Biology
Biology HSC Maharastra Board Multiple Choice Questions With Answers
1) The outer layer of pollen grain is thick and made up of complex, non - biodegradable substance called as _______.
A) LigninB) CelluloseC) PectinD) Sporopollenin
Ans : Sporopollenin
2) Sporoderm is made up of ______.
A) Exosporium and endosporiumB) Outer integuments and inner integumentC) Testa and tegmenD) Exine and intine
Ans : Exine and intine
3) The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.
A) 1 meiosis and 2 mitosisB) 1 mitosis and 3 meiosisC) 1 meiosis and 1 mitosisD) 1 meiosis and 3 mitosis.
Ans : 1 meiosis and 3 mitosis.
4) Identify the odd one with respect to pollinating agent.
A) BaobabB) Bottle brushC) KadambD) Sausage
Ans : Bottle brush
5) In vitro pollen germination and pollen tube elongation can be induced by ______.
A) Boric acidB) GlucoseC) LactoseD) Sucrose
Ans : Sucrose
6) Self-incompatibility is found in flowers of plants _______.
A) CalotropisB) MaizeC) TheaD) Gloriosa
Ans : Thea
7) Porogamy refers to entry of pollen tube through ____________.
A) IntegumentsB) ChalazaC) MicropyleD) Stigma
Ans : Micropyle
8) ______ is an example of helobial endosperm.
A) AdoxaB) CoconutC) AsphodelusD) Sunflower
Ans : Asphodelus
9) The single shield-shaped cotyledon in monocot seed is known as ______.
A) ColeoptileB) ScutellumC) Aleurone layerD) Perisperm
Ans : Scutellum
10) The example of dicot endospermic seed is ______.
A) CastorB) PeaC) MangoD) Bean
Ans : Castor
11) The primary sex organ in human male is _______.
A) Prostate glandB) Seminal vesicleC) PenisD) Testis
Ans : Testis
12) Seminal fluid is ______ in nature.
A) AcidicB) NeutralC) SugaryD) Alkaline
Ans : Alkaline
13) Which of the following is not a part of the uterus?
A) BodyB) CervixC) FundusD) Cornua
Ans : Cornua
14) Meanrch, menstrual cycle, and menopause are controlled by ______.
A) Thyrotropic hormoneB) Gonadotropic hormoneC) Somatotropic hormoneD) Corticotropin
Ans : Gonadotropic hormone
15) Nebenkern is ______.
A) Acrosome of spermB) Neck of spermC) Middle piece of spermD) Mitochondrion of sperm
Ans : Mitochondrion of sperm
16) Nervous system develops from ______ of embryonic layer.
A) EndodermB) ChorionC) EctodermD) Mesoderm
Ans : Ectoderm
17) The average period of pregnancy in human lasts for ______ days of pregnancy.
A) 280B) 270C) 266D) 290
Ans : 280
18) ______ is not a permanent method of birth control.
A) VasectomyB) TubectomyC) WithdrawalD) Castration
Ans : Withdrawal
19) The organism which causes Gonorrhoea is ______.
A) TrepenomaB) NeisseriaC) EntamoeabaD) Salmonella
Ans : Neisseria
20) How many pairs of testis are present in human male?
A) 2 pairs
B) 1 pairC) Only one testisD) Only one ovary
Ans : 1 pair
21) The three principles of Mendelism are
A) Dominance, segregation, and independent assortmentB) Linkage, segregation, and independent assortmentC) Linkage, dominance, and segregationD) Linkage, dominance, and Independent assortment.
Ans : Dominance, segregation, and independent assortment
22) Which one of the following is back cross?
A) F1 × F1B) F1 × Recessive parentC) F1 × Dominant parentD) F1 × Any parent
Ans : F1 × Any parent
23) RR (Red) Antirrhinum is crossed with white (rr) one. Offspring (Rr) are pink. This is an example of ______.
A) Dominant -recessiveB) Incomplete dominanceC) HybridD) Supplementary genes
Ans : Incomplete dominance
24) The word chromosome was coined by
A) BendaB) WaldeyerC) Robert HookeD) T.H.Morgan
Ans : Waldeyer
25) Nullisomy is represented by ______.
A) (2n-1)B) (2n-2)C) (2n+1)D) (2n+2)
Ans : (2n-2)
26) Identify the odd one:-
A) MonoploidyB) DiploidyC) PolyploidyD) Hyperploidy
Ans : Hyperploidy
27) In humans, the sex chromosome complement is
A) XX-XYB) XX-XOC) ZZ-ZOD) ZW-ZZ
Ans : XX-XY
28) A family has five daughters and expecting sixth child. The chance of its beings a son is
A) ZeroB) 25%C) 50%D) 100%
Ans : 50%
29) In human beings 45 chromosomes/single X/XO abnormality causes ______.
A) Down's syndromeB) Klinfelter's syndromeC) Turner's syndromeD) Edward's syndrome
Ans : Turner's syndrome
30) Webbed neck is characteristic of ______ syndrome.
A) XXXB) YYC) XXYD) XO
Ans : XO
31) Find the odd one out:
A) H2AB) H3C) H2BD) H1
Ans : H1
32) What happened when heat-killed S-cells along with living R-cells were injected into mice?
A) Mice died and showed live S-cellsB) Mice survived and showed live S-cellsC) Mice died and showed live R-cellsD) Mice died and showed dead R-cells
Ans : Mice died and showed live S-cells
33) Find out the double ring compound.
A) AdenineB) UracilC) CytosineD) Thymine
Ans : Adenin
34) If a DNA has 20 Adenine and 30 cytosine bases. What will be the total number of purine bases in the given sample?
A) 20B) 50C) 30D) 100
Ans : 50
35) Semiconservative mechanism of DNA was detected using:
A) 35SB) 14CC) 32PD) 15N
Ans : 15N
36) A template strand of DNA has the base sequence CATGATTAC. New strand synthesized on it will be:
A) GATCAUATGB) GTACTAACGC) GAACTAATGD) GTACTAATG
Ans : GTACTAATG
37) During DNA replication, the separated strands of DNA are prevented from recoiling by
A) DNA primaseB) Sigma factorC) Rho-factorD) SSBP
Ans : SSBP
38) In which of the following synthesis of DNA strand is not involved directly?
A) MRNAB) TRNAC) Another DNA strandD) Protein
Ans : Protein
39) Wobble hypothesis is related with
A) Ambiguity in codonB) Purine pyrimidine equalityC) Genetic code is tripletD) Degeneracy of genetic code and economy of tRNA molecules in the cell
Ans : Degeneracy of genetic code and economy of tRNA molecules in the cell
40) During elongation of polypeptide chain, sigma factor is
A) FunctionlessB) Retained for specific functionC) Released for re-useD) Required during closing of chain
Ans : Functionless
41) Enzyme required for peptide formation is
A) PeptidaseB) Peptidyl transferaseC) NitrogenaseD) Nitrate reductase
Ans : Peptidyl transferase
42) Exon segments are reunited after splicing by
A) RNA primaseB) RNA proteaseC) RNA polymeraseD) RNA ligase
Ans : RNA polymerase
43) In lac operon, lactose acts as:
A) InducerB) Co-inducerC) RepressorD) Co-repressor
Ans : Inducer
44) A unit of lac-operon which in the absence of lactose, suppresses the activity of operator gene is
A) Structural geneB) Regulatory geneC) Repressor proteinD) Promoter gene
Ans : Regulatory gene
45) _______ is considered as connecting link between ape and man.
A) AustralopithecusB) Homo habilisC) Homo erectusD) Neanderthal man
Ans : Australopithecus
46) Humans are most closely related to ______.
A) MarsupialB) LemurC) ChimpanzeesD) Tarsier
Ans : Chimpanzees
47) The proportion of an allele in the gene pool to the total number of alleles at a given locus is called _______.
A) Gene poolB) Gene frequencyC) Gene flowD) Genetic drift
Ans : Gene frequency
48) Transfer of a part of chromosome or set of genes to a non-homologous chromosome is called ________.
A) Deletion
B) DuplicationC) InversionD) Translocation
Ans : Translocation
49) Any random fluctuation in allele frequency, occurring in the natural population by pure chance is called __________.
A) Gene poolB) Gene mutationC) Genetic recombinationD) Genetic drift
Ans : Genetic drift
50) Water present in the form of hydrated oxides of Silicon, Aluminium is called ______.
A) Hygroscopic WaterB) Gravitational WaterC) Combined WaterD) Capillary Water
Ans : Combined Water