300+ REAL TIME NEET Biology Objective Questions & Answers 2023

300+ TOP MCQs on Multinodular Goitre 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 Multinodular Goitre Multiple Choice Questions

MCQs on Multinodular Goitre :

1. Which of the following disease is caused due to the deficiency of iodine?
(a) Solitary thyroid nodules
(b) Goitre
(c) Thyroiditis
(d) Thyroid cancer

Answer

Answer: (b)

2. Which of the following is the main cause for Goitre?
(a) Hypothyroidism
(b) Hyperthyroidism
(c) Cancer of the thyroid gland
(d) All of the above

Answer

Answer: (d)

3. When the progressive enlargement of a multinodular goitre causes symptomatic tracheal compression, the typically preferred treatment management in otherwise good-risk patients is ____.
(a) Radioactive iodine treatment
(b) Thyroid hormone treatment
(c) Iodine treatment
(d) Surgical resection of abnormal thyroid

Answer

Answer: (d)

4. Which of the following is the most precise diagnostic screening procedure for differentiating benign thyroid nodules from malignant ones?
(a) Thyroid scintiscan
(b) Thyroid ultrasonography
(c) Thyroid hormone suppression
(d) Fine-needle-aspiration biopsy (FNAB)

Answer

Answer: (d)

5. Which of the following is the most common cause of goitrous hypothyroidism in adults?
(a) Hashimoto’s disease
(b) Grave’s disease
(c) Riedel’s thyroiditis
(d) De Quervain’s thyroiditis

Answer

Answer: (a)

6. A person with the enlarged thyroid gland protruded eyeball, increased BMR and weight loss is suffering from _______.
(a) Grave’s disease
(b) Exophthalmic goitre
(c) Both (a) and (b)
(d) Addison disease

Answer

Answer: (c)

7. Which of the following statement is incorrect about thyroid hormones?
(a) Regulates BMR
(b) Maintains water and electrolyte balance
(c) Supports erythropoiesis
(d) Controls blood phosphate level

Answer

Answer: (d)

8. Which of the following statement is true about thyroid swelling?
(a) Always elevates on swelling
(b) An ultrasound of the swelling is the best test to determine whether the nodule is actively secreting hormone
(c) Lymph node enlargement is a good prognostic sign
(d) A functional nodule on isotope scanning is unlikely to be due to cancer

Answer

Answer: (d)

9. Which of the following statement is true about Grave’s disease of the thyroid?
(a) It is the cause for ophthalmoplegia
(b) It is the cause for large multi-nodular goitre
(c) In the past, grave’s disease sometimes caused ‘Derbyshire Neck’
(d) It is most common in males than in females

Answer

Answer: (a)

10. Which of the following statement is true about complications of a large goitre?
(a) Dysphagia is an indication for surgery
(b) Causes stridor due to compression of the oesophagus
(c) Causes hoarseness due to compression of the trachea
(d) Causes more florid thyrotoxicosis than a smaller goitre

Answer

Answer: (a)

300+ TOP MCQs on Deoxyribonucleic acid(DNA) structure and Answers

MCQs on Deoxyribonucleic acid(DNA) structure :

1. DNA fingerprinting recognizes the differences in
(a) satellite DNA
(b) bulk DNA
(c) Repetitive DNA
(d) both (a) and (c)

Answer

Answer: (d)

2. This force can stabilize a DNA double-helix
(a) Hydrophilic sugar-phosphate groups are found on the exterior of the helix where interaction with water occurs
(b) Hydrophobic bases are present in the interior of the helix, each base-pair is stabilized by the same number of hydrogen bonds
(c) covalent base stacking interactions may take place between neighbouring bases within the same strand in the helix
(d) non-covalent N-glycosidic bonds may form between nitrogenous bases in opposite strands in the helix

Answer

Answer: (a)

3. In this type of DNA replication, of the two newly formed molecules, one is purely a new one and the other is an old one
(a) dispersive
(b) conservative
(c) semiconservative
(d) both (b) and (c)

Answer

Answer: (c)

4. The process of DNA replication is affected by an enzyme known as
(a) Mutase
(b) Ligase
(c) Polymerase I
(d) Ribonuclease

Answer

Answer: (c)

5. A DNA molecule in which both strands have radioactive thymidine is permitted to replicate in an environment that contains non-radioactive thymidine. What is the right number of DNA molecules which possess some radioactive thymidine post three duplications?
(a) one such molecule
(b) two such molecules
(c) four such molecules
(d) eight such molecules

Answer

Answer: (b)

6. If the DNA strand has nitrogenous base sequence ATTGCC, the mRNA will have?
(a) ATTGCA
(b) UGGACC
(c) UAACGG
(d) ATCGCC

Answer

Answer: (c)

7. The type of coiling in DNA is
(a) Zig-zag
(b) Left-handed
(c) Opposite
(d) Right-handed

Answer

Answer: (d)

8. In DNA, the enzyme which breaks the H₂ bonds is
(a) Ligase
(b) Helicase
(c) Topoisomerase
(d) Polymerase

Answer

Answer: (b)

9. The total DNA comprises what amount of cytoplasmic DNA in cells?
(a) 95-99%
(b) 65-75%
(c) 45-50%
(d) 1-5%

Answer

Answer: (d)

10. The bases are held together in a DNA double helix by hydrogen bonds. These bonds are
(a) Ionic bonds
(b) Covalent bonds
(c) Non-covalent bonds
(d) Van der Waals forces

Answer

Answer: (c)

300+ TOP MCQs on Plant systematics and Answers

MCQs on Plant systematics :

1. The level of taxonomic study related to biological aspects of taxa, inclusive of intraspecific populations, speciation, evolutionary trends and rates is
(a) theta taxonomy
(b) alpha taxonomy
(c) beta taxonomy
(d) gamma taxonomy

Answer

Answer: (d)

2. The process wherein the labellum in Orchidaceae surfaces at the anterior side via the twisting of the ovary through 180 degree
(a) Articulation
(b) Adnation
(c) Attenuation
(d) Resupination

Answer

Answer: (d)

3. The organization of taxonomic information in logical classification is known as
(a) Phenetic
(b) Systematics
(c) Dendogram
(d) Phylogenetic

Answer

Answer: (b)

4. One of these is not a plant fossil
(a) Rhynia
(b) Lepidocarpon
(c) Lepidodendron
(d) Archaeopteryx

Answer

Answer: (d)

5. The primary advantage of Bentham and Hookers classification is
(a) It is a system whose basis is on evolutionary concepts
(b) It is a natural system of classification of all plant groups
(c) Deemed to be the phylogenetic aspect as well
(d) The taxa description is based on the actual examination of the specimens

Answer

Answer: (d)

6. Α taxonomy pertains to
(a) Chemotaxonomy
(b) Phylogeny
(c) Classical taxonomy
(d) Experimental taxonomy

Answer

Answer: (c)

7. To comprehend general plant relationships, this is one of the best methods
(a) Experimental Taxonomy
(b) Numerical Taxonomy
(c) Cytotaxonomy
(d) Chemotaxonomy

Answer

Answer: (d)

8. The condition of Polyadelphous can be found in
(a) Rutaceae
(b) Leguminosae
(c) Compositae
(d) Liliaceae

Answer

Answer: (a)

9. Linnaeus is credited with the following
(a) Law of Limiting factor
(b) Binomial nomenclature
(c) Concept of inheritance
(d) Theory of heredity

Answer

Answer: (b)

10. The reason why the system of plant classification proposed by Carolus Linnaeus was artificial is
(a) Because it considered the physiological facts along with the morphological traits
(b) Because it was based on the similarities and differences in floral and other morphological characters only
(c) Because it was on the basis of evolutionary relationships of plants
(d) None of these

Answer

Answer: (b)

300+ TOP MCQs on Microbes in Human Welfare and Answers

MCQs on Microbes in Human Welfare :

1. In Swiss cheese, big holes are made by a
(a) bacterium producing methane gas
(b) machine
(c) fungus releasing a lot of gases while its metabolic activities
(d) bacterium producing large quantities of carbon dioxide

Answer

Answer: (d)

2. During which stage of the purification of the sewage water are microbes used?
(a) Primary treatment
(b) Secondary treatment
(c) Tertiary treatment
(d) Both (1) and (2)

Answer

Answer: (b)

3. What does a high value of BOD(Biochemical Oxygen Demand) indicate?
(a) That water is pure
(b) that water is less polluted
(c) that water is highly polluted
(d) that consumption of organic matter by microbes is higher in the water

Answer

Answer: (c)

4. This entry in the table is wrongly matched

Option	Name of the Microbe	Product	Purpose
(a)	Monascus purpureus	Statins	Lowers blood cholesterol
(b)	Streptococcus	Streptokinase	Removes clots from blood vessels
(c)	Clostridium butylicum	Lipase	Oil stain removal
(d)	Trichoderma polysporum	Cyclosporin-A	Immunosuppressive d–g

Answer

Answer: (c)

5. This is a good producer of citric acid
(a) Aspergillus
(b) Clostridium
(c) Saccharomyces
(d) Pseudomonas

Answer

Answer: (a)

6. This is not an example of performing biological control of diseases/pests using microbes
(a) Trichoderma sp. against some plant pathogens
(b) Nucleopolyhedrovirus against insects and other arthropods
(c) Ladybird beetle against aphids
(d) Bt-cotton to increase yield

Answer

Answer: (d)

7. This is chiefly produced by the activity of an anaerobic bacteria on sewage
(a) Laughing gas
(b) Propane
(c) Mustard gas
(d) Marsh gas

Answer

Answer: (d)

8. For the production of ethanol, the most common substrate used in distilleries is
(a) Soya meal
(b) Molasses
(c) Ground gram
(d) cornmeal

Answer

Answer: (b)

9. This is not a biofertilizer
(a) Agrobacterium
(b) Nostoc
(c) Rhizobium
(d) Mycorrhiza

Answer

Answer: (a)

10. Carbon dioxide is not released in which of the following processes?
(a) Lactate fermentation
(b) Alcoholic fermentation
(c) Aerobic respiration in animals
(d) Aerobic respiration in plants

Answer

Answer: (a)

300+ TOP MCQs on Apoplast and Answers

MCQs on Apoplast :

1. In plants, water movement is
(a) up the potential gradient in both symplast and apoplast
(b) down the potential gradient in apoplast and up the potential gradient in symplast
(c) down the potential gradient in both symplast and apoplast
(d) down a potential gradient in symplast and up the potential gradient in apoplast

Answer

Answer: (c)

2. Pick the incorrect statement regarding apoplast movement
(a) movement of water is through mass flow
(b) gradient-dependant
(c) mass flow of water takes place as a result of cohesive and adhesive properties of water
(d) continuous water stream gets tension when water is absorbed by root hairs

Answer

Answer: (d)

3. In roots, most of the water flows through
(a) Symplast
(b) Apoplast
(c) Imbibition
(d) Active transport

Answer

Answer: (b)

4. Movement of water through apoplast stops at the level of ________ and crosses membrane to undergo symplast till xylem cells
(a) starch sheath
(b) inner layer of cortex
(c) endodermis
(d) all of the above

Answer

Answer: (d)

5. In plants, this about apoplast and symplast water movement is true
(a) being down a potential gradient
(b) an equal rate of transport
(c) conduction through interconnected protoplasts
(d) assistance by cytoplasmic streaming

Answer

Answer: (a)

6. Pressure in roots develops due to
(a) low osmotic soil potential
(b) rise in transpiration
(c) active absorption
(d) passive absorption

Answer

Answer: (c)

7. Which of the following statements does not hold true in context of apoplast?
(a) occurs through intercellular spaces and cell walls
(b) system of adjacent cell walls is continuous all through the plant
(c) crosses cell membrane
(d) discontinuous path at the place of casparian strips of endodermis in roots

Answer

Answer: (c)

8. This is not part of apoplast
(a) cell walls
(b) vessels
(c) intercellular spaces
(d) sieve tubes

Answer

Answer: (d)

9. Symplastic movement is slower than apoplastic movement because
(a) molecule has to enter through cell membrane
(b) it is down the gradient
(c) as it involves cytoplasmic streaming always
(d) all of the above

Answer

Answer: (a)

10. Most of the movement in roots through apoplast is due to
(a) endodermal cells are loosely packed and hence no resistance to water movement
(b) medullary cells are loosely packed and hence no resistance to water movement
(c) cortical cells are loosely packed and hence no resistance to water movement
(d) pericycle cells are loosely packed and hence no resistance to water movement

Answer

Answer: (c)

300+ TOP MCQs on Diseases Caused by Helminths and Answers

MCQs on Diseases Caused by Helminths :

1. Dracunculiasis is caused by the ___________ worm and transmitted by the __________ vector
(a) Dracunculus medinensis; freshwater crustacean
(b) Dracunculus medinensis; mollusc
(c) Mycobacterium ulcerans; freshwater crustacean
(d) Mycobacterium ulcerans; mollusc

Answer

Answer: (a)

2. Parasite that is also a vector host is
(a) Ascaris
(b) Bug
(c) Fasciola
(d) House fly

Answer

Answer: (b)

3. Filarial larva can be collected from man’s
(a) Peripheral blood at midnight
(b) smears of spleen
(c) smears of intestinal contents
(d) biopsy of liver

Answer

Answer: (a)

4. This disease is caused by a nematod
(a) Amoebiasis
(b) Leprosy
(c) Filariasis
(d) Poliomyelitis

Answer

Answer: (c)

5. This does not accurately describe Lymphatic filariasis
(a) intermediate vector is the mollusc
(b) mainly affects the lower limb
(c) Chyluria is the most common manifestation
(d) is caused by the parasitic worms Wuchereria bancrofti and Brugia malayi

Answer

Answer: (a)

6. All of these are symptoms of Dracunculiasis infection except
(a) Septic arthritis
(b) Abscess
(c) Facial redness
(d) Tetanus

Answer

Answer: (c)

7. Chenopodium oil is used in
(a) Smallpox
(b) Typhoid
(c) Ascariasis
(d) Tuberculosis

Answer

Answer: (c)

8. This insect transmits relapsing fever
(a) Cimex
(b) Apis
(c) Drosophila
(d) Gryllus

Answer

Answer: (a)

9. Enterobiasis diseases is caused by
(a) Hookworm
(b) Filarial worm
(c) Roundworm
(d) Pinworm

Answer

Answer: (d)

10. Which is a helminth disease
(a) Polio
(b) Filariasis
(c) Filaria
(d) Diphtheria

Answer

Answer: (b)