Holiday Homework Class XII

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Holiday Homework XII

HOLIDAY HOMEWORK

CLASS XII

 

COMPUTER SCIENCE

 

  1. What is the difference between object oriented programming and procedural programming?
  2. Write a c++ program for showing the concept of inheritance with constructor function.
  3. What do you understand by polymorphism?
  4. Write name of two member functions belonging to fstream class.

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BIOLOGY

1) upadate the class work and home work note book (ncert q/a) up to chp no-02)

2) revise the q/a up to the chp no03 (till the gametogenisis ncert book.)

3) prepare a project report on any one of the following topic individually and to be submitted on re-opening day of the school.

  1. A) a detailed study on the role of emasculation and bagging technique in plant breeding..
  2. B) a detailed study on the application of tissue culture technique in horticulture on commercial scale.

How to make the project/content of the project to be   studied as per the following heads

  1. I) contents (index)

Ii)  introduction

Iii) description of the technique.

Iv) application of the technique

  1. V) a survey on the technique pertaining to its practical applications.

Vi) realated photographs

Vii)   conclusion

Viii) bibliography

4) answer to the following questions in home work note book  and submit it on the reopening day.

01) the turkey usually produces females for several generations.how is this possible.

02   the meiocytes of an onion   plant contains 32  chromosomes , workout the number

of chromosomes found in its endosperm

03)  in whiptail lizards only females are born generation  after generation. There is no

males .  How is this is possible. Explain

04) name the types      of gametes            produced b y a) staminate flowers b) pistillate flowers

05) define artificial insemination

06) why a typical angiosperm embryo sac at maturity considered 8 nucleated and 7 celled ?.

07)

Write the scientific name for the followings 1)  morphologically and genetically similar individuals derived through asexual reproduction 2)   cyclical changes shown by seasonal breeders..

08) what are the two advantages of keeping beehives in flowering  seasons of a crop.

09)why both the male gametes present within a pollen grain required for fertilizing the same ovule of an angiosperm plant. ?

10)pea plant has 14 chromosomes in diploid state, what will be the ploidy level of its 1)  endosperm cell 2)  synergids

  1. How does the pollen grain of vallisnaria protect them?

12.) Mention the unique feature with respect of flowering and fruiting in bamboo species

13.) Draw  a labeled diagram of the sectional view of mature   po llen grain angiosperms, and  explain the function of any two of its parts

14) draw a well labeled diagram of dicot embryo; label the different parts of it.

15) trace the development of male gametophytefrom microspore mother cell in the

microsporangium in flowering plants.

16) draw a sketch of the l.s. of an anatropous ovuleof an angiosperm.

label any six parts other than funiculus and micropyle.

  1. Trace the development of female gametophytefrom megaspore mother cell in a flower.

give a labeled diagram of the final stage of femalegametophyte

18.) Explain what double fertilization is. In whichcategory plant does it occur

19).draw a neat and labeled diagram of thelongitudinal section of a pistil showing stages of

pollen germination, up to the fulfillment of the task of pollen tube.

  1. How does the pollen tube grow through thestyle? Explain briefly.

20)  name the pollinating agent of flowers like maizeand cannabis. Give any two

21) draw a labeled diagram of the following.characteristic feature of these flowers favoring

this kind of pollination

  1. T.s. of bilobed anther of an angiosperm
  2. Internal structure of a pollen grain of an angiosperm

22) trace the development of a megaspore mothercell of a flower into a mature ovule.

give a labeled diagram of the final stage

23) trace the events that would take place in a flowerfrom the time the pollen grain of

the same speciesfalls on the stigma up to the completion of fertilization

24).   What is apomixis and what is its importance?

25).what is triple fusion? Where and how does it takeplace? Name the nuclei involved

in triple fusion

26) differentiate between perisperm and pericarp.

27). What are chasmogamous flowers? Can crosspollination occur in cleistogamous

flowers? Givereasons for your answer

28) explain the structure of a maize grain with thehelp of a diagram. Why does the

maize flowerproduce enormous quantities of pollen grain?

29) what is syngamy? How does it differ from fertilization? Where does syngamy

occur?, with help of suitable diagram.. Explain the term oviparous, viviparous.

30) describe the various methods of asexual reproduction. Explain with labeled  diagram

31) a. Mention the property that enables the explants to  regenerate into a newplant

b.a banana plant is virus infected. Describe the method that

will help in obtaining healthy banana plants from the diseased plant

32) (a)draw a schematic diagram of a fertized embryosac of an  angiosperm

(b) describe the stages in embryo development in a dicot plant

33) a) diagramatically show the stages in the development of megaspore

mother cell tofrom a mature embryo sac in angiosperms.

  1. b) why is this type of embryo sac development called as monosporic

34)     banana  is a parthenocarpic fruit whereas, oranges show  . polyembryony. How are they different from

each other     with     respect to seeds

 

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MATHS

 

  1. Solve any 25 question of chapter matrix and determinant from r.d. sharma book.
  2. Prepare 2 ppt from chapter matrix and determinant.

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ACCOUNTANCY

 

Accounting for partnership firms

Fundamentals ( solve all practical questions)

Admission of partener ( solve all practical question )

t.s. grewals

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ECONOMICS

 

Solve the ncert question a ie

Unit -1 & unit – 2 (except ed)

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BUSINESS STUDIES

 

Solve the case study

Ques . Given from ch 1 & ch -2

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HINDI

  • निबंध –

१. बल मजदूरी

  • विमुद्रीकरण ( नोट बंदी )
  • बेटी बचाओ – बेटी पढाओ

२. हाल ही में पढ़ी गयी किसी एक पुस्तक की समीक्षा लिखिए .

३. रेलवे के आरछित डिब्बो में भी अवांछित तत्वों के  घुस आने से यात्रियों को हो रही अनेक प्रकार की समस्याओ का उल्लेख करते हुए चेयरमैन , रेलवे बोर्ड , नई दिल्ली को पत्र लिखकर अपने सुझाव प्रेषित कीजिये ?

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PHYSICAL EDUCATION

 

  • PRACTICE OF CHAPTER 2.
  • COMPLETE PRACTICAL NOTEBOOK

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PHYSICS

CHAPTER 1 AND 2

ELECTROSTATICS  (ELECTROSTATICS FIELD AND POTENTIAL)

ALL NCERT TEXT BOOK QUESTIONS

and

  1. What is the charge on Cu++ ?
  2. How does the drift velocity of electrons in a metallic conductor change if the length of the conductor is doubled by stretching it, keeping the applied potential difference constant?
  3. A carbon resistor is marked in colour bands of red, black, orange and silver. What is the

Resistance and tolerance value of the resistor?

  1. The given graph shows the variation of charge q versus potential difference V for capacitorsC1 and C2. The two capacitors have the same plate seperation, but the plate area of C2 is double that of C1. Which of the lines in the graph correspond to C1 and C2 and Why?

 

 

 

Q                             A               B

 

V

  1. Two wires X, Y have the same resistivity but their cross-sectional area are in the ratio 2:3 and lengths in the ratio 1:2. They are first connected in series and then in parallel to a d.c. source. Find out the ratio of the drift speeds of the electrons in the two wires for the two cases.
  2. State and Prove Wheatstone Bridge.
  3. State and Prove Gauss law.
  4. The flux of electrostatic field through the closed spherical surface S’ is found to be four times that through the closed spherical surface S. Find the magnitude of the charge Q. Given q1 = 1mC, q2 = -2mC, q3 = 9.84 mC.                                                                                [3]
  5. Derive an expression for the energy strored in a parallel plate capacitor. A parallel plate capacitor with air as dielectric is charged by a d.c. source to a potential V. Without disconnecting the capacitor from the source, air is replaced by another dielectric medium of the dielectric constant 10. State with reason, how does (i) the electric field between the plates and (ii) Energy stored in the capacitor change.
  6. Derive an expression for the resistivity of a conductor in terms of number of density of free electrons and relaxation time.

Or

A potential difference V is applied across the ends of copper wire of length L and diameter D.   What is the effect on drift velocity of electrons if:

(i) V is doubled                               (ii) L is doubled                                       (iii) D is doubled

 

PRACTICALS

The following practical and Activity are given to the Student of 12A, B, and E as a Holiday Homework to write in the Practical and Activity in the Practical Note Book.

 

                                         Section-A1.To determine resistance per cm of a given wire by plotting a graph for potential difference versus current.2.To find the resistance of a given wire using meter bridge and hence find resistivity (Specific resistance) of its material.3.To verify law of combination (series/parallel) of resistances using meter bridge.

4. To compare the EMF of two given primary cells using potentiometer.

5.       To determine the internal resistance of given primary cells using potentiometer.

6.       To determine the resistance of galvanometer by half deflection method and to find its figure of merit.

 

7.To convert the given galvanometer (of known resistance and  figure of merit) into voltmeter of desired range and to verify the same.

8. To convert the given galvanometer (of known resistance and  figure of merit) into ammeter of desired range and to verify the same.

 

ACTIVITY (SECTION-A)

1.       To measure resistance, voltage (AC/DC), current (AC), and check continuity of a given circuit using multimeter.

2.       To assemble a household circuit comprising three bulbs, three(on/off) switches, a fuse and a power source.

3. To draw the diagram of a given open circuit comprising atleast a battery, resistor/ rheostat, key ammeter and voltmeter. Mark the components that are not connected in proper order and correct the circuit and also the circuit diagram.

 

4. To assemble the components of a given electrical circuit.

5.To study the variation in potential drop with length of a wire for a steady current.

 

 

 
EXPERIMENT (SECTION-B)1.To draw the I-V characteristic curve for a p-n junction in forward bias and reverse bias.2.  To draw the characteristic curve of zener diode and to determine its reverse breakdown voltage.3.To study the characteristic of a common-emitter npn- pnp transistor and to find out the values of current and voltage gain.

4.To find the value of v for different values of u in case of a concave mirror and to find the focal length.

5.To find focal length of convex lens by plotting graph between u and v or between 1/u and 1/v.

6. To determine the angle of minimum deviation for a given prism by plotting a graph between angle and incidence and angle of deviation.

7.To find the refractive index of a liquid by using convex lens and a

 

 
.ACTIVITY (SECTION-B)1.       To observe polarization of light using two Polaroids.2.       To study the nature and size of the image formed by a :

(i)                  Convex lens (ii) concave mirror, on  screen by using a

a candle and a screen (for different distances of the candle

from the lens/ Mirror)

3.       To identify a diode, an LED, a transistor, an IC, a resistor and a capacitor from a mixed collection of such items.

4.       To study the effect of intensity of light (by varying distance of the source)on an LDR.

5.       To observe the lateral deviation of a beam of light incident obliquely on a glass slab.

 

 

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CHEMISTRY

 

  • NCERT EXERCISE QUESTION OF P BLOCK 15,16,17,18TH
  • PROJECT ( INDIVIDUALLY) AS PER THE COPER DISTRIBUTER
  • COMPLETE ALL IT EXPERIMENTS (SALT ANALYSIS) EXCLUDING OBSERVATION AAD PRELIMINARY EXAMINATION.

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15 Years of experience in the field of Education

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