CBSE Class 12 Biology Strategies for Enhancement in Food Production Assignment Set A

Question. After India independence, one of the main challenges facing the country was
(a) improving science and technology
(b) producing enough food for increasing population
(c) production of disease resistance varieties of crops
(d) Both (b) and (c)
Answer : B

Question. Semidwarf variety of wheat was developed by
(a) Norman E Borlaug
(b) MS Swaminathan
(c) WY Cheung
(d) Fontana
Answer : A

Question. Hidden hunger is best indicated as
(a) inability of majority of people to buy enough fruits, vegetables, legumes, fish and meat and thus suffer from deficiency of vitamin, protein, etc.
(b) people are unable to buy healthy drink item and thus suffer from deficiency
(c) people are unable to buy junk food thus suffer from deficiency
(d) All of the above
Answer : A

Question. Majority of people suffer from malnutrition because their food does not contain essential micronutrients specially
(a) iron
(b) iodine and zinc
(c) vitamin-A
(d) All of these
Answer : A

Question. The deficiency of essential micronutrients in food may
I. increase risk for disease.
II. reduce mental ability.
III. reduce lifespan.
Choose the correct option.
(a) I, II and III
(b) I and III
(c) Only I
(d) I and II
Answer : A

Question. Semidwarf variety of wheat was developed at
(a) International Centre for Wheat and Maize Improvement Brazil
(b) International Centre for Wheat and Maize Improvement Mexico
(c) International Centre for Wheat and Rice Improvement Japan
(d) International Centre for Wheat and Gram Improvement Mexico
Answer : B

Question. Example of high yielding and disease resistant wheat variety is
(a) Sonalika
(b) IR-8
(c) Ratna
(d) Jaya
Answer : A

Question. Saccharum officinarum variety of sugarcane had
(a) thin stems and higher sugar content
(b) thick stems and higher sugar content
(c) thick stems and poor sugar content
(d) thin stems and poor sugar content
Answer : B

Question. The genetic ability of a plant to prevent pathogens from causing disease is called
(a) resistance
(b) prevention
(c) pathology
(d) None of these
Answer : A

Question. Which one of the following is a bacterial disease?
(a) Tobacco mosaic
(b) Turnip mosaic
(c) Black rot of crucifer
(d) Late blight of potato
Answer : C

Question. Hairy root disease of dicot plants is caused by
(a) Agrobacterium tumefaciens
(b) Agrobacterium rhizogene
(c) Bacillus thuringiensis
(d) Meloidogyne incognita
Answer : B

Question. Method(s) of breeding plants for acquiring disease resistance is/are
(a) conventional breeding techniques
(b) mutation breeding
(c) tissue culture
(d) Both (a) and (b)
Answer : D

Question. Microbes like Spirulina, can also be grown on industrial scale as source of good
(a) fat
(b) carbohydrate
(c) minerals
(d) All of these
Answer : D

Question. Single cell protein reduces
(a) environmental pollution
(b) greenhouse effect
(c) global warming
(d) production and growth of crop
Answer : A

Question. 250 g of Methylophilus methylotrophus bacterium has been used to produce
(a) 15 tonnes of proteins
(b) 25 tonnes of proteins
(c) 35 tonnes of proteins
(d) 50 tonnes of proteins
Answer : B

Question. The conventional method of breeding for disease resistance includes
(a) screening of germplasm for resistant sources.
(b) hybridisation of selected parents.
(c) induction of mutation.
(d) Both (a) and (b)
Answer : D

Question. Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of
(a) chilli
(b) maize
(c) sugarcane
(d) wheat 
Answer : D

Question. Some crop varieties bred by hybridisation and selection for disease resistance to fungi, bacteria and viral disease are shown below. Fill up the blanks A to D. 
(a) A–Wheat, B–White rust, C–Pusa Komal, D–Pusa Sadabahar
(b) A–Pusa Sadabahar, B–Black rust, C–Pusa Komal, D–Wheat
(c) A–Rice, B–White rust, C–Pusa Karan, D–Wheat
(d) A–Maize, B–Brown rust, C–Pusa Karan, D–Millet
Answer : A

Question. Triticale is the first man-made cereal crop.
Mention the type of hybridisation through which it was produced 
(a) intervarietal hybridisation
(b) interspecific hybridisation
(c) intergeneric hybridisation
(d) intravarietal hybridisation
Answer : C

Question. Consider the following measures that could be taken to successfully grow chickpea in an area where bacterial blight is common. 
(a) Spray with bordeaux mixture
(b) Use of disease-free seeds only
(c) Use of varieties resistant to the disease
(d) All of the above
Answer : D

Question. In mung bean, resistance to yellow mosaic virus and powdery mildew were brought about by
(a) mutation breeding
(b) biofortification
(c) tissue culture
(d) hybridisation and selection
Answer : A

Question. Resistance to yellow mosaic virus in bhindi was transferred from a wild species and resulted in new variety of A. esculentus called
(a) Golden Kranti
(b) Sonalika
(c) IR-8
(d) Parbhani Kranti
Answer : D

Question. The host crop plants may be resistant to insect pests due to the
(a) morphological characteristics
(b) biochemical characteristics
(c) physiological characteristics
(d) All of the above
Answer : D

Question. Hairy leaves of many plants are associated with resistance to …… .
(a) insect pests
(b) bacteria
(c) virus
(d) bollworm
Answer : A

Question. Solid stem in wheat exhibits non-preference by
(a) jassids
(b) fruit borer
(c) stem borer
(d) stem sawfly
Answer : D

Question. Semidwarf varieties of rice were derived from
(a) IR-8 and Taichung Native-I
(b) Atlas 66
(c) Kalyan Sona
(d) Jaya and Ratna
Answer : A

Question. International Rice Research Institute (IRRI) is situated at
(a) New York (USA)
(b) Tokyo (Japan)
(c) Manilla (Philippines)
(d) Hyderabad (India)
Answer : C

Question. In cotton, smooth leaf and the absence of nectar repel
(a) sawfly
(b) bollworms
(c) beetle
(d) jassids
Answer : B

Question. In maize, the presence of high aspartic acid, low nitrogen and sugar content protect them from
(a) aphids
(b) fruit borers
(c) jassids
(d) stem borers
Answer : D

Question. Some released crop varieties bred by hybridisation and selection, for insect pest resistance are given in the table. Fill up the blanks. (Image 83)
(a) A–Pusa Karan, B–Flat bean, C–Bhindi
(b) A–Pusa Gaurav, B–Flat bean, C–Okra
(c) A–Pusa Shubhra, B–Wrinkled bean, C–Pea
(d) A–Pusa Komal, B–Smooth bean, C–Bhindi
Answer : B

Question. Which of the following are not disease resistant varieties?
(a) Pusa Gaurav
(b) Pusa Sem-2
(c) Pusa Sawani
(d) All of these
Answer : D

Question. Biofortified crops are
(a) crops with increased yield
(b) crops with disease resistance
(c) herbicide resistant crops
(d) crops with high nutritive value
Answer : D

Question. The Indian Agricultural Research Institute, New Delhi has released several fortified vegetable crops that are rich in vitamins and minerals. They are
I. Vitamin-A enriched carrot, spinach, pumpkin.
II. Vitamin-C enriched bitter gourd, bathua, mustard and tomato.
III. Iron and calcium enriched spinach and bathua.
IV. Protein enriched broad beans, French bean, garden pea.
Choose the correct option.
(a) I, II and IV
(b) All of these
(c) II, III and IV
(d) None of these
Answer : B

Question. One of the alternate sources of protein for animal and human nutrition is
(a) single cell protein
(b) proteomix
(c) double cell protein
(d) All of these
Answer : A

Question. Single cell protein is an alternative protein source for animal and human nutrition formed from certain beneficial microorganisms like
(a) Spirulina
(b) Methylophilus methylotrophus
(c) Both (a) and (b)
(d) None of the above
Answer : C

Question. Saccharum barberry had poor sugar content and yield. This veriety of sugar cane mainly grown in which part of india ?
(a) South India
(b) East India
(c) North India
(d) West India 

Answer : C

Question. In mung bean, resistance to yellow mosaic virus and powdery mildew were induced by :
(a) Plant introduction
(b) Plant tissue culture
(c) Hybridisation
(d) Mutation

Answer : D

Question. Which chemical is used in somatic hybridisation ?
(a) Polyethyline glycole
(b) Acredine
(c) HNO2
(d) Ethenol

Answer : A

Question. 'P-1542' is a hybrid variety of which plant ?
(a) Wheat
(b) Rice
(c) Maize
(d) Pea

Answer : D

Question. "Jaya" and "Ratna" are better yielding semi dwart varieties of rice. These varieties are doveloped in which country ?
(a) Japan
(b) India
(c) Phillipins
(d) Mexico

Answer : B

Ques. In crop movement programme, haploids are important because they
(a) require one half of nutrients
(b) are helpful in study of meiosis
(c) grow better under adverse conditions
(d) form perfect homozygous. 

Answer: D

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

Answer: B

Ques. 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 microorganism 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.
(a) Statements (C) and (D)
(b) Statements (A), (C) and (D)
(c) Statement (B), (C) and (D)
(d) Statement (A) and (B) 

Answer: D

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

Answer: B

Ques. A technique of micropropagation is
(a) protoplast fusion (b) embryo rescue
(c) somatic hybridisation
(d) somatic embryogenesis. 

Answer: D

Ques. Which of the following enhances or induces fusion of protoplasts?
(a) IAA and kinetin
(b) IAA and gibberellins
(c) Sodium chloride and potassium chloride
(d) Polyethylene glycol and sodium nitrate

Answer: D

Ques. To obtain virus - free healthy plants from a diseased one by tissue culture technique, which part/parts of the diseased plant will be taken?
(a) Apical meristem only
(b) Palisade parenchyma
(c) Both apical and axillary meristems
(d) Epidermis only 

Answer: C

Ques. 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

Ques. Which of the following statements is not true about somatic embryogenesis?
(a) The pattern of development of a somatic embryo is comparable to that of a zygotic embryo.
(b) Somatic embryos can develop from microspores.
(c) Somatic embryo is induced usually by an auxin such as 2, 4-D.
(d) A somatic embryo develops from a somatic cell.

Answer: B

Ques. Which part would be most suitable for raising virus-free plants for micropropagation ?
(a) Bark
(b) Vascular tissue
(c) Meristem
(d) Node 

Answer: C

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

Answer: D

Ques. In order to obtain virus-free plants through tissue culture the best method is
(a) meristem culture
(b) protoplast culture
(c) embryo rescue
(d) anther culture. 

Answer: A

Ques. 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

Ques. Cellular totipotency is demonstrated by
(a) only gymnosperm cells
(b) all plant cells
(c) all eukaryotic cells
(d) only bacterial cells. 

Answer: B

Ques. In tissue culture medium, the embryoids formed from pollen grains is due to
(a) cellular totipotency
(b) organogenesis
(c) double fertilization
(d) test tube culture.

Answer: A

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

Answer: A

Ques. Cellular totipotency was demonstrated by
(a) Theodore Schwann
(b) A.V. Leeuwenhoek
(c) F.C. Steward
(d) Robert Hooke. 

Answer: C

Ques. 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