Class 12 Biology - Chapter Biodiversity and Conservation NCERT Solutions | What is Red Data Book?
What is Red Data Book?
The World Conservation Union (WCU) which were primarily called IUCN (International Union of conservation of Nature and Natural resources) maintains a document in which it contains all the information about the species that are facing high risk of extinction is called Red list or Red Data Book. Species are classified mainly by the IUCN Red list into the nine groups which are based on the following factors: declining rate, population size, area of geographic distribution and degree of population distribution and at last fragmentation.
More Questions From Class 12 Biology - Chapter Biodiversity and Conservation
- Q:- What are sacred groves? What is their role in conservation?
- Q:- Give three hypotheses for explaining why tropics show greatest levels of species richness.
- Q:- The species diversity of plants (22 per cent) is much less than that of animals (72 per cent). What could be the explanations to how animals achieved greater diversification?
- Q:- How do ecologists estimate the total number of species present in the world?
- Q:- How is biodiversity important for ecosystem functioning?
- Q:- What are the major causes of species losses in a geographical region?
- Q:- What is the significance of the slope of regression in a species − area relationship?
- Q:- Can you think of a situation where we deliberately want to make a species extinct? How would you justify it?
- Q:- Among the ecosystem services are control of floods and soil erosion. How is this achieved by the biotic components of the ecosystem?
- Q:- Name the three important components of biodiversity.
Popular Questions of Class 12 Biology
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- What do you think is the significance of reproductive health in a society?
- Q:- Mention the advantages of selecting pea plant for experiment by Mendel.
- Q:- Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. - Q:- Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- Explain in brief the role of animal husbandry in human welfare.
- Q:- Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?
Recently Viewed Questions of Class 12 Biology
- Q:- Do eukaryotic cells have restriction endonucleases? Justify your answer.
- Q:- In our society the women are often blamed for giving birth to daughters.
Can you explain why this is not correct? - Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
- Q:- Explain the role of tapetum in the formation pollen-grain wall.
- Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:- What is primary productivity? Give brief description of factors that affect primary productivity.
- Q:- Which is a better mode of reproduction sexual or asexual? Why?
- Q:-
Practise drawing various animals and plants.
- Q:- Discuss with your teacher what does a suitable gene means, in the context of DNA vaccines.
- Q:- Why is reproduction essential for organisms? Answer
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