Question # 1

Which one of the following enzymes have slightly acidic pH as optimum pH?

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Sucrase

Enterokinase

Pepsin

Catalase

Animals devoid of respiratory, excretory and circulatory organs are

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Tapeworms

Sponges

Earthworm

Live fluke

Green house effect, acid rain headaches and coughs are related to which of the followings?

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Oxides of nitrogen

Oxides of sulphur

CO

CFCs

Annual rainfall in grassland is about:

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250 to 650 mm

250 to 850 mm

250 to 450 mm

250 to 750 mm

Which of the following traist is transmitted directly from an affected to only its sons?

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autosomal

X-linked

Y-linked

X and Y linked

Most nitrogen moves from the soil into the roots in the form of:

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Nitrogen gas

Nitrites

Ammonia

Nitrates

Primary succession that starts on a dry habitat is called:

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Hydrosere

Derosere

Xerosere

Aquasere

Food web is the group of various

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Food substances

Food chains

Trophic levels

All of these

The average rainfall in desert ecosystem is:

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20 - 30 cm

20 - 40 cm

25 - 50 cm

14 - 35 cm

An organelle having no nucleic acid in its chemical composition is

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Lysosomes

Ribosomes

Centriole

Mitochondria

The major components of ecosystem are

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2

3

4

6

A phenotype which can't be expressed in heterozygous state but can only be expressed other in homo or hemi form, would be

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Dominant

Bombay

Recessive

Ordinary

The land will be turned to barren land if there is:

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Little grazing

Moderate grazing

Over grazing

None grazing

Succession begins by a few hardy invaders called:

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Founders

Initiators

Pioneers

Leaders

It is incorrect statement about hormones

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Endocrine secretion

Initiate metabolism

Organic

Transported by blood

A common animal of temperate deciduous forests is the:

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Kangaroo

Cat

Leopard

Rhesus Monkey

Rh factor or antigen was first studied in :

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Man

Owl

Monkey

Fish

Taj Mahal's marble has been affected by

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CFC's

Lead pollution

Acid rain

None

Similar groups of individuals who can interbreed and produce organisms of their own kind form a:

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population

community

species

succession

Succession starting in pond is called

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Hydrosere

Xerosere

Pioneers

None of these

The idea of inheritance of acquired characteristics was presented by

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Margulis

Lamarck

Linnaeus

Cuvier

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

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linkage

crossing over

independent assortment

dominance

The most common animal of phylum Aschelminthes is:

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Enterobuis vermicularis

Ascaris lumbricoides

Ancylostoma duodenale

Rhabditis

Which of the following is an example of ribozyme

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Aminopeptidase

Pancreatic lipase

Peptidyl transferase

Cytochrome oxidase

Animal cells differ from plant cells in having

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80 S ribosome

Chloroplasts

Mitochondria

Centrioles

Lamarck was incharge of invertebrate collection at Natural History Museum is

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Berlin

Paris

California

Brun

The bacteria in the root nodules fix ______ in soil air, converting it to amino acids

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Nitrogen

Phosphorus

Sulphur

Iron

When bacteria in soil oxidize ammonia or ammonium ions this is called:

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Oxidation

Denitrification

Ammonification

Nitrification

Which of the following has chitinous cuticle in the exoskeleton

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Arthropoda

Porifera

Echinodermata

Annelida

______ are autotrophic organisms

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Producers

Consumers

Decomposers

All of the above

Which of the following kind of inhibitors don’t compete for active site of enzyme

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Irreversible competitive

Reversible competitive

Reversible non competitive

Both b and c

Which of the following hypothesis involved the evolution of eukaryotic cell from a prokaryotic cell

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Endosymbiont hypothesis

Membrane invagination hypothesis

Vent hypothesis

Both A and B

Lichens are dual organisms composed of symbiotic association of algae living within a fungus:

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Mycelium

Sporangium

Hyphae

Rhizophore

The major unit of ecology is the:

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Physical component

Biotic component

Ecosystem

Logos

It acts on smooth muscles

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Insulin

Glucagon

Cortisol

Oxytocin

The gill pouches present in embryos of mammals :

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support that ontogeny recapitulates phylogeny

homologous structures

used by embryos to breathe

evidence for the degeneration

About ______% of solar energy is used to evaporate water, heat up soil and then lost to the outer space

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95

97

98

99

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

Diseases in living organisms which are caused by parasites are called

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Infestations

Infection

Fusion

All of above

Bacterial and fungi are mainly included in the group of

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Consumers

Decomposers

Producers

None of these

Wallace developed a Theory of Natural Selection similar to that of

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Lamarck

Linnaeus

Darwin

Lyell

According to endosymbiont hypothesis the aerobic bacteria developed into

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Lysosomes

Mitachondria

Chloroplast

Nucleus

STH promotes_____ after puberty

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Protein synthesis

Cell differentiation

Metabolism

Cell division

Pick up the false statement regarding HIV

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Lipoprotein envelope

Two RNA molecules

Two molecules of RT enzyme

Round shaped capsid

Which of the following sugar is abundant in muscle fibres

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Myoglobin

Starch

Glycogen

Oxygen

Topography is study of?

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Population

Individula

Earth

birds

Which characteristic is common in both cnidarians and flatworms

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Digestive system with a single opening

Dorsoventrally flattened bodies

Radial symmetry

Flame cells

Pre-chordates is another name used for

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Echinoderms

Protochordates

Cephalochordates

Hemichordates

Normal fruit flies have

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White eyes

Bright red eyes

Light red eyes

Black eyes

Ventral root of the spinal nerve contains

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Sensory nerve fibres

Motor nerve fibres

Mixed nerve fibres

All

Pick up the most developed coelomates

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Echinoderms

Annelids

Chordates

Insects

Terrestrial ecosystem have main types of ecosystem:

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Five

Four

Three

Two

Allele for whiteness in Drosophila is :

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Recessive

Codominant

Dominant

Partially Dominant

In each case succession begins with few hard invaders called:

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Producers

Consumers

Pioneers

Beginners

The oxygen concentration in the air is maintained by the green plants which release it during

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Fermentation

Respiration

Photosynthesis

Chemosynthesis

A change in one or more bases of DNA, which results in the formation of an abnormal protein is

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Moulting

Transformation

Mutation

Fission

These micro-organisms use the proteins and amino acids and release excess of ammonia (NH₃) or ammonium ions (NH₄). This process is known as

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Ammonification

Nitrification

Assimilation

All of above

The phage is called temperate when it causes

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Virulence

Lysis

Lysogeny

Bursting of host cell

Which enzyme deficiency leads to phenylketonuria

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Phenylalanine oxidase

Phenylalanine hydroxylase

Phenylalanine synthase

Phenylalanine carboxylase

Soil nitrogen resources are also strengthened by the addition of ______ by the man himself

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Nitrogen fertilizers

Nitrogen

Fertilizers

None of above

Air conditioners are the source of

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Effluents

SO₂,NO₂

Heavy metals

CFCs

Notochord is present throughout life in

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Urochordates

Chordates

Cephalochordates

Vertebrates

A process in which one organism get benefit from the relationship is known as

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Grazing

Commensalism

Symbiosis

Mutualism

The first person who argued from evidence that species were not created in their present form rather they had evolved from ancestral species was

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Aristotle

Lamarck

Darwin

Mendel

Nucleotide is to ___ as amino acid is to ___

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Nucleic acids, Lipids

Nucleic acids, Proteins

Proteins, Lipids

Lipids, proteins

What is done to monkeys by HIV

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Multiplication and disease

Infection and multiplication

Infection and disease

None

The last stage of plant succession is

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Pioneer

Climax

Community

None of above

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

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Virus

Fungi

Bacteria

Nematods

Chemical formula of pentose sugar present in DNA

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C₅H₉O₅

C₅H₁₀O₅

C₅H₁₀O₄

None

An isolated virus is not considered living, since it

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Separates into two inert parts

Cannot metabolize

Rapidly loses its genome

It coated with an air tight shield

A new system is developed after an existing ecosystem is called

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Primary ecosystem

Secondary ecosystem

Hydrosere

Xerosere

First invertebrate to develop a nervous system is

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Sponges

Cnidarians

Flat worms

Round worms

Mascara is a type of:

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Lion

Bird

Monkey

Bear

In a phospholipid molecule, phosphoric acid is attached to the carbon number_____ of glycerol.

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1

2

3

4

Provirus is

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Genome of bacteriophage

Genome of HIV uncoiled in Host cell

Genome of HIV incorporated in Host genome

Genome of a host

Predation is a process of

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Prey

Predator

Prey and predator

None of these

Radial symmetry is present in

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Adults of annelida

Adults of echinodermata

Adults of Cnidaria

Both B and C

They are Tumor causing viruses and are usually host specific

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Polio viruses

Retroviruses

Oncoviruses

Both b and c

Armadillos, the armoured mammals live only in :

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Asia

Europe

America

Africa

The desert ecosystem of western punjab is called:

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Thar

Thal

Alpine

Boreal

Which of the following organelle is not present in the synaptic knob

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Mitochondria

Vesicles

Ribosomes

Nucleus