Class 12th Biology 2011 Set1 Delhi Board Paper Solution
Question 3
Write the unit used for measuring ozone thickness.
Answer
Thickness of ozone is measured in terms of Dobson unit (DU).
Popular Questions of Class 12th biology
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- 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.
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- 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
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- Q:- Differentiate the following and give examples of each:
(a) Innate and acquired immunity
(b) Active and passive immunity - Q:- Briefly describe various steps involved in plant breeding.
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(a) Dominance and Recessive
(b) Homozygous and Heterozygous
(c) Monohybrid and Dihybrid. - Q:- Give three hypotheses for explaining why tropics show greatest levels of species richness.
- Q:- Removal of gonads cannot be considered as a contraceptive option. Why?
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(a) Origin of replication
(b) Bioreactors
(c) Downstream processing