Question # 1

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

In case of sickle cell anemia, in place of glutamic acid, _________ is found

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Histidine

Valine

Proline

Leucine

Ribozyme is found in

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Mitochondria

Cytoplasm

Lysosomes

Ribosomes

What is the probability of having albino child if father and mother both are carrier(Aa)

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25%

30%

50%

75%

They may also control some long term changes

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Enzymes

Neurons

Hormones

CNS

An exchange of segments between non-sister chromatids of homologous chromosomes during meiosis is termed as

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Crossing over

Hopping

Taking over

Segregation

Prosthetic groups are

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Radicals

Inorganic molecules

Organic molecules

Metal ions

Which one of the following is an example of commensalism

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Nodulated roots

Remoras attached to sharks

Mycorrhiza

Commensalism

The term ecology was first used by a ________ zoologist.

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American

Canadian

German

Greece

The term originally was coined by the German zoologist Ernst Haeckel in

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1666

1766

1966

1866

Essay on "Principles of geology" was published by

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Wallace

Malthus

Lyell

Cuvier

The dominance relations of a 4 O'clock plant can be described in terms of

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Complete dominance

Incomplete dominance

Partial dominance

Both B and C

Which of the following is not true about biotic components

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Producers

Consumers

Decomposers

Atmosphere

The relationship of a single population towards its environment is called

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Ecology

Synecology

Autoecology

All of foregoing

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

A collection of related parts that function as a unit is called:

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Organ

Organism

System

Individual

A process in which green plants are eaten by animals is called

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Grazing

Predation

Commensalization

None of these

Succession starting in pond is called

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Hydrosere

Xerosere

Pioneers

None of these

All of the following are present in mitochondria, EXCEPT

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Cristae

Ribosomes

DNA

Thylakoids

Aerosol spray foams are potential sources of

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Carbon monoxide

Sulphur dioxide

Chlorofluorocarbons (CFCs)

Lead compounds

Most of the plant cells lack following organelles EXCEPT

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Flagellum

Lysosome

Centriole

Mitochondria

Which is correct about myelin sheath

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It speeds up conduction

It is found in all axons

It is found in all dendrites

It is proteinaceous only

The bond formed between glucose and fructose to form sucrose

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α 1 , 4 Glycosidic bond

β 1 , 4 Glycosidic bond

α 1 , 2 Glycosidic bond

β 1 , 2 Glycosidic bond

When bacteria break down nitrates and release nitrogen back into atmosphere this process is called:

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Nitrification

Denitrification

Ammonification

Deamination

When a haemophilic carrier woman marries a normal man, who among her offspring may be affected

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all her children

all her daughter

half of her daughter

half of her sons

Which component of the cell is mainly concerned with production of cell secretions?

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Ribosome

Cytoskeleton

Mitochondria

Golgi

Pick up the wrong statement from the following

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Oils are lighter than water

Animal fats are solid at room temperature

Specific gravity of fats is higher than water

Fats containing saturated fatty acids are solid

This is an association between a host and a parasite

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Predation

Anemies

Parasitism

None of above

First invertebrate to develop a nervous system is

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Sponges

Cnidarians

Flat worms

Round worms

Plant and animals replace the earlier ones in a way of

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Community relay

Succession

Predecessors

All of these

Cells recycle their dead parts with the help of

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Centrioles

Vacuoles

Lysosomes

Golgi apparatus

Which one of the following is associated with intracellular transport of material?

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Golgi apparatus

Centriole

Endoplasmic reticulum

Lysosome

Succession begins by a few hardy invaders called:

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Founders

Initiators

Pioneers

Leaders

In this type of relationship only one organism benefits from the relationship. The other is not affected at all

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Mutualism

Commensalism

Parasitism

All of above

Depolarization of neural membrane is due to

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Influx of K+

Efflux of Na+

Influx of Na+

None

Sahara Desert i found in :

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Europe

America

Africa

Australia

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

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Negative feedback

Positive feedback

Primary feedback

None

Community structures of an ecosystem is called

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Biosphere

Succession

Progression

Climax community

Which can convert glucose to glucose 6 phosphate

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Hexokinase

Glucokinase

Phospho fructokinase

Both a & b

Plants growing on dry habitat is called:

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Hydrophytes

Mesophytes

Xerophytes

None of these above

Several bacteria in soil are able to oxidize ammonia or ammonium ions, this oxidation is known as:

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Ammonification

Nitrification

Denitrification

Amino-oxidation

Which one of the following always contains DNA?

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Centriole

Lysosome

Golgi apparatus

Mitochondrion

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

If the distance of 20 map units is found among two linked loci what would be the percentage of cross gametes

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40%

60%

20%

10%

A little light is left to power photosynthesis at the depth of:

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500 feet

700 feet

600 Feet

1000 Feet

Soyabeans have been made resistant to a common

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Insecticide

Herbicide

Fungicide

Pesticide

______ incorporate gaseous nitrogen from air into organic nitrogen containing compounds

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Nitrogen fixing bacteria

Nitrogen degrading bacteria

Both A and B

None of above

Part of brain that is involved in learning

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Cerebrum

Thalamus

Cerebellum

Pons

An exchange of segments between non-sister chromatids of homologous chromosomes during meiosis is termed as :

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Crossing over

Hopping

Taking over

Segregation

Nutrients required by organism in large amount like water, carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur and calcium are:

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Macronutrients

Micronutrients

Mega Nutrients

Both a & c

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

What are the environmental buffers?

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Trees

Animals

Factories

Microbes

Substances cross the cell membrane more easily when they are

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water soluble

protein soluble

alcohol soluble

lipid soluble

Much of nitrogen found in the soil is the result of:

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Degeneration

Decomposition

Denitrification

Assimilation

Bacterial and fungi are mainly included in the group of

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Consumers

Decomposers

Producers

None of these

In free state Glucose is present in:

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Grapes

Dates

Figs

All Fruits

The soil of the deciduous forest is:

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Yellow

Grayish brown

Grayish black

Black

One mechanism of temperature regulation was developed by land plans and animals by developing.

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Brak and skin

Vascular tissues and circulatory system

Cambium and excretory system

Vascular tissue and respiratory system

Dominant species of mammals in grassland are the:

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Omnivores

Herbivores

Carnivores

Insectivores

Which of the following is not a biotic component

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Producers

Consumers

Decomposers

Water

Lamarck published his theory of evolution in

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1822

1812

1817

1809

A dominant plant of temperate deciduous forests is the :

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Euphorbia

Taxus baccata

cactus

Acacia

The processes that have transformed life on earth from its earliest forms to the vast diversity that we observe today, are collectively referred as

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Evolution

Succession

Revolution

All of above

Tiny shaped structure located deep between cerebral hemispheres

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Thyroid gland

Pitutary gland

Pineal Gland

Corpus callosum

A relationship that harms one of the partners is called

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Parasitism

Symbiosis

Commensalism

None

Population of Pakistan was ________ in 1947

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23.5 million

30 million

32.5 million

40 million

The type of association between two organisms, which brings benefit to both the organisms is called

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Commensalism

Predation

Mutualism

Parasitism

Pick the odd one

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Cellulose

Galactose

Agar

Pectin

On an average, there are 50 or more thylakoids piled to form one

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Intergranum

Crista

Granum

F_{_1}particle

Which of the following is a living character of virus

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Formation of Crystals

Production of new viral particles

Coordination

Metabolism

Major cells infected by HIV are

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Monocytes

B lymphocytes

T lymphocytes

RBC

Man is

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Primary consumers

Secondary consumers

Tertiary consumers

All of above

Lipids store double amount of energy as compared to same amount of carbohydrates, because of

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Higher proportion of C-H bonds

Higher proportion of C-N bonds

Higher proportion of C-O bonds

Lower proportion of C-O-P bonds

Consumers

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Are primarily animals that obtain energy directly or indirectly from producers

Are primarily bacterial organisms that obtain energy directly or indirectly from producers

Are secondary animals that obtain energy directly or indirectly from producers

Are secondary plants that obtain energy directly or indirectly from producers

Melanin pigment is produced under the hormone

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ADH

MSH

STH

TSH

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 organisms of same species live in a same place is called

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Community

Population

Consumers

All of these

All chromosomes other than sex chromosomes are called :

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Linked chromosomes

Atusomes

Autophagosommes

Dictyosomes

When a single gene has multiple phenotypic effects, the phenomenon is called:

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condominance

epistasis

pleiotropy

sex-linkage

The succession started on deserts is termed as

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Hydrosere

Xerosere

Derosere

None of the above

High calcium concentration in blood causes the stimulation of

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Parathormone

Calcitonin

T₃

T₄