Biology Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests

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Biology Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests

Biology Mcqs - (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
Biology Mcqs

Biology Mcqs “. Tab this page to check “Latest Biology MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Biology in past papers. Past papers of Biology mcqs. Past papers of Biology MCQs. Biology Mcqs are the necessary part of any competitive / job related exams. The Biology mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Biology mcqs. The Important series of Biology Mcqs are given below:

In which of the following neurons length of dendrite is greater than axon_______________?

A. Sensory neuron
B. Associative neuron
C. Motor neuron
D. none of these.

Which of the following neuron has a single long dendron?

A. Sensory neuron
B. Associative neuron
C. Motor neuron
D. none of these.

Which of the following cytoplasmic extensions carry the message toward the cell body___________?

A. Axon
B. Dendrites
C. Both of these
D. none of these

Microscopic gaps between the neuron endings are called__________?

A. Pores
B. Synapses
C. Transmitters
D. Nodes

What is the function of synapse________________?

A. To stop the nerve impulse
B. To decrease the speed of nerve impulse
C. To allow nerve impulse to move in backward direction
D. To provide cytoplasmic connection between neurons.

Under resting membrane potentials:

A. Outer surface of neuron is more positive
B. Both of these surfaces are equally positive
C. Inner surface of neuron is more positive
D. none of these.

Which of the following ions are involved in the initiation of nerve impulse_______________?

A. Na+
B. Fe
C. K+
D. none of these

Central nervous system of man consists of______________?

A. Spinal cord
B. Brain
C. Both of these
D. none of these

Reflex actions below the neck are under control of____________?

A. Hypothalamus
B. Spinal cord
C. Brain
D. none of these.

Which of the following is present inside the vertebral column______________?

A. Spinal cord
B. Brain
C. Both of these
D. none of these.

Which of the following is largest part of brain?

A. Cerebrum
B. Medulla oblongata
C. Cerebellum
D. Thalamus

Which of the following is second largest part of the brain_______________?

A. Thalamus
B. Cerebellum
C. Cerebrum
D. Hypothalamus

Intelligence is under the control of____________?

A. Cerebrum
B. Thalamus
C. Cerebellum
D. Hypothalamus

Which of the following acts as thermoregulator?

A. Cerebellum
B. Cerebrum
C. Thalamus
D. Hypothalamus

Which of the following allows precise muscular movements_______________?

A. Thalamus
B. Cerebellum
C. Cerebrum
D. Hypothalamus

It is one of the convulsive disorders of nerves which are characterized by abrupt transient symptoms of motor, sensory, psychic or autonomic nature________________?

A. Dementia
B. Epilepsy
C. Alzheimer’s discease
D. Parkinson’s disease

Value of resting membrane potential is_____________?

A. 0.05 V
B. 0.03 V
C. 0.07 V
D. 0.09V

Receptors for hearing come under heading of___________?

A. Photo
B. Mechanical
C. Chemical
D. Nociceptors

Which of the following feature is not related to neuron?

A. Reflex
B. Regeneration
C. Conduction
D. Movement

Which of the following is a chemical link between catabolism and anabolism?

A. ADP
B. AMP
C. ATP
D. All of these

Biology Mcqs

Photosynthesis is process in which ________ compounds of carbon (CO2) and hydrogen (H2O) are reduced to carbohydrate like (glucose) using light energy.

A. Energy rich
B. Organic
C. Energy poor
D. Reduced

C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents:____________?

A. Anaerobic respiration
B. Aerobic respiration
C. Photosynthesis
D. Respiration

Bacteriochlorophylls does not include________________?

A. Chlorophyll d
B. Chlorophyll e
C. Chlorophyll a
D. Chlorophyll c

At which times there is no net gaseous exchange between leaves and the atmosphere.

A. Night time.
B. Day time.
C. Dawn & Dusk.
D. Mid night.

Molecular formula of chlorophyll b is_____________?

A. C55 H71 O6 N4 Mg
B. C55 H70 O6 N5 Mg
C. C55 H10 O4 N6 Mg
D. C55 H70 O6 N4 Mg

Which of the following is a compensation point:

A. Rate of respiration becomes more than rate of photosynthesis.
B. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.
C. Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.
D. Leaves respire and utilize O2 and release CO2.

Quantitative study of energy relationships in biological systems obeys.

A. Laws of thermo chemistry
B. Laws of thermodynamics
C. Bioenergetics
D. Laws of chemical energetic

The organisms able to use sunlight directly as a source of energy are_____________?

A. Plants
B. Omnivores
C. Animals
D. Fungi

Carotenoids perform protective function in_____________?

A. Plants
B. Animals
C. Both of these
D. None of these

Of the following which one is not an energy releasing process?

A. Respiration
B. Glycolysis
C. Photosynthesis
D. Kreb’s cycle

About __________ % of photosynthesis is carried by terrestrial plants, while rest occurs in ocean, lakes, and ponds?

A. 10%
B. 30%
C. 20%
D. 40%

Net yield of H2O in Photosynthesis is__________?

A. 6 molecules
B. 1 molecule
C. 3 molecules
D. 0 molecule

The point at which there is no net exchange of gases between leaves and atmosphere is known as_____________?

A. Parallel point
B. Compensation point
C. Neutral point
D. Competitive point

Air contains __________ % of CO2 ?

A. 0.04-0.05
B. 0.03-0.04
C. 0.02-0.03
D. 0.05-0.06

Van neil hypothesis about the production of oxygen during phosynthesis was based on the study and investigations on___________?

A. Bacteria
B. Protenema
C. Algae
D. Cyanobacteria

PS I has chlorophyll a molecule which absorbs maximum light of _________ nm ?

A. 650
B. 600
C. 680
D. 700

Visible light used in photosynthesis ranges from:__________?

A. 350 – 750 nm in wavelength
B. 300 – 700 nm in wavelength
C. 380 – 750 nm in wavelength
D. 390 – 790 nm in wavelength.

The percentage of light absorbed by the leaf is ___________?

A. 15%
B. 20%
C. 10%
D. 1%

Which of the following light is least absorbed by the plants?

A. Red
B. Orange
C. Blue
D. Green

The first action spectrum was obtained by___________?

A. T.W.Englemam
B. T.W.Inws
C. Malleus
D. W.Stapes

Which of the light is mainly absorbed by the plants?

A. Red
B. Orange
C. Green
D. Both A and B

First Actions spectrum was obtained by using__________?

A. Fungi
B. Algae
C. Bacteria
D. Spirogyra

Chlorophyll is insoluble in_____________?

A. Alcohol
B. Carbon tetrachloride
C. Organic solvents
D. Water

Of the following, which one causes higher production of food in green plants?

A. Orange
B. Blue
C. Red
D. Violet

Which of the following statement about the head of a chlorophyll molecule is incorrect?

A. It is flat, square and light absorbing
B. It is a porphyrin ring or tetrapyrrole ring structure
C. Composed of carbon and nitrogen atoms with Magnesium as central metal ion, which is coordinated with nitrogen.
D. It is hydrophobic

Photosynthesis carried out by terrestrial plants is _________ of total photosynthesis?

A. 5%
B. 1-2%
C. 10%
D. 20%

Molecular formula of chlorophyll ‘a’ molecule is___________?

A. C55H72O5N4Mg
B. C50H72O6N4Mg
C. C55H70O6N4Mg
D. C55H70O5N4Mg

Biology Mcqs

Stomata cover only ______________ of leaf surface?

A. 10%
B. 0.03 – 0.04%
C. 1-2 %
D. 50%

Which of the following pigment is Blue- green in colour?

A. Chlorophyll a
B. Chlorophyll c.
C. Chlorophyll b.
D. Chlorophyll d.

Reduction in photosynthesis is of____________?

A. H2O
B. CO2
C. O2
D. light energy

Light reaction takes place on/in____________?

A. Storma
B. Thylakoid
C. Chloroplast
D. Grana

NADPH2 provides___________?

A. chemical energy
B. assimilatory power
C. energized electrons
D. All of these

Thylakoids in chloroplasts are stacked into___________?

A. Grana
B. Nucleus
C. Stroma
D. None of these

Of the following, which one light – gathering?

A. Antenna complex
B. Photosystem
C. Reaction centre
D. None of these

In all plants the major sites of phosynthesis are___________?

A. Leaves respire and utilize O2 and release CO2.
B. Roots
C. Stems
D. Branches

Photosystem II has molecules which absorbs maximum light of___________?

A. 680 nm
B. 700 nm
C. 100 m
D. 670 nm

The dense fluid filled region in the chloroplast is____________?

A. Thylakoid
B. Stroma
C. Grana
D. None of these

Chlorophylls are found embedded in the __________ membranes?

A. Grana
B. Stroma
C. Thylakoid
D. Intergrana

Glycolysis takes place in____________?

A. Cytosol
B. Nucleus
C. Mitochondria.
D. Ribosomes

Xanthophylls are _________ pigments

A. Yellow
B. Orange
C. Red
D. Green

Complete breakdown of glucose molecule takes place in which of the following?

A. Lactic acid fermentation
B. Alcoholic fermentation
C. Aerobic respiration
D. All of these

Chlorophylls mainly absorb _________ wavelengths?

A. Violet – red
B. Orange – blue
C. Yellow – orange
D. Orange – red.

Deficiency of ___________ causes yellowing in plants?

A. Magnesium
B. Chlorine
C. Iron
D. Oxygen

In alcoholic fermentation Pyruvic acid is broken down into?

A. Methyl alcohol
B. Acetaldehyde
C. Ethyl alcohol
D. Lactic acid

The chlorophyll molecule is embedded in the core of thylakoid membrane which acts as___________?

A. Hydrophobic
B. Hydrophilic
C. Both of these
D. None of these

The most important photosynthetic pigment is ___________?

A. Chlorophyll a
B. Xanthophyll
C. Chlorophyll b
D. Carotenes

In which of the following component of the body, lactic acid fermentation takes place?

A. Heart
B. Brain
C. Liver
D. Muscles

Final acceptor of electrons in respiratory chain is____________?

A. Water
B. Cytochrome a3
C. NADH
D. Oxygen

In Anaerobic respiration only __________ % of the energy present within the chemical bond of glucose is converted into ATP?

A. 3%
B. 2%
C. 1%
D. 4%

From one pyruvate passing through Kreb’s cycle, how many NADH are formed?

A. 1
B. 2
C. 3
D. 4

Cellular respiration is essentially a/an _____________ process?

A. Oxidation.
B. Redox.
C. Reduction.
D. None of the above.

ATP are consumed during___________?

A. Glycolysis
B. Light dependent phase
C. Kreb’s cycle
D. none of these

Breaking of terminal phosphate of ATP releases about ___________ Kcal of energy?

A. 6.3
B. 6.1
C. 7.1
D. 7.3

Functional units of lungs are called________?

A. Parabronchi
B. Air sacs
C. Alveoli
D. None of these

Lungs are spongy due to the presence of million of___________?

A. Bronchioles
B. Alveoli
C. Air sacs
D. Parabronchi

___________ respiration is directly involved in the production of energy, necessary for all living activities?

A. Cellular
B. Organismic
C. Both of these
D. None of these

Lungs are covered with double layered thin membranous sac called___________?

A. Pericardium
B. Pleura
C. Disphragm
D. Rib cage

___________ respiration is the process by which cell utilized oxygen and produces CO2 ?

A. Organismic
B. Cellular
C. Both of these
D. None of these

During rest the breathing occurs rhythmically at the frequency of _________ times per minute in human?

A. 5?10
B. 15-20
C. 16-30
D. 6?12

Of the following, which one is better respiratory medium___________?

A. Air
B. Soil
C. Water
D. None of these

The maximum amount of oxygen which normal human blood absorbs and carries at sea level is ________ per 100 ml of blood.

A. 30 ml
B. 20 ml
C. 10 ml
D. 40 ml

Oxygen contents per liter of air is____________?

A. 100 ml
B. 10 ml
C. 200 ml
D. 100ml

Haemoglobin can be almost completely oxygenated by an oxygen pressure of __________ of mercury.

A. 60 mm
B. 10 mm
C. 10 cm
D. 100 mm

Biology Mcqs

Water is _________ times viscous than air?

A. 50
B. 5000
C. 1000
D. 8000

Important factors which affect the capacity of haemoglobin to combine with oxygen is:

A. Carbon dioxide
B. Temperature
C. pH
D. All of these

There are _________ stomata per square cm of leaf surface in Tobacco plants?

A. 12000
B. 1200
C. 100,000
D. 1000

The air spaces may comprise upto _________ of total volume of leaf surface?

A. 20%
B. 30%
C. 40%
D. 50%

The glycolate produced diffuses into the membrane bounded organelles called____________?

A. Lysosomes
B. Peroxisomes
C. Glyoxisomes
D. Mitochondria

The increase in pH of blood has ________ effect on the oxygen carrying capacity of haemogolobin?

A. plus ve
B. No
C. – ve
D. All of these

Percentage of CO2 carried as carboxyhaemoglobin is_________?

A. 70%
B. 5%
C. 20%
D. 10%

Arterial blood contains _________ of CO2 per 100 ml of blood

A. 60 ml
B. 54 ml
C. 64 ml
D. 50 ml

Active site of Rubisco is evolved to bind?

A. O2
B. CO2
C. H2O
D. All of these

More than ___________ compounds of tar of tobacco smoke are involved to cause cancer?

A. 90
B. 5
C. 15
D. 10

A disease of longs in which inside of the lungs is damaged resulting in cough and fever?

A. Asthma
B. Lung cancer
C. Emphysema
D. Pulmonary tuberculosis

Number of spiracles present in cockroach is___________?

A. 10
B. 15
C. 20
D. 30

Of the following, which one is a contagious disease?

A. Tuberculosis
B. Asthma
C. Lungs cancer
D. Emphysema

Number of spiracles present in the thorax of cockroach is___________?

A. 3
B. 2
C. 5
D. 4

Which of the following promotes growth in plants?

A. Calvin cycle
B. Photorespiration
C. Both of these
D. None of these

When abdomen expands, the number of spiracles open is_____________?

A. 3
B. 2
C. 6
D. 8

Which of the following animals has a respiratory system with one way flow of the air through the lungs, and the air is renewed after inspiration?

A. Earthworm
B. Cockroach
C. Aves
D. Frogs

Biology Mcqs – (Science) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests

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