CBSE Questions for Class 12 Medical Biology Strategies For Enhancement In Food Production Quiz 14 - MCQExams.com

$$\textbf{Correct Option B}$$

$$\textbf{Solution}$$

$$\bullet$$Pea comb is a type of chicken comb which is present at the base of the beak and gradually extend towards the head of the chicken.

$$\bullet$$ This comb actually helps the chicken to stay cool and it is a found in Brahma breed of chicken.

$$\bullet$$ These chickens are tall and contains a heavy head. They lay brown coloured eggs and have a wide head with pea comb.

$$\bullet$$ So, the correct option is B.

$$\textbf{Correct answer: C}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ The tissue culture technique is not used for the development of new species. This is because the new plant is produced from cells collected from an old plant. 

$$\bullet$$ The morphological and genetic character of the old plant is maintained as the entire plant originates from the tissues. 

$$\textbf{Option (B):}$$ 

$$\bullet$$ Tissue culture technique is not used to produce variants by picking up the somaclonal variation.

$$\textbf{Option (C):}$$ 

$$\bullet$$ The genetically uniform population is maintained as from a single type of cell the entire plant is developed. 

$$\bullet$$ If an elite species of plant is developed, then by using the different regions of the plant the propagation of new plants takes place with complete genetic similarity and the same morphology. 

$$\textbf{Option (D):}$$ 

$$\bullet$$ Tissue culture can be used to develop homozygous diploid plants but it is not the only type of plant that can be produced through tissue culture. 

Hence, the correct answer is option (C).

$$\textbf{Correct Option B}$$

$$\textbf{Solution}$$

$$\bullet$$ $$\textbf{Option (i)}$$ Regular inspection and visiting of the veterinary doctors is one of the most prior procedures which are followed in dairy farm management. This will look into the health of the animals which will regulate the increase yield of milk.

$$\bullet$$ $$\textbf{Option (ii)}$$ The adequate use of manure is to increase the crop yields. It is not associated with the management of dairy farm.

$$\bullet$$ $$\textbf{Option (iii)}$$ Adequate environmental condition must be provided to the cows which will improve the quality of the milk. This procedure must be followed in the dairy farm management and its products for human consumption.

$$\bullet$$ $$\textbf{Option (iv)}$$ Weeding away on productive and harmful plants provides better opportunity for increasing crop yields. This process is not associated with dairy farm management.

So, the correct option is B.

A.Correct option C

B.Explanation for the correct option:

1. Late blight of potato is not caused by virus.

2. Its causative agent is a fungus name Phytophthora infestans.

3. It can result in crop failure in a very short time.

4. Winter season is the most favorable for this fungus to attack potato mainly in the lower region of the crop.

6. Symptoms includes purple depressions over the crop.

So, the correct answer is 'Disease - Late blight of potato; Causative Organism - Virus'

• Apis dorsata is a rock bee as it is found in sub-mountainous region of India over an altitude of 2700m.  It is the largest bee among the other bees produces 36 Kg of honey per year per comb.
  
• Apis florea is called as a little bee as its size is very small and it is the smallest among the species of Apis. 
• Apis mellifera is called a European bee which builds parallel combs and produces 25-40 Kg honey per year.
  
• Apis cerana indica is an Indian bee which constructs multiple parallel combs and produces 6-8 Kg honey per colony per year. 
  

• Chlorella (green alga), as a food supplement is rich in protein and carbohydrates. It yields about 30% proteins, 15% lipids, 30% carbohydrates, and 5% ash. 
• Spirulina platensis (blue-green alga) is one of the richest sources of protein and vitamin $$B_{2}$$. 
• In long-range space exploration, scientists have turned to Chlorella and Spirulina to use them as portable oxygen generators and food sources.

• The scientific process of breeding crops or using genetically engineered crops with higher level of selected micronutrients like vitamins and or minerals is called bio-fortification. It is the most practical means to improve public health. 
  
• Example, Golden rice which is enriched with Vitamin A.
• Biofortification of rice, Cassava, Sweet potato etc with Iron
• Biofortification of Wheat,  beans, Maize etc with Zinc
• Breeding is the mating and production of offsprings of animals through natural or artificial process
• Crop protection is the collection of tools, products and practises farmers used to defend their crops against weeds, insects and disease. 
• Bio remediation is a process used to treat contaminated media by altering environmental conditions to stimulate growth of microorganisms. 
• So, the correct option is 'Option C ' .

$$\textbf{Correct Option A}$$ 

$$\textbf{Solution}$$

$$\bullet$$ $$\textbf{Option A}$$  A line is actually a group of individuals which are related to each other by a descent. These individuals are known to have similar genotype. The individual lines which are used in hybridization is known as parents.

$$\bullet$$ $$\textbf{Option B}$$   Hybridization is the process in which two lines having different genotypes are mated together. The offspring which is produced after hybridization is called a hybrid.

$$\bullet$$ $$\textbf{Option C}$$  Emasculation is a process in which stamen of the flower is removed in order to prevent self hybridization.

$$\bullet$$ $$\textbf{Option D}$$ This option is incorrect.

So, the correct option is A.