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Botany 27

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Each gene occupies a point on a chromosome called

  1. Chiasma

  2. Cistron

  3. Locus

  4. Position effect


Correct Option: C

The plant hormones used in tissue culture method to induce the formation of shoot and root

  1. Gibberellins and Auxins

  2. Cytokninin and Gibberellins

  3. Auxin and cytokinin

  4. Ethylene and cytokinin


Correct Option: C

The experiments of ______ proved that the genetic material of TMV is RNA.

  1. Fraenkel-Conrat

  2. Singer

  3. Both (1) and (2)

  4. Sinnot


Correct Option: C

The process of transferring plantelets developed during tissue culture to pots and subjected gradually to natural environmental conditions is called

  1. Hardening

  2. Cloning

  3. Splicing

  4. Gene manipulation


Correct Option: A

_________ can change the dihybrid ration in F2 generation.

  1. Somatic mutation

  2. Germinal mutation

  3. Spontaneous mutation

  4. Induced mutations


Correct Option: B

In a DNA, there are ______ weak bond(s) between adenine and thymine and _____ weak bond(s) between guanine and cytosine.

  1. 2; 3

  2. 3; 2

  3. 1; 2

  4. 2; 1


Correct Option: A

A valuable tool for plant breeding and improvement of crop plants

  1. Tissue culture

  2. Linkage

  3. Hybridisation

  4. Physiology


Correct Option: C
Explanation:

A valuable tool for plant breeding and improvement of crop plants is hybridisation.

Which of the following is a genetic material?

  1. tRNA

  2. mRNA

  3. rRNA

  4. gRNA


Correct Option: D

The common name for Mirabilits jalapa is

  1. Snapdragon

  2. Traveller's palm

  3. 4'O clock plant

  4. Shoe-flower


Correct Option: C

DNA is a __________ nucleotide.

  1. mono

  2. di

  3. tri

  4. poly


Correct Option: D

Ribosomes are made up of

  1. DNA and lipid

  2. RNA and protein

  3. RNA and lipid

  4. DNA and protein


Correct Option: B

Mutations which occur in nature are called

  1. Lethal mutations

  2. Chromosomal mutations

  3. Point mutations

  4. Spontaneous mutations


Correct Option: D

An example of incomplete dominance is

  1. 4'O clock plant

  2. Wheat

  3. Pea plant

  4. Cicer plant


Correct Option: A

___________ is an example of incomplete dominance.

  1. Mirabilis jalapa

  2. Pisum sativum

  3. Mangifera indica

  4. Aloe vera


Correct Option: A

tRNA molecule model is ______ in shape.

  1. single strand

  2. double helix

  3. clover leaf

  4. triangular


Correct Option: C

_____ forms 3 to 5% of the non-genetic RNA.

  1. mRNA

  2. rRNA

  3. gRNA

  4. none of these


Correct Option: A

A large seeded mutant variety of Bengal gram

  1. Arachis hypogea

  2. Cicer arietinum

  3. Cicer gigas

  4. Cupid


Correct Option: C
Explanation:

A large seeded mutant variety of Bengal gram is Cicer arietinum.

A dwarf variety of sweet pea

  1. Cupid

  2. Alae

  3. Cistron

  4. Cicer gigas


Correct Option: A

Virus free potatoes, tulips, sugarcanes, orchids etc. have been produced with the help of a technique

  1. Genetic engineering

  2. Biotechnology

  3. Tissue culture

  4. Protoplasmic fusion


Correct Option: C

X-rays , UV rays, mustard gas, nitrous acid, formaldehyde can induce

  1. Crossing over

  2. Polyploidy

  3. Linkage

  4. Mutation


Correct Option: D

MacLeod and McCarthy identified the main substance of transformation in bacteria as

  1. RNA

  2. DNA

  3. Plasmid

  4. Cytoplasm


Correct Option: B

The prokaryote used as host in genetic engineering technique

  1. HIV

  2. TMV

  3. Bacillus subtilis

  4. Bacteriophage


Correct Option: C

_________ ratio of Bateson and Punnett in Lathyrus odoratus does not confirm to the law of independent assortment.

  1. 7 : 1 : 1 : 7

  2. 12 : 3 : 1

  3. 1 : 1 : 1 : 1

  4. 9 : 3 : 4


Correct Option: A

The ratio of complementary genes and the ratio of epistasis are

  1. same as Mendel's dihybrid ratio, since they obey Mendel's second law of independent assortment

  2. different from Mendel's dihybrid ratio, since they do not obey Mendel's second law of independent assortment

  3. same as Mendel's dihybrid ratio, since they do not obey Mendel's second law of independent assortment

  4. different from Mendel's dihybrid ratio, but they obey Mendel's second law of independent assortment


Correct Option: D

Species differentiation and production of different varieties in many plants are brought about by

  1. the chromosomes that have a region represented twice

  2. the placement of the genes in the reverse order of the normal order in a segment of a chromosome

  3. the reduction in the number of genes in a particular chromosomes

  4. interchange of chromosome segments between non-homologous chromosomes


Correct Option: D

Diplococus pneumoniae causes

  1. Kala-azar

  2. Filaria

  3. Malaria

  4. Pneumonia


Correct Option: D

Griffith effect is also known as bacterial

  1. coupling

  2. transformation

  3. effect

  4. studies


Correct Option: B
Explanation:

Griffith effect is also known as bacterial transformation. Transformation is the genetic alteration of a cell resulting from the direct uptake and incorporation of exogenous genetic material (exogenous DNA) from its surroundings and taken up through the cell membrane.

The monohybrid and dihybrid crosses performed by Mendel lead to a monohybrid phenotype ratio, a genotype ratio and a dihybrid phenotype ratio, respectively, of

  1. 3:1 ; 1:2:1 ; 9:3:3:1

  2. 1:2:1 ; 3:1 ; 9:3:3:1

  3. 3:1 ; 1:2:1 ; 1:7:7:1

  4. 1:3 ; 1:1:1;:1 ;12:3:1


Correct Option: A

In the inheritance of complementary genes in sweet pea, the plants having the genotype CcPp produce flowers of

  1. white colour due to the pigment chromogen

  2. white colour due to the pigment xanthophyll

  3. purple colour due to the pigment anthocyanin

  4. purple colour due to the pigment fucoxanthin


Correct Option: C

The number of chromosomes in a somatic cell of Pisum satiaum is

  1. 14

  2. 16

  3. 7

  4. 12


Correct Option: A

Which one of the following is a genetically significant mutation?

  1. Somatic mutation

  2. Translocation mutation

  3. Substitution mutation

  4. Inversion


Correct Option: C

Directions: Following question consists of two statements, one labeled as 'Assertion A' and the other labeled as 'Reason R'. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation for Assertion. Select your answer from the codes given below.

A: If pollen of tall plant is transferred to the stigma of dwarf plant or pollen of dwarf plant is transferred to the stigma of tall plant, the F1 progeny were all tall

B: The sex of the plants have no influence over the inheritance of the characters R : The sex of the parents have no influence over the inheritance of the characters

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)

  2. Both (A) and (R) are true and (R) is not the correct explanation of (A)

  3. (A) is true, but (R) is false

  4. (A) is false, but (R) is true


Correct Option: A

Directions: Following question consists of two statements, one labeled as 'Assertion A' and the other labeled as 'Reason R'. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation for Assertion. Select your answer from the codes given below.

A : A recessive trait expresses only in homozygous condition R : The allels will segregate at the time of gamete formation

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)

  2. Both (A) and (R) are true and (R) is not the correct explanation of (A)

  3. (A) is true, but (R) is false

  4. (A) is false, but (R) is true


Correct Option: B

A cross between a hybrid and a ressive parent, and a cross between a hybrid and a pure breeding parent are known as

  1. monohybrid crosses

  2. test cross and back cross respectively

  3. dihybrid cross and back cross respectively

  4. back cross and test cross respectively


Correct Option: B
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