A system of rotating crops with legume or grass pasture to imporve soil structure and fertility is called
(1) Shifting agriculture
(2) Ley farming
(3) Contour farming
(4) Strip farming
A technique of micropropagation is
(1) Embryo rescue
(2) Somatic hybridization
(3) Somatic embryogenesis
(4) Protoplast fusion
Which of the following enhances or induces fusion of protoplasts?
(1) IAA and gibberellins
(2) Sodium chloride and potassium chloride
(3) Polyethylene glycol and sodium nitrate
(4) IAA and kinetin
To obtain virus-free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?
(1) Apical meristem only
(2) Palisade parenchyma
(3) Both apical and axillary meristems
(4) Epidermis only
An alga which can be employed as food for human being is
(1) Ulothrix (2) Chlorella (3) Spirogyra (4) Polysiphonia
In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called
(1) Cross-hybridisation among the selected parents
(2) Evaluation and selection of parents
(3) Germplasm collection
(4) Selection of superior recombinants
Which one of the following is a case of wrong matching ?
(1) Micropropagation-In vitro production of plants in large numbers
(2) Callus–Unorganised mass of cells produced in tissue culture
(3) Somatic hybridization - Fusion of two diverse cells
(4) Vector DNA-Site for t-RNA synthesis
Which part would be most suitable for raising virus-free plants for micropropagation?
(1) Meristem (2) Node (3) Bark (4) Vascular tissue
Green revolution in India occurred during
(1) 1960 's (2) 1970's (3) 1980's (4) 1950's
Consider the following four statements (a-d) and select the option which includes all the correct ones only
(a) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc.
(b) Body weight-wise the micro-organism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day
(c) Common button mushrooms are a very rich source of vitamin C.
(d) A rice variety has been developed which is very rich in calcium.
(1) Statements (c), (d)
(2) Statements (a), (c) and (d)
(3) Statements (b), (c) and (d)
(4) Statements (a), (b)
Mutations can be induced with
(1) Gamma radiations
(2) Infra Red radiations
'Himgiri' developed by hybridisation and selection for disease resistance against rust pathogens is a variety of
(1) Wheat (2) Chilli (3) Maize (4) Sugarcane
"Jaya" and "Ratna developed for green revolution in India are the varieties of
(1) Bajra (2) Maize (3) Rice (4) Wheat
A collection of plants and seeds having diverse alleles of all the genes of a crop is called
(1) Genome (2) Herbarium (3) Germplasm (4) Gene library
Breeding of crops with high levels of minerals, vitamins and proteins is called
(1) Micropropagation (2) Somatic hybridisation
(3) Biofortification (4) Biomagnification
Which of the following plant species you would select for the production of bioethanol?
(1) Zea mays (2) Pongamia
(3) Jatropha (4) Brassica
Somaclones are obtained by
(1) Plant breeding (2) Irradiation
(3) Genetic engineering (4) Tissue culture
Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
(1) Black rust of wheat
(2) Bacterial leaf blight of rice
(3) Downy mildew of grapes
(4) Loose smut of wheat
Consider the following four measures (a - d) that could be taken to successfully grow chick-pea in an area where bacterial blight disease is common
(a) Spray with Bordeaux mixture.
(b) Control of the insect vector of the disease pathogen.
(c) Use of only disease-free seeds.
(d) Use of varieties resistant to the disease.
Which two of the above measures can control the disease?
(1) (a) and (d) (2) (b) and (c)
(3) (a) and (b) (4) (c) and (d)
Which one of the following is being tried in India as a biofuel substitute for fossil fuels?
(1) Aegilops (2) Jatropha
(3) Azadirachta (4) Musa
In maize, hybrid vigour is exploited by
(1) Inducing mutations
(2) Bombarding the seeds with DNA
(3) Crossing of two inbred parental lines.
(4) Harvesting seeds from the most productive plants
Crop plants grown in monoculture are
(1) Low in yield
(2) Free from intraspecific competition
(3) Characterised by poor root system
(4) Highly prone to pests
In maize, hybrid vigour is exploited by
(1) Bombarding the protoplast with DNA
(2) Crossing of two inbreed parental lines
(3) Harvesting seeds from the most productive plants
(4) Inducing mutations
Triticale, the first man-made cereal crop, has been obtained by crossing wheat with
(1) Rye (2) Pearl millet (3) Sugarcane (4) Barley
In order to obtain virus-free plants through tissue culture the best method is
(1) Protoplast culture (2) Embryo rescue
(3) Anther culture (4) Meristem culture
Three crops that contribute maximum to global food grain production are
(1) Wheat, rice and maize (2) Wheat, maize and sorghum
(3) Rice, maize and sorghum (4) Wheat, rice and barley
The name of Norman Borlaug is associated with
(1) Green revolution (2) Yellow revolution
(3) White revolution (4) Blue revolution
An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the
(1) Preparation of pure cellulose by removing lignin
(2) Removal of oils present in the wood by treatment with suitable chemicals
(3) Removal of water from the wood by prolonged heating at approximately 50°C
(4) Treatment of wood with chemical that breakdown cellulose
Which of the following is generally used for induced mutagenesis in crop plants?
(1) Alpha particles (2) X-rays
(3) UV (260 nm) (4) Gamma rays (from cobalt 60)
Which statement is correct about centre of origin of plant?
(1) More diversity in improved variety
(2) Frequency of dominant gene is more
(3) Climatic conditions are more favourable
(4) None of these
When two unrelated individuals or lines are crossed, the performance of F1 hybrid is often superior to both its parents. This phenomenon is called
(1) Metamorphosis (2) Heterosis
(3) Transformation (4) Spheing
Which of the following is the New World spice, that has become an essential part of Indian cuisine?
(1) Red pepper (2) Black pepper
(3) Ginger (4) Cardamom
The reason for vegetativeIy reproducing crop plants suit for maintaining hybrid vigour is that
(1) They are more resistant to diseases
(2) Once a desired hybrid produced, no chances of losing it
(3) They can be easily propagated
(4) They have a longer life span
The new varieties of plants are produced by
(1) Introduction and mutation
(2) Selection and introduction
(3) Selection and hybridization
(4) Mutation and selection
Before the European invader which vegetable was absent in India?
(1) Potato and tomato
(2) Simla mirch and brinjal
(3) Maize and chichinda
(4) Bitter gourd
Which of the following crops have been brought to India from New World?
(1) Cashewnut, potato, rubber (2) Mango, tea
(3) Tea, rubber, mango (4) Coffee
A germplasm collection is a
(1) Collection of specimens of all the species of an area in a herbarium or botanical garden
(2) Collection of modern varieties of a crop
(3) Collection of plants or seeds having diverse alleles of all genes in a crop
(4) Collection of seeds or pollen of rare and threatened species of a group or area
Bacterial leaf blight of rice is caused by a species of
(1) Erwinia (2) Xanthomonas
(3) Pseudomonas (4) Alternaria
Introduction of food plants developed by genetic engineering is not desirable because
(1) Economy of developing countries may suffer
(2) These products are less tasty as compared to the already existing products
(3) This method is costly
(4) There is threat of entry of viruses and toxins with introduced crop
Which one of the following plants are used as green manure in crop fields and in sandy soils ?
(1) Crotalaria juncea and Alhagi camelorum
(2) Calotropis procera and Phyllanthus niruri
(3) Saccharum munja and Lantana camara
(4) Dichanthium annulatum and Azolla nilotica
Nicotiana sylvestris flowers only during long days and N.tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be crossfertilized to produce self-fertile offspring. What is the best reason for considering N.sylvestris and N.tabacum to be separate species?
(1) They cannot interbreed in nature
(2) They are reproductively distinct
(3) They are physiologically distinct
(4) They are morphologically distinct
Which of the following statements is not true about somatic embryogenesis?
(1) A somatic embryo develops from a somatic cell
(2) The pattern of development of a somatic embryo is comparable to that of a zygotic embryo
(3) Somatic embryos can develop from microspores
(4) Somatic embryo is induced usually by an auxin such as 2, 4-D
Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising
(1) Variants through picking up somaclonal variations
(2) Genetically uniform population identical to the original parent
(3) Homozygous diploid plants
(4) Development of new species
Cellular totipotency is demonstrated by
(1) Only gymnosperm cells
(2) All plant cells
(3) All eukaryotic cells
(4) Only bacterial cells
In tissue culture medium, the embryoids formed from pollen grains are due to
(1) Cellular totipotency (2) Organogenesis
(3) Double fertilization (4) Test tube culture