HOLIDAY HOMEWORK FOR CLASS 12TH BIOLOGY 1. Prepare an investigatory project on the topics given below: (i) Water quality in different parts of Delhi. (ii) Polycystic ovaries (iii) Silent heart attack (iv) Beating heart surgery (v) Effect of sugar on longevity of cut flowers (vi) Bio-medical wastes (vii) Analysis of honey for different minerals and carbohydrates (viii) Extraction of bio-diesel from vegetable oils (ix) How to prepare paper from water hyacinth? (x) Effect of UV rays on fermentation (xi) Ectopic pregnancy (xii) cervical spondylosis. REQUIREMENTS • Project file • Detailed research • Innovative ideas • innovative presentation

. ssignment ChaPter I

1) Cucurbits are referred to as monoecious explain'why ?

2) why do internodar segments of sugarcane fairto propagate vegetativery even when they are in contact

with damp soil? : , '

3) What is the role of bryophyllum in asexual reproduction ?

4)CoconutPalmismonoeciouswhiledatepalmisdiobcious.Whyaretheycalledso?

5)Defineexternalfertilization.Mentionitsdisadvantages'

6)Define:1)JuvenilePhase2)ReproductionPhase3)SenescentPhase.

7\ write the modes of asexuar reproduction in the foilowing o.rganisms-sycon, Pdnicillium, Marchantia'

g) Describe how the organisms maintain chromosome numbers during murtiprication by sexual

reProduction'

g) Name any one bird polfinated frower and mention one important characteristic of such a frower'

a

1O) Name two abiotic agencies of pollination'

11) offspring formed due to sexuar reproduction have nbtter chances of survival,why? ls this statement

alwaYs true'

12) How does the progeny formed from asexuar differ from those forms by sexuar v reproduction?

13) Digtinguish fission from budding'

14) Define parthenogenesis.Mention the two main types parthenogenesis giving suitable examples'

1s) rn certain simpre prants why mare gametes are produced in rarger numbers as compared to female

gametes ?

a

16) Describe Modes of asexual reproduction in animal'

17)Wheredoessyngamyoccur?Whatisthesignificanceofsyngamy?

18) Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?

19) Describe post fertilization changes in a flower

20) How do organisms maintain chromosome number during murtip,cation by sexuar reproduction ?

nnpnouf#ffi"t"iHi'"J[Y#]Ioo*"'

1) If the diploid number of chromosomes of an angiospermic plant is 20, what number would you expect in the

embyo and endosPerm of that Plant'

At what stage pollen grains are shed from anther? '

Name the 1't cell of male gametophyte and 1't cell of female gametophyte'

How are cleistogamous flowers different from chasr{gElnous flowers?

2)

3)

4)

5)

6)

7)

B)

e)

10)

11)

12)

13)

r4)15)

16)

t7)

r8)

3) Dicot embrvo

1q) -mn{tl*.',,*#"Xt::}ir:?"ther

cell in a flower ? rracethe deveropment orthis cell into a

L7 ) ;;il;

"rt" it'"'i"t' is ready for germination'\

zo) what is ag ';;p*;i-H;* i, i;;iii;;;r,irro* parthenogenesis and parthenocarpv?

Define self incom PatibilitY'

Define triple fusion. what is the product of this process e,w4twhat does the product develop into?

Whathappenstoendosperminmatureseedsofpea'been'grain&sunflower?

what will be the ploidy of the cells of nucellus, MMc, functional megaspore & female gametophyte?

Both wind & water pollinated flowers are not very colourful & do not produce nectar' what would be the

reason for this?

Is there any relationship between nurnber of'ovures in an ovary and number of seeds present in a fruit?

What is the significauce of pollination?

Give two examPles of each

1) anemoPhilous Plants2) hydroPhilous Plants3 )entomorPhilous Plants

o,ffiH?|i1f#tn exine should be hard? what is the tunction of germ pore?

;it.";; ioflen pistil interaction' How IS IT USEFUL?

what do you *.#;;;;;;sporic.development of female gametophvte?

Incompatibilty is , "'*'f barrier in fusion of gametes' Justiff'

What do the following parts from il l fruit and seed?

a) ovary wallb) outer integnments c) i integnments

d)zygotee) owle 0 PEN

D agrams

1) t* t"b" and two male gametes

2)

BIOLOGY ASSIGNMENT - CLASS XII

1. Name the hormones involved in regulation of spermatogenesis.2. How do leydig cells help in the process of spermatogenesis?i" How is spermatocytogenesis difierent from spermiation..4. Where does fertilisation take place?5. Mention the function of endometrium.5. What structure forms corpus leteum and at what stage? Name the two hormones secreted by it.!. Which hormones stimulate secretion of ovarian hormones? What would happen if the blood concentration of:, ovarian hormone increases? '8. Mention functions of following: (a) Corpus luterum (b) Acrrsome (c) Fimbriae (d) Scrotum9. Explain the role of following hormones with reference to hormonal control of human male reproductive system

, (i) G"RH (ii) LH (iii) FSH (iv) lnhibin (v)Testoserone

i0. How is blastula different from morule?L1,. Name the types of cells present in the inner lining of seminiferous tubules. What are their functions?

L2. When do morphogenetic cell movements take place?

;3. How does colostrums provide inertial protection against diseases to new born infants. Give one reason.

n4- How does spermatozoa move through vasa efferntia and the epididymis?15. Represent diagrammatically the various events during a menstrual cycle.16. What are the major components of seminal plasma?

:7. How is polyspermy prevented?;t8. At what stage of life is oogenesis initiated in a human female? When does the oocyte complete oogenesis?19. Give reasons:. a) Parturition is also termed labour.

b) Early secretions from mammary glands of mother are very usefulto newly born baby.,, c) Testes are lodged in the scrotum so as to lie outside the abdominal cavity.20. Describe the accessory ducts of human female reproductive system.

Reproductive Healthi. Reproductive health refers only to healthy reproductive functions. Comment.7. Comment on RCH programme of the government to improve the reproductive health of the people.3. The present population growth in lndia is alarming, suggest ways to check it.4. STDs can be considered as self invited diseases. Comment.5. Mention the primary aim of ART programme.

S. What is the significance of progesterone - estrogen combination as a contraceptive measure?1. Males in whom testes fail to descend to the scrotum are generally infertile. Why?:i. Mention two advantages of lactational amenorrhoea as a contraceptive method.9. Cu - ions releasing lUDs are more efficient than the non medicated methods. Why?,,:.0. What are the probable factors that contributed to population explosion in lndia?11" - Briqfly explain the IVF and ET. What are the conditions in which these methods are advised?12. What are the conditions in which medical termination of pregnancy is advised?13. Which substances are present in birth control pills?1'4. STDs are a threat to reproductive health. Describe any two such diseases and suggest preventive measures.15. Do you jystify the statutory ban on amniocentesis in our country? Give reasons.16" What is amniocentesis technique? Give its use. How has this technique been misused?1.7 " At what stage is the embrio implanted in the uterus of mother in case of test tube baby?18" Explain in brief the permanent methods of sterilisation.

FIB

i9. ln the human femaie menstruaiion can be deferred by administration of which hormone"10" Function of copper T isr, l-. Oral contraceptives are prescribed in females to e heck2..2. July 11 is observed as _ day.23. HIV is classified as a retrovirus because its genetic information is carried in:,4. Diaphragms are meant for?-5. Tubectomy is a method of sterilisation in which7.6" The hormone releasing IUD is1-7. MTP is considered safe upto how many weeks of pregnancy