Mission Examination : आइएससी कक्षा 12वीं के छात्र BIOLOGY का माडल पेपर हल कर, आंसर की से करें मिलान

Sample Question Paper ISC

TERM 1 – 2021-22 – CLASS XII – BIOLOGY– M.M: 70 TIME:1HR30MIN

Instructions: You are provided with additional 15 Minutes for reading the paper. Select the correct option in each case. Each question\Subpart of question carries 1 mark.

Q1.The part of the core enzyme which is used to stabilize the antisense strand of DNA is

(a) Sigma Factor (b)Rho Factor

(c)cap G (d)A-tail

Q2.The basal part of ovule where nucellus, integuments and funicle merge is known as-----.

(a)Micropyle (b)Chalaza (c)Hilum (d)Tegmen

Q3.What is the last loop which is operative in RNA?

(a)DIHU site (b)3’ OH site (c)Anticodon site (d)none of these

Q4.What does HIVstand for?

(a)Human immunodeficiency virus (c)Human internal virology

(b)Heated immune deficiency viriod (d)Human immunodeficiency viriod

Q5.What kind of endosperm is found in Cocos nucifera?

(a)Cellular (b)Nuclear (c)Helobial (d)Both a and b

Q6.Which of them is not a derivative of ectoderm in humans?

(a)Nervous system (b)Enamel of teeth (c)Urinary bladder (d)Hair

Q7.In a fertilized embryo sac the haploid, diploid and triploid structures are :

(a)Antipodal, Zygote ,Primary endosperm (c)Synergid,Polar nuclei,Zygote

(b)Synergid,Antipodal,egg (d)Antipodal,Polar nuclei,Synergid

Q8.Pick up the incorrect statement humans:

(a) Oogenesis begins in embryonic stage

(b) Heart develops in the first trimester

(c)Gametes are haploid

(d)Hormones influence gamete production

Q9.In a 28 day human ovarian cycle, ovulation takes place typically on……

(a)first day of cycle (b)day 14 of cycle (c)day 5 of cycle (d)last day of cycle

Q10.Which of them has the ability to fix atmospheric nitrogen?

(a)Nostoc (b)Rhizobium (c)Azotobacter (d) All of them

Q11. The process of transformation of a circular spermatid to a spermatozoon is called……

(a)Spermiogenesis (b)Gametogenesis (c)Spermatogenesis (d)Spermiation

Q12.The primitive earth conditions created by Miller experiment included the following:

(a)Low temperature, volcanic eruptions, an oxidizing environment

(b)Low temperature,volcanic eruptions,reducing atmosphere

(c)High temperature,volcanic eruptions,atmosphere containing CH4 and NH3

Q13Whom will you associate mutation with?

(a)Antony Leewenhoek (b)Hugo De Vries (c)Darwin (d)None of them

Q14.Which of these is not an important component of initiation of parturition in humans?

(a)Release of Oxytocin (b)Release of prolactin (c)Increase in progesterone

(d)Synthesis of prostaglandins

Q15.There is no cell division involved in

(a)Spermatogenesis (b)Oogenesis (c)Emryogenesis (d)Spermiogenesis

Q16.Who reported polyembryony for the first time?

(a)Antony Van Leeuwenhoek (b)Kappert (c)P.Maheshwari (d)Haberlandt

Q17.Which of them is not correctly matched?

(a)Sertoli cells-Nurse cells (c)LH-Pituitary

(b)Acrosome-Hydrolytic enzyme (d)Spermatid-Diploid

Q18.------- is used as an immunosuppressive agent in organ-transplant patients.

(a)e-ephedrine (b)Cyclosporin-A (c)Statins (d)Steroids

Q19.Zymase is obtained from -------

(a)Saccharomyces cerevisiae (b)Streptococcus lactis

(c)Both of them (d)None of them

Q20.Which of them is correctly matched?

(a)Lady bird-Aphids (b)Dragon fly-Ballworm

(c)Agrobacterium-algal Disease (d)None of them

Q21.In which genetic condition ,each cell in the affected person has three gender chromosomesXXY?

(a)Turner Syndrome (b)Klinefelter Syndrome (c)Phenyl ketonuria (d)Down

Syndrome

Q22.If a double stranded DNA has 30% cytosine, calculate the percent of adenine in DNA.

(a)20 (b)40 (c)30 (d)60

Q23.Which of the following information transfer is catalysed by reverse transcriptase?

(a)RNA-DNA (b)DNA-RNA (c)RNA-RNA (d)DNA-DNA

Q24.Due to population crash some alleles may be lost in progeny. This may be termed as -----

(a)Founder effect (b)Bottle neck effect (c)Genetic drift (d)Migration

Q25.A hexaploid(6n)female plant is crossed with diploid(2n)male plant. What will be the

chromosome number in the endosperm of progeny?

(a)3n (b)5n (c)2n (d)7n

Q26.The-------- charged with amino acid serves as an adapter molecule to decode the

information on mRNA.

(a)mRNA (b)tRNA (c)rRNA (d)SnRNA

Q27.Which of them is not associated with menstrual flow?

(a)Female permits copulation only in this period(b)It occurs in primates

(c)sex urge is not increased (d)Endometrial lining disintegrates

Q28.In which of these techniques is sperm injected directly in ovum?

(a)ICSI (b)AI (c)IVF (d)IUT

Q29.What is the average lifespan of banana?

(a)3-4 months (b)25 years (c)15 years (d)1-2 Weeks

Q30.The male gamete of a plant has 14 chromosomes in its nucleus. How many

chromosomes will be present in its seedling ?

(a)14 (b)28 (c)42 (d)7

Q31.Bt cotton is a/an--------resistant variety of cotton.

(a)Insecticide (b)Pest (c)Insect (d)Disease

Q32.In E.Coli the lac operon gets switched on when:

(a) Lactose is present and it binds to RNA polymerase

(b)Lactose is present and it binds to repressor

(c)RNA polymerase binds to the operator

(d)Repressor binds to the operator

Q33.Which enzyme joins the small fragments of DNA of lagging strand during DNA

replication?

(a)DNA ligase (b)DNA polymerase (c)Permease (d)Primase

Q34.To initiate translation, the mRNA first binds to:

(a)the larger ribosomal subunit (b)the smaller ribosomal subunit

(c)the whole ribosome (d)no such specificity occurs

Q35.The principal tail piece of human sperm shows the microtubular arrangement of

(a)7+2 (b)9+2 (c)11+2 13+2

Q36.Acrosome in human sperm is a type of?

(a)Lysosyme (b)Flagellum (c)ribosome (d)Basal body

Q37.Which of them is hormone releasing IUD?

(a)CuT (b)Cu7 (c)Multiload375 (d)LNG20

Q38.In some members of which of the following pairs of families , pollen grains retain their viability for months after release?

(a)Poaceae, Solanaceae (b)Rosaceae,Leguminosae

(c)Poaceae,Rosaceae (d)Poaceae,Leguminosae

Q39.Arrange in a logical sequence:

(a)Zygote,tetrad,octant,globular (b)Tetrad,zygote,octant,globular

(c)Globular,zygote, octant,tetra (d)Zygote,globular,tetrad,octant

Q40.Which of the following cells during gametogenesis is normally diploid?

(a)Spermatid (b)Secondary polar body (c)Spermatogonia

(d)Primary polar body

Q41.Assertion:Capacitation enables sperm to fertilize ovum

Reason: Fertilization occurs inside oviduct

(a)Both assertion and reason are right and reason is the correct explanation of Assertion.

(b)Both are right but reason is not the correct explanation of assertion.

(c)Assertion is right, Reason is wrong

(d)Both are wrong

Q42.Assertion: The honey bee is an example of haplodiploidy

Reason: All honey bees are haploid

(a)Both assertion and reason are right and reason is the correct explanation of Assertion.

(b)Both are right but reason is not the correct explanation of assertion.

(c)Assertion is right, Reason is wrong

(d)Both are wrong

Q43.Assertion:E.Coli prefers to use lactose when it can.

Reason: Lactose needs to be hydrolysed first

(a)Both assertion and reason are right and reason is the correct explanation of Assertion.

(b)Both are right but reason is not the correct explanation of assertion.

(c)Assertion is right, Reason is wrong

(d)Both are wrong

Q44.Statement 1.Chromosome 1 in humans is the largest with maximum number of genes.

Statement 2.Dystrophin is the largest human gene.

(a) Both are true (b)1 is true but 2 is false

(c)2 is true but 1 is false (d) Both are false

Q45.Assertion:Autosomal disease is transferred from mother to only son .

Reason: Autosomes are transferred Only from mother to children

(a)Both assertion and reason are right and reason is the correct explanation of Assertion.

(b)Both are right but reason is not the correct explanation of assertion.

(c)Assertion is right, Reason is wrong

(d)Both are wrong

Q46.Study the image and answer the next five questions:

(A) What does the image show?

(a) Human Ovum (b)Fertilization

(B)What is the site of fertilization?

(a)Oviduct (b)Fimbrae (c)Ostium (d)Endometrium

(C)When an ovum fuses with sperm no other sperm can enter further.What is this referred as?

(a)Monospermy (b)Dichogamy (c) Oogamy

(d)What promotes the above?

(a)Corona Radiata (b)Vitelline membrane (c)Zona Pellucida (d)None of the

above

(e)When does ovulation begin?

(a)At puberty (b)At birth (c)During Pregnancy

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Q47.Study the image and answer the following questions:

(A) Identify the structure: (

(a)Blastocyst (b)Morula (c)Gastrula (d)None

(B).Identify ‘a’.

(a)Trophoblast (b)Inner cell mass

(C)Where does the picture shown in the image get implanted?

(a)Fallopian Tube (b)Ovarian Wall (c)Endometrium of Uterus

(D).Implantation occurs after ------- of fertilization.

(a)7 days (b)immediately after fertilization (c)One month after fertilization

(d)After first trimester

(E).Name the stage preceeding the one shown.

(a)Morula (b)Blastula (c)Gastrula

Q48.Study the image and answer the questions that follow:

(A)Identify it:

(a)Sperm (b)Spermatid

(B).How many chromosomes are present in it?

(a)22 (b)23 (c)44 (d)46

(C).State the full form of ADAm

(a)Androgen deficiency in ageing males (b)Adrenal deficiency in ageing males

(c)Adrenaline disorder in ageing male (d)Androgen disorder in ageing males

(D).The given figure fuses with the egg in the --------.

(a)Uterus (b)Ovary (c)Oviduct (d)Vagina

(E)The -------- is made up of mucopolyssacharide and acid phosphatase.

(a)end piece (b)acrosome (c)tail (d)neck

Q49. Read the passage and answer the questions:

Biologically active products or microbial inoculants of bacteria , algae or fungi

separately or in combination help in nitrogen fixing in various crops.

(A) What do you call such organisms that enrich the nutrient quality of soil?

(a)Bioferilizer (b)Biopesticide (c)Manure (d)microbial fertilizer

(B)A symbiotic relationship between roots of higher plant and fungal hyphae is called---.

(a)Lichen (b)Mycorrhiza (c)VAM

(C).Who coined the above term?

(a)Frank (b)Leewenhoek (c)Maheshwari

(D).What role does the fungal partner play in the above relationship?

(a)Prepares food (b)Absorbs nutrients

(E).Which of them does not come in category of VAM?

(a)Glomus (b) Sclerocystis (c)Entrophosphora (d)All are VAM

Q50.Read the passage and answer the questions that follow:

A lab technician wants to develop 200 grains of wheat. He knows that cell

division is an essential process for it.

(A)What kind of cells are microspore mother cells?

(a)Haploid (b)Diploid

(B).The microspore mother cells undergo -------- to produce microspores.

(a)Mitosis (b)Meiosis

(C).How many microspores are produced from one mother cell?

(a)1 (b)2 (c)3 (d) 4

(D).How many functional megaspores are produced from one mother spore cell?

(a)1 (b)2 (c)3 (d)4

(E).How may total meiosis will be required for producing 200 grains?

(a)250 (b)125 (c)100 (d)200