Question # 1

The amount of DNA in _____ is one half to that of_____:

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Somatic cells, Germ cells

Osteocytes, Somatic cells

Germ cells, Somatic cells

Somatic cells, Gametocytes

Change in temperature from 30o C to 40o C in human body will cause ____ in rate of reaction

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Increase

Decrease

First increase then decrease

First increase then constant

We are reducing natural 'carbon dioxide's

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Sources

Sinks

Both

None

Resting membrane potential of a neuron is

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50mV

-70mv

-80mV

90mV

Which phenomenon reduces the chances of genetic recombination and variations among offspring ?

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linkage

crossing over

independent assortment

dominance

Which of the following is not an enzyme of HIV

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Reverse transcriptase

Integerase

Protease

Ligase

Plants growing in extreme cold soil are called:

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Sciophytes

Psychrophytes

Heliophytes

Cyanophytes

About 20 years ago what was the rate at which human population was increasing

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1%

2%

3%

5%

In littoral zone, the zooplanktons are:

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Protozoan and coelenterates

Protozoan and porifers

Protozoan and flatworms

Protozoan and crustacean

Food web is the group of various

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Food substances

Food chains

Trophic levels

All of these

In an ecosystem after succession, a new invaders are called

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Pioneers

Predecessors

Climax community

None of these

If six cells out of 10, do crossing over what will be percentage of cross over gametes

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60%

30%

40%

50%

All the organisms, primarily animals, which obtain energy directly or indirectly from the produces as ready-organic food are:

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Decomposers

Consumers

Detritivores

Scavengers

Loins are

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Primary consumers

Secondary consumers

Tertiary consumer

All of above

The simplest reflex circuit includes___ elements

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1

2

3

4

Function of succinic dehydrogenase is aided by

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Metal ion

Vitamin

NAD

FAD

The term ecology was first used by a ________ zoologist.

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American

Canadian

German

Greece

Eagle may eat blue bird, but blue bird eats insects like caterpillar and caterpillar feeds on grass or green leaves. This is a ______

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Food chain

Food web

Both A and B

None of above

Is is universally accepted by biologists that mammals have evolved from reptilian ancestors called …………

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Cotylosaurs

Dinosaurs

Cotylostomata

Amphibians

Elements required in large amount are called

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Micronutrient

Macronutrient

Organic elements

Inorganic elements

Hemophilia is a ________ disease

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Heritable

Genetic

Nutritional deficiency

Both a and b

Forest ecosystem is subdivided into ____ type of forests.

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Two

Four

Five

Three

Biotic components includes all the

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Nonliving components

Living components

Nonliving and living both

None of these

Triploblastic, unsegmented, acoelomates exhibiting bilateral symmetry and reproducing both asexually and sexually, with some parasitic forms are included in

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Annelida

Arthropoda

Platyhelminthes

Cnidaria

How may gene pairs contribute to the wheat grain colour?

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one

two

three

four

_____ is a good example of polymorphism

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Hydra

Obelia

Starfish

Euplectella

In coniferous alpine and boreal forests the winter is:

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Longer and little

Shorter and colder

Longer and colder

Shorter and little warmer

Chloroplasts and mitochondria differ from one another because

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Both are membranous organelles

Both are non-membranous organelles

Both are not present in all cells

Both do not contain proteins

What are the environmental buffers?

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Trees

Animals

Factories

Microbes

Enzymes cannot work in which of the following

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Aqueous medium

Dry medium

Acidic medium

Alkaline medium

The optimum temperature for most of the enzymes in human body is

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37 ^oC

35^oC

37 ^oF

98.6^oC

A symbiotic association between a fungus and the roots of higher plants is known as

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Lichen

Parasitism

Mycorrhiza

Commensalism

Bilirubin

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Turns skin Yellow

Damages brain cells

Causes jaundice

All of these

The root nodules bacteria fix ______ in sil air:

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Parasitism

Carbon dioxide

Nitrogen

Hydrogen

--------------- and --------------- have same number of chromosome

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Man, Chimpanzee

Chimpanzee, Potato

Man, Potato

Potato, Tomato

Food web maintains the stability of

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Environment

Biosphere

Ecosystem

Biotic components

Dominant plant species in grassland are:

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Graminoids

Trees

Climbers

Herbs

A heterrozygote offspring quantitatively exceeds the phenotypic expression of both the homozygote parents due to:

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dominance

incomplete dominance

over dominance

codominance

Mycorrhiza is an association between the roots of plants growing in acid soil and certain

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Virus

Fungi

Bacteria

Nematods

Which of the following acts as template strand for reverse transcription

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Viral DNA

Viral RNA

Host DNA

Host RNA

A Crista is made of -------- membrane

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Lipoprotein

Glycoprotein

Nucleoprotein

Phospholipids

The process by which the limited amount of nitrogen is circulated and recirculated throughout the world of living organisms is known as the

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Nitrogen cycle

Nitrogen path way

Nitrogen depletion

None of above

Which of the following is not a homopolysccharide?

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Starch

Chitin

Pectin

Glycogen

Essay on "Principle of population" was published by

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Cuvier

Mendel

Malthus

Darwin

______ is a group of interbreeding individuals occurring together in space and time

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Population

Species

Community

All of above

Enzymes present in human body generally have

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Same optimum temperature and optimum pH

Same optimum temperature but different optimum pH

Same optimum pH but different optimum temperature

Different optimum temperature and optimum pH

All populations within an ecosystem are known as a:

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Population

Community

Species

Clan

Nutrients required by organisms in small quantity or in trace amount like zinc, molybdenum, iron, iodine are:

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Macronutrients

Micronutrients

Mega Nutrients

Both a & c

The succession started on deserts is termed as

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Hydrosere

Xerosere

Derosere

None of the above

The inhibitor having structural similarity with substrate is

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Irreversible inhibitor

Reversible inhibitor

Competitive inhibitor

Noncompetitive inhibitor

When living and non-living interact to produce a stable system in which exchange of materiel with flow of energy takes place, it forms a/an:

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environment

ecosystem

stable community

ecological succession

Coniferous forests located at high latitude are called

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Boreal

Taiga

Tundra

Alpine

In tertiary structure, presence of hydrophilic amino acids at the surface of proteins and hydrophobic amino acids buried inside, indicate

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Nature of bonding

Function of protein

Nature of medium

Shape of protein

In temperature deciduous forest the average rainfall is:

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650 -1500 mm

750 -1500 mm

800 - 1600 mm

700 - 1500 mm

A blue cone monochormate

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Can perceivetwo colours

Can't perceiveany colour

Can perceive only blue colour

Can perceive only red colour

Glyosidic bond is formed by the

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Removal of Oxygen

Addition of Water

Addition of Oxygen

Removal of Water

In temperate grassland the rate primary production is about:

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700 - 1400 g/m²

700 - 1600 g/m²

700 -1800 g/m²

700 - 1500 g/m²

Most of the proteins are composed of _____ types of amino acids

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170

150

25

20

______form the raw material for coenzyme

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Nucleic acid

Lipids

Vitamins

Proteins

Parasitism is an association between a host and a parasite, which ivolves providing the parasite with:

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Food

Protection

Conditions for its survival

All a, b, c

Prosthetic groups are

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Radicals

Inorganic molecules

Organic molecules

Metal ions

Phosphorylation of glucose molecule in glycolysis is carried out by

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ATPase

Kinase

Isomerase

Transferase

Which level of protein structure is responsible for maintenance of helix shape of an enzyme

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Primary

Secondary

Tertiary

Quaternary

Viruses are not resistant to

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Interferons

Penicillin

Streptomycin

Any antibiotic

The tundra vegetation supports the animals called:

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lemmings

Marchpolo sheeps

Goats

None of these

Color blindness, haemophilia and gout form linkage group onj

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Chromosome 9

Chromosome 19

x-chromosome

y-chromosome

A group of interbreeding individuals of same species occurring together in space and time is called:

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Population

Community

Species

Clan

In littoral zone, the water is:

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Deeps

Very deep

Shallow

Comes with wave only

As the number of the predators decreases the numbering of prey:

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Decreases

Increases

Remain constant

Sometime increases sometime decrease

Food chains combine to form

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Large food chain

Large organisms

Trophic levels

Food web

Circulatory system is open type in all of the following, EXCEPT

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Arthropoda

Bivalvia

Gastropoda

Cephalopoda

All of the following are present in mitochondria, EXCEPT

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Cristae

Ribosomes

DNA

Thylakoids

The first comers in an area are termed as

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Consumers

Producers

Pioneers

All of above

Allele for whiteness in Drosophila is :

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Recessive

Codominant

Dominant

Partially Dominant

The average rainfall in desert ecosystem is:

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20 - 30 cm

20 - 40 cm

25 - 50 cm

14 - 35 cm

Archaeobacteria could tolerate temperatures up to :

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140°C

120°C

95°C

70°C

Population is a localized group of individuals belonging to :

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same species

different species

same community

same stand

Which of the following is true about mesoglea

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Acellular

Mesodermal

Cellular

Multicellular

Layer of earth where life is present is called

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Hydrosphere

Lithosphere

Biosphere

Topography

Sharp rise in LH output due to estrogens is an example of

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Negative feedback

Positive feedback

Primary feedback

None

The study of relationship of an organism to their environment is knows as:

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biology

ecology

zoology

mycology