300+ REAL TIME NEET Biology Objective Questions & Answers 2023

300+ TOP MCQs on Human Brain and Answers

NEET Biology is the vey important paper in the medical entrance exam. Here, you will discover the NEET Biology MCQs and Answers for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Biology objective questions on air pollution . NEET Biology Human Brain Multiple Choice Questions

MCQs on Human Brain :

1. The stimulation of a muscle fibre by a motor neuron occurs at the
(a) myofibril
(b) transverse tubules
(c) neuromuscular junction
(d) sarcoplasmic reticulum

Answer

Answer: (c)

2. An injury sustained by the hypothalamus is most likely to interrupt
(a) coordination during locomotion
(b) short term memory
(c) regulation of body temperature
(d) executive function like decision making

Answer

Answer: (c)

3. In humans, the Alzheimer disease is linked with the deficiency of
(a) acetylcholine
(b) dopamine
(c) glutamic acid
(d) Gamma Amino Butyric Acid (GABA)

Answer

Answer: (a)

4. What is the person with these symptoms suffering from? Outbursts of emotions, unpredictable moods, quarrelsome behaviour, conflicts with others
(a) Mood disorders
(b) Addictive diroders
(c) Schizoprenia
(d) Borderline personality disorder (BPD)

Answer

Answer: (d)

5. Even after the brain of a frog has been crushed, it still responds to a pinch on the leg by drawing it away. This act is an example of
(a) Conditioned reflex
(b) Simple reflex
(c) Automated motor response
(d) Neurotransmitter induced response

Answer

Answer: (b)

6. Which of these functions will be affected if the medulla oblongata is damaged?
(a) Vision
(b) Thermoregulation
(c) Memory
(d) Tactile sensation – response when prickled with a needle

Answer

Answer: (d)

7. This part of the human brain is also known as the emotional brain
(a) Epithalamus
(b) Limbic system
(c) Broca’s area
(d) Corpus callosum

Answer

Answer: (b)

8. This is the outermost cranial appendage
(a) Dura mater
(b) Pia mater
(c) Skull
(d) Arachnoid

Answer

Answer: (a)

9. This cranial meninges is in close proximity of the brain tissue
(a) Dura mater
(b) Pia mater
(c) Arachnoid
(d) Skull tissue

Answer

Answer: (b)

10. This statement is not associated with midbrain
(a) the ventral portion of the midbrain is composed of mainly four, round swellings known as corpora quadrigemina
(b) located between thalamus of the forebrain and pons of the hindbrain
(c) the canal called cerebral aqueduct passes through the midbrain
(d) hindbrain and midbrain constitute the brain stem

Answer

Answer: (a)

300+ TOP MCQs on Electrocardiography and Answers

MCQs on Electrocardiography :

1. ECG (Electrocardiogram) was developed first by
(a) Wilhelm His
(b) Steward
(c) Hubert Mann
(d) Willem Einthoven

Answer

Answer: (d)

2. This is the classic ECG change in MI (myocardial infarction)
(a) ST-segment elevation
(b) T-wave inversion
(c) Development of an abnormal Q wave
(d) All of these

Answer

Answer: (d)

3. In which of these conditions can widen QRS and Tall-tented T waves be observed?
(a) Hyponatremia
(b) Hyperkalemia
(c) Hyperglycemia
(d) Hyperphosphatemia

Answer

Answer: (b)

4. A particular ECG change observed in Hypokalemia is
(a) ST segment elevation
(b) U wave (a position deflection after the T wave)
(c) Tall peaked T waves
(d) Widening of the QRS complex and increased amplitude

Answer

Answer: (b)

5. ECG report must consist of the following information
(a) Rhythm, cardiac axis
(b) Conduction intervals
(c) Description of the ST segments, QRS complexes, T-waves
(d) All of these

Answer

Answer: (d)

6. For the normal heartbeat, depolarization stimulus originates in
(a) His-bundle areas
(b) Epicardium
(c) Sinoatrial (SA)node
(d) Atrioventricular (AV) node

Answer

Answer: (c)

7. The characteristics – slurring of the initial QRS deflection, shortened PR interval, and prolonged QRS duration are of this condition
(a) Atrial tachycardia
(b) Left bundle branch block
(c) WPW (Wolff-Parkinson-White) syndrome
(d) Myocardial ischemia

Answer

Answer: (c)

8. P wave indicates
(a) Depolarization of right ventricle
(b) Depolarization of left ventricle
(c) Depolarization of both atria
(d) Atria to ventricular conduction time

Answer

Answer: (c)

9. Ventricular muscle depolarization is indicated by
(a) PR interval
(b) P wave
(c) U wave
(d) The QRS complex

Answer

Answer: (d)

10. ECG identified by the PR interval tends to become longer with every succeeding ECG complex until there is a P wave not followed by a QRS is observed in
(a) Third-Degree Atrioventricular Block
(b) Second-Degree Atrioventricular Block, Type II
(c) Second-Degree Atrioventricular Block, Type I
(d) First-Degree Atrioventricular Block, Type II

Answer

Answer: (c)

300+ TOP MCQs on Protista and Answers

MCQs on Protista :

1. The protistan genome has
(a) Free nucleic acid aggregates
(b) Membrane-bound nucleoproteins embedded in the cytoplasm
(c) Gene containing nucleoproteins condensed together in a loose mass
(d) nucleoprotein in direct contact with cell substance

Answer

Answer: (b)

2. The protist that reproduces both by binary fission and conjugation is
(a) Amoeba
(b) Euglena
(c) Paramecium
(d) Monocystis

Answer

Answer: (c)

3. Few protists possess structures to regulate their water content. They are
(a) membranes
(b) Chromatophores
(c) Nuclei
(d) Contractile vacuoles

Answer

Answer: (d)

4. Protists include
(a) Bacteria, fungi, algae and Bryophyta
(b) Protozoa, algae and fungi
(c) Vascular plants, slime moulds, and fungi
(d) Bacteria, algae, protozoa, and Bryophyta

Answer

Answer: (b)

5. Pick the wrong statement
(a) Diatoms are primarily produced in the oceans
(b) Diatoms are microscopic and float passively in the water
(c) Walls of diatoms are destructible easily
(d) Diatomaceous earth is formed by the cell walls of diatoms

Answer

Answer: (c)

6. Micronucleus and macronucleus are the characteristic features of
(a) Balantidium and Hydra
(b) Vorticella and Nyctotherus
(c) Opalina and Nyctotherus
(d) Vorticella and Paramecium

Answer

Answer: (d)

7. The cell walls form two thin overlapping shells in which group of organisms such that they fit together
(a) Euglenoids
(b) Dinoflagellates
(c) Slime moulds
(d) Chrysophytes

Answer

Answer: (d)

8. Whorling whips are named so because of
(a) Type of nucleus
(b) Mode of movement
(c) Mode of reproduction
(d) Mode of nutrition

Answer

Answer: (b)

9. Red tide is caused by
(a) Noctiluca
(b) Ceratium
(c) Gonyaulax
(d) All of the above

Answer

Answer: (d)

10. In Dinoflagellates, the reserve food is
(a) Fucoxanthin
(b) Starch
(c) Alginic acid
(d) Mannitol

Answer

Answer: (b)

300+ TOP MCQs on Plastids and Answers

MCQs on Plastids :

1. All three types of plastids have evolved from
(a) Leucoplast
(b) Chloroplast
(c) Pro-plastid
(d) Chromoplast

Answer

Answer: (c)

2. These lack plastids
(a) fungi and animals
(b) plants and animals
(c) bacterium, animals and fungi
(d) none of the above

Answer

Answer: (c)

3. This is a common feature of plastids and mitochondria
(a) both have dsDNA
(b) Both contains 70s ribosomes
(c) both are double membranous cell organelles
(d) all of these

Answer

Answer: (d)

4. All are colourless plastids(leucoplasts) except
(a) amyloplast
(b) elaioplast
(c) rhodoplast
(d) proteinoplast

Answer

Answer: (c)

5. Plastids are present in
(a) Euglenoides
(b) Plants
(c) Both (a) and (b)
(d) all protists

Answer

Answer: (c)

6. Cell organelles found only in plants are
(a) Ribosomes
(b) Mitochondria
(c) Golgi complex
(d) Plastids

Answer

Answer: (d)

7. Plastids are not found in which of the following
(a) Fungi
(b) Blue green algae
(c) Bacteria
(d) all of these

Answer

Answer: (d)

8. Plant cells and animal cells differ from each other in having
(a) Vacuole
(b) Centrosome
(c) Plastid
(d) Golgi body

Answer

Answer: (c)

9. The type of plastids helping in pollination is
(a) Leucoplasts
(b) Chloroplasts
(c) Chromoplasts
(d) All of the above

Answer

Answer: (c)

10. Fret channels are associated with
(a) Two lamellae of a granum
(b) Two grana of a chloroplast
(c) Two quantasomes
(d) Two plastids of a cell

Answer

Answer: (b)

300+ TOP MCQs on Internal Structure of Root Stem and Leaf and Answers

MCQs on Internal Structure of Root Stem and Leaf :

1. Collenchymatous hypodermis is characteristics of
(a) Hydrophytes
(b) Monocot and dicot stem
(c) Monocot stem
(d) Dicot stem

Answer

Answer: (d)

2. The lacunae in the vascular bundles of monocot stem is
(a) Metaxylem
(b) A mucilage canal
(c) Lysigenous water cavity
(d) A large sized protoxylem

Answer

Answer: (c)

3. The protoxylem in its midrid bundle in a vertical section of a dorsiventral leaf
(a) is not distinct
(b) faces the ventral epidermis of the leaf
(c) faces the dorsal epidermis of the leaf
(d) is surrounded by metaxylem

Answer

Answer: (c)

4. This is not a characteristic feature of anatomy of dicotyledonous root
(a) Pith little or absent
(b) Secondary growth
(c) Radial vascular bundles
(d) Vascular bundles 15-20

Answer

Answer: (d)

5. Vascular bundles are scattered in
(a) Dicot stem
(b) Dicot root
(c) Bryophytes
(d) Monocot stem

Answer

Answer: (d)

6. The correct situation of mesophyll in isobilateral grass leaf is shown by
(a) Palisade along both the surface
(b) Undifferentiated mesophyll
(c) Palisade towards abaxial surface
(d) Palisade towards adaxial surface

Answer

Answer: (b)

7. Well-developed pith is found in
(a) Monocot root and Dicot stem
(b) Dicot root and Dicot stem
(c) Dicot root and Monocot stem
(d) Dicot and Monocot stems

Answer

Answer: (a)

8. In monocot leaf
(a) Veins form a network
(b) Mesophyll is not differentiated into palisade and spongy parenchyma
(c) Mesophyll is well differentiated into these parts
(d) Bulliform cells are absent from epidermis

Answer

Answer: (b)

9. In orchids, Velamen tissues is found in
(a) Leaves
(b) Root
(c) Flowers
(d) Shoot

Answer

Answer: (b)

10. Polyarch and exarch vascular bundles occur in
(a) Dicot stem
(b) Monocot stem
(c) Dicot root
(d) Monocot root

Answer

Answer: (d)

300+ TOP MCQs on Global Warming and Answers

MCQs on Global Warming :

1. This process is functional in removing carbon dioxide from the atmosphere
(a) lightning
(b) deforestation
(c) burning of fossil fuels
(d) photosynthesis

Answer

Answer: (d)

2. Mainly, Ozonosphere is depleted by
(a) CFCs
(b) excess CO₂
(c) ozone
(d) excess CO

Answer

Answer: (a)

3. This is not a possible adverse effect of global warming
(a) sea level rise
(b) an increase of UVB radiation
(c) retreat of glaciers
(d) extraordinary weather patterns

Answer

Answer: (b)

4. Correct descending order of relative contribution of various greenhouse gases to total global warming is
(a) carbon dioxide; methane; CFCs; nitrous oxide
(b) carbon dioxide; methane; nitrous oxide; CFCs
(c) carbon dioxide; CFCs; nitrous oxide; methane
(d) carbon dioxide; CFCs; methane; nitrous oxide

Answer

Answer: (a)

5. CFC have a continuing effect on ozone layer as
(a) they are efficiently absorbed by atmospheric water vapours
(b) they are being produced in increasing amounts all over the world
(c) Cl atoms formed by them are used up in reactions causing degradation of ozone
(d) Cl atoms formed by them only act as catalysts in reactions causing degradation of ozone

Answer

Answer: (d)

6. CFCs are crucial in global warming along with their role in ozone depletion as it
(a) known for destroying ozone, which cools the earth
(b) blocks ultraviolet-B radiation
(c) absorbs solar radiation
(d) absorbs earthshine in 10 micron region

Answer

Answer: (d)

7. Which of the following is not a major greenhouse gas?
(a) ozone
(b) water vapour
(c) methane
(d) carbon dioxide

Answer

Answer: (a)

8. Ultraviolet radiations from sunlight cause a reaction producing
(a) carbon monoxide
(b) ozone
(c) fluorides
(d) sulphur dioxide

Answer

Answer: (a)

9. Surplus of atmospheric carbon dioxide causes an increase in the greenhouse effect as carbon dioxide
(a) is opaque to infrared rays
(b) is not opaque to infrared rays
(c) precipitates dust in the atmosphere
(d) reduce atmospheric pressure

Answer

Answer: (a)

10. Checking of re radiating heat by atmosphere carbon dioxide, dust, methane, ozone is known as
(a) solar effect
(b) radioactive effect
(c) ozone layer
(d) greenhouse effect

Answer

Answer: (d)