NEET UG

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While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (-) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for o… Answer: 2. Predation Predation is (+) for the predator and (-) for the prey. Competition is (-,-), amensalism is (-,0) and commensalism is (... Population interactions: mutualism, competition, predation, parasitism 1 answer
If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as : Answer: 2. Sequence annotation In the sequence annotation approach, the whole genome is sequenced blindly and functions are assigned to segm... Human genome project and DNA fingerprinting 1 answer
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :Mendel's law of Independent assortment does not hold good for the genes that are located closely on the same chromosome.Reason (R… Answer: 4. (A) is correct but (R) is not correct Assertion: genes close together on the same chromosome are linked and tend to be inherited... Mendelian inheritance 1 answer
Which of the following occurs due to the presence of autosome linked dominant trait ? Answer: 3. Myotonic dystrophy Myotonic dystrophy is an autosomal dominant disorder. Thalassemia and sickle cell anaemia are autosomal recess... Sex-linked inheritance, Mendelian and chromosomal disorders 1 answer
What is the role of large bundle shealth cells found around the vascular bundles in C_4 plants ? Answer: 3. To increase the number of chloroplast for the operation of Calvin cycle The large bundle sheath cells of C₄ plants hold many chlo... C3 and C4 pathways, photorespiration 1 answer
Which part of the fruit, labelled in the given figure makes it a false fruit ? Answer: 4. C → Thalamus A false fruit develops from parts other than the ovary, here the thalamus. In the figure (apple), the large outer fl... Flower, fruit and seed 1 answer
The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.(a) It is also called as the earlywood(b) In spring season cambium produces xylem elements with narrow vessels(c) It is lighter in colour(… Answer: 3. (a), (c), (d) and (e) Only (a) Springwood is also called earlywood: true. (b) It has wide vessels, not narrow: false. (c) It is l... Plant tissues and anatomy of root, stem, leaf 1 answer
In the following palindromic base sequences of DNA, which one can be cut easily by particular restriction enzyme ? Answer: 3. 5'GAATTC3'; 3'CTTAAG5' A palindromic site reads the same 5' to 3' on both strands. 5'GAATTC3' with complementary 3'CTTAAG5' is a... Tools: restriction enzymes, vectors, host 1 answer
Transposons can be used during which one of the following ? Answer: 3. Gene silencing As per the official key, the answer is gene silencing: transposons (jumping genes) can insert in or near a gene an... Tools: restriction enzymes, vectors, host 1 answer
Given below are two statements :Statement I :Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.Statement II :Restriction endonucleases cut the DNA strand a little away from the centre of the pal… Answer: 2. Both Statement I and Statement II are correct Key idea: Restriction enzymes recognise palindromic sequences and cut each strand s... Tools: restriction enzymes, vectors, host 1 answer
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :All vertebrates are chordates but all chordates are not vertebrates.Reason (R) :Notochord is replaced by vertebral column in the… Answer: 2. Both (A) and (R) are correct and (R) is the correct explanation of (A) Key idea: Chordates have a notochord. In vertebrates it is... Chordates up to classes 1 answer
Given below are two statements :Statement I :The coagulum is formed of network of threads called thrombins.Statement II :Spleen is the graveyard of erythrocytes.In the light of the above statements, choose the most appropriate answer from the options… Answer: 1. Statement I is incorrect but Statement II is correct Key idea: The clot is made of fibrin, not thrombin. Statement I: the coagulu... Body fluids: blood, blood groups, coagulation, lymph 1 answer
Nitrogenous waste is excreted in the form of pellet or paste by : Answer: 1. Pavo Key idea: Birds are uricotelic. Their uric acid leaves as a semi-solid pellet or paste, which saves water. Pavo (peacock) is... Excretion: modes, nephron, urine formation, osmoregulation 1 answer
Which of the following is present between the adjacent bones of the vertebral column ? Answer: 3. Cartilage Key idea: Adjacent vertebrae are separated by intervertebral discs made of fibrocartilage. These cartilaginous discs ac... Skeletal system, joints and disorders 1 answer
Lippe's loop is a type of contraceptive used as : Answer: 4. Non-Medicated IUD Key idea: Lippes loop is a plastic, inert intrauterine device. IUDs come in three types: non-medicated (Lippes... Birth control, contraception and MTP 1 answer
At which stage of life the oogenesis process is initiated ? Answer: 3. Embryonic development stage Key idea: Oogenesis begins before birth, during the embryonic stage. Oogonia form in the foetal ovary... Gametogenesis: spermatogenesis and oogenesis 1 answer
Which of the following is not a connective tissue ? Answer: 1. Neuroglia Key idea: Neuroglia are supporting cells of nervous tissue. Blood, adipose tissue and cartilage are all connective tiss... Animal tissues: epithelial, connective, muscular, neural 1 answer
Which one of the following produces nitrogen fixing nodules on the roots of Alnus ? Answer: 3. Frankia Frankia is the actinomycete that forms nitrogen-fixing root nodules in non-leguminous plants such as Alnus. Rhizobium nod... Biocontrol agents and biofertilizers 1 answer
Exoskeleton of arthropods is composed of : Answer: 4. Chitin The arthropod exoskeleton is made of chitin, a polymer of N-acetylglucosamine. Glucosamine is only its monomer unit, cutin... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Read the following statements and choose the set of correct statements :(a) Euchromatin is loosely packed chromatin(b) Heterochromatin is transcriptionally active(c) Histone octomer is wrapped by negatively charged DNA in nucleosome(d) Histones are r… Answer: 3. (a), (c), (d) Only (a) Euchromatin is loosely packed and transcriptionally active: true. (b) Heterochromatin is densely packed an... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
Which of the following is incorrectly matched ? Answer: 3. Ulothrix - Mannitol Green algae like Ulothrix store starch, not mannitol. Mannitol is the reserve food in brown algae. Other pair... Plant kingdom: algae, bryophytes, pteridophytes, gymnosperms 1 answer
Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for : Answer: 4. Biodiversity loss Habitat loss and fragmentation, over-exploitation, alien species invasion and co-extinction are the four major... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following is not a method of ex situ conservation ? Answer: 3. National Parks National parks protect organisms in their natural habitat, so they are in situ conservation. Cryopreservation, in... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which one of the following statements cannot be connected to Predation ? Answer: 4. Both the interacting species are negatively impacted In predation, one species (predator) benefits (+) and the other (prey) is ha... Population interactions: mutualism, competition, predation, parasitism 1 answer

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