NEET UG

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The first menstruation is called : Answer: 2. Menarche Key idea: The first menstrual flow at puberty is menarche. Menopause is the permanent end of cycles, diapause is delayed... Menstrual cycle 1 answer
Which of following organisms cannot fix nitrogen?A. AzotobacterB. OscillatoriaC. AnabaenaD. VolvoxE. NostocChoose the correct answer from the options given below: Answer: 2. D only Key idea: Volvox is a green alga and cannot fix nitrogen. Azotobacter (free-living bacterium) and Oscillatoria, Anabaena,... Biocontrol agents and biofertilizers 1 answer
Match List - I with List - II.List - I: A. Centromere; B. Cilium; C. Cristae; D. Cell membraneList - II: I. Mitochondrion; II. Cell division; III. Cell movement; IV. Phospholipid BilayerChoose the correct answer from the options given below : Answer: 4. A-II, B-III, C-I, D-IV Centromere: cell division (II) Cilium: cell movement (III) Cristae: mitochondrion (I) Cell membrane: phosp... Cell theory, prokaryotic and eukaryotic cells, plant vs animal cell 1 answer
A specialised membranous structure in a prokaryotic cell which helps in cell wall formation, DNA replication and respiration is : Answer: 1. Mesosome Key idea: Mesosomes are infoldings of the plasma membrane in prokaryotes. They help in cell wall formation, DNA replicat... Cell theory, prokaryotic and eukaryotic cells, plant vs animal cell 1 answer
Name the class of enzyme that usually catalyze the following reaction :S – G + S# → S + S# – GWhere, G → a group other than hydrogenS → a substrateS# → another substrate Answer: 3. Transferase Key idea: Transferases move a group (not hydrogen) from one substrate to another. The reaction S-G + S# → S + S#-G tr... Enzymes: types, properties, action, classification 1 answer
Which one of the following enzymes contains 'Haem' as the prosthetic group? Answer: 4. Catalase Key idea: Catalase contains a haem group as its prosthetic group. RuBisCO has none, carbonic anhydrase uses zinc, and su... Enzymes: types, properties, action, classification 1 answer
The correct sequence of events in the life cycle of bryophytes isA. Fusion of antherozoid with egg.B. Attachment of gametophyte to substratum.C. Reduction division to produce haploid spores.D. Formation of sporophyte.E. Release of antherozoids into w… Answer: 3. B, E, A, D, C Key idea: In bryophytes, the gametophyte is dominant and the sporophyte depends on it. B: gametophyte attaches to t... Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms 1 answer
Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.A. Prothallus stageB. Meiosis in spore mother cellsC. FertilisationD. Formation of archegonia and antheridia in gametophyte.E. Transfe… Answer: 1. B, A, D, E, C Key idea: In pteridophytes the dominant sporophyte makes spores by meiosis, which grow into the gametophyte. B: mei... Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms 1 answer
What is the pattern of inheritance for polygenic trait? Answer: 2. Non-mendelian inheritance pattern Key idea: Polygenic traits are controlled by many genes, each with a small additive effect, and... Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance 1 answer
Given below are two statements :Statement I : Transfer RNAs and ribosomal RNA do not interact with mRNA.Statement II : RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.In the light of the above statement… Answer: 4. Statement I is incorrect but statement II is correct Key idea: tRNA and rRNA do interact with mRNA during translation. Statement... Transcription, genetic code, translation, protein biosynthesis 1 answer
Which of the following are the post-transcriptional events in an eukaryotic cell?A. Transport of pre-mRNA to cytoplasm prior to splicing.B. Removal of introns and joining of exons.C. Addition of methyl group at 5' end of hnRNA.D. Addition of adenine… Answer: 2. B, C, D only Key idea: Post-transcriptional processing of hnRNA includes splicing (B), 5' capping with methylguanosine (C) and ta... Transcription, genetic code, translation, protein biosynthesis 1 answer
Match List I with List II :List I: A. Chlorophyll a; B. Chlorophyll b; C. Xanthophylls; D. CarotenoidsList II: I. Yellow-green; II. Yellow; III. Blue-green; IV. Yellow to Yellow-orangeChoose the option with all correct matches. Answer: 2. A-III, B-I, C-II, D-IV Chlorophyll a: blue-green (III) Chlorophyll b: yellow-green (I) Xanthophylls: yellow (II) Carotenoids: yel... Photosynthesis: site and pigments 1 answer
Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants? Answer: 4. Cytokinin Key idea: Cytokinins delay leaf senescence by promoting nutrient mobilisation. Ethylene and abscisic acid promote senes... Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA 1 answer
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : A typical unfertilised, angiosperm embryo sac at maturity is 8 nucleate and 7-celled.Reason (R) : The egg apparatus has 2 polar… Answer: 3. A is true but R is false Key idea: The mature embryo sac is 7-celled and 8-nucleate, so A is true. The reason is false: the egg a... Flower structure, male and female gametophytes 1 answer
In the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called : Answer: 4. Aleurone layer Key idea: The aleurone layer is the outer protein-rich layer of the endosperm in cereal grains, separating it from... Flower, fruit and seed 1 answer
Find the statement that is NOT correct with regard to the structure of monocot stem. Answer: 1. Hypodermis is parenchymatous. Key idea: In a monocot stem the hypodermis is sclerenchymatous, not parenchymatous. The other state... Plant tissues and anatomy of root, stem, leaf 1 answer
Which are correct:A. Computed tomography and magnetic resonance imaging detect cancers of internal organs.B. Chemotherapeutics drugs are used to kill non-cancerous cells.C. α-interferon activate the cancer patients' immune system and helps in destroy… Answer: 4. A and C only A: correct. CT and MRI detect cancers of internal organs. B: wrong. Chemotherapeutic drugs kill cancer cells, though... Cancer 1 answer
Which of the following genetically engineered organisms was used by Eli Lilly to prepare human insulin? Answer: 1. Bacterium Key idea: Eli Lilly produced human insulin in 1983 using the bacterium E. coli. They made the A and B chains separately... Applications in health: human insulin, vaccines, gene therapy 1 answer
Identify the part of a bio-reactor which is used as a foam braker from the given figure. Answer: 4. C Key idea: In a stirred-tank bioreactor the foam breaker is a blade on the shaft near the top, in the headspace above the cultur... Processes of recombinant DNA technology 1 answer
In the above represented plasmid an alien piece of DNA is inserted at EcoRI site. Which of the following strategies will be chosen to select the recombinant colonies? Answer: 3. White color colonies will be selected. Key idea: The figure shows the EcoRI site inside the gene for β -galactosidase. Inserting... Tools: restriction enzymes, vectors, host 1 answer
While trying to find out the characteristic of a newly found animal, a researcher did the histology of adult animal and observed a cavity with presence of mesodermal tissue towards the body wall but no mesodermal tissue was observed towards the alime… Answer: 2. Pseudocoelomate Key idea: A pseudocoelom is a body cavity only partly lined by mesoderm. Here mesoderm is present towards the bod... Basis of animal classification 1 answer
Cardiac activities of the heart are regulated by :A. Nodal tissueB. A special neural centre in the medulla oblongataC. Adrenal medullary hormonesD. Adrenal cortical hormonesChoose the correct answer from the options given below : Answer: 1. A, B and C Only Key idea: The heart is regulated by nodal tissue (autorhythmic), the medullary cardiac centre (neural) and adrena... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Which of the following diagrams is correct with regard to the proximal (P) and distal (D) tubule of the Nephron. Answer: 2. Diagram option (2): P: HCO3-, NaCl, H2O out; H+, NH3 in. D: NaCl, H2O, HCO3- out; K+, H+ in Key idea: The proximal tubule reabsor... Excretion: modes, nephron, urine formation, osmoregulation 1 answer
Match List - I with List - II.List - I: A. Head; B. Middle piece; C. Acrosome; D. TailList - II: I. Enzymes; II. Sperm motility; III. Energy; IV. Genetic materialChoose the correct answer from the options given below : Answer: 1. A-IV, B-III, C-I, D-II Head: genetic material (IV) Middle piece: mitochondria give energy (III) Acrosome: enzymes for penetrating... Gametogenesis: spermatogenesis and oogenesis 1 answer

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