Class 12th Biology 2013 Set1 Delhi Board Paper Solution
Question 13
Name two commonly used bioreactors. State the importance of using a bioreactor.
Answer
Two commonly used bio reactors are
(a) Simple stirred tank bioreactor
(b) Sparged stirred - tank bioreactor
Importance of Bioreactor
Large volumes of cultures (100 - 1000 litres) can be processed. Also bioreactor provide optimal conditions for getting the desired product by providing optimum growth conditions like temp, pH, substrate, salts, vitamins and oxygen.
Popular Questions of Class 12th biology
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Write a short note on
(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.
- Q:- What is DNA fingerprinting? Mention its application.
- Q:- Describe the structure of a seminiferous tubule.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- Q:- Explain the Law of Dominance using a monohybrid cross.
Recently Viewed Questions of Class 12th biology
- Q:- Suggest the aspects of reproductive health which need to be given special attention in the present scenario.
- Q:- Give three hypotheses for explaining why tropics show greatest levels of species richness.
- Q:- State True/False with explanation
(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:- What are the suggested reasons for population explosion?
- Q:- What is apiculture? How is it important in our lives?
- Q:- Amniocentesis for sex determination is banned in our country. Is this ban necessary? Comment.
- Q:- What are the measures one has to take to prevent from contracting STDs?
- Q:- Write critical notes on the following:
(a) Eutrophication
(b) Biological magnification
(c) Groundwater depletion and ways for its replenishment - Q:- Give an account of energy flow in an ecosystem.
- Q:- List the various abiotic environmental factors.