What is Living Questions and Answers

What is Living MCQ (Multiple Choice Questions and Answers)

Question 1 : Maintenance of favourable internal environment of living beings is called

A) Homeostasis

B) Metabolism

C) Adaptation

D) Irritability

Answer : A

Question 2 : Changes in structure and function of living beings with age are

A) Adaptations

B) Order

C) Metabolism

D) Development

Answer : D

Question 3 : A fundamental requirement of every living organism is

A) Evolution

B) Order

C) Energy

D) Growth

Answer : C

Question 4 : Growth, development and functioning of living body is due to

A) Order

B) Homeostasis

C) Metabolism

D) Adaptations

Answer : C

Question 5 : Which type of organisation is found in only living beings

A) Atomic

B) Molecular

C) Mixture

D) Subcellular

Answer : D

Question 6 : In living beings atoms are arranged to from

A) Molecules

B) Compounds

C) Biomolecules

D) Mixture

Answer : C

Question 7 : Living and nonliving resemble each other in their organisation upto

A) Atomic level

B) Molecular level

C) Crystal level

D) Mixture level

Answer : B

Question 8 : Amoeba and Euglena have an organisation upto

A) Cellular level

B) Tissue level

C) Organ level

D) Organ system level

Answer : A

Question 9 : Organisation formed by individuals of a species is

A) Population

B) Community

C) Ecosystem

D) All the above

Answer : A

Question 10 : Supra-organismic organisation occurs in

A) Nonliving world

B) Both nonlivign and living worlds

C) Universe

D) Biosphere and its components

Answer : D

Question 11 : Organisation formed by populations of different species is

A) Ecosystem

B) Community

C) Biome

D) Biosphere

Answer : B

Question 12 : The arrangement and coordination of smaller components into larger ones is

A) Aggregation

B) Interaction

C) Organisation

D) Co-ordination

Answer : C

Question 13 : The lowest level of organisation found in living beings is

A) Population

B) Individual

C) Atomic

D) Molecular

Answer : C

Question 14 : Organisation levels in living beings are

A) Subcellular -> Cellular -> Individual -> Community -> Population

B) Atomic -> Molecular -> Subcellular -> Cellular -> Tissue -> Organ -> Individual

C) Individual -> Population -> Organ system -> Tissue -> Cellular ->Molecular -> Atomic

D) Atomic -> Molecular -> Tissue -> Individual -> Ecosystem -> Community

Answer : B

Question 15 : Organisation above the level of organism is

A) Conceptual

B) Physical

C) Biochemical

D) Ecological

Answer : D

Question 16 : Biosphere is  made up of a number of

A) Landscapes

B) Species

C) Communities

D) Populations

Answer : A

Question 17 : Communities and their non-living environments constitute

A) Biomes

B) Physico-chemical organisation

C) Ecosystems

D) Biochemical ecology

Answer : C

Question 18 : Organismic biology is related to the study of

A) Tissues

B) Organs

C) Organ system

D) All the above

Answer : D

Question 19 : Living and nonliving objects of nature

A) Have similar materials

B) Obey same physico-chemical laws

C) Both A and B

D) Have same materials but obey different physico-chemical and biochemical laws.

Answer : C

Question 20 : Number of elements essential for life is

A) 95

B) 45

C) 25

D) 14

Answer : C

Question 21 : The most abundant 6 elements found in living beings are

A) C, H, N, O, P and S

B) C, H, N, O, Ca and Na

C) C, H, O, K, Na and Mg

D) C, Ca, O, H, Mg and Mn

Answer : A

Question 22 : The six major elements constitute body mass

A) 85%

B) 92%

C) 98%

D) 99.4%

Answer : C

Question 23 : Trace element iodine has

A) Little value as nutrient

B) Moderate value as nutrient

C) Easily replaceable with fluorine

D) Immense value as nutrient

Answer : D

Question 24 : Iodine is a component of

A) Nitrate reductase

B) Hormone throxine

C) Hormone TSH

D) Nitrogenase

Answer : B

Question 25 : Sharing of valence electrons produces a chemical bond called

A) Covalent bond

B) Hydrogen bond

C) Ionic bond

D) All the above

Answer : A

Question 26 : In water, two atoms of hydrogen are linked to one atom of oxygen by 

A) Double bond

B) Multiple covalent bond

C) Triple bond

D) Hydrogen bond

Answer : B

Question 27 : Polar covalent bonds occur in

A) Oxygen

B) Hydrogen

C) Nitrogen

D) Water

Answer : D

Question 28 : In water the shared electrons are displaced towards

A) One hydrogen atom

B) Both the hydrogen atoms alternately

C) Hydrogen and oxygen atoms alternately

D) Towards oxygen atom only

Answer : D

Question 29 : In water σ charge is present over

A) Oxygen atom

B) One hydrogen atom

C) Both the hydrogen atoms

D) Both hydrogen and oxygen atoms

Answer : A

Question 30 : As compared to covalent bond, the strength of hydrogen bond is

A) 1%

B) 10%

C) 20%

D) 50%

Answer : B

Question 31 : Hydrogen bond is established between

A) Nonpolar interaction between 2 electroneutral atoms of different molecules

B) Nonpolar interaction between two electoneutral atoms of the same molecule

C) Partially electropositive hydrogen atom of one molecule and partial electronegative atom of another molecule

D) Partially electronegative hydrogen atom and partially electropositive atom of same or different molecule

Answer : C

Question 32 : Strength of a cellulose microfibril is due to

A) Strong numerous covalent bonds amongst different molecules

B) Numerous weak hydrogen bonds amongst adjacent cellulose molecules

C) Numerous strong ionic bonds amongst cellulose molecules

D) All the above

Answer : B

Question 33 : Chemical signals to brain by receptor molecules establish

A) Weak bonds

B) Strong bonds

C) Permanent bonds

D) Both B and C

Answer : A

Question 34 : Receptor molecules transmitting signals to brain separate

A) After initiation of response

B) Before initiation of response

C) Before completion of response

D) After completion of response

Answer : B

Question 35 : Hydrogen bonds amongst water molecules have bestowed the property of 

A) Liquid with ability to flow

B) High viscosity, high specific heat and high heat of vaporisation

C) High boiling point and low freezing point

D) All the above

Answer : D

Question 36 : The ionic compound with salt crystals is

A) Glucose

B) Sucrose

C) Sodium chloride

D) Water

Answer : C

Question 37 : Salt concentration of blood is

A) 0.9 gm/100 ml

B) 100 mg/100 ml

C) 9 gm/100 ml

D) 500 mg/100 ml

Answer : A

Question 38 : Saline drip is given to patients suffering from

A) Dehydration

B) Low blood pressure

C) Weakness

D) Both A and B

Answer : D

Question 39 : Which is responsible for impulse conduction in a nerve fibre

A) Cl’ ions

B) Na+ ions

C) Glucose


Answer : B

Question 40 : Chloride ion is required for

A) Nerve coordination

B) Photolysis of water

C) Active transport through cell membrane

D) All the above

Answer : B

Question 41 : Counter-current system of kidney is maintained by

A) Chloride

B) Glucose

C) Sodium

D) Sucrose

Answer : C

Question 42 : Water remains liquid between

A) 40C to 900C

B) -40C to 1000C

C) -100C to 1100C

D) 600C to 1600C

Answer : A

Question 43 : Life originated in

A) Lithosphere

B) Hydrosphere

C) Atmosphere

D) All the above

Answer : C

Question 44 : Percentage of water in the body of a living being like human is

A) 10-20%

B) 50%

C) 70-80%

D) 90-95%

Answer : C

Question 45 : In contact with water, phospholipids form

A) Rounded aggregates

B) Monolayer

C) Bilayer

D) All the above

Answer : C

Question 46 : Water has 

A) High surface tension and low thermal conductivity

B) Low surface tension and low thermal conductivity

C) High surface tension and high thermal conductivity

D) High surface tension and low thermal conductivity

Answer : C

Question 47 : In living systems water is involved as a chemical in

A) Photosynthesis and respiration

B) Synthesis of polymers

C) Hydrolysis of biochemicals

D) All the above

Answer : D

Question 48 : Water is reagent in

A) Respiration

B) Photosynthesis

C) Nerve conduction

D) Glycogenesis

Answer : B

Question 49 : Water is end product in

A) Glycogenolysis

B) Hydrostatic skeleton

C) Respiration

D) Carbon assimilation

Answer : C

Question 50 : Proteins and DNA attain their 3-dimensional reactive configuration in contact with

A) Lipids

B) Sugars

C) Zymogens

D) Water

Answer : D