chapter 1 to 5 i.e.reproduction in organisms to basic principle of inheritance all important questions pdf

1. HOLIDAY HOMEWORK (2018-19)
CLASS XII (BIOLOGY)
A. Make a project file on the topic chosen and discussed by you in the class. Project file should
possess following details in sequence as provided:
a) Introduction page
b) Certificate
c) Acknowledgement
d) List of Contents
e) Content of project
f) Bibliography
B. Complete the practical record file.
C. ASSIGNMENT (CHAPTERS 1 – 4)
1. Which individuals can be termed as clones?
2. How do the following organisms reproduce: Paramecium and Penicillium?
3. Why is syngamy a major event in sexual reproduction?
4. What kind of structures is formed at the end of microsporogenesis and megasporogenesis?
5. How banana is a seedless fruit?
6. Why do hilly areas of Kerala, Karnataka and Tamil Nadu transform into blue stretches that attract
many tourists?
7. Define ‘oestrus’ and ‘menstrual’ cycles. Give one example of organisms of each
8. What are heterogametes and homogametes?
9. State any one advantage and disadvantage of pollen grains to humans.
10. Mention the different stages of sexual reproduction.
11. Describe the structure of an anatropous ovule with a neatly labeled diagram.
12. What is cleistogamy? Why are cleistogamous flowers invariably autogamous?
13. Explain the technique of carrying out controlled pollination
14. Give any three differences between asexual and sexual reproduction.
15. Enlist the changes that occur post- fertilization in plants.
16. Explain microsporogenesis in detail with the help of neat labelled diagrams?
17. Which type of pollination ensures the arrival of genetically different pollen grains to stigma?
18. What is cryptorchidism?

2. 19. Name the different parts of fallopian tube.
20. Define parturition.
21. What is sporopollenin?
22. Why pollen grains can remain well preserved as fossils?
23. Explain the stages involved in the maturation of a microspore into a pollen grain.
24. What relationship exists between a species of moth and Yucca plant? Explain.
25. What is triple fusion? Where does it occur?
26. Why do most zygotes develop after certain amount of embryo is formed?
27. Differentiate between microsporogenesis and megasporogenesis.
28. What do you understand by double fertilization?
29. What is polyembryony and apomixes? Name some examples
30. Explain the development of embryo in a dicotyledonous plant with neatly labelled diagrams.
31. Describe the structure of a sperm with a diagram.
32. What is feedback mechanism? Explain its role in hormonal control of spermatogenesis’ in human
male.
33. Define mortality rate.
34. Name the type of cross pollination in Vallisneria & Bougainvillea.
35. Tapeworms posses both male and female reproductive organs. What is the name given to such
organism? Give two more examples of such organisms.
36. Enlist any two functions of a female placenta.
37. Expand MTP and ICSI.
38. Name one plant each where plants have been adapted for pollination with the help of
a. Water b) wind
39. Describe the structure of a pollen grain with the help of a well labelled diagram.
40. Why are male testes located outside the abdominal cavity?