CBSE Class 12 Biology Strategies for Enhancement in Food Production MCQs Set B

Question. Haploid plants are preferred over diploids for mutation study because in haploids
(a) recessive mutation express immediately
(b) induction of mutations is easier
(c) culturing is easier
(d) dominant mutation express immediately.

Answer : A

Question. Select the incorrect statement.
(a) Inbreeding helps in accumulation of superior genes and elimination of undesirable genes.
(b) Inbreeding increases homozygosity.
(c) Inbreeding is essential to evolve purelines, in any animal.
(d) Inbreeding selects harmful recessive gene that reduce fertility and productivity.

Answer : D

Question. High milk yielding varieties of cows are obtained by
(a) use of surrogate mothers
(b) superovulation
(c) artificial insemination
(d) all of these.

Answer : D

Question. The silkworm silk is the product of
(a) salivary gland of the larva
(b) salivary gland of the adult
(c) cuticle of the larva
(d) cuticle of the adult.

Answer : A

Question. Cocoa is the plant from which chocolate is made. Which part is used to extract it?
(a) Flower
(b) Fruit
(c) Seeds
(d) Bark

Answer : D

Question. India’s wheat yield revolution in the 1960s was possible primarily due to
(a) hybrid seeds
(b) increased chlorophyll content
(c) mutations resulting in plant height reduction
(d) quantitative trait mutations.

Answer : D

Question__________ is an instrument that helps to achieve specific temperature and pressure for scientific/medical and industrial applications.
(a) Sterilizers
(b) Autoclave
(c) Electrosurgical unit
(d) None of the above

Answer : B

Question. Green revolution in India occurred during
(a) 1960’s
(b) 1970’s
(c) 1980’s
(d) 1950’s.

Answer : A

Question. Bioenergy is obtained from __________
(a) Sun
(b) Coal
(c) Biomass
(d) Petroleum

Answer : C

Question. ____________ is an example of an American breed of poultry
(a) Leghorn
(b) Sulmtaler
(c) Augsburger
(d) Manx Rumpy

Answer : A

Question. Coconut milk is used in tissue culture in which present
(a) cytokinin
(b) auxin
(c) gibberellin
(d) ethylene.

Answer : A

Question. A protoplast is a cell
(a) undergoing division
(b) without cell wall
(c) without plasma membrane
(d) without nucleus.

Answer : B

Question. Hisardale is a new breed of sheep developed in Punjab by one of the breeding technique in which superior male of one breed is mated with superior females of another breed.
Identify the breeding technique from the option given below.
(a) Inbreeding
(b) Out crossing
(c) Out breeding
(d) Cross breeding

Answer : D

Question. Haploids are more suitable for mutation studies than the diploids. This is because
(a) haploids are more abundant in nature than diploids
(b) all mutations, whether dominant or recessive are expressed in haploids
(c) haploids are reproductively more stable than diploids
(d) mutagens penetrate in haploids more effectively than in diploids.

Answer : B

Question. Before the European invader which vegetable was absent in India?
(a) Potato and tomato
(b) Shimla mirch and brinjal
(c) Maize and chichinda
(d) Bitter gourd

Answer : A

Question. A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called
(a) strip farming
(b) shifting agriculture
(c) ley farming
(d) contour farming.

Answer : C

Question. Which ones produce androgenic haploids in anther cultures?
(a) Anther wall
(b) Tapetal layer of anther wall
(c) Connective tissue
(d) Young pollen grains

Answer : D

Question. Essential oils are those which
(a) are essential to the plant itself
(b) are used as lubricants
(c) produce perfumes
(d) are essential for human beings

Answer : C

Question. Crop plants grown in monoculture are
(a) highly prone to pests
(b) low in yield
(c) free from intraspecific competition
(d) characterised by poor root system.

Answer : A

Question. Compared to a bull a bullock is docile because of
(a) higher levels of cortisone
(b) lower levels of blood testosterone
(c) lower levels of adrenaline/noradrenaline in its blood
(d) higher levels of thyroxine.

Answer : B

Question. The reason for vegetatively reproducing crop plants to suit for maintaining hybrid vigour is that
(a) they are more resistant to diseases
(b) once a desired hybrid produced, no chances of losing it
(c) they can be easily propagated
(d) they have a longer life span.

Answer : B

Question. Somaclonal variation appears in
(a) organisms produced through somatic hybridization.
(b) plants growing in highly polluted conditions.
(c) apomictic plants.
(d) tissue culture raised plants.

Answer : A

Question. A collection of plants and seed having diverse alleles of all the genes of a crop is called
(a) herbarium
(b) germplasm
(c) gene library
(d) genome.

Answer : B

Question. Which one of the following constitutes natural silk?
(a) Nitrogen
(b) Magnesium
(c) Potassium
(d) Phosphorus

Answer : A

Question. The chemical which are produced by host plants due to infection as a defence reaction to pathogen, are called
(a) phytotoxin
(b) toxin
(c) phytotron
(d) phytoalexins

Answer : B

Question. Tissue culture technique can produce infinite number of new plants from a small parental tissue. The economic importance of the technique is in raising
(a) genetically uniform population identical to the original parent
(b) homozygous diploid plants
(c) new species
(d) variants through picking up somaclonal variations.

Answer : A

Question. Which of the following is a viral disease of poultry birds?
(a) Anthrax
(b) Ranikhet
(c) Coccidiosis
(d) None of these

Answer : B

Question. Which one of the following is a viral disease of poultry?
(a) Coryza
(b) New castle disease
(c) Pasteurellosis
(d) Salmonellosis

Answer : B

Question. Which statement is correct?
(a) A. indica is largest wild honeybee.
(b) Wax is waste material of honeybee.
(c) Workers are the smallest of the three castes.
(d) Drone of honeybee is diploid.

Answer : C

Question. In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are
(a) n = 21 and x = 21
(b) n = 21 and x = 14
(c) n = 21 and x = 7
(d) n = 7 and x = 21.

Answer : C

Question. Triticale, the first man-made cereal crop, has been obtained by crossing wheat with
(a) barley
(b) rye
(c) pearl millet
(d) sugarcane.

Answer : B

Question. An alga which can be employed as food for human being is
(a) Ulothrix
(b) Chlorella
(c) Spirogyra
(d) Polysiphonia.

Answer : B

Question. Green Revolution was led by __________
(a). Dennis Rodman
(b) Norman Borlaug
(c) Jane Goodall
(d) None of the above

Answer : B

Question. Somaclones are obtained by
(a) plant breeding
(b) irradiation
(c) genetic engineering
(d) tissue culture.

Answer : D

Question. Azolla is used as a biofertilizer because it
(a) multiplies very fast to produce massive biomass
(b) has association of nitrogen-fixing Rhizobium
(c) has association of nitrogen-fixing Cyanobacteria
(d) has association of mycorrhiza

Answer : B

Question. The technique of obtaining large number of plantlets by tissue culture method is called
(a) plantlet culture
(b) organ culture
(c) micropropagation
(d) macropropagation.

Answer : C