XII Bio - Baylling HSS

harpyshelfBiotechnologie

12 déc. 2012 (il y a 8 années et 7 mois)

895 vue(s)

Biology

Paper

I

(Theory)

(Botany Zoology)

Three hours

(Candidates are allowed additional 15 minutes for only reading the paper. They must not start writing
during this time)

Answer all the questions in part I and five
questions from part II. Choose

THREE questions from section A
and two questions from section B. The intended marks for questions or part []

PART

I (
40marks)

Answer all questions

Question 1

a.

Read the following questions carefully. For each question there are four alternatives A,B,C and
D.

Choose the correct alternative and write it in your answer sheet.



[5]

i.

Which one of the following plants shows chloroplast dimorphism?

A.

Wheat B. Rice

C.Sugar beet D. Sugar cane


ii.

Floweri
ng suppressed

in deficiency of……………

A.

Nitrogen B. Phosphorus

C.calcium D.Sulphur


iii.

The neurotransmitter for sympatric nervous system is……………..

A.

Noradrenalin B. Adrenalin

C.Acetyle choline D. PABA


iv.

Occurrence of excess urea in blood
due to kidney failure is……………..

A.Urochrome B. Ureamia

C. Urecotilism D. Ureotelism

v.

Surgical removal of thymus of a new born shall result in failure to produce

A.

Monocytes B. B
-
ly mphocytes

C.T
-

Lymphocytes D. Basophils

B. Comple
te

the

following statements by
choosing the

correct alternatives
from those given in
brackets. Write only the correct answer in your answer sheet. Do not copy the whole
sentence.



(5)


I.The

osmotic pressure of mesophil cells are………….


(4 atm, 10atm, 20 atm)

ii. The soil
bacteria converts ammonia converts ammonia in to nitrite is………..


(Rhizobium
, cyanobacteria,
Nitrosomonas)

iii. The stress hormone in plants that functions during drought is …………………


(GA
,
IAA
,

ABA
)

iv. Sheath nuclei or
Schwan cells and node of Ranvier are found in…….


(Osteoblast
,

Neuron
,

Mylinated nerve fibre)


v
.The

outer layer of blastula formed of…………….

(Ectoderm, Tro
phoectoderm
,

Blastoderm)

C.

G
ive reason for the following statements.


(
4
)

i
.

The muscles in the body are anta
gonistic in nature

ii.
Neutrophils are most numerous and physiologically
most important.

iii.
The terms long day and short day plants are actually misnomers

iv. Psychotropic drugs are called mood
-
altering drugs.

d.
Differentiate the following pair with one

significant function
.


[5]

i. Carcinogen and allergen

ii. Rheumatoid arthritis and osteoarthritis

iii. Adaptive radiation and adaptive convergence.

iv
. Albuminous seed and exalbuminous seed

v
.Antibiotics

and Antibodies.









e. Match

I

[2]

Column A


Column B


i.Open

collateral Vascular bundle


ii.Closed collateral vascular bundle


iii.Amphicribal vascular bundle


iv. Bicollateral vascular bundle



a. Monocot stem

b.Dicot stem

c.
cucurbita

d. fern

e. Nerium


Match
-
II

[2]






Column A

(Diseases)

Column B

(Causative agent)

1.

Plaque

a.

Treponema pallidum

2.

Syphilis

b.

Plasmodium

3.

Mumps

c.

Pasteurella pestis

4.

Malaria

d.

Paramyxo virus

e.

Rubella virus


F.
G
ive the scientific term for the following



[
4
]

1.
The

absorption of water by hydrophilic surface of solid materials.

2.
The

agent used to make available of certain heavy elements in culture medium.

3. An eye defect due to irregul
ar curvature of cornea.

4.
The

fi
rst cell formed from coacervate
.


g.
Elaborate

the followings.



[2]

i
. EEG.

ii. SCID
iii
. DBP

iv. ELISA


h.
Define the following
.



[
4
]

i. Hydroponics

ii. Amphimixis

iii. Vernalization

iv. Heterosis

I
.

Give the contribution of the following scientists
.




[2]

i.

Edward Jenner

ii.

T.R. Malthus

iii.

Ronald Ross

iv.

Nitsch


J. Mention the most significant function of the followings
.



[5]

i. NMR

ii. Interferon

iii.
Pheromon
es

iv Gastrin

v.
Micropyle.







PART II

Section A (30 marks
)

Answer any three questions.

Question 2.

a.

Explain Kranz anatomy? How do you prove the C4 plants are better
photo synthesizers

with C4 cycle?



[4]

b.

Explain briefly various forms of ovules with diagram?



[
3
]

c.

Define
gametogenesis.
point out the main differences between spermato
genesis and
oogenesis



[
3
]


Question 3.

a.

Explain the process of selective absorption in the kidney?




[4]

b.

Describe about the structure and organization of shoot apex with help of Tunica
-
Corpus theory and Histogen theory



[4]

c.

Write any four function of thyroid hormone?




[2]


Question 4

a.


Give short notes on double fertilization.


[2]

b.

What is action potential
?

Describe how the nerve impulse is propagated in a
non
-
myelinated and myelinated nerve fibre.



[
4]

c.

Describe the process of symbiotic biological nitrogen fixation?



[4]

Question 5.

a.

How do
guard cells

control opening and closing of
stomata? Explain

[4]

b.

Briefly describe about the pulmonary exchange

of gases. [3]

c.

Give short notes on cardiac cycle

[3]


Question 6

a.

Write a short notes on salivary glands and their functions in the digestion


[
4
]

b.

What are
fetal

membranes? Give their names and function



[
3
]

c.


Briefly describe about the Went experiment on oat coleoptile


[3]


SECTION
B
(
30

MARKS
)

Answer any two questions

Question 7


(
a
)
.

Is

the first or
ganism aerobic

or anaerobic? Give reason



[2]

(b). What is micro propagation? Give its advantages.


[3]

(c ). Mention the differences between the primitive earth

atmosphere and present earth
atmosphere.



[3]

(d).
D
escribe about the chemical evolution with the help of Miller and Urey e
xperiment. [4]

(e).
Describe the steps in hybridization technique?



[3]

Question
8

(a).

B
riefly describe about the

Lamarckism
.
Give any two criticism of Lamarckism?




[4]

(b)
.
Give the

important characteristics of
Australopithecus?


[2]

(
c)
. How the study of fossil has helped in convincing the scientists that organisms have come
into the existence through evolution? How the age of a fossil can be determined?


[4]

(d)
. Discus

about

the concept of IPM.



[3]

(e).
D
ifferentiate connecting link and missing link


[2]

Question 9.

(a)


Write about the role of genetic engineering in
biosynthesis of

human insulin hormone?



[
4]

(b)


Differentiate humoral and

cell
-

mediated immune system?


[2]

(c)

Is alcohol a stimulan
t? Why? Give the effects of alcohol



[3]

(d)

Mention some preventive measures taken by health services to avoid spreading of
contagious diseases?



[4]

(e)

Write any two uses of EEG?

[2]




Question 10

a.

Write short notes on



[
15]

i
. Genetic counseling

ii
.
Alkaptoneuria

iii. Rh
incompatibility

iv.Test tube babies

v.

G
-
6PD

deficiency is resistant to malaria