CBSE Questions for Class 12 Medical Biology Strategies For Enhancement In Food Production Quiz 13 - MCQExams.com

The process of elimination of diseased birds from a flock is called 
  • Brooding
  • Dubbing
  • Culling
  • Deworming
Four inbred lines of wheat are crossed. The cross is called
  • Double cross
  • Multiple cross
  • Dihybrid cross
  • Tetrahybrid cross
Examples of recalcitrant seeds are
  • Cereals and legumes
  • Mango, cocoa and rubber
  • Cereals and tropical fruits
  • All of the above
Micropropagation technique has been commercially and successfully used in multiplication of
  • Wheat, cotton and bananas
  • Orchid, bananas and potatoes
  • Wheat and sugarcane
  • Sugarcane, barley and sugar beet
Selection of homozygous plant is
  • Mass selection
  • Pure line selection
  • Mixed selection
  • Impure selection
How can we make our crops disease resistant?
  • By spraying insecticides and pesticides
  • By crossing them with their wild relatives
  • Destroying diseased ones
  • Eliminating wild species
Cajanus cajan is commonly known as
  • Black gram
  • Green gram
  • Red gram
  • Bengal gram
The first report of successful production of haploid plants from 'anther culture' in Datura innoxia, came from the work of
  • Steward and White
  • Nitzcli and White
  • Skoog and Murashige
  • Guha and Maheshwari
In high yielding hybrid crop varieties to exploit hybrid vigour, the farmers need to purchase fresh hybrid seed every year because 
  • They are not allowed to grow their own seed.
  • Hybrid vigour is lost due to inbreeding depression.
  • It is cheaper to purchase fresh seed.
  • Government has accepted Dunkel's proposals.
Haploids are of great importance in crop improvement programmes, because they
  • Are useful in meiotic studies
  • Grow better under stress condition
  • Give homozygous lines after diploidisation
  • All of the above
Which is taken as protein supplement in diet?
  • Chlorella
  • Spirulina
  • Both A and B
  • None of the above
Which of the following statement is correct?
  • Apis indica is the largest wild honey bee.
  • Wax is waste material of honey bee.
  • Von Frisch discovered the news transmission methods in the honey bee.
  • Drone of the honey bee is diploid.
Fish used in biological control of mosquito is .....................
  • Gambusia
  • Hilsa hilsa
  • Scalophagus
  • Gold fish
Worker bees are .............
  • Fertile males
  • Fertile females
  • Sterile females
  • Sterile males
A queen honey bee lays eggs of 
  • One type from which all castes develop
  • Two types, one forming queen and workers and second forming drones
  • Three types forming queen, drone and workers
  • Unfertilized eggs die while fertilised ones form all castes
Important objective of biotechnology in agriculture section is
  • To produce pest resistant varieties of plants.
  • To increase the nitrogen content.
  • To decrease the seed number.
  • To increase the plant weight.
Induced breeding (hypophysation) is carried out in case of 
  • Pisciculture
  • Apiculture
  • Sericulture
  • Lac culture
Which among the following is the real product of honey bee?
  • Honey
  • Pollen
  • Bee wax
  • Propolis
Honey bee after discovering the new source of nector / honey can convey the direction
  • Cannot convey the direction.
  • By round or tail wagging dance.
  • By round dance only.
  • By tail wagging dance only.
Life span of worker honey bee is of 
  • 30 days
  • 15 days
  • 45 days
  • 10 days
If the source is opposite to the direction of sun and distance is more than 75 meters then honey bee will convey the direction by
  • Clockwise round dance
  • Upright down tail waving dance
  • Anti-clockwise round dance
  • Opposite to 2 o'clock dance
Which one of the following is the indigenous breed of chickens ?
  • plymouth rock
  • white leghorn
  • aseel
  • rhode island red
Which one of following breeds of cattle is a cross-breed and high milk yielding ?
  • Sahiwal
  • Karan-Swiss
  • Tharparkar
  • Jersey.
Main sugar present in the honey is  
  • maltose
  • levulose
  • dextrose
  • ribose.
Exotic breed of honey bee is  
  • Apis dorsata
  • A. indica
  • A. florea
  • A. mellifera
Pasturage is related to 
  • Cattle farming
  • Fishery
  • Apiculture
  • Poultry farming
Urease enzyme was obtained from
  • Fern
  • Canavalia
  • Ficus
  • Pancreas
Which of the following poultry bird lays maximum number of eggs annually?
  • ILS-82
  • B-77
  • HH-260
  • IBL-80
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 food rich in protein, minerals, vitamins etc.
(b) Body weight-wise the microorganisms Methylophilus methylotrophus may be able to produce several times more proteins, than the cow 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.
  • Statements (a), (b), (d)
  • Statements (b), (c), (d)
  • Statements (a), (b)
  • Statements (c), (d)
The life span of honeybee drone is.
  • 3-4 months
  • 1-2 months
  • 6-7 months
  • 10-12months
H. Harris and J.F. Watkins in 1965 first time reported the fusion of following cell lines to form hybrids
  • Mouse and man
  • Mouse and hamster
  • Mouse and chick erythrocytes
  • Mouse and Drosophila
What is micropropagation?
  • Germination of seed with cotyledons above the soil.
  • A technique to obtain new plants by cultivating the cells or tissues in culture medium.
  • The mature stage of endosperm.
  • To manufacture hormones.
A clone is a group of individuals obtained through______________
  • Hybridisation
  • Cross-pollination
  • Self-pollination
  • Micropropagation
Sometimes urea is fed to ruminants to improve their health. It works by
  • Helping growth of gut microbes that break down cellulose
  • Killing harmful microorganisms in their gut
  • Increasing salt content in the gut
  • Directly stimulating blood cell proliferation
Life span of worker bee is of ................
  • 10 days
  • 15 days
  • 6 weeks
  • 10 weeks
Cloning is obtained through
  • Hybridisation
  • Cross-pollination
  • Self-pollination
  • Micropropagation
In poultry industry, production of hatching eggs is more expensive than the production of market eggs mainly because
  • Cost of males and their depreciation value is high.
  • Mortality among females is usually lower when they are mated with males.
  • Number of eggs produced by hatchery flock are to be sold only as market eggs.
  • Some of the eggs produced by hatchery flocks are not acceptable for incubation.
Micropropagation means
  • Preparation of tissue in the laboratory
  • Genetic engineering
  • Growth of plantlets in nutrient media in the laboratory 
  • Preparation of new tissue by DNA recombination
Consider the statements A-D.
A. Production of plants in an artificial synthetic medium is known as micro propagation.
B. Callus is the cellular mass of tissue developed in the early stage of tissue culture.
C. Orchids, dahlia and carnation plants are raised by means of micropropagation.
D. Air layering (gootee) is practised in grape, rose, raspberry and strawberry plants.
The correct statements are given in
  • Statements A, B and C
  • Statements A and B
  • Statements B, C and D
  • Statements A, B, C and D
Honey has the largest percentage of
  • Water
  • Starch
  • Glucose
  • Sucrose
Match the following.
List IList II
1.Apis cerena Indicaa. African bee
2.Apis mellifera             b. Indian bee
3.Apis adamsonic. Italian bee
  • 1- b, 2- c, 3- a
  • 1- a, 2- b, 3- c
  • 1- c, 2- a, 3- b
  • 1- b, 2- a, 3- c
DNA-DNA hybridization has been used to study the evolutionary placement of lesser (red) and giant pandas. To appreciate this approach, one must remember the complementary bonding nature of DNA strands.
A perfect match between two hybrid strands will yield the highest melting temperature (T$$_m$$) due to optimal hydrogen bonding between the bases while mismatches will lower the T$$_m$$ leading to less than ideal hybridization.
Melting Temperature of Hybrid Pairs ($$^oC$$)
Red pandaRaccoonGiant pandaSpectacled bear
Red panda80685244
Raccoon-825342
Giant panda--8375
Spectacled bear---81
Based on the above results, which of the following would provide the most reasonable model to explain the relationship between these species?
Study the following lists:
List-IList-II
(A) Turrill(I) Tissue culture
(B) Goethe(II) Pollen grains
(III) Nucleosomes
(C) Salisbury(IV) Flower-a modified strem
(D) Oudet(V) Stomatal index
  • A- (V), B- (II), C- (III), D- (IV)
  • A- (IV), B- (I), C- (II), D- (III)
  • A- (II), B- (IV), C- (V), D- (III)
  • A- (III), B- (I), C- (IV), D- (V)
Giriraja is a
  • Cross breed of desi breed of poultry and white leghorn
  • Hybrid of aseel and bursa breeds of poultry
  • Desi breed
  • Cross breed of Plymouth Rock and desi breed of poultry
Single cell protein produced from one of the following microbes is rich in methionine
  • Spirulina maxima
  • Methylophillus methylotrophus
  • Dunaliella salina
  • Scenedesmus acutus
 Wax glands in honey bees are present on these segments.
  • 2, 3 and 4 abdominal segments of queens
  • 2, 3, 4 and 5 abdominal segments of workers
  • 1, 2 and 3 abdominal segments of workers
  • 1, 2, 3 and 4 abdominal segments of queens
Which one of the following is a step in processing of Kipps and Buffs?
  • Deliming
  • Casting
  • Digesting
  • Reeling
In honey the percentage of maltose and other sugar is
  • 9.2
  • 8.81
  • 10.5
  • 11.2
A colony of honey bees affected by CCD (note the small number of adult workers relative to a large amount of unhatched brood that forms the waxy cells in the hive frame. Frames 1 and 3 are most greatly affected).
In 2007, a significant proportion of American beekeepers complained of unusually large losses of bee populations from their overwintering levels in lateLoss of some colonies (approximately 10%) in early spring is normal and occurs every year. The problem was also reported by beekeepers in Europe, and researchers do not understand the specific causes of these losses.
At present, the syndrome is mysterious given that the main symptom is simply a low number of adult bees in the hive. There are no dead bodies and despite the fact that the affected colonies do co-exist with many disease organisms, no external signs of disease, pests or parasites seem to exist.
Both ranchers and commercial honey producers treat livestock and bees with a cocktail of drugs and pesticides to keep them healthy and to ensure the economic success of their operations. Bees are frequently targeted by the insect Varroa destructor, a brood parasite. Varroa has developed resistance to Apistan (containing the synthetic chemical fluvalinate) shortly after being exposed to it. The resistance is linked to a gene carried by the parasite.
Which of the following would be the most likely effect on Varroa resistance to a new and chemically different compound called Amitraz?
526642.png
  • The gene for Apistan-resistance, no longer needed, would disappear entirely from Varroa populations within a few generations.
  • Transmission of the Apistan-resistance gene by conjugation would increase among Varroa populations as the gene would allow for resistance to the new pesticide (Amitraz).
  • Transmission of the Amitraz-resistance gene would gradually increase among Varroa populations due to the destruction of mites lacking the gene for resistance to Amtrak. Thus, surviving mites will make up an increasing proportion of future populations.
  • Transmission of the Apistan-resistance gene would gradually decrease among Varroa populations, but the gene would not entirely disappear.
A colony of honey bees affected by CCD (note the small number of adult workers relative to a large amount of unhatched brood that forms the waxy cells in the hive frame. Frames 1 and 3 are most greatly affected).
In 2007, a significant proportion of American beekeepers complained of unusually large losses of bee populations from their overwintering levels in lateLoss of some colonies (approximately 10%) in early spring is normal and occurs every year. The problem was also reported by beekeepers in Europe, and researchers do not understand the specific causes of these losses.
At present, the syndrome is mysterious given that the main symptom is simply a low number of adult bees in the hive. There are no dead bodies and despite the fact that the affected colonies do co-exist with many disease organisms, no external signs of disease, pests or parasites seem to exist.
Honey bee queens mate on the wing with 10-30 drones (both wild and domesticated varieties) and, as a result of genetic recombination, the broods produced have high genetic variability. Honey bee colonies, including workers, drones and the queen typically comprise a large number of related animals that live at high densities. Diseases of many kinds, including perhaps the cause(s) of CCD, are a constant threat to colony welfare.
Which of the following factors does not plausibly increase the risk of colonies to disease?
526643.png
  • Certain workers are tasked to seek out diseased colony members and remove them far from the colony entrance.
  • Members of the colony routinely exchange food by mouth permitting a route for pathogens to transfer from one to another bee.
  • Some scientists speculate that Varroa, an insect parasite, has reduced wild (feral) bee populations to a greater degree than domesticated bees. As a result, commercial bees are more likely to mate with close relatives than in the past.
  • Imports of honey bees from around the world may mean that commercial honey bee is not well adapted to the local current pathogens and conditions (i.e. the United States).
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