R4RIN – MCQs, Mock Tests | Agriculture Agriculture Agriculture Genetics Plant Breeding and Biotechnology

_______estimated that incompatibility occurs in more than 3000 species among 20 families of the flowering plants:

1. D. De Winton
2. M.B. Hughes
3. W.H. Gabelman
4. E.M. East

✅ Correct Answer: 4

_______provides the best documented example of long time effects of selection:

1. Sugarcane
2. Sweet sorghum
3. Sugarbeet
4. Sugar maple

✅ Correct Answer: 3

______ deteriorates drastically upon inbreeding:

1. Carrot
2. Okara
3. Brinjal
4. Broccoli

✅ Correct Answer: 1

_____ in Ladino clover is governed by two dominant alleles one produces cyanogenic glycoside while the other releases the enzyme to catalyze its release from gloycoside:

1. Oxalic acid
2. IAA
3. HCN
4. NAA

✅ Correct Answer: 3

______ are examples of protandrous species:

1. Avocados
2. Walnuts
3. Carrots
4. None of these

✅ Correct Answer: 2

Experiments in Plant Hybridization a paper of G. Mendal was first published in the year:

1. 1905
2. 1787
3. 1866
4. 1896

✅ Correct Answer: 3

If a gene is represented in an infinitely large random-mating population by adaptively neutral alleles A and a in the ration of qA: (1-q)2 aa = 1 is known as:

1. Stanford-Suneson law
2. Weibe-Thomas law
3. Briggs-Harlan law
4. Hard-Weinberg law

✅ Correct Answer: 4

2n - 1 is a:

1. Monosomic
2. Transonic
3. Tetrasomic
4. Alloploid

✅ Correct Answer: 1

2n denotes:

1. Number of homozygote produces by selfing a F1
2. Number of types of gametes produced by F1
3. Number of types of heterozygote produced by selling F1
4. None of the above

✅ Correct Answer: 2

A cell or an organism having one chromosome pair in addition to the normal somatic compliment of the species is:

1. Monosomic
2. Nullisomic
3. Tetrasomic
4. Trisomic

✅ Correct Answer: 3

A character dermined by many genes and does not show discrete variation is known as:

1. Qualitative character
2. Oligogenic character
3. Quantitative character
4. Multiple-allelic character

✅ Correct Answer: 1

A complex of communities of plants and animals of a region existing under identical climatic conditions is called as:

1. Biome
2. Ecosystem
3. Ecological complex
4. Environment

✅ Correct Answer: 1

A condition in which pollination and fertilization take place in an unopened flower is termed as:

1. Homogamy
2. Apogamy
3. Polygamy
4. Cleistogamy

✅ Correct Answer: 4

A criss-cross inheritance is shown by:

1. Sex-influenced character
2. Polygamy
3. Sex-linked character
4. Sex-quantitative character

✅ Correct Answer: 3

A cybrid is:

1. A sex hybrid
2. A hybrid formed by cell fusion
3. A plant produced by cell culture
4. Synonym to hybrid

✅ Correct Answer: 2

A dry one chambered and one seeded fruit developing from a superior ovary with the hard and woody pericarp is:

1. Achene
2. Caryopsis
3. Composite fruit
4. None of the above

✅ Correct Answer: 3

A fruit which develops from an inflorescence is known as:

1. Simple fruit
2. Aggregate fruit
3. Composite fruit
4. None of these

✅ Correct Answer: 3

A fruit which is collection of simple fruits developing from the apocarpous pistil of a flower is known as:

1. Multiple fruit
2. Aggregate fruit
3. Complex fruit
4. Simple fruit

✅ Correct Answer: 2

A generative nucleus in the male gametophyte divides _____ to form two male gametes:

1. Mitotically
2. Meiotically
3. Mitotically and Meiotically
4. None of these

✅ Correct Answer: 1

Zamikand and Taro (Colocasia) are example of:

1. Rhizome
2. Tuber
3. Bulb
4. Corm

✅ Correct Answer: 4

A homozygous line developed by self-fertilization in a cross-pollinated crop is termed as:

1. Pureline
2. Inbred
3. Clone
4. Mutant

✅ Correct Answer: 2

A hybrid is always:

1. Heterozygous
2. Homozygous
3. Both of the above
4. Often homozygous

✅ Correct Answer: 1

A large unit of natural vegetation in an area under identical condition (climatic) is called:

1. Plant formation
2. Association
3. Community
4. Climax

✅ Correct Answer: 1

A maintainer line is:

1. Male fertile and can restore fertility
2. Male sterile but can restore fertility
3. Male sterile but cannot restore fertility
4. Male fertile but cannot restore fertility

✅ Correct Answer: 4

A male gametophyte in angiosperms contains:

1. One gametes only two male gametes only
2. Two male gamete only
3. Two male gametes and one tube nucleusnucleus
4. One male gamete and one tube nucleus

✅ Correct Answer: 3

A male child would be born to parents if:

1. The father is healthier than the mother
2. The mother eats well during pregnancy
3. The genetic composition of the child includes XY combination of chromosomes
4. The genetic composition of the child includes XX combination of chromosomes

✅ Correct Answer: 3

A mendelian population means:

1. Self-pollinated population
2. Inbred population
3. Random-mating population
4. Hybrid population

✅ Correct Answer: 3

A method of breeding most commonly used when the desired variation is required to be induced in a vegetatively propagated crop is:

1. Polyploidy
2. Pedigree method of breeding
3. Mutation breeding
4. Backcross method of breeding

✅ Correct Answer: 1

A plant breeder is interested to control pollination to:

1. Prevent cross-pollination
2. Control pollination
3. None of these
4. Both of these

✅ Correct Answer: 4

A mixture of two immiscible liquids shaken up is:

1. Saturated solution
2. A suspension
3. An emulsion
4. Colloid

✅ Correct Answer: 3

A plant bearing both male and female flowers is said to be:

1. Dioecious
2. Monoecious
3. Polygamous
4. None of above

✅ Correct Answer: 2

A plant cell when put into a hypotonic solution it unlike animal cell does not brust because:

1. It has no semi-permeable membrane
2. It has inelastic cell wall
3. All both (a) & (b)
4. None of the above

✅ Correct Answer: 2

A plant with 2n = 20 will have how many linkage group:

1. 20
2. 10
3. 40
4. 5

✅ Correct Answer: 2

A plant with genotype Gg Ww will produce gametes of which of the following types?

1. GW gw gWGw
2. GGWWggww
3. GwGGGW
4. All of them

✅ Correct Answer: 1

With the increase in temperature the solubility of solid in a liquid:

1. Increases
2. Decreases
3. Both (a) & (b)
4. None of the above

✅ Correct Answer: 1

A restorer gene is present in:

1. Nucleus
2. Cytoplasm
3. Both (a) & (b)
4. None of these

✅ Correct Answer: 1

A state of meiotic cell division when homologous chromosomes separate and move to different poles is known as:

1. Metaphase I
2. Anaphase I
3. Telophase I
4. Anaphase II

✅ Correct Answer: 2

A successful establishment of vegetation in a new locality means:

1. Commensalisnt
2. Ecesis
3. Succession
4. Psammosere

✅ Correct Answer: 2

With four bases A U G and C the possible number of triplet cordons are 64. If there is no uracil the number of codons will be:

1. 3764
2. 9764
3. 27764
4. None of above

✅ Correct Answer: 3

Wind pollination is also known as:

1. Anemophyly
2. Entomophyly
3. Zoophyly
4. Hydrophyly

✅ Correct Answer: 1

Acclimatisation is:

1. A process of adjustment by crop plants to environment
2. Related with the clay
3. Removal of female parts of a flower
4. Changing of climatical condition

✅ Correct Answer: 1

According to position of the ovule within the ovary an ovule may be:

1. Ascending
2. Pendulous
3. Suspended
4. All of the above

✅ Correct Answer: 4

Actual petrified remains of ancient plants and animals or impressions left by them in rocks are called:

1. Fossils
2. Models
3. Traces
4. None of the above

✅ Correct Answer: 1

Adjustment of individual to their environment by mean of special structures or of function of spoken of:

1. Mutation
2. Variation
3. Heredity
4. Adaptation

✅ Correct Answer: 4

Adventitious roots grow from:

1. Radical
2. Plumule
3. Hypophysis
4. Any part of the plant body other than the radical

✅ Correct Answer: 4

After the cell has undergone mitosis the amount of DNA in daughter cells will be:

1. Equal to the parent cell
2. Half of the parent cell
3. Double of the parent cell
4. None of the above

✅ Correct Answer: 1

Albinism in plants is associated with:

1. Epistatis
2. Recessive lethal
3. Dominant lethal
4. Chromosome duplication

✅ Correct Answer: 2

Alternative forms of a gene is known a:

1. Mutation
2. Gamete
3. Allele
4. Genotype

✅ Correct Answer: 3

An anticodonis a sequence of three nitrogenous bases found on:

1. DNA
2. mRNA
3. rRNA
4. tRNA

✅ Correct Answer: 4

An egg or sperm cell in plants is called:

1. Gene
2. Gamete
3. Zygote
4. None of them

✅ Correct Answer: 2

An embryo sac of angiosperms generally contains:

1. Two nuclei
2. Three nuclei
3. Four nuclei
4. Eight nuclei

✅ Correct Answer: 4

An endospermic cell of a seed after somatic chromosome number (2n = 20) will have:

1. 30 Chromosomes
2. 20 Chromosomes
3. 10 Chromosomes
4. 40 Chromosomes

✅ Correct Answer: 1

An individual having different alleles for any gene pair and producting two kinds of gametes is known as:

1. Hemizygous
2. Homozygous
3. Heterozygous
4. Heterogenous

✅ Correct Answer: 3

An association can be:

1. Hydrophytic
2. Halophytic
3. Xerophytic
4. All of the above

✅ Correct Answer: 4

An organism having the gametic chromosome numbers is called as:

1. Genome
2. Hybrid
3. Gamete
4. Haploid

✅ Correct Answer: 4

An organism with one extra chromosome (2n + 1) is instead of the normal diploid (2n) is known as:

1. Monoploid
2. Monosomic
3. Trisomic
4. Tetrasonic

✅ Correct Answer: 3

Ascending portion of the axis of the plant developing directly from the plumule and bears leaves braches and flower is known as:

1. Root
2. Steam
3. Modified root
4. None of above

✅ Correct Answer: 4

At the molecular level point mutations are due to:

1. Destruction of the bases
2. Destruction of the double helix
3. Shifting of a portion of the helix and bases
4. Alterations of sequences of base in DNA

✅ Correct Answer: 4

At the stage incipient plasmolysis the turgor pressure is:

1. Zero
2. 2 atm.
3. 4 atm.
4. 22.4 atm.

✅ Correct Answer: 1

At the stage of fully turgid cell the suction pressure will be:

1. Equal to wall pressure
2. Zero
3. Equal to osmotic pressure
4. Maximum

✅ Correct Answer: 2

ATP synthesis occurs in:

1. Chloroplast
2. Chloroplast and mitochondria
3. Chloroplast mitochomdria and muclei
4. Mitochondria

✅ Correct Answer: 2

Bacteria protozoa and other living plants and animals are:

1. Climatic factors
2. Edaphic factors
3. Biotic factors
4. Topographic factors

✅ Correct Answer: 3

Baldness in human being is a:

1. Sex linked character
2. Sex limited character
3. Sex-influenced character
4. None of the above

✅ Correct Answer: 3

Barely is a ______ pollinated crop:

1. Often-cross
2. Self and cross
3. Cross
4. Self

✅ Correct Answer: 4

Biffin in 1905 announced that resistance to yellow rust of wheat is governed by ______ gene in crosses:

1. Single dominant
2. Single recessive
3. Double dominant
4. Double recessive

✅ Correct Answer: 2

Binomial system of Nomenclature means that the name of plant is made up of two words which designate:

1. Family and genus
2. Order and family
3. Species and family
4. Genus and species

✅ Correct Answer: 4

Bread wheat is:

1. Haploid
2. Diploid
3. Tetraploid
4. Auto-allopolyploid

✅ Correct Answer: 4

A head or capitulum s is characteristic of:

1. Compositeae
2. Umbelliferae
3. Solanaceae
4. Gramineae

✅ Correct Answer: 1

Radish is an example of:

1. Fusiform root
2. Napiform root
3. Conical root
4. Tuberous root

✅ Correct Answer: 1

Origin of Species by means of Natural Selection was given by:

1. Lamark
2. Linnaeus
3. Charles Darwin
4. Erasmus

✅ Correct Answer: 3