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
A fruit which develops from an inflorescence is known as:
1.Simple fruit
2.Aggregate fruit
3. Composite fruit
4.None of these
A homozygous line developed by self-fertilization in a cross-pollinated crop is termed as:
1.Pureline
2.Inbred
3.Clone
4.Mutant
A mixture of two immiscible liquids shaken up is:
1.Saturated solution
2.A suspension
3.An emulsion
4.Colloid
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
A successful establishment of vegetation in a new locality means:
1.Commensalisnt
2.Ecesis
3.Succession
4.Psammosere
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
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
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
Bread wheat is:
1.Haploid
2.Diploid
3.Tetraploid
4.Auto-allopolyploid
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
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
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
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
A condition in which pollination and fertilization take place in an unopened flower is termed as:
1.Homogamy
2.Apogamy
3.Polygamy
4.Cleistogamy
A criss-cross inheritance is shown by:
1.Sex-influenced character
2.Polygamy
3.Sex-linked character
4.Sex-quantitative character
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
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
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
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
A plant breeder is interested to control pollination to:
1. Prevent cross-pollination
2.Control pollination
3.None of these
4.Both of these
According to position of the ovule within the ovary an ovule may be:
1.Ascending
2.Pendulous
3.Suspended
4.All of the above
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
Albinism in plants is associated with:
1.Epistatis
2.Recessive lethal
3. Dominant lethal
4.Chromosome duplication
An anticodonis a sequence of three nitrogenous bases found on:
1.DNA
2.mRNA
3.rRNA
4.tRNA
An egg or sperm cell in plants is called:
1.Gene
2.Gamete
3.Zygote
4.None of them
An organism having the gametic chromosome numbers is called as:
1.Genome
2.Hybrid
3.Gamete
4.Haploid
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
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
______ are examples of protandrous species:
1.Avocados
2.Walnuts
3.Carrots
4.None of these
______ deteriorates drastically upon inbreeding:
1.Carrot
2.Okara
3.Brinjal
4.Broccoli
_______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
2n - 1 is a:
1.Monosomic
2.Transonic
3.Tetrasomic
4.Alloploid
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
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
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
A head or capitulum s is characteristic of:
1.Compositeae
2.Umbelliferae
3.Solanaceae
4.Gramineae
A hybrid is always:
1.Heterozygous
2.Homozygous
3.Both of the above
4.Often homozygous
A large unit of natural vegetation in an area under identical condition (climatic) is called:
1.Plant formation
2.Association
3.Community
4.Climax
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
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
A mendelian population means:
1.Self-pollinated population
2.Inbred population
3.Random-mating population
4.Hybrid population
A plant bearing both male and female flowers is said to be:
1.Dioecious
2.Monoecious
3.Polygamous
4.None of above
A plant with 2n = 20 will have how many linkage group:
1.20
2.10
3.40
4.5
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
A restorer gene is present in:
1.Nucleus
2.Cytoplasm
3.Both (a) & (b)
4.None of these
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
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
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
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
Adventitious roots grow from:
1.Radical
2.Plumule
3.Hypophysis
4.Any part of the plant body other than the radical
Alternative forms of a gene is known a:
1.Mutation
2.Gamete
3.Allele
4.Genotype
An association can be:
1.Hydrophytic
2.Halophytic
3.Xerophytic
4.All of the above
An embryo sac of angiosperms generally contains:
1.Two nuclei
2.Three nuclei
3.Four nuclei
4.Eight nuclei
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
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
At the stage incipient plasmolysis the turgor pressure is:
1.Zero
2.2 atm.
3.4 atm.
4.22.4 atm.
ATP synthesis occurs in:
1.Chloroplast
2.Chloroplast and mitochondria
3.Chloroplast mitochomdria and muclei
4.Mitochondria
Bacteria protozoa and other living plants and animals are:
1.Climatic factors
2.Edaphic factors
3.Biotic factors
4.Topographic factors
Baldness in human being is a:
1.Sex linked character
2.Sex limited character
3.Sex-influenced character
4.None of the above
Barely is a ______ pollinated crop:
1.Often-cross
2.Self and cross
3.Cross
4.Self
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
Experiments in Plant Hybridization a paper of G. Mendal was first published in the year:
1.1905
2.1787
3.1866
4.1896
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
Origin of Species by means of Natural Selection was given by:
1.Lamark
2.Linnaeus
3.Charles Darwin
4.Erasmus
Radish is an example of:
1.Fusiform root
2.Napiform root
3.Conical root
4.Tuberous root
Wind pollination is also known as:
1.Anemophyly
2.Entomophyly
3.Zoophyly
4.Hydrophyly
Zamikand and Taro (Colocasia) are example of:
1.Rhizome
2.Tuber
3.Bulb
4.Corm
_____ 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
_______provides the best documented example of long time effects of selection:
1.Sugarcane
2.Sweet sorghum
3.Sugarbeet
4.Sugar maple