Question # 1

Retroviruses cause tumors in

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Rodents

Fowls

Cats

All

The succession which occurs in dry soil or rock is

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Hydrosere

Xerosere

Decrosere

All of these

Animals that have their body cavity filled with parenchyma are

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Acoelomates

Coelomates

Pseudocoelomates

Tunicates

The principal stages of this cycle are

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Ammonification

Nitrification

Assimilation

All of above

Genes for alpha and beta chains of hemoglobin are found on which chromosomes?

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Chromosome 16 alpha; chromosome 11 beta

Chromosome 11 alpha; chromosome 16 beta

Chromosome 11

Chromosome 16

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

Population is a localized group of individuals belonging to :

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same species

different species

same community

same stand

High calcium concentration in blood causes the stimulation of

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Parathormone

Calcitonin

T₃

T₄

Coniferous forests located at high latitude are called

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Boreal

Taiga

Tundra

Alpine

Which of the following is not true about biotic components

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Producers

Consumers

Decomposers

Atmosphere

Lichens have thick crust and live in extreme conditions is a successional stage of

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Foliage lichen

Crustose lichen

Moss stage

All of these

Crystallization of viruses was done by _____ for the first time

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Ivanowsky

Twort

Stanley

Robert Koch

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

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Decreases

Increases

Remain constant

Sometime increases sometime decrease

Archaeobacteria could tolerate temperatures up to :

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140°C

120°C

95°C

70°C

bare rocks are the habitats of

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Mosses

Lichens

Grasses

Trees

Regional ecological community of plants & animals primarily determined by climate

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Biome

Niche

Habitat

Both b & c

Insulin receptors are present in

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Cytoplasm of muscle cells

Cell membrane of liver cells

Cell membrane of muscles and liver cells

Cell membrane of all body cells

Allele for whiteness in Drosophila is :

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Recessive

Codominant

Dominant

Partially Dominant

The amount of energy left after plants have met their respiratory needs shows up the plant:

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Not productivity

Gross productivity

Secondary productivity

Bio energy

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

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

Over-grazing may lead to:

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Desert

Tundra

Taiga

Grassland

Plants growing on dry habitat is called:

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Hydrophytes

Mesophytes

Xerophytes

None of these above

The total amount of energy fixed by plants is ______ productions

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Gross primary

Net primary

Secondary

All of the above

Oxidative metabolism is carried out ____ of mitochondria

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In the intramembrane space

On the surface of inner membrane

In the inside of outer membrane

In the matrix

Pick up the correct statement about the following figure:

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2.Nucleolus, 4.Golgi apparatus, 10.cytoplasm, 7.Mitochondria

2.Nucleolus, 7.cell membrane, 9.cytoplasm, 7.Mitochondria

2.Nucleolus, 4.Golgi apparatus, 5.cytoplasm, 7.Mitochondria

2.Nucleolus, 4.Golgi apparatus, 10.cytoplasm, 7.Centriole

The prokaryotes may have arisen more than

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420 million years ago

42 billion years ago

3.5 billion years ago

1.5 billion years ago

Normal fruit flies have

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White eyes

Bright red eyes

Light red eyes

Black eyes

The concept that all living things came into existence in their present forms especially created by Nature is called as

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Theory of special creation

Theory of special selection

Theory of natural creation

Theory of natural selection

Enzymes cannot work in which of the following

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Aqueous medium

Dry medium

Acidic medium

Alkaline medium

"Litho" means

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Air

Earth / soil

Water

All of these

The simplest reflex circuit includes___ elements

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1

2

3

4

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

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linkage

crossing over

independent assortment

dominance

It is not a steroid hormone

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Epinephrine

Estrogen

Progesterone

17 β hydoxy Testosterone

It is not a symptom of AIDS

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Swollen lymph nodes

Loss of immunity

Swollen neck

Pneumonia

Ventral root of the spinal nerve contains

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Sensory nerve fibres

Motor nerve fibres

Mixed nerve fibres

All

Dams and canal networks developed for irrigation purpose in Pakistan and many other countries create the problems of

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Salinity and soil erosion

Salinity and water logging

Soil depletion and water erosion

Soil erosion and depletion

Three principal stages of nitrogen cycle are:

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Ammonification, Nitrification, and Assimilation

Ammonification, Acidification, and Assilimlation

Esterification, Nitrification, and Assimilation

Ammonification, Nitrification, and Denitrification

It is an animal, but it does not have nerve or muscle tissue. It is neither diploblastic nor triploblastic. It is probably a

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Flatworm

Nematode

Cnidarian

Sponge

The living organisms, which cannot prepare their own food but obtain ready-made food form others, are:

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primary and secondary consumers

secondary and tertiaryconsumers

only primary consumers

consumers

Sahara Desert i found in :

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Europe

America

Africa

Australia

Due to the trampling of the soil layer by the hooves of grazing animals the rain water will:

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Penetrate deep into the soil

Not penetrate this soil

Stop on the soil

Do not affect this layer of the soil

It acts on smooth muscles

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Insulin

Glucagon

Cortisol

Oxytocin

Animals are

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Producers

Consumers

Decomposers

Non of the above

Which one of the following is true

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Population is a larger unit than a community

Bioshpere is a smaller unit than a biome

Biome and community are equal units

Biome is a larger unit than population

Among the scientists who believed in divine creation as

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Darwin

Carolous Linnaeous

Lamarck

Wallace

Iron, iodine and zinc required by the organisms are said to the:

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Macronutrients

Micronutrients

Moderate nutrients

Assimilation

Major unit of ecology is :

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Ecosystem

Community

Biosphere

Population

F. Sanger was the first scientist who determined the ___ structure of a protein molecule

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Primary

Secondary

Tertiary

Quaternary

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

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Arthropoda

Bivalvia

Gastropoda

Cephalopoda

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

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Nitrogen

Phosphorus

Sulphur

Iron

According to fluid mosaic model of cell membrane

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The most common type of molecules in the membrane are proteins

Basic membrane structure results from how proteins interact with water

The membrane is highly mobile mixture of phospholipids and proteins

The unique properties of cell types are determined by their phospholipids

The hormones which share common hypothalamic factor are

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FSH and LH / ICSH

ACTH and GH

ICSH and LTH

Prolactin and FSH

______form the raw material for coenzyme

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Nucleic acid

Lipids

Vitamins

Proteins

The term ecology originally was used in 1866 by the German zoologist:

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Charles Eton

Ernst Haeckel

Joseph Grinnell

Carolus linnaeus

Tape worm is the example of

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Endoparasite

Ectoparasite

Outer parasite

All of above

Which of the following things were not collected by Darwin?

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Specimens of diverse faunas and floras of south America

South American fossils

13 types of finches

Turtles

The nutrient cycles are also called as

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Biogeochemical cycles

Biochemical cycles

Geo-cycles

All of above

Following enzymes are indicating the specificity of their action in their names, except

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Sucrase

Amylase

Pepsin

Lipase

Which region of the nucleolus has DNA?

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Central fibrillar region

Central granular region

Peripheral granular region

Peripheral fibrillar region

Succulent plants are

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Xerophytes

Mesophytes

Hydrophytes

None of above

Between 80 to 90% of the original energy is lost as heat as a byproduct of

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Photosyntheis

Urine

Respiration

All of the above

Plants growing in extreme cold soil are called:

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Sciophytes

Psychrophytes

Heliophytes

Cyanophytes

In limnetic zone the phytoplankton are:

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Cyanobacteria

Protozoan

Fungi

Bacteria

Succinic acid differs from malonic acid by

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OH

CH₂

CH₃

CHO

Nucleotide is to ___ as amino acid is to ___

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Nucleic acids, Lipids

Nucleic acids, Proteins

Proteins, Lipids

Lipids, proteins

Which of the following acts as a bridge between enzyme and substrate?

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Activator

Cofactor

Prosthetic group

Apo-enzyme

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

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Negative feedback

Positive feedback

Primary feedback

None

Vector for spread of African sleeping sickness is

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Anopheles

Commonhouse fly

Tse-tse fly

Honey bee

Which of the following cross is carried to check the genotype of an individual showing a dominant phenotype

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Check cross

Test Cross

Criss cross

Self cross

In deoxyribose, oxygen is removed from carbon number

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1

2

3

4

Succession ends with a diverse and relatively stable:

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Xerosere

Derosere

Pioneers

Climax community

Prosthetic groups are

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Radicals

Inorganic molecules

Organic molecules

Metal ions

Which of the following is a distinguishing character of sponges

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Tentacles

Ceoleteron

Choanocytes

Calcareous skeleton

Plants growing in xeric (dry) condition are called:

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Hydrophytes

Xerophytes

Mesophytes

Derophytes

Elements required in large amount are called

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Micronutrient

Macronutrient

Organic elements

Inorganic elements

Basically, all animals depend on plants for their:

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Living

Food

Life

Respiration

There is an association between two organisms, which brings benefits to both the organisms

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Predation

Symbiosis

Parasitism

None of above

SRY in located at the tip of

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Short arm of X-chromosome

Short arm of Y-chromosome

Long arm of Y-chromosome

Long arm of X-chromosome

The chemical elements essential for life in living organisms are called:

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Biogenic elements

Nutrient elements

Both a & b

Genetic elements

Macronutrients are required by the organisms in:

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Small amount

Large amount

Traces

Never required