Class 12th Biology 2011 Set1 Delhi Board Paper Solution
Question 4
Name the event during cell division cycle that results in the gain or loss of chromosome.
Answer
Aneuploidy
Popular Questions of Class 12th biology
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Differentiate between a zoospore and a zygote.
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
- Q:- Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.
- Q:- Differentiate between gametogenesis from embryogenesis.
- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- Q:- Define
(a) Juvenile phase
(b) Reproductive phase
(c) Senescent phase. - Q:- Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
Recently Viewed Questions of Class 12th biology
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- Q:- What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
- Q:- Name the three important components of biodiversity.
- Q:- If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.
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- Q:- Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q:- Why is the offspring formed by asexual reproduction referred to as clone?
- Q:- Identify True/False statements. Correct each false statement to make it true.
(a) Androgens are produced by Sertoli cells. (True/False)
(b) Spermatozoa get nutrition from Sertoli cells. (True/False)
(c) Leydig cells are found in ovary. (True/False)
(d) Leydig cells synthesise androgens. (True/False)
(e) Oogenesis takes place in corpus luteum. (True/False)
(f) Menstrual cycle ceases during pregnancy. (True/False)
(g) Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/False) - Q:- What is meant by emasculation? When and why does a plant breeder employ this technique?
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