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C:\Users\Dtpuser\Desktop\Board 9820874556/ 9619947441 www.calibrantclasses.in www.calibrantclasses.in HSC 2019 BIOLOGY SOLUTION SECTION - A Q. 1 As the base sequence present on one strand of.DNA decides the base sequence of other strand, this [8] strand is considered as . (1) (a) Descending strand (b) Leading strand (c) Lagging strand (d) Complimentary strand Ans. (d) Complimentary strand Refer GTB Pg. No. 22 Topic: Gene: It’s nature expression and regulation; Sub-topic:Stucture of DNA_L-1_XII-HSC Board Test Biology Q. 2 shows haplo-diploid type of sex-determination. (1) (a) Pigeon (b) Honey bee (c) Parrot (d) Snake Ans. (b) Honey bee Refer GTB Pg. No. 147 Topic: Chromosonal Basis of inheritance; Sub-topic:Mechanism of Sex determination_L-1_XII-HSC Board Test Biology Q. 3 Membrane bound receptors and hormones produce second messengers like . (1) (a) Renin (b) IP3 (c) ANF (d) GHRF Ans. (b) IP3 Refer GTB Pg. No. 219 Topic: Control & coordination_; Sub-topic:Mechanism of hormone action_L-1_XII-HSC Board Test Biology Q. 4 During double fertilization second male gamete fuses with . (1) (a) antipodal cell (b) egg cell (c) secondary nucleus (d) synergids Ans. (c) secondary nucleus Refer GTB Pg. No. 101 Topic: Reproduction in plants; Sub-topic:Double fertilization_L-1_XII-HSC Board Test Biology Corporate & Registered Office: Unit No.3, 1st Floor, Alankar CHS, Nadco Shopping Complex, Andheri – (West), Mumbai – 400058 9820874556/ 9619947441 www.calibrantclasses.in www.calibrantclasses.in Q. 5 What is Sinus arrhythmias? (1) Ans. Sinus arrhythmias : During inspiration heart rate increases and during expirations it falls. This phenomenon is known as sinus arrhythmia. Refer GTB Pg. No. 185 Topic: Circulation; Sub-topic:Regulation of cardiac activity _L-1_XII-HSC Board Test Biology Q. 6 By which process ammonia is converted into urea in liver? (1) Ans. In orinithine cycle is the pathway in which ammonia is coverted into urea in liver. Refer GTB Pg. No. 192 Topic: Excretion and Osmoregulation; Sub-topic:Ureotelism_L-1_XII-HSC Board Test Biology Q. 7 Give the role of Plasmids in bacterial cell. (1) Ans. Role of plasmids in bacterial cell: Plasmids in bacteria carry genes related to metabolic activity and allowing the carrier bacterium to survive and reproduce under unfavorable condition. Refer GTB Pg. No. 37 Topic: Biotechnology: Process and application; Sub-topic:Transponsons, Plamids and bacteriophages_L- 1_XII-HSC Board Test Biology Q. 8 A person is showing symptoms like increased BMR, heart rate, pulse rate, blood pressure and deposition of fats in eye sockets. Name the disease he is suffering from. (1) Ans. A person is suffering from Exopthalmic goiter or Grave’s disease. Refer GTB Pg. No. 216 Topic: Control & co-ordination; Sub-topic:Function and thyroxine_L-1_XII-HSC Board Test Biology SECTION – B Q.9 Define apiculture. Name the products obtained from it. (2) [20] Ans. Definition: Apiculture or bee keeping deals with artificial rearing of honey bees to obtain bee products. Bee products like honey, wax, pollen, bee venom and royal Jelly as well as for crop pollination. Refer GTB Pg. No. 192 Topic: Animal Husbandry; Sub-topic:Bee Keeping_L-1_XII-HSC Board Test Biology Corporate & Registered Office: Unit No.3, 1st Floor, Alankar CHS, Nadco Shopping Complex, Andheri – (West), Mumbai – 400058 9820874556/ 9619947441 www.calibrantclasses.in www.calibrantclasses.in Q.10 Define biofertilizers. Give two types of fungal biofertilizers. (2) Ans. Definition: The biofertilizers are mostly nitrogen-fixing microbes which enrich soil with nutrients. Mycorrhiza is a fungus. It forms symbiotic association with the roots of higher plants. There are two types ; Ectomycorrhiza, Endomycorrhiza. Refer GTB Pg. No. 59 Topic: Microbes in Human Welfare; Sub-topic:Microbes in Biofertilizers_L-1_XII-HSC Board est Q.11 Give the types of blood proteins and human hormone’s produced by recombinant DNA-technique. (2) Ans. Blood proteins: Erythropoietin; Factors VII, VIII, IX; Tissue plasminogen activator; Urokinase. Human Hormones: Epidermal growth factor; Follicle stimulating hormone; Insulin. Refer GTB Pg. No. 37 Topic: Biotechnology: Process & Application; Sub-topic:Recombinant DNA Technology_L-1_XII-HSC Board Test Biology Q.12 Write any two scientific and commercial values of transgenic animals in favour of human being. (2) Ans. Study of diseases: Many transgenic animals are designed to study how genes contribute to the development of disease. Vaccine safety: Transgenic mice are being used to test the safety of polio-vaccine. Bioreacters: Transgenic animals would also be useful as bioreactors to produce pharmacologically important proteins such as alpha – 1 – antitrypsin. Chemical safety testing: Transgenic animals carry genes which make them more sensitive to toxic substances than non-transgenic animals. Refer GTB Pg. No. 155 Topic: Genetic Engineering & Genomics_; Sub-topic:Transgenic Animals_L-1_XII-HSC Board Test Biology Q.13 Define ‘Respiratory Quotient’ (RQ) and calculate the Respiratory Quotient for Carbohydrate. (2) Ans. The ratio of volume of CO2 evolved to the volume of O2 consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio. When carbohydrates are used as respiratory substrate and are completely oxidized, the RQ is 1, because volume of CO2 evolved is equal to volume of O2 consumed, as shown in the equation. C6H12O6 + 6O2 ⎯ ⎯→ 6CO2 + 6H 2O + Energy 6CO RQ = 2 = 1.0 6O2 Refer GTB Pg. No. 87 Topic: Respiration; Sub-topic:Respiratory Quotient_L-1_XII-HSC Board Test Biology Corporate & Registered Office: Unit No.3, 1st Floor, Alankar CHS, Nadco Shopping Complex, Andheri – (West), Mumbai – 400058 9820874556/ 9619947441 www.calibrantclasses.in www.calibrantclasses.in Q.14 Light and dark reactions are interdependent Explain. (2) Ans. Interdependence of light and dark reaction: The two phases of photosynthesis, i.e. light and dark reactions are interdependent. The products of light reaction, i.e. ATP & NADPH2 (assimilatory power) are required for dark reaction i.e. for reduction of CO2 into glucose. During dark phase, ADP, iP, & NADP get regenerated, and are required for the synthesis of ATP & NADPH2 during light reaction. Thus the two are interdependent. The dark reactions also take place during day. Refer GTB Pg. No. 74 Topic: Photosynthesis; Sub-topic:Interdependence of Light and Dark Reaction_L-1_XII-HSC Board Test Biology Q.15 Classify the chromosomes on the basis of position of centromere. (2) Ans. Types of Chromosomes: According to the position of the centromere, chromosomes are classified into following types - Metacentric: If the centromere is situated in the middle of the chromosomes it is called metacentric chromosomes. Sub-metacentric: If the centromere is situated some distance away from the middle it is called sub- metacentric chromosomes. Acrocentric: If the centromere is situated near the end of the chromosomes it is called acrocentric chromosome. Telocentric: If the centromere is situated at the tip of the chromosome it is called telocentric chromosome. Refer GTB Pg. No. 142 Topic: Chromosomal Basis of Inheritance; Sub-topic:Types of Chromosomes_L-1_XII-HSC Board Test Biology Corporate & Registered Office: Unit No.3, 1st Floor, Alankar CHS, Nadco Shopping Complex, Andheri – (West), Mumbai – 400058 9820874556/ 9619947441 www.calibrantclasses.in www.calibrantclasses.in Q.16 Sketch and label structure of male gametophyte in angiosperm. What is Siphonogamy? (2) Ans. Definition: The fertilization process in which non motile male gamete are transported up to the female gamete through a pollen tube is called Siphonogamy. Refer GTB Pg. No. 95 Topic: Reproduction In Plants; Sub-topic:Development of Male Gametophyte_L-1_XII-HSC Board Test Biology Q.17 Match the following and rewrite: (2) Group ‘A’ Group ‘B’ (a) Diethylc Carbamacine (1) AIDS (b) Widal test (2) Pneumonia (c) Albendazole (3) Filariasis (d) HAART (4) Typhoid (5) Ascariasis Ans. (a) Diethylc Carbamacine (3) Filariasis (b) Widal test (4) Typhoid (c) Albendazole (5) Ascariasis (d) HAART (1) AIDS Refer GTB Pg. No. 161 to 168 Topic: Health and Disease; Sub-topic:Pathogens and Parasites_L-3_XII-HSC Board Test Biology 4 Corporate & Registered Office: Unit No.3, 1st Floor, Alankar CHS, Nadco Shopping Complex, Andheri – (West), Mumbai – 400058 9820874556/ 9619947441 www.calibrantclasses.in www.calibrantclasses.in Q.18 Complete the following chart and rewrite. (2) Sr. No. Agencies Type of Pollination 1. Water ………………… 2. ………………… Entomophily 3. Bat ………………… 4. ………………… Ornithophily Ans. 1. Water Hydrophily 2. Insect Entomophily 3. Bat Chiropterophily 4. Birds Ornithophily Refer GTB Pg. No. 99 Topic: Reproduction in Plants; Sub-topic:Agencies of pollination_L-2_XII-HSC Board Test Biology OR Q.18 Explain outbreeding devices in angiospermic plants. Ans. 1) Most of the Angiosperms produce bisexual flowers. Cross pollination is preferred by majority of flowering plants and they develop out breeding devices. 2) In many plants self-pollination is avoided as stamens and carpels do not mature simultaneously. This is called dichogamy. 3) In some plants, pollen grains are released much before stigma becomes receptive, this is protandry e.g. Sunflower and in some plants, stigma becomes receptive first, this is protogyny e.g. Michelia. 4) The third device to avoid self pollination is genetic mechanism and it is called self-incapability or self-sterility, e.g. Orchids. 5) Pollen germination on the stigma of the same flower is inhibited. The fourth device is to produce unisexual flowers. i.e. unisexuality. 6) In
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