12th Biology Model Question 2024 (Part -1)
1- In which of the following plants adventitious buds develop from leaves?
- (A) Ginger
- (B) Banana
- (C) Dahlia
- (D) Bryophyllum
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2 - In which of the following organism meiosis does not occur during gamete formation ?
- (A) Haploid organism
- (B) Diploid organism
- (C) Human
- (D) Chimpanzee
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3- Which of the following statements is incorrect ?
- (A) Ovules develop into seeds after fertilization
- (B) Reptiles and birds are oviparous
- (C) Earthworm is monoecious
- (D) Gemmule formation occurs in Hydra
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4-In seeds of pepper, remnant of nucellus persists, which is called as --.
- (A) Chalazosperm
- (B) Endosperm
- (C) Pseudo embryo sac
- (D) Perisperm
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5-After fertilization, wall of ovary develops into which structure ?
- (A) Epicarp
- (B) Seed
- (C) Mesocarp
- (D) Pericarp
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6-If production of seeds occurs without fertilization, it is called as ---- .
- (A) Amphimixis
- (B) Apomixis
- (C) Parthenocarpy
- (D) Parthenogenesis
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7-Pollen grains are well preserved as fossils because ---.
- (A) Pollen grain has a wall
- (B) Wall has exine of sporopollenin
- (C) Wall has intine of pectocellulose
- (D) Wall has cellulose
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8-Which of the following cells is not haploid ?
- (A) Spermatogonia
- (B) Spermatid
- (C) Secondary spermatocyte
- (D) Spermatozoon
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9-Which of the following secretes gonadotropin releasing hormone ?
- (A) Ovary
- (B) Testis
- (C) Posterior pituitary gland
- (D) Hypothalamus
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10-Ovulation occurs after which of the following process ?
- (A) After secretion of GnRH
- (B) Feedback inhibition
- (C) LH surge
- (D) After secretion of progesterone
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11-Normally the first movement of foetus is observed in which month of pregnancy ?
- (A) Third
- (B) Fourth
- (C) Fifth
- (D) Second
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12-Which of the following methods is used to prevent pregnancy permanently in male ?
- (A) Vasectomy
- (B) Tubectomy
- (C) Sterilisation
- (D) Medical termination of pregnancy
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13-Which of the following sexually transmitted diseases is completely curable ?
- (A) Hepatitis - B
- (B) AIDS
- (C) Genital Herpes
- (D) Syphilis
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14-Transfer of either zygote or early embryo to fallopian tube is called as……….
- (A) IVF
- (B) ET
- (C) ZIFT
- (D) IUT
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15-Which one is Genotypic ratio of F2 generation of monohybrid cross conducted by Mendel ?
- (A) 3 : 1
- (B) 1 : 2 : 1
- (C) 9 : 3 : 3 : 1
- (D) 1 : 1
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16-Which of following statements is incorrect about phenylketonuria ?
- (A) Inborn error of metabolism
- (B) Autosomal recessive trait
- (C) High level of phenylalanine and phenylpyruvate
- (D) Phenylalanine and phenylpyrurate are not excreted by kidney.
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17-According to Mendel, something is stably passed down unchanged from parent to offspring through the gametes, which was referred as -
- (A) Factor
- (B) Gene
- (C) Allele
- (D) Cistron
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18-In which of the following XO – Male type of sex determination is observed ?
- (A) Grasshopper
- (B) Honey bee
- (C) Human
- (D) Birds
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19-Backbone of polynucleotide chains of DNA is composed of which of the following ?
- (A) Sugar-phosphate-base
- (B) Phosphate-base
- (C) Sugar-phosphate
- (D) Stack of paired bases
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20-Who propounded Central Dogma ?
- (A) Watson
- (B) Crick
- (C) Wilkins
- (D) R. Franklin
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21-Which of the following statements, is not true about protein present in nucleosome ?
- (A) Non-histone
- (B) Histone
- (C) Basic protein
- (D) Positively charged protein
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22-Biochemical nature of transforming principle, was determined by
- (A) Griffith
- (B) Lederberg and Tatum
- (C) Avery, Mac Leod and Mc Carty
- (D) Hershey and Chase
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23-Which of the following statements about RNA is incorrect ?
- (A) RNA has one polynucleotide strand
- (B) Uracil present in RNA
- (C) RNA is genetic material in TMV.
- (D) Presence of 2’OH in every nucleotide of RNA imparts stability to RNA
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24-One of strands of DNA is discontinuously replicated and these fragments are joined by which of the following ?
- (A) DNA polymerase
- (B) DNA ligase
- (C) Primase
- (D) RNA polymerase
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25-RNA polymerase III is not responsible for synthesis of which of the following ?
- (A) hn RNA
- (B) t RNA
- (C) 5 sr RNA
- (D) sn RNA
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26-In Lac operon where does repressor protein bind ?
- (A) Operator
- (B) Promoter
- (C) Structural gene
- (D) Regulator gene
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27-Homologous structures show what type of evolution ?
- (A) Divergent
- (B) Convergent
- (C) Parallel
- (D) Saltatory
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28-Which of the following causes change in allele frequency in a population ?
- (A) Mutation
- (B) Gene flow
- (C) Genetic drift
- (D) All of the above
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29-Which of the following is an initiation codon ?
- (A) AUG
- (B) UUU
- (C) UAG
- (D) UGA
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30-Which of the following diseases is caused by bacteria ?
- (A) Typhoid
- (B) Malaria
- (C) Corona
- (D) Ringworms
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31-Which of the following RNA is precursor of messenger RNA ?
- (A) sn RNA
- (B) 5 sr RNA
- (C) Heterogenous nuclear RNA
- (D) r RNA
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32-Which of the following cell does not phagocytose pathogens ?
- (A) Macrophages
- (B) Neutrophils
- (C) Monocytes
- (D) RBC
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33-Which of the following is incorrect statement about antibody ?
- (A) Four polypeptide chains are present in antibody molecule.
- (B) There are two short and two long chains in antibody molecule
- (C) Antigen binding site is present in heavy chain of antibody molecule.
- (D) Antibody molecules are syntehsized in humoral immunity.
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34-Which of the following plant is the source of morphine ?
- (A) Nicotiana tobaccum
- (B) Papaver somniferum
- (C) Datura metel
- (D) Erythroxylum coca
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35-Sporozoite is the infective stage of which of the following diseases ?
- (A) Malaria
- (B) Typhoid
- (C) AIDS
- (D) Pneumonia
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