Class 12th Biology 2015 Set3 Delhi Board Paper Solution
Explain the interpretation of Charles Darwin when he observed a variety of smallblack birds on Galapagos Islands.
Charles Darwin observed a variety of small black birds called finches. By observing their characteristics on the Galapagos Islands, he proposed his famous theory known as the 'theory of natural selection'.
In this theory, he gave the following postulates:
All organisms possess an enormous power of fertility. Food, space and resources are limited. There is a struggle for the existence within a species as well as between two different species. Nature will favour the survival of the fittest. No two individuals will be exactly identical except identical twins. Some variations will always exist. Darwin believed that variations will ultimately lead to the formation of new species.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:- Name any five hybrid varieties of crop plants which have been developed in India.
- 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:- Draw a well-labelled diagram of an antibody molecule.
- Q:-
Explain the following terms with example
(a) Co-dominance
(b) Incomplete dominance - Q:- Name the functions of the following.
(a) Corpus luteum
(b) Endometrium
(c) Acrosome
(d) Sperm tail
(e) Fimbriae - Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:- In which way have microbes played a major role in controlling diseases caused by harmful bacteria?
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- How did Hershey and Chase differentiate between DNA and protein in their experiment while proving that DNA is the genetic material?
- Q:- Draw a labeled diagram of male reproductive system.