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A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all the energy of ice gets converted into heat during its fall. The value of h is:

[Latent heat of ice is 3.4 x 105 J/kg and g = 10 N/kg]

Option: 1

34 km


Option: 2

544 km


Option: 3

136 km


Option: 4

68 km


Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats \left ( C_{p/C_{v}} \right ) of the mixture will be:

Option: 1

0.83


Option: 2

1.50


Option: 3

3.3


Option: 4

1.67


The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of:

Option: 1

Inactivation of glycosidase enzyme in recombinant bacteria


Option: 2

Non-recombinant bacteria containing beta-galactosidase


Option: 3

Insertional inactivation of alpha-galactosidase in non-recombinant bacteria


Option: 4

Insertional inactivation of alpha-galactosidase in recombinant bacteria


Satellite RNAs are present in some 

Option: 1

Plant viruses 


Option: 2

Viroids 


Option: 3

Prions 


Option: 4

Bacteriophages 


Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it ?

Option: 1

Biceps of upper arm - Smooth muscle fibres


Option: 2

Abdominal wall - Smooth muscle

 

 


Option: 3

Iris - Involuntary smooth muscle


Option: 4

Heart wall - Involuntary unstriated muscle


Which one of the following is the correct matching of the events occurring during menstrual cycle ?

Option: 1

Proliferative phase

: Rapid regeneration of myometrium and maturation of Graafian follicle.

                


Option: 2

Development of corpus luteum 

: Secretory phase and increased secretion of progesterone.

           


Option: 3

Menstruation

: breakdown of myometrium and ovum not fertilised.

                                


Option: 4

Ovulation 

: LH and FSH attain peak level and sharp fall in the secretion of progesterone.

                                  


Sickle cell anemia is:

Option: 1

caused by substitution of valine by glutamic acid in the beta globin chain of haemoglobin


Option: 2

caused by a change in a single base pair of DNA


Option: 3

characterized by elongated sickle like RBCs with a nucleus


Option: 4

an autosomal linked dominant trait


Stroma in the chloroplasts of higher plant contains:

Option: 1

Light-dependent reaction enzymes


Option: 2

Ribosomes


Option: 3

Chlorophyll


Option: 4

Light-independent reaction enzymes


Which one of the following is a vascular cryptogam?

Option: 1

Ginkgo


Option: 2

Marchantia


Option: 3

Cedrus


Option: 4

Equisetum


Montreal Protocol aims at:

Option: 1

Biodiversity conservation


Option: 2

Control of water pollution


Option: 3

Control of CO2 emission


Option: 4

Reduction of ozone depleting substances


The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because :

Option: 1

It reproduces parthenogenetically


Option: 2

A single mating produces two young flies


Option: 3

Smaller female is easily recognisable from larger male


Option: 4

It completes life cycle in about two weeks


What is [H^+] in mol/L of a solution that is0.20 M in CH_3COONa and in CH_3COOH?
K_a for CH_3COOH = 1.8 \times 10^{-5}.

Option: 1

9.0 \times 10^{-6}


Option: 2

3.5 \times 10^{-4}


Option: 3

1.1 \times 10^{-5}


Option: 4

1.8 \times 10^{-5}


The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

Option: 1

Photorespiration


Option: 2

Glycolysis


Option: 3

Fermentation


Option: 4

Aerobic respiration


Which one of the following is one of the characteristics of a biological community?

Option: 1

Sex-ratio


Option: 2

Stratification


Option: 3

Natality


Option: 4

Mortality


Some of the characteristics of Bt cotton are

Option: 1

High yield and resistance to bollworms


Option: 2

Long fibre and resistance to aphids


Option: 3

Medium yield, long fibre and resistance to beetle pests


Option: 4

High yield and production of toxic protein crystals which kill dipteran pests


In the following reaction

 C_{6}H_{5}CH_{2}Br\xrightarrow[H _{3 O^{+}}]{1.mg /ether}X 

the product 'X' is:

Option: 1

C_{6}H_{5}CH_{2}CH_{2}C_{6}H_{5}


Option: 2

C_{6}H_{5}CH_{2}OCH_{2}C_{6}H_{5}


Option: 3

C_{6}H_{5}CH_{2}OH


Option: 4

C_{6}H_{5}CH_{3}


CAM helps the plants in :

Option: 1

Reproduction


Option: 2

Conserving water


Option: 3

Secondary growth


Option: 4

Disease resistance


Which one of the following organisms is not an example of eukaryotic cells?

Option: 1

Amoeba proteus


Option: 2

Paramecium caudatum


Option: 3

Escherichia coli


Option: 4

Euglena viridis


What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

Option: 1

42


Option: 2

63


Option: 3

84


Option: 4

21


Which one of these animals is not a homeotherm ?

Option: 1

Camelus


Option: 2

Chelone


Option: 3

Macropus


Option: 4

Psittacula


Which of the following as not apomictic seed 

Option: 1

Citrus 


Option: 2

Mango 


Option: 3

Allium 


Option: 4

Guava 


Read the following statements and select the correct option

Statement 1.viviparous animals give better protection to their offsprings

Statement 2: In viviparous animals, young ones, after attaining a certain stage of growth, are delivered out of the body of female organism

Option: 1

Both statement 1and 2 are  correct


Option: 2

Statement 1 is correct but statement 2 is incorrect


Option: 3

Statement 1 is incorrect but statement 2 is correct

 


Option: 4

Both statements 1and 2 are incorrect


The structure with fleshy folds of tissue, which extends down from the mons pubis and surround the vaginal opening 

Option: 1

Clitoris 


Option: 2

Labia Majora 


Option: 3

Vaginal canal 


Option: 4

none of these 


Select correct statement . 

Option: 1

Xenagamy is type of pollination in which during pollination brings genetically different types of pollen grains to stigma 


Option: 2

Geitonogamy genetically similar to autogamy 


Option: 3

Majority of palnts use biotic agents for pollination 


Option: 4

All of these 


Select the correct statement : 

Option: 1

The vegetative cell is small and has less amount of reserved food 


Option: 2

The vegetative cell is large and has less amount of reserved food 


Option: 3

The generative cell is small and floating in cytoplasm of vegetative cell 


Option: 4

Both (b) and (c)


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