Zoology

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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
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
In gel electrophoresis, separated DNA fragments can be visualized with the help of : Answer: 2. Ethidium bromide in UV radiation Key idea: DNA in agarose gels is stained with ethidium bromide and viewed under UV light. Ethidi... Processes of recombinant DNA technology 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
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
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
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
Cuboidal epithelium with brush border of microvilli is found in : Answer: 3. proximal convoluted tubule of nephron Key idea: Brush-border cuboidal epithelium is found where absorption and secretion occur. I... Animal tissues: epithelial, connective, muscular, neural 1 answer
Which of the following immune responses is responsible for rejection of kidney graft ? Answer: 4. Cell-mediated immune response Key idea: Graft rejection is a cell-mediated response. T-lymphocytes recognise the foreign tissue a... Immunology basics and vaccines 1 answer
Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for typhoid. Answer: 4. textitSalmonella typhi / Widal test Key idea: Typhoid is caused by Salmonella typhi and diagnosed by the Widal test. Plasmodium v... Pathogens and parasites causing human diseases 1 answer
Which of the following is true for Golden rice ? Answer: 1. It is Vitamin A enriched, with a gene from daffodil. Key idea: Golden rice is a biofortified rice rich in provitamin A (beta-caro... Applications in agriculture: GMOs, Bt crops 1 answer
What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm ? Answer: 3. Alkaline pH of gut Key idea: The Bt protoxin is activated by alkaline pH. Bt toxin crystals exist as inactive protoxin. In the al... Applications in agriculture: GMOs, Bt crops 1 answer
Match the following organisms with their respective characteristics :(a) Pila (i) Flame cells(b) Bombyx (ii) Comb plates(c) Pleurobrachia (iii) Radula(d) Taenia (iv) Malpighian tubulesSelect the correct option from the following : Answer: 2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i) Key idea: Match each animal with its characteristic organ. Pila (mollusc): radula, (iii).... Non-chordates up to phyla 1 answer
A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population ? Answer: 3. 0.16 (AA); 0.48 (Aa); 0.36 (aa) Key idea: Hardy-Weinberg: p² + 2pq + q² = 1 . p = 0.4 , so q = 1 - 0.4 = 0.6 . AA = p² = 0.16 ; A... Gene flow, genetic drift, Hardy-Weinberg principle 1 answer
Which of the following glucose transporters is insulin-dependent ? Answer: 4. GLUT IV Key idea: GLUT4 is the insulin-regulated glucose transporter. GLUT4 is found in skeletal muscle and adipose tissue; insul... Endocrine glands and hormones, mechanism of action 1 answer

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