with viruses that
infect bacteria (i.e., bacteriophages).

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Question : 11

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Whorled simple leaves with reticulate venation are present in

Options:

	China Rose
	Alstonia
	Calotropis
	Neem

Solution :

Ans. (2)
Sol. Neem – Compound leaf; Calotropis – opposite
phyllotaxy; China rose – alternate phyllotaxy.

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Question : 12

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Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

Options:

	Peak P and Peak R together – systolic and diastolic blood pressures
	Peak P – Initiation of left atrial contraction only
	Complex QRS – One complete pulse
	Peak T – Initiation of total cardiac contraction

Solution :

Ans. (3)
Sol. The P-wave represents depolarisation of atria,
which leads to the contraction of both atria.
QRS wave represents depolarisation of atria which
initiates ventricular contraction. There is one
ventricular contraction during one heart beat as
heart beat rate is equal to pulse rate, so QRS
complex represents one complete pulse.

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Question : 13

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Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non-matching pair.

Options:

	1
	2
	3
	4

Solution :

Ans. (4)
Sol. Clavicle and glenoid cavity are a part of pectoral
girdle.

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Question : 14

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What is common between vegetative reproduction and Apomixis?

Options:

	Both occur round the year
	Both produces progeny identical to the parent
	Both are applicable to only dicot plants
	Both bypass the flowering pha

Solution :

Ans. (2)
Sol. Both processes do not involves meiosis and
syngamy.

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Question : 15

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Read the following statement having two blanks (A and B)

"A drug used for ___(A)___ patients is obtained from a species of the organism ___(B)___ ." The one correct option for the two blanks is

Options:

	1
	2
	3
	4

Solution :

Ans. (4)
Sol. Cyclosporin drug is obtained from the fungus
Trichoderma and is used in organ-transplantation.

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Question : 16

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Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

Options:

	Only one X chromosome
	One X and one Y chromosome
	Two X chromosome
	Only one Y chromosome

Solution :

Ans. (3)
Sol. In human female
2n = 46
= 44 + XX

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Question : 17

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The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone.

Options:

	Adrenaline
	Melatonin
	Calcitonin
	Prolactin

Solution :

Ans. (2)
Sol. The 24 hour (diurnal) rhythm of our body such as
the sleep wake cycle is regulated by melatonin
hormone.

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Question : 18

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Which one of the following pairs is wrongly matched while the remaining three are correct?

Options:

	Bryophyllum – Leaf buds
	Agave – Bulbils
	Penicillium – Conidia
	Water hyacinth – Runner

Solution :

Ans. (4)
Sol. Water hyacinth – Offset.

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Question : 19

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Function of companion cells is

Options:

	Loading of sucrose into sieve elements by passive transport
	Loading of sucrose into sieve elements
	Providing energy to sieve elements for active transport
	Providing water to phloem

Solution :

Ans. (2)
Sol. Companion cell maintains pressure gradient in
sieves.

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Question : 20

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Which one of the following is not considered as a part of the endomembrane system?

Options:

	Vacuole
	Lysosome
	Golgi complex
	Peroxisome

Solution :

Ans. (4)
Sol. Endomembrane system involves – Golgi, ER,
vacuole and lysosome.

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Question : 21

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In Kranz anatomy, the bundle sheath cells have

Options:

	Thin walls, no intercellular spaces and several chloroplasts
	Thick walls, many intercellular spaces and few chloroplasts
	Thin walls, many intercellular spaces and no chloroplasts
	Thick walls, no intercellular spaces and large number of chloroplasts

Solution :

Ans. (4)
Sol. Thin walls with few chloroplast is character of
mesophyll cells in C₄ plants.

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Question : 22

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Sweet potato is homologous to

Options:

	Ginger
	Turnip
	Potato
	Colocasia

Solution :

Ans. (2)
Sol. Turnip – Modified tap root for food storage.
Sweet potato – Modified adventitious root for food
storage.

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Question : 23

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Ureters act as urinogenital ducts in

Options:

	Frog’s both males and females
	Frog’s males
	Human males
	Human females

Solution :

Ans. (2)
Sol. Ureters act as urinogenital duct in male frog. In
human beings urethra acts as male urinogenital
duct.

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Question : 24

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Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort ?

Options:

	One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
	The lungs can be made fully empty by forcefully breathing out all air from them
	One can breathe out air totally without oxygen
	One can breathe out air through eustachian tubes by closing both the nose and the mouth

Solution :

Ans. (1)

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Question : 25

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Read the following four statements (A-D) about certain mistakes in two of them

(A) The first tranrgenic buffalo Rosie produced milk which was human alpha-lactalbumin enriched

(B) Restriction enzymes are used in isolation of DNA from other macro-molecules

(C) Downstream processing is one of the steps of R-DNA technology

(D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host

Which are the two statements having mistakes?

Options:

	Statements (A) and (C)
	Statements (A) and (B)
	Statements (B) and (C)
	Statements (C) and (D)

Solution :

Ans. (2)
Sol. In statement A, the first transgenic cow was
named as Rosie. In Statement B, Restriction
endonucleases are used for cutting the DNA at
specific points.

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Question : 26

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The pathogen Microsporum responsible for ringworm disease in humans belongs to the same Kingdom of organisms as that of

Options:

	Rhizopus, a mould
	Ascaris, a round worm
	Taenia, a tapeworm
	Wuchereria, a filarial worm

Solution :

Ans. (1 )
Sol. Microsporum which causes ringworm disease is a
fungus.

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Question : 27

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Which one of the following techniques made it possible to genetically engineer living organisms

Options:

	Heavier isotope labelling
	Hybridization
	Recombinant DNA techniques
	X-ray diffraction

Solution :

Ans. (3)

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Question : 28

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"Good ozone" is found in the

Options:

	Stratosphere
	Ionosphere
	Mesorphere
	Troposphere

Solution :

Ans. (1)
Sol. Tropospheric ozone is bad ozone.

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Question : 29

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Guttation is the result of

Options:

	Osmosis
	Root pressure
	Diffusion
	Transpiration

Solution :

Ans. (2)
Sol. Root pressure leads to both guttation and bleeding.

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Question : 30

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Biodiversity of a geographical region represents

Options:

	Genetic diversity present in the dominant species of the region
	Species endemic to the region
	Endangered species found in the region
	The diversity in the organisms living in the region

Solution :

Ans. (4)
Sol. Biodiversity represents the sum total of variations
in all components of biosphere.

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Question : 31

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At metaphase, chromosomes are attached to the spindle fibres by their

Options:

	Kinetochores
	Centromere
	Satellites
	Secondary constrictions

Solution :

Ans. (1)
Sol. Kinetochore-site of attachment of spindles.

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Question : 32

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Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?

Options:

	Clostridium butylicum - lactic acid
	Aspergillus niger - citric acid
	Yeast - statins
	Acetobacter aceti - acetic acid

Solution :

Ans. (1)
Sol. Clostridium butylicum- Butyric acid.

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Question : 33

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Silencing of mRNA has been used in producing tranrgenic plants resistant to

Options:

	White rusts
	Bacterial blights
	Bollworms
	Nematodes

Solution :

Ans. (4)
Sol. Silencing of m-RNA has been used in producing
transgenic plants resistant to nematoda,
Meloidegyne incognita.

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Question : 34

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Which one of the following statements is totally wrong about the occurrence of notochord while the other three are correct

Options:

	It is absent throughtout life in humans from the very beginning
	It is present througout life in Amphioxus
	It is present only in larval tail in As
	It is replaced by a vertebral column in adult frog

Solution :

Ans. (1)
Sol. Notochord is present in the embryonic
development of all chordates but in vertebrates it
is replaced by vertebral column.

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Question : 35

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The technique called gamete intrafallopian transfer (GIFT) is recommended for those females

Options:

	Whore cervical canal is too narrow to allow passage for the sperms
	Who cannot provide suitable environment for fertilisation
	Who cannot produce an ovum
	Who cannot retain the foetus inside uterus

Solution :

Ans. (3)
Sol. GIFT is gamete intrafallopian transfer. In this
gametes are transferred into the fallopian tube of
females.

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Question : 36

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Common cold is not cured by antibiotics because it is

Options:

	Caused by a Gram-negative bacterium
	Not an infectious disease
	Caused by a virus
	Caused by a Gram-positive bacterium

Solution :

Ans. (3)
Sol. Common cold is not cured by antibiotics because it
is caused by virus. Viral diseases cannot be
treated by antibiotics as they lack cell wall.

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Question : 37

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Which one of the following options gives the correct matching of a disease with its causative organism and mode of infection

Options:

	1
	2
	3
	4

Solution :

Ans. (4)

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Question : 38

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Frogs differ from humans in possessing

Options:

	Nucleated red blood cells
	Thyroid as well as parathyroid
	Paired cerebral hemispheres
	Hepatic portal system

Solution :

Ans. (1)

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Question : 39

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Test cross in plants or in Drosophila involves crossing

Options:

	The F1 hybrid with a double recessive genotype
	Between two genotypes with dominant trait
	Between two genotypes with recessive trait
	Between two F1 hybrids

Solution :

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Question : 40

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The logistic population growth is expressed by the equation

Options:

	dN/dt = rN

Solution :

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Question : 41

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Examine the figure given below and select the right option giving all the four parts (a, b, c, d) correctly identified

Options:

	1
	2
	3
	4

Solution :

Ans. (3)
Sol. Female plant of Marchantia is given.

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Question : 42

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About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH-surge) normally occurs

Options:

	5th day
	11th day
	14th day
	20th day

Solution :

Ans. (3)

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Question : 43

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In history of bilogy, human genome project led to the development of?

Options:

	Bioinformatics
	Biosystematics
	Biotechnology
	Biomonitoring

Solution :

Ans. (1)
Sol. HGP was closely associated with the rapid
development of a new area in biology called as
bioinformatics.

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Question : 44

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Which one of the following correctly represents the normal adult human dental formula?

Options:

Solution :

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Question : 45

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The type of muscles present in our

Options:

	Thigh are striated and voluntary
	Upper arm are smooth muscle fibres fusiform in shape
	Heart are involuntary and unstriated smooth muscles
	Intestine are striated and involuntary

Solution :

Ans. (1)
Sol. The type of muscles present in our thigh are
striated/voluntary/skeletal.

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Question : 46

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Which one of the following is not an essential mineral element for plants while the remaining three are?

Options:

	Cadmium
	Phosphorus
	Iron
	Manganese

Solution :

Ans. (1)
Sol. Cadmium- non essential element, heavy metal
causing itai-itai disease.

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Question : 47

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Consider the following four statements whether they are correct or wrong?

(A) The sporophyte in liverworts is more elaborate than that in mosses

(B) Salvinia is heterosporous

(C) The life-cycle in all seed bearing plants is diplontic

(D) In Pinus male and female cones are borne on different trees

The two wrong statements together are

Options:

	Statements (B) and (C)
	Statements (A) and (B)
	Statements (A) and (C)
	Statements (A) and (D)

Solution :

Ans. (4)
Sol. Sporophyte is more elaborate in mosses as compared
to liverworts; Pinus is a monoecious plant.

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Question : 48

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Consider the following four statements (A-D) related to the common from Rana tigrina, and select the correct option stating which ones are true (T) andwhich ones are false (F).

Statements:

(A) One dry land it would die due to lack of O₂ if its mouth is forcibly kept closed for a few days.

(B) It has four chambered heart.

(C) On dry land it turns uricotelic from ureotelic.

(D) Its life history is carried out in pond water.

Options :

Options:

	1
	2
	3
	4

Solution :

Ans. (1)