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3 questions

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
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
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
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is : Answer: 2. Root pressure Key idea: Loss of liquid water from leaf tips at night is guttation, caused by root pressure. At night, with high s... Seed germination, phases and rate of growth, conditions of growth 1 answer
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their : Answer: 3. Defence action Key idea: Secondary metabolites are not needed for basic growth but have ecological roles. Nicotine, strychnine an... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of : Answer: 2. 1 molecule of 3-C compound Key idea: In photorespiration RuBisCO acts as an oxygenase on RuBP. RuBP (5C) plus O₂ gives one molecu... C3 and C4 pathways, photorespiration 1 answer
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to : Answer: 1. Insect pests Key idea: The Bt toxin (Cry protein) kills certain insects. Bt cotton is resistant to insect pests such as cotton bo... Applications in agriculture: GMOs, Bt crops 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
Identify the wrong statement with reference to immunity. Answer: 3. Active immunity is quick and gives full response. Key idea: Active immunity is slow; passive immunity is quick. In active immunit... Immunology basics and vaccines 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
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
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
Match the following hormones with the respective disease :(a) Insulin (i) Addison's disease(b) Thyroxin (ii) Diabetes insipidus(c) Corticoids (iii) Acromegaly(d) Growth Hormone (iv) Goitre(v) Diabetes mellitusSelect the correct option. Answer: 3. (a)-(v), (b)-(iv), (c)-(i), (d)-(iii) Key idea: Match each hormone with the disorder from its deficiency or excess. Insulin: diab... Hormonal disorders 1 answer
Select the correct option. Answer: 4. There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs. Key idea: Humans have... Skeletal system, joints and disorders 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
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
In which of the following techniques, the embryos are transferred to assist those females who cannot conceive ? Answer: 1. ZIFT and IUT Key idea: Techniques that transfer an embryo, not gametes, are ZIFT and IUT. In ZIFT, a zygote or early embryo (up t... Amniocentesis, infertility and ART (IVF, ZIFT, GIFT) 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
Choose the correct pair from the following : Answer: 1. Ligases - Join the two DNA molecules Key idea: Ligases join DNA fragments. DNA ligase seals the sugar-phosphate backbone between... Tools: restriction enzymes, vectors, host 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
Match the following columns and select the correct option.Column - I: (a) Gregarious, polyphagous pest (b) Adult with radial symmetry and larva with bilateral symmetry (c) Book lungs (d) BioluminescenceColumn - II: (i) Asterias (ii) Scorpion (iii) Ct… Answer: 2. (a) (iv), (b) (i), (c) (ii), (d) (iii) Key idea: Match each feature with the animal. Gregarious polyphagous pest: Locusta (iv) Ad... Non-chordates up to phyla 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
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

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