Biology MCQs PPSC and All Other Exams

biology mcqs ppsc
biology mcqs ppsc

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Biology MCQs PPSC and All Other Exams

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Biology MCQs PPSC and All Other Exams

801. Which of the following has no central nervous system?

A. Hydra
B. Man
C. Planaria
D. Cockroach

802. Maximum speed of nerve impulse transmission is____________?

A. 100 m/sec
B. 110 m/sec
C. 120m/sec
D. 130 m/sec.

803. Which of the following are responsible for the detection of changes in environment?

A. Receptors
B. Neurons
C. Effectors
D. All of these

804. Any change in the environment of an organism is called___________?

A. Stimulus
B. Variation
C. Response
D. Reaction

805. Co-ordination results in_____________?

A. Regulation of body functions
B. Organization of body functions
C. Integration of body functions
D. All of these

806. Which of the followings are effectors______________?

A. Muscles
B. Glands
C. Sensory organs
D. Both ‘a’ & ‘b’

807. Hydra has___________?

A. Brain
B. Nerves
C. Neuron-cells
D. All of these

808. Co-ordination in man is brought about by___________?

A. Nervous system
B. Endocrine system
C. Both of these
D. none of these.

809. Which of the followings is missing from the nervous system of planaria_____________?

A. Ganglia
B. Longitudinal nerves
C. Lateral nerves
D. none of these

810. Which of the following transmits nerve impulse from receptors to central nervous system?

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

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

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

812. Which of the following neuron has a single long dendron?

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

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

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

814. Microscopic gaps between the neuron endings are called__________?

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

815. What is the function of synapse________________?

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

816. Under resting membrane potentials:

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

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

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

818. Central nervous system of man consists of______________?

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

819. Reflex actions below the neck are under control of____________?

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

820. Which of the following is present inside the vertebral column______________?

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

821. Which of the following is largest part of brain?

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

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

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

823. Intelligence is under the control of____________?

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

824. Which of the following acts as thermoregulator?

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

825. Which of the following allows precise muscular movements_______________?

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

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

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

827. Value of resting membrane potential is_____________?

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

828. Receptors for hearing come under heading of___________?

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

829. Which of the following feature is not related to neuron?

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

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

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

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

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

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

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

833. Bacteriochlorophylls does not include________________?

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

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

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

835. Molecular formula of chlorophyll b is_____________?

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

836. Which of the following is a compensation point:

A. Leaves respire and utilize O2 and release CO2.
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. Rate of respiration becomes more than rate of photosynthesis.

837. Quantitative study of energy relationships in biological systems obeys.

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

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

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

839. Carotenoids perform protective function in_____________?

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

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

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

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

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

842. Net yield of H2O in Photosynthesis is__________?

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

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

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

844. Air contains __________ % of CO2 ?

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

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

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

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

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

847. Visible light used in photosynthesis ranges from:__________?

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

848. The percentage of light absorbed by the leaf is ___________?

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

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

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

850. The first action spectrum was obtained by___________?

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

851. Which of the light is mainly absorbed by the plants?

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

852. First Actions spectrum was obtained by using__________?

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

853. Chlorophyll is insoluble in_____________?

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

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

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

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

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

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

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

857. Molecular formula of chlorophyll ‘a’ molecule is___________?

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

858. Stomata cover only ______________ of leaf surface?

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

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

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

860. Reduction in photosynthesis is of____________?

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

861. Light reaction takes place on/in____________?

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

862. NADPH2 provides___________?

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

863. Thylakoids in chloroplasts are stacked into___________?

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

864. Of the following, which one light – gathering?

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

865. In all plants the major sites of phosynthesis are___________?

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

866. Photosystem II has molecules which absorbs maximum light of___________?

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

867. The dense fluid filled region in the chloroplast is____________?

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

868. Chlorophylls are found embedded in the __________ membranes?

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

869. Glycolysis takes place in____________?

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

870. Xanthophylls are _________ pigments

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

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

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

872. Chlorophylls mainly absorb _________ wavelengths?

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

873. Deficiency of ___________ causes yellowing in plants?

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

874. In alcoholic fermentation Pyruvic acid is broken down into?

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

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

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

876. The most important photosynthetic pigment is ___________?

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

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

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

878. Final acceptor of electrons in respiratory chain is____________?

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

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

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

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

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

881. Cellular respiration is essentially a/an _____________ process?

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

882. ATP are consumed during___________?

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

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

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

884. Functional units of lungs are called________?

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

885. Lungs are spongy due to the presence of million of___________?

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

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

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

887. Lungs are covered with double layered thin membranous sac called___________?

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

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

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

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

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

890. Of the following, which one is better respiratory medium___________?

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

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

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

892. Oxygen contents per liter of air is____________?

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

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

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

894. Water is _________ times viscous than air?

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

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

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

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

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

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

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

898. The glycolate produced diffuses into the membrane bounded organelles called____________?

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

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

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

900. Percentage of CO2 carried as carboxyhaemoglobin is_________?

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

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