HOLIDAY HOMEWORK (SUMMER BREAK)
SUBJECT-science(biology), class-ix
Session-2015-16
A.Short Answer Questions1.Do you agree “A cell is a building unit of an organism”.If yes,explain why.
2.How does a bacterial cell different from an onion peel cell?
3.Where do the lipids and proteins constituting the cell membrane get synthesised?
4.Differentiate between hypotonic,hypertonic and isotonic solution.
5.Draw a labelled diagram of a plant cell as revealed by an electron microscope.
6.What is diffusion?write its significance.
7.Why mitochondria and plastids are called semi autonomous organelles?
8.Why does the skin of your finger shrink when you wash clothes for a long time?
9.Name any cell organelle which is non-membranous.
10.Write the name of different plant parts in which chromoplast,chloroplast and leucoplast
are present.
11.Name the organelles which show analogy written as under
a.Control room of the cell
d.Digestive bag of the cell
b.Storage sacs of the cell
e.Packaging and dispatching unit of the cell
c.Kitchen of the cell
f.Transpoting channels of the cell
g.Energy currency of the cell
h.Protein factory of the cell
12.Why lysosomes are called natural scavengers and cellular house keepers?
13.Differentiate between organs and organelles.
14.Name the world’s largest and smallest cell.
15.Why do we stain cells while observing under microscope?
16.What is the advantage of multicellularity over unicellularity?
17.What are chromosomes made up of?
18.If you are provided with some vegetables to cook ,we generally add salt to it during
cooking process.After adding salt,vegetables release water.What mechanism is responsible
for it?
19.What are the different types of ER?Write their function.
20.What advantages does selective permeability of plasma membrane provide to the cell?
B.Prepare a Seminar Report on any topic of the chapter(ppt)
C.Prepare a investigatory project report on (any one) of the following
topica.Do cells of leaf peels of different plants look alike in shape,size and
structure?
b.Role of Diffusion in plants.
HOLIDAY HOMEWORK (SUMMER BREAK)
SUBJECT-science, class-vii
Session-2015-16
A.Short Answer Questions1.How is silk thread obtained from cocoon?
2.What is silk moth?
3.What is the food of sheep?
4.Name some important breeds of sheep found in different regions of India.
5.Why do caterpillars shed their skin when they grow bigger in size?
6.How silk was discovered?
7.Name the four chambers of the stomach of a ruminant.
8.What is pseudopodia?
9.How does amoeba capture food?
10.Why is grass digested by some animals and not by humans?
11.What is the importance of saliva in our mouth?
12.What is the role of Rhizobium in replenishing soil?
13.How does the pitcher plant trap insects?
14.Write the equation representing the process of photosynthesis.
15.What are lichens?
16.What is the function of mucous?
17.Write about feeding mechanism in starfish.
18.Why is silk obtained by mulberry silk moth is very popular?
19.What are the different types of teeth?write their functions.
20.What is the function of gall bladder and large intestine?
B.Prepare a investigatory project report on 10 economically important
plants found in your locality.
Points to be included in the reporta.Local name
b.Scientific name
c.Habitat
d.Importance of the plant
e.Which part of the plant is used?
C.Collect three small pieces of different types of silk cloth and pin it in
chart paper.
HOLIDAY HOMEWORK (SUMMER BREAK)
SUBJECT-Biology, class-xii
Session-2015-16
A.Very short Answer Questions1. Why does failure of testes to descend into the scrotum produce sterility?
2. Where is acrosome present in humans?write its function.
3. Write the location and function of sertoli cells in humans.
4. Mention the location and the function of Leydig cells in humans.
5. Mention the function of mitochondria in sperms.
6. Where does fertilisation takes place in human females?
7. What is graffian follicle?
8. Where are fimbrae located in human female reproductive system?Write its function.
9. Name the cells formed after meiosis I of primary oocyte?
10. Differentiate between morula and blastula.
B.Short Answer type Questions11.Draw a diagram of the structure of a human ovum showing plasma membrane and zona
pellucida.
12. Spermatogenesis in human males is a hormone-regulated process.Justify.
13. In which part of the female reproductive system do the following events takes placea.Release of first polar body
b.Release of second polar body
c.Fertilisation
d.Implantation
14. Write two differences between oogenesis and spermatogenesis.
15. Write the functions of seminal vesicle,prostrate gland and bulbourethral gland.
16. Cleistogamous flowers of Commelina are invariably autogamous.Mention its one
advantage and one disadvantage to the plant.
17. How can polyembryony be commercially exploited?
18. Describe the endosperm development in coconut.
19. Write three examples of floral rewards.
20. Differentiate between embryo of grass and embryo of bean.
C.HOTS21. Pea flowers produce assured seed sets.Give a reason.
22. Are parthenocarpy and apomixes different phenomena?Discuss their benefits.
23. Are pollination and fertilisation is necessary in apomixes?
24. Not all hydrophytes are pollinated by water.Justify by giving two examples.
25. Not all copulations lead to pregnancy.why?
D.Long Questions26. Give a schematic representation of oogenesis in humans.Mention the number of
chromosomes at each stage.
27. Trace the post –fertilisation events in a sequential order upto implantation of the embryo
in human female.
28. List the changes each part of the ovule undergoes to develop into a seed.
29. What happens to the blastocyst immediately after implantation?
30. Write a brief account on the structure and functions of placenta.
E. Prepare a project report on ” Different methods of Birth Control”.