NEET UG

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Which of the following statements are true for the phylum-Chordata ?(a) In Urochordata notochord extends from head to tail and it is present throughout their life.(b) In Vertebrata notochord is present during the embryonic period only.(c) Central ner… Answer: 4. (b) and (c) Key idea: Check each statement. (a) False: in Urochordata the notochord is present only in the larval tail. (b) True... Chordates up to classes 1 answer
Match the following columns and select the correct option.Column - I: (a) 6 - 15 pairs of gill slits (b) Heterocercal caudal fin (c) Air Bladder (d) Poison stingColumn - II: (i) Trygon (ii) Cyclostomes (iii) Chondrichthyes (iv) Osteichthyes Answer: 1. (a) (ii), (b) (iii), (c) (iv), (d) (i) Key idea: Match each feature with its group. 6-15 pairs of gill slits: cyclostomes (ii) He... Chordates up to classes 1 answer
Embryological support for evolution was disapproved by : Answer: 1. Karl Ernst von Baer Key idea: Karl Ernst von Baer showed that embryos do not pass through the adult stages of other animals. Haec... Evidences of evolution 1 answer
Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action ?(a) Darwin's Finches of Galapagos islands.(b) Herbicide resistant weeds.(c) Drug resistant eukaryo… Answer: 3. (b), (c) and (d) Key idea: Look for evolution driven by human-caused environmental change. (b) Herbicide-resistant weeds, (c) dru... Mechanism: variation, mutation, recombination, natural selection 1 answer
By which method was a new breed 'Hisardale' of sheep formed by using Bikaneri ewes and Marino rams ? Answer: 3. Cross breeding Hisardale is a product of cross breeding, in which superior males of one breed are mated with superior females of... Mechanism: variation, mutation, recombination, natural selection 1 answer
From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask : Answer: 1. CH₄ , H₂ , NH₃ and water vapor at 800°C Key idea: Miller used the gases thought to be in the early atmosphere. He mixed CH₄ , H₂... Origin of life 1 answer
Identify the wrong statement with reference to transport of oxygen. Answer: 3. Higher H^+ conc. in alveoli favours the formation of oxyhaemoglobin. Key idea: Oxygen binding to haemoglobin is favoured by high... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Select the correct events that occur during inspiration.(a) Contraction of diaphragm(b) Contraction of external inter-costal muscles(c) Pulmonary volume decreases(d) Intra pulmonary pressure increases Answer: 1. (a) and (b) Key idea: Inspiration is an active process that increases thoracic volume. The diaphragm and external intercostal mus... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Meiotic division of the secondary oocyte is completed : Answer: 4. At the time of fusion of a sperm with an ovum Key idea: The secondary oocyte is arrested in metaphase II and completes meiosis II... Fertilisation, embryo development to blastocyst, implantation 1 answer
If the head of cockroach is removed, it may live for few days because : Answer: 3. the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body. Key idea: A... Animal tissues: epithelial, connective, muscular, neural 1 answer
The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are : Answer: 4. Ammonia and hydrogen Key idea: Nitrogenase reduces nitrogen to ammonia and releases hydrogen. The reaction is N₂ + 8e^- + 8H^+ +... Biocontrol agents and biofertilizers 1 answer
Identify the substances having glycosidic bond and peptide bond, respectively in their structure : Answer: 4. Inulin, insulin Key idea: Glycosidic bonds link sugars in polysaccharides; peptide bonds link amino acids in proteins. Inulin is... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Identify the correct statement with regard to G_1 phase (Gap 1) of interphase. Answer: 3. Cell is metabolically active, grows but does not replicate its DNA. Key idea: G₁ is the growth phase before DNA replication. In G... Cell cycle, mitosis, meiosis 1 answer
Which of the following statements about inclusion bodies is incorrect ? Answer: 2. These are involved in ingestion of food particles. Key idea: Inclusion bodies are non-membrane-bound reserve materials lying free... Cell theory, prokaryotic and eukaryotic cells, plant vs animal cell 1 answer
Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells ? Answer: 3. Golgi bodies Key idea: Golgi bodies modify and package products from the ER. Proteins and lipids from the ER reach the Golgi, whe... Endomembrane system: ER, Golgi, lysosomes, vacuoles 1 answer
Which of these following methods is the most suitable for disposal of nuclear waste ? Answer: 4. Bury the waste within rocks deep below the Earth's surface Key idea: Nuclear waste must be stored in a safe, geologically stable... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which of the following is not an attribute of a population ? Answer: 4. Species interaction Key idea: Attributes of a population are properties of the group as a whole, not of individuals or of interac... Population attributes: growth, birth and death rate, age distribution 1 answer
Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups. Answer: 3. When I^A and I^B are present together, they express same type of sugar. Key idea: In AB blood group, I^A and I^B are codominant a... Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance 1 answer
Select the correct match. Answer: 3. Sickle cell anaemia - Autosomal recessive trait, chromosome-11 Key idea: Recall the mode of inheritance of each disorder. Haemoph... Sex-linked inheritance, Mendelian and chromosomal disorders 1 answer
The process of growth is maximum during : Answer: 1. Log phase Key idea: Growth follows a sigmoid curve and is fastest in the exponential (log) phase. In the lag phase growth is slow... Seed germination, phases and rate of growth, conditions of growth 1 answer
The plant parts which consist of two generations - one within the other :(a) Pollen grains inside the anther(b) Germinated pollen grain with two male gametes(c) Seed inside the fruit(d) Embryo sac inside the ovule Answer: 4. (a) and (d) Key idea: Two generations one inside the other means a gametophyte developing inside a sporophyte structure, i.e., a... Flower structure, male and female gametophytes 1 answer
The roots that originate from the base of the stem are : Answer: 1. Fibrous roots Key idea: Roots arising from the base of the stem are adventitious and, in monocots, form a fibrous root system. In... Morphology: root, stem, leaf and modifications 1 answer
Match the following diseases with the causative organism and select the correct option.Column - I: (a) Typhoid (b) Pneumonia (c) Filariasis (d) MalariaColumn - II: (i) Wuchereria (ii) Plasmodium (iii) Salmonella (iv) Haemophilus Answer: 2. (a) (iii), (b) (iv), (c) (i), (d) (ii) Key idea: Match each disease with its pathogen. Typhoid: Salmonella (iii) Pneumonia: Haemo... Pathogens and parasites causing human diseases 1 answer
The infectious stage of Plasmodium that enters the human body is : Answer: 2. Sporozoites Key idea: Female Anopheles injects sporozoites into the human body when it bites. Sporozoites go to the liver and mul... Pathogens and parasites causing human diseases 1 answer

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