Question # 1

In each case succession begins with few hard invaders called:

Choose an answer

Producers

Consumers

Pioneers

Beginners

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

Choose an answer

Primary

Secondary

Tertiary

Quaternary

Regulation of hunger and menstrual cycle is controlled by

Choose an answer

Cerebrum

Thalamus

Hypothalamus

Pons

Some ______ years ago human population and conversion of land to agricultural production began

Choose an answer

10,000

40,000

5000

None

Which of the following is not an enzyme of HIV

Choose an answer

Reverse transcriptase

Integerase

Protease

Ligase

High calcium concentration in blood causes the stimulation of

Choose an answer

Parathormone

Calcitonin

T₃

T₄

Point mutation occurs in

Choose an answer

Sickle cell anemia

Phenylketonuria

Alkaptonuria

All

Which is responsible for hyperpolarization across membrane

Choose an answer

Disturbing of charge

Late closing of K+ gates

Influx of Na+

Efflux of Na+

Topography is study of?

Choose an answer

Population

Individula

Earth

birds

Which is not the function of glucagon

Choose an answer

Glycogen hydrolysis

Lipolysis

Gluconeogenesis

Protein synthesis

Which of the following properties is incorrect for both mitochondria and chloroplast?

Choose an answer

Both have an electron transport system

ATP synthesis

Both are present in all cells

Both have double membrane structures

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

Choose an answer

1

2

3

4

The combination of many food chains is termed as

Choose an answer

Food chain

Food web

Trophic level

None of above

Genetic basis of ABO blood group system was explained by:

Choose an answer

Landsteiner

Levine

Bernstein

Carl Correns

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

Choose an answer

Somatic cells, Germ cells

Osteocytes, Somatic cells

Germ cells, Somatic cells

Somatic cells, Gametocytes

Gene pool consists of all alleles at all gene loci in all individuals of the:

Choose an answer

community

species

population

family

HIV attaches on cell membrane of T cell at _____ receptor site

Choose an answer

Cd2

Cd4

Cd8

Gp120

Viruses reproduce through a process

Choose an answer

Binary fission

Replication

Both a and b

Transformation

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

Choose an answer

Food

Protection

Conditions for its survival

All a, b, c

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

Choose an answer

Crossing over

Hopping

Taking over

Segregation

Which disease is due to nutritional deficiency

Choose an answer

Scurvy

Diabetes

Herpes

Diphtheria

Most of the plant cells lack following organelles EXCEPT

Choose an answer

Flagellum

Lysosome

Centriole

Mitochondria

Mutation of one or two N-bases is

Choose an answer

Inversion

Point mutation

Deletion

Chromosomal aberrations

Ecology is a ______ word.

Choose an answer

German

British

French

Greek

It is not a steroid hormone

Choose an answer

Epinephrine

Estrogen

Progesterone

17 β hydoxy Testosterone

Animals feed on green plants and grasses are called

Choose an answer

Grazers

Produces

Consumers

Predators

The lake ecosystem can be divided into ______ number of zones:

Choose an answer

Two

Three

Four

Five

Population of Pakistan was ________ in 1947

Choose an answer

23.5 million

30 million

32.5 million

40 million

______ is a change in the community structure of an ecosystem over a period of time

Choose an answer

Succession

Primary succession

Secondary succession

None of above

Climax in zerosere is the establishment fo

Choose an answer

Woody forest

Grasses

Herbs

Shrubs

Joseph Grinnell an American scientist was:

Choose an answer

Paleontologist

Embryologist

Ornithologist

All of these

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

Choose an answer

Ribosome

Cytoskeleton

Mitochondria

Golgi

What is cause of Eutrophication

Choose an answer

Excreta

Phosphate

Nitrates

All

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

Choose an answer

population

community

species

succession

Enzymes present in human body generally have

Choose an answer

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

Deficiency of sex hormones in adults results in

Choose an answer

Sexual immaturity

Mortality

UTI

sterility

Which of the following is Koshland model

Choose an answer

Active site is rigid

Active site may be molded to précised shape

Position of active site is moveable

None

Darwin published " The Origin of Species" in

Choose an answer

1840

1844

1858

1859

The desert ecosystem of western punjab is called:

Choose an answer

Thar

Thal

Alpine

Boreal

The chances of which hemophilia is equal in males & females

Choose an answer

A

B

C

All

Which of the following sugar does not form a ring structure in a solution

Choose an answer

Glyceraldehyde

Ribose

Glucose

Fructose

Phylum of asymmetrical animals is

Choose an answer

Nematoda

Platyhelminthes

Cnidaria

Porifera

Tundra ecosystem is a vast treeless region bordering the:

Choose an answer

Pacific ocean

Atlantic ocean

Arctic ocean

Arabian sea

Consumers that prey other animals are known as

Choose an answer

Predators

Preys

Parasites

Competitors

The ecosystem present on land or soil is called

Choose an answer

Terrestrial ecosystem

Lithospheric ecosystem

A and B

None

What is the risk of a colour blind child in a family when mother is colour-blind but father is normal?

Choose an answer

100%

75%

50%

25%

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

Choose an answer

Mitochondria

Vesicles

Ribosomes

Nucleus

Which of these diseases is not infectious?

Choose an answer

Measles

Influenza

Pneumonia

Tetany

Potentially damaging enzymes are produced in

Choose an answer

Active form

Inactive form

Abundant quantity

Minor quantity

After digestion, decomposers releases

Choose an answer

Various organic substances from organic matter

Nitrates, phosphates, and calcium

Citric acid, tartaric acid and oxlic acid

All of these

Melanin pigment is produced under the hormone

Choose an answer

ADH

MSH

STH

TSH

STH promotes_____ after puberty

Choose an answer

Protein synthesis

Cell differentiation

Metabolism

Cell division

Which of the following virus is DNA enveloped

Choose an answer

Polio virus

Hepatitis B virus

HIV

Measles virus

The dead plants and animal bodies in lakes are decomposed by certain:

Choose an answer

Cyanobacteria

Bacteria

Mold

Protozoans

In an ecosystem after succession, a new invaders are called

Choose an answer

Pioneers

Predecessors

Climax community

None of these

In limnetic zone the phytoplankton are:

Choose an answer

Cyanobacteria

Protozoan

Fungi

Bacteria

Newly synthesized Large proteins are digested into small viral proteins by

Choose an answer

Host protease

Viral protease

Viral RT

Host pepsin

The organelle that protect the cell from invading organisms is

Choose an answer

Centriole

Lysosome

Mitochondrion

Vacuole

Which of these stages appears as a pioneer during succession on barren land?

Choose an answer

Foliage lichens

Mosses

Crustose lichens

Fruiticose lichens

An animal that preys other animals is called:

Choose an answer

Predator

Parasite

Scavenger

Detritivore

Plants growing in extreme cold soil are called:

Choose an answer

Sciophytes

Psychrophytes

Heliophytes

Cyanophytes

Viruses containing RNA rather than DNA are called

Choose an answer

Riboviruses

Bacteriophages

Rotaviruses

Retroviruses

Omnivores are described by how many trophic levels

Choose an answer

Any 2

Any 3

Any 1

Primary & any higher

An association between certain fungi and the roots of plants growing in acid soil is:

Choose an answer

Lichens

Predation

Mycorrhiza

Commensalism

The parasite that live outside the body of the host is called as

Choose an answer

Endoparasite

Ectoparasite

Outer parasite

All of above

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

Choose an answer

500 feet

700 feet

600 Feet

1000 Feet

The simplest reflex circuit includes___ elements

Choose an answer

1

2

3

4

Which one of the following does not refer to mutialism

Choose an answer

Mycorrhiza

Parasitism

Lichen

Bacteria in the gut of cow

In temperate grassland the rate primary production is about:

Choose an answer

700 - 1400 g/m²

700 - 1600 g/m²

700 -1800 g/m²

700 - 1500 g/m²

Which can't increase their weight in inorganic medium

Choose an answer

Producer

Consumer

Decomposer

Both b & c

Substances cross the cell membrane more easily when they are

Choose an answer

water soluble

protein soluble

alcohol soluble

lipid soluble

Highest degree of regeneration is present in sponges because of

Choose an answer

Undifferentiated cells

Simplest organization

Ability to reproduce

Absence of germ layers

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

Choose an answer

Histidine

Valine

Proline

Leucine

Allele for whiteness in Drosophila is :

Choose an answer

Recessive

Codominant

Dominant

Partially Dominant

Patient of AIDS is susceptible to many infections due to

Choose an answer

Severe pneumonia

Swollen lymph nodes

Loss of immune system

All of these

Pick up ester bond present in nucleotide

Choose an answer

P-O-C

C-O-C

N-O-C

S-O-C

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

Choose an answer

Oxidation

Denitrification

Ammonification

Nitrification

The chief reservoir of nitrogen is the

Choose an answer

Atmosphere

Water

Soil

Rain

Slight change in pH can cause

Choose an answer

Denaturation

Crystallization

Ionization

All

Biotic components includes all the

Choose an answer

Nonliving components

Living components

Nonliving and living both

None of these

Bacterial and fungi are mainly included in the group of

Choose an answer

Consumers

Decomposers

Producers

None of these