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Published on: 31/05/2021
QB365 Provides the Value Based Question Papers for Class 12 Biology, and also provide the detail solution for each and every Value Based Questions. Value Based Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test

1.
Teacher explains about the process of biofortification, in which he explains that, this method is useful in providing nutrition to large population. Akshay asked some question about this from his teacher.
(i) What is biofortification?
(ii) What types of nutritional enrichment can be possible through this?
(iii) What is Atlas 66?
(iv) What values are shown by Akshay as biology student?
2.
Biofortification is a method of breeding crops with higher levels of vitamins and minerals or higher proteins and healthier fats in the view of improving public health.
(1) Give examples of biofortified food.
(2) How is this process useful in controlling night blindness in poor countries.
3.
Viruses are principally composed of nucleoproteins. Virus is an obligate parasite. It is inert outside the host cell. An inert virus is called virion. It can be crystallised and stored indefinitely. A biosynthetic machinery is absent. There is no system to liberate energy. A virus does not grow. It does not divide or reproduce like typical organism. Instead it multiplies by independent formation of its parts using host machinery and then assembly of parts occurs to produce virus particles. A assembly of parts occurs to produce virus particles. A virus lacks irritability and motility. It requires a vector for transfer from one host to another. They are major for transfer from one host to another. They are major cause of disease in humans; some diseases of agriculturally important animals and plants are also known to be caused by viruses.
Read the passage and answer the following questions.
(i) Viruses cause damage to plants. Name two viral diseases of plant and their causative organisms.
(ii) Describe any method to obtain viral free plant for better yield.
4.
Expand MOET. Explain the procedure of this technology in cattle improvement.
5.
Differentiate between inbreeding and out breeding in cattle. State on eadvantage and on edisadvantage for each one of them.
1.
(iv) Akshay is inquisive and interested in various facts of scientific development.
2.
(i) Golden rice.
(ii) Golden rice is a transgenic variety of rice which contains good quantities of \(\beta\)- carotene (provitamin A).
3.
(i) Viruses diseases of plants:
(a) Leaf curl of potato caused by Nicotiana virus.
(b) Tobacco mosaic caused by Tobacco mosaic virus.
(ii) 1. The conventional method of breeding for disease-resistance is hybridisation and selection. The various sequential steps are: screening germplasms for disease-resistance source hybridization of selected parents, selection and evoluation of hybrids and testing and release of new varieties.
2. Tissue culture technique.
4.
(a) Multiple ovulation Embryo Transfer , (MOET) technology
(b) Steps in MOET technology:
A cow is administered hormones with FSH-like activity to induce follicular maturation and superovulation, i.e. instead of one egg, 6-8 eggs are produced per cycle.
The animal is either mated with an elite bull or artificially inseminated.
The fertilised eggs are recovered at the 8-32 celled stages, nonsurgically.
They are then transferred to surrogate mothers.
The genetic mother is available for and her round of superovulation.
5.
| Inbreeding | Outbreeding |
|---|---|
| Inbreeding refers to the mating of more closely related individuals within the same breed for 4-6 generations. | Outbreeding refers to the breeding of unrelated animals of the same breed with no common ancestors, or between two different breeds or different species |
Advantages:
Inbreeding: It is used to evolve purelines in animals.
Outbreeding: These methods are used for improving the yield of animals and also to produce new breeds.
Disadvantages:
Inbreeding: Continuous inbreeding leads to inbreeding depression and reduction in productivity.
Outbreeding: The success rate may below and the desired combinations of characters may appear in low frequency.
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