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3 questions

Match List - I with List - II.List - I: (a) Bronchioles (b) Goblet cell (c) Tendons (d) Adipose TissueList - II: (i) Dense Regular Connective Tissue (ii) Loose Connective Tissue (iii) Glandular Tissue (iv) Ciliated EpitheliumChoose the correct answer… Answer: 2. (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) Key idea: Match each structure with its tissue. (a) Bronchioles: ciliated epitheli... Animal tissues: epithelial, connective, muscular, neural 1 answer
The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome ? Answer: 1. a, c, b, d Key idea: Higher recombination frequency means a greater distance between genes. The farthest pair sits at the ends. T... Chromosome theory, linkage and crossing over 1 answer
Which one of the following statements is correct ? Answer: 4. Blood moves freely from atrium to the ventricle during joint diastole. Key idea: During joint diastole, both atria and ventricles... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Statements related to human Insulin are given below. Which statement(s) is/are correct about genetically engineered Insulin ?(a) Pro-hormone insulin contain extra stretch of C-peptide(b) A-peptide and B-peptide chains of insulin were produced separat… Answer: 3. (b) only Key idea: The question is about genetically engineered insulin. (b) Correct: A and B chains were made separately in E. c... Applications in health: human insulin, vaccines, gene therapy 1 answer
If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness ? Answer: 1. 100% Key idea: Colour blindness is X-linked recessive. The female is colour blind: X^cX^c . The man's mother was colour blind, so... Sex-linked inheritance, Mendelian and chromosomal disorders 1 answer
Which of the following are not the effects of Parathyroid hormone ?(a) Stimulates the process of bone resorption(b) Decreases Ca^2+ level in blood(c) Reabsorption of Ca^2+ by renal tubules(d) Decreases the absorption of Ca^2+ from digested food(e) In… Answer: 3. (b), (d) and (e) only Key idea: PTH raises blood mathrmCa²⁺ . (a) Stimulates bone resorption: true effect. (b) Decreases blood ma... Endocrine glands and hormones, mechanism of action 1 answer
Ten E.coli cells with ^15N - dsDNA are incubated in medium containing ^14N nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from ^15N ? Answer: 4. 60 cells Key idea: DNA replication is semi-conservative, and the question assumes the usual E. coli doubling time of 20 minutes.... DNA replication and central dogma 1 answer
Select the incorrect statement regarding synapses : Answer: 1. Impulse transmission across a chemical synapse is always faster than that across an electrical synapse. Key idea: Electrical syna... Neural control: neuron, nervous system, nerve impulse 1 answer
Given below are two statements :Statement I :In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles.Statement II :Particulate matter (PM 2.5) can not be removed by scrubber but can be remove… Answer: 1. Statement I is incorrect but Statement II is correct Key idea: Electric charging of dust belongs to the electrostatic precipitato... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following is not a desirable feature of a cloning vector ? Answer: 1. Presence of two or more recognition sites Key idea: A good cloning vector should have a single recognition site for the restricti... Tools: restriction enzymes, vectors, host 1 answer
Which of the following statements is not true ? Answer: 1. Flippers of penguins and dolphins are a pair of homologous organs Key idea: Homologous organs share origin; analogous organs shar... Evidences of evolution 1 answer
Match List - I with List - II with respect to methods of Contraception and their respective actions.List - I: (a) Diaphragms (b) Contraceptive Pills (c) Intra Uterine Devices (d) Lactational AmenorrheaList - II: (i) Inhibit ovulation and Implantation… Answer: 3. (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii) Key idea: Match each method to its action. (a) Diaphragms cover the cervix and blo... Birth control, contraception and MTP 1 answer
Match List - I with List - II.List - I (Biological Molecules): (a) Glycogen (b) Globulin (c) Steroids (d) ThrombinList - II (Biological functions): (i) Hormone (ii) Biocatalyst (iii) Antibody (iv) Storage productChoose the correct answer from the opt… Answer: 1. (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) Key idea: Match molecule and function. (a) Glycogen: storage product, (iv). (b) Gl... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Which of the following is a correct statement ? Answer: 2. Cyanobacteria are a group of autotrophic organisms classified under Kingdom Monera. Key idea: Cyanobacteria are autotrophic and b... Monera, Protista and Fungi 1 answer
Tegmina in cockroach, arises from : Answer: 3. Mesothorax Key idea: In cockroach, the forewings are tegmina and arise from the mesothorax. The hind wings (membranous) arise fro... Frog: morphology and anatomy 1 answer
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :Osteoporosis is characterised by decreased bone mass and increased chances of fractures.Reason (R) :Common cause of osteoporosis… Answer: 4. (A) is correct but (R) is not correct Key idea: Osteoporosis is linked to a fall in estrogen, not a rise. (A) is correct: osteopo... Skeletal system, joints and disorders 1 answer
Which of the following statements are true for spermatogenesis but do not hold true for Oogenesis ?(a) It results in the formation of haploid gametes(b) Differentiation of gamete occurs after the completion of meiosis(c) Meiosis occurs continuously i… Answer: 1. (b), (c) and (e) only Key idea: Compare each statement for the two processes. (a) Both give haploid gametes. Not exclusive. (b) I... Gametogenesis: spermatogenesis and oogenesis 1 answer
A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is C_6H_12O_6 then what is the formula for maltose ? Answer: 4. C₁₂H₂₂O₁₁ Key idea: A dehydration reaction removes one water molecule when two units join. 2 glucose = mathrmC₁₂H₂₄O₁₂ . Subtract... Biomolecules: proteins, carbohydrates, lipids, nucleic acids 1 answer
Breeding crops with higher levels of vitamins and minerals or higher proteins and healthier fats is called : Answer: 4. Bio-fortification Key idea: Breeding crops for higher vitamins, minerals, proteins and healthier fats is called biofortification.... Biocontrol agents and biofertilizers 1 answer
Identify the microorganism which is responsible for the production of an immunosuppressive molecule cyclosporin A : Answer: 2. Trichoderma polysporum Key idea: Cyclosporin A, an immunosuppressant used in organ transplants, is produced by the fungus Trichod... Microbes in industrial production 1 answer
Detritivores breakdown detritus into smaller particles. This process is called : Answer: 3. Fragmentation Key idea: Detritivores such as earthworms break detritus into smaller particles. This step is fragmentation. It is... Productivity and decomposition 1 answer
If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ______ individuals per Drosophila per week. Answer: 2. 0.1 Key idea: Death rate per individual = deaths ÷ population size. death rate = 8/80 = 0.1 individuals per Drosophila per week. Population attributes: growth, birth and death rate, age distribution 1 answer
In which of the following animals, digestive tract has additional chambers like crop and gizzard ? Answer: 1. Pavo, Psittacula, Corvus Key idea: Birds have a crop and a gizzard in the digestive tract. Pavo (peacock), Psittacula (parrot) an... Non-chordates up to phyla 1 answer
Given below are two statements :Statement I :The release of sperms into the seminiferous tubules is called spermiation.Statement II :Spermiogenesis is the process of formation of sperms from spermatogonia.In the light of the above statements, choose… Answer: 4. Statement I is correct but Statement II is incorrect Key idea: Spermiation and spermiogenesis are different steps. Statement I: s... Gametogenesis: spermatogenesis and oogenesis 1 answer

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