Class 12th Biology 2018 Set1 Delhi Board Paper Solution
Question 16
How has the development of bioreactor helped in biotechnology?
Answer
Bioreactors are used for processing large volume of culture for obtaining products of interest in sufficient quantities.Bioreactor is a large vessel in which raw material is biologically converted into specific product under optimal Lendition.Abioreactor provides the optimal conditions for acheiving the desired propduct by providing optimum growth conditions such as temperatures, pH, substrates,salts,vitamins, oxygen.
Popular Questions of Class 12th biology
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(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals. - Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
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- Q:- Explain the Law of Dominance using a monohybrid cross.
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(a) Abortions could happen spontaneously too. (True/False)
(b) Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner. (True/False)
(c) Complete lactation could help as a natural method of contraception. (True/False)
(d) Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/False) - Q:- Name the primary and secondary lymphoid organs.
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(a) Promoter
(b) tRNA
(c) Exons - Q:- Identify each part in a flowering plant and write whether it is haploid (n) or diploid (2n).
(a) Ovary _______________
(b) Anther _______________
(c) Egg _________________
(d) Pollen__________________
(e) Male gamete _______________
(f ) Zygote ___________________ - Q:- How does the transmission of each of the following diseases take place?
(a) Amoebiasis
(b) Malaria
(c) Ascariasis
(d) Pneumonia - Q:- Can we call human evolution as adaptive radiation?
- Q:- Differentiate the following and give examples of each:
(a) Innate and acquired immunity
(b) Active and passive immunity