MCQOPTIONS
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MCQOPTIONS
This section includes 1275 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
Important factors which affect the capacity of haemoglobin to combine with oxygen is |
| A. | Temperature |
| B. | Carbon dioxide |
| C. | pH |
| D. | All of these |
| Answer» E. | |
| 902. |
There are _________ stomata per square cm of leaf surface in Tobacco plants? |
| A. | 1200 |
| B. | 12000 |
| C. | 100,000 |
| D. | 1000 |
| Answer» D. 1000 | |
| 903. |
Functional units of lungs are called________? |
| A. | Alveoli |
| B. | Air sacs |
| C. | Parabronchi |
| D. | None of these |
| Answer» C. Parabronchi | |
| 904. |
Lungs are covered with double layered thin membranous sac called___________? |
| A. | Disphragm |
| B. | Pleura |
| C. | Pericardium |
| D. | Rib cage |
| Answer» C. Pericardium | |
| 905. |
Lungs are spongy due to the presence of million of___________? |
| A. | Air sacs |
| B. | Alveoli |
| C. | Bronchioles |
| D. | Parabronchi |
| Answer» C. Bronchioles | |
| 906. |
Deficiency of ___________ causes yellowing in plants? |
| A. | Magnesium |
| B. | Iron |
| C. | Chlorine |
| D. | Oxygen |
| Answer» B. Iron | |
| 907. |
___________ 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 |
| Answer» C. Both of these | |
| 908. |
Chlorophylls mainly absorb _________ wavelengths? |
| A. | Orange – blue |
| B. | Violet – red |
| C. | Yellow – orange |
| D. | Orange – red |
| Answer» E. | |
| 909. |
Any change in the environment of an organism is called___________? |
| A. | Stimulus |
| B. | Variation |
| C. | Response |
| D. | Reaction |
| Answer» B. Variation | |
| 910. |
First Actions spectrum was obtained by using__________? |
| A. | Algae |
| B. | Fungi |
| C. | Bacteria |
| D. | Spirogyra |
| Answer» E. | |
| 911. |
In alcoholic fermentation Pyruvic acid is broken down into? |
| A. | Acetaldehyde |
| B. | Methyl alcohol |
| C. | Ethyl alcohol |
| D. | Lactic acid |
| Answer» D. Lactic acid | |
| 912. |
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 |
| Answer» C. Parallel point | |
| 913. |
Of the following, which one causes higher production of food in green plants? |
| A. | Blue |
| B. | Orange |
| C. | Red |
| D. | Violet |
| Answer» D. Violet | |
| 914. |
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 |
| Answer» E. | |
| 915. |
Chlorophyll is insoluble in_____________? |
| A. | Carbon tetrachloride |
| B. | Alcohol |
| C. | Organic solvents |
| D. | Water |
| Answer» E. | |
| 916. |
Net yield of H2O in Photosynthesis is__________? |
| A. | 1 molecule |
| B. | 6 molecules |
| C. | 3 molecules |
| D. | 0 molecule |
| Answer» E. | |
| 917. |
Air contains __________ % of CO2 ? |
| A. | 0.02-0.03 |
| B. | 0.03-0.04 |
| C. | 0.04-0.05 |
| D. | 0.05-0.06 |
| Answer» C. 0.04-0.05 | |
| 918. |
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 |
| Answer» B. Algae | |
| 919. |
PS I has chlorophyll a molecule which absorbs maximum light of _________ nm ? |
| A. | 600 |
| B. | 650 |
| C. | 680 |
| D. | 700 |
| Answer» E. | |
| 920. |
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 |
| Answer» D. Mid night | |
| 921. |
C6H12O6 + 6O2 ? 6CO2 + 6H20 + ENERGY represents:____________? |
| A. | Photosynthesis |
| B. | Aerobic respiration |
| C. | Anaerobic respiration |
| D. | Respiration |
| Answer» C. Anaerobic respiration | |
| 922. |
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 |
| Answer» C. C55 H71 O6 N4 Mg | |
| 923. |
Bacteriochlorophylls does not include________________? |
| A. | Chlorophyll e |
| B. | Chlorophyll d |
| C. | Chlorophyll a |
| D. | Chlorophyll c |
| Answer» D. Chlorophyll c | |
| 924. |
Which of the following neuron has a single long dendron? |
| A. | Sensory neuron |
| B. | Motor neuron |
| C. | Associative neuron |
| D. | none of these |
| Answer» B. Motor neuron | |
| 925. |
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 |
| Answer» B. Axon | |
| 926. |
Microscopic gaps between the neuron endings are called__________? |
| A. | Transmitters |
| B. | Synapses |
| C. | Pores |
| D. | Nodes |
| Answer» C. Pores | |
| 927. |
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 |
| Answer» C. To stop the nerve impulse | |
| 928. |
Which of the following ions are involved in the initiation of nerve impulse_______________? |
| A. | Na+ |
| B. | K+ |
| C. | Fe |
| D. | none of these |
| Answer» B. K+ | |
| 929. |
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 |
| Answer» B. Inner surface of neuron is more positive | |
| 930. |
Which of the following are responsible for the detection of changes in environment? |
| A. | Receptors |
| B. | Neurons |
| C. | Effectors |
| D. | All of these |
| Answer» B. Neurons | |
| 931. |
Maximum speed of nerve impulse transmission is____________? |
| A. | 100 m/sec |
| B. | 110 m/sec |
| C. | 120m/sec |
| D. | 130 m/sec. |
| Answer» D. 130 m/sec. | |
| 932. |
Oil body is found in the cells of___________? |
| A. | Diatoms |
| B. | Slime moulds |
| C. | Chlorophycean forms |
| D. | None of the these |
| Answer» B. Slime moulds | |
| 933. |
Which one of the following is representing the group of diatoms? |
| A. | Pinnularia, Navicula, Cymbella, Melosira |
| B. | Euglenamorpha, Hedneria , Heteronema, Colacium |
| C. | Nostoc, Anabaena, Aulosira, Cylindrospermum |
| D. | Cochlodinium, Gymnodinium, Lenodinium, Peridinium |
| Answer» B. Euglenamorpha, Hedneria , Heteronema, Colacium | |
| 934. |
____________ was first to propose an objective definition of instinct. |
| A. | Thorpe |
| B. | Darwin |
| C. | Pavlov |
| D. | Kohler |
| Answer» C. Pavlov | |
| 935. |
Co-ordination results in_____________? |
| A. | Regulation of body functions |
| B. | Organization of body functions |
| C. | Integration of body functions |
| D. | All of these |
| Answer» E. | |
| 936. |
At the induction of action potential opening of Na+ gate with influx of Na+ is a ___________ processes? |
| A. | Active transport |
| B. | Passive transport |
| C. | Diffusion |
| D. | none of these |
| Answer» C. Diffusion | |
| 937. |
Which of the followings are effectors______________? |
| A. | Muscles |
| B. | Glands |
| C. | Sensory organs |
| D. | Both ‘a’ & ‘b’ |
| Answer» E. | |
| 938. |
Hydra has___________? |
| A. | Brain |
| B. | Nerves |
| C. | Neuron-cells |
| D. | All of these |
| Answer» D. All of these | |
| 939. |
All insects have how many parts of legs? |
| A. | 4 |
| B. | 2 |
| C. | 3 |
| D. | 6 |
| Answer» D. 6 | |
| 940. |
Normal resting membrane potential of a neuron is_____________? |
| A. | – 50 mv |
| B. | – 60 mv |
| C. | – 70 mv |
| D. | – 80 mv |
| Answer» D. – 80 mv | |
| 941. |
Types of behaviour enabling pillbugs to reach moist area is___________? |
| A. | Kinesis |
| B. | Taxes |
| C. | Instinct |
| D. | Learning |
| Answer» B. Taxes | |
| 942. |
Which of the following is antagonist to Auxin in terms of promotion of stem growth______________? |
| A. | Gibberellins |
| B. | Cytokinins |
| C. | Abscisic Acid |
| D. | none of these |
| Answer» D. none of these | |
| 943. |
Nissl’s granules are present in which part of the neuron_________________? |
| A. | Axoplasm |
| B. | Myelin sheath |
| C. | Dendrite |
| D. | Soma |
| Answer» E. | |
| 944. |
All of the following are similarities between nervous and endocrine system except:_____________? |
| A. | Produce chemical messengers |
| B. | Release chemical messengers in extracellular space |
| C. | Homestatic in function |
| D. | Having slow but prolonged effects |
| Answer» E. | |
| 945. |
Which of the following statement about neuron is incorrect___________________? |
| A. | They not only conduct impulses but also generate them |
| B. | They are not the only cellular component of nervous system |
| C. | They may show limited regenerative capabilities |
| D. | Like all the living cell, when they mature and divide to form similar cells |
| Answer» E. | |
| 946. |
Gibberellins may be substituted for ___________ light, therefore promote flowering in long day plants? |
| A. | White |
| B. | Red |
| C. | Blue |
| D. | Green |
| Answer» C. Blue | |
| 947. |
Which of the following statement about dicots is incorrect _________________? |
| A. | They have 4 or 5 sepals and petals or their multiple |
| B. | They have parallel vein pattern on their leaves |
| C. | They are both herbaceous and woody |
| D. | Vascular bundles are ring shaped in their stems |
| Answer» C. They are both herbaceous and woody | |
| 948. |
Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering______________? |
| A. | Gibberellins |
| B. | Cytokinins |
| C. | Auxins |
| D. | Ethene |
| Answer» B. Cytokinins | |
| 949. |
Which of the following is used in brewing industry to promote malting_______________? |
| A. | Gibberellins |
| B. | Cytokinins |
| C. | Auxins |
| D. | Abscisic Acid |
| Answer» B. Cytokinins | |
| 950. |
The only promoter of leaf senescence in the following plant hormones is________________? |
| A. | Gibberellins |
| B. | Cytokinins |
| C. | Auxins |
| D. | Abscisic Acid |
| Answer» E. | |