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Class 11 Session Ending, Final Examination Paper Download.
7 Mar 2017
Session Ending Examination March 2017 Class 11 All Subject Question Papers.
Class 11 Session Ending, Final Examination Paper Download.
25 May 2016
CBSE BIOLOGY PRACTICAL QUESTION PAPER CLASS 11
CBSE BIOLOGY PRACTICAL QUESTION PAPER CLASS 11
SESSION ENDING EXAMINATION
Biology Practical
Class XI
Question Paper
Time : 3 Hrs. MM: 30
Q.1.
To prepare a temporary slide of upper and lower surface of leaf to study
distribution of stomata. Write material required, diagram, observation and
inference. 5
Q.2.
To study the anatomy of dicot stem from permanent slide. Draw diagram and
describe various anatomical features. 5
Q.
3. To separate the photosynthetic pigments by paper chromatography. Write Material required, Diagram and
observation. 5
Q.
4. Identify the spotting A,B, C & D.
Write Name, Two points of identification and classification of each. 7
Q.5
Practical Record and Viva voce 2+2
Q.6.
Project and Viva voce. 3+2
*******
AISSCE CBSE BIOLOGY PRACTICAL QUESTION PAPER CLASS 12
ASSCE CBSE BIOLOGY PRACTICAL QUESTION PAPER CLASS 12
AISSCE EXAMINATION
Biology Practical (044)
Class XII
Question Paper
Time : 3 Hrs. MM: 30
Q.1. To prepare a slide and study the
pollen germination on slide. Write material required, diagram, observation and
inference. 5
Q.2. To study the water holding capacity of
soil collected from two different sites. Write material required, diagram,
observation, results and precautions. 4
Q. 3. Set up an experiment to study the
presence of suspended particulate matter in air at the two different sites.
Write Material required, diagram observation. 5
Q. 4. Identify the spotting. Write Name,
Two points of identification and classification of each. 7
Q.5 Practical Record and Viva voce. 4
Q.6. Project and Viva voce. 5
*********
12 May 2016
HOLIDAY HOMEWORK FOR SUMMER VACATION 2016
HOLIDAY HOMEWORK (SUMMER VACATION- 2016)
Class 9 Biology
Chapter: Tissues
Class 10 Biology
Chapter: Control and Coordination
25 Aug 2014
Ebola - Signs and Symptoms
Ebola first appeared in 1976 in 2 simultaneous outbreaks, in Nzara, Sudan, and in Yambuku, Democratic Republic of Congo. The latter was in a village situated near the Ebola River, from which the disease takes its name.
Key facts
- Ebola virus disease (EVD), formerly known as Ebola haemorrhagic fever, is a severe, often fatal illness in humans.
- EVD outbreaks have a case fatality rate of up to 90%.
- EVD outbreaks occur primarily in remote villages in Central and West Africa, near tropical rainforests.
- The virus is transmitted to people from wild animals and spreads in the human population through human-to-human transmission.
- Fruit bats of the Pteropodidae family are considered to be the natural host of the Ebola virus.
- Severely ill patients require intensive supportive care. No licensed specific treatment or vaccine is available for use in people or animals.
Symptoms of Ebola typically include
- Fever (greater than 38.6°C or 101.5°F)
- Severe headache
- Muscle pain
- Weakness
- Diarrhea
- Vomiting
- Abdominal (stomach) pain
- Lack of appetite
Symptoms may appear anywhere from 2 to 21 days after exposure to ebolavirus, although 8-10 days is most common.
Some who become sick with Ebola are able to recover. We do not yet fully understand why. However, patients who die usually have not developed a significant immune response to the virus at the time of death.
For More Detail: Click
http://www.who.int/mediacentre/factsheets/fs103/en/
http://www.cdc.gov/vhf/ebola/
30 May 2014
Causes of Breast Cancer in Human
Causes of Breast Cancer
The body's cells reproduce themselves throughout your lifetime, as tissues wear out and their cells are replaced in a controlled manner. Breast cancer - like all cancers - occurs when that control is lost and cells begin to divide at an unusually high rate.
No single trigger or cause has been identified for breast cancer. Certain risk factors exist, though, that increase a woman's chance of developing it:
- age - it's more common in women over 50
- family history - if a woman's mother or sister had the disease before menopause, this is occasionally associated with one of two genes linked to breast cancer
- previous breast cancer
- family history of ovarian cancer
- age of pregnancy - women who haven't had children, or whose first child was born after age 30
- age of menstruation - starting periods at a young age (under 12 years old)
- entering menopause later (over age 55) increases breast cancer risks
- recent research suggests that women who start smoking regularly within 5 years of the onset of their menstrual periods are 70% more likely to develop breast cancer before the age of 50 than non-smokers
- having dense breast tissue
- radiation treatment to the chest, especially before 30 years of age
- alcohol consumption contributes to the risk of breast cancer
- hormone replacement therapy (HRT; estrogen plus progesterone) increases the risk of breast cancer slightly after 5 years of therapy
- oral contraceptives increase risks slightly, if used over many years
- obesity with excess caloric and fat intake
The increased risks of getting breast cancer associated with the above factors are often statistically quite small. In fact, for most women, the only risk factor they have is being over 50 years of age. Any concerns should be discussed with your doctor.
2 May 2014
12 Feb 2014
CLASS 10 SA 2 SCIENCE QUESTION PAPERS
Click the following links to Print the SA 2 Science Question Papers For Class X
4 Feb 2014
Class 10 Home Assignment Chapter : Our Environment
Click below to Download:
1. Define biodegradable wastes. (1 mark)
2. Define decomposers. Name one decomposer. (1 mark)
3. Which of the following belong to the same trophic level?
Tree, Frog, Snake, Grass, Lizard. (1 mark)
4. Name the group of chemical compounds which damages the ozone layer. (1mark)
5. What would happen if all the decomposers were eliminated from the Earth? Explain with
reasons. (2 marks)
6. Give an example of a food chain operating in fresh water pond. Mention the food habit of
each trohic level
in
this food chain. (2 marks)
7. Consider the food chain: Grass à Deer à Lion.
What will happen, if lions are removed from the above food chain? (2 marks)
Click below to Download:
Class 9 Home Assignment Chapter : Natural Resources
Click below to Download:
1. Biotic components of biosphere is
not
constituted by –
(a) Producers (b) Consumers (c) decomposer (d) air
2. Major source of
mineral in soil is
the –
(a) Parent rock
from which soil is
covered (b) Plants
(c)
animals (d)
bacteria
3. One of the following factors does not lead to soil
formation in nature
(a) the sun (b)
water (c) wind (d) polythene bags
4. The nitrogen molecules present in air can be converted into nitrates and nitrites by –
a) a biological process of nitrogen fixing bacteria present in soil b)
a biological process of carbon fixing factor present in soil
c) any of the industries manufacturing nitrogenous compounds.
d) The plants used as cereal crops in field
Click below to Download:
22 Jan 2014
MARKING SCHEME SECOND PRE-BOARD EXAMINATION 2013-14
Section A
1.Flowers
once in 12 years
1
2. (i) 24 (ii) 36
(1/2 each)
3. 25% 1
4.
Analogous organs /same function ,
Convergent evolution (1/2 each)
5.Latex
of poppy plant (Papaver somniferum)
Depressant
and slow down body functions
(1/2 each)
6. Ethidium bromide 1
7. Meristem, It is
free of virus (1/2 each)
8.a.Parasitism b. Commensalism (1/2 each)
9. (i)
Leydig cells - found in interstitial spaces between seminiferous tubules ,
secrete
androgens / testosterone =½ + ½ = 1
(ii)
Sertoli cells -found in between spermatocyteinside seminiferous tubules,
nourish
developing spermatozoa / sperms / germ cells =½+½= 1
10.Saheli
is nonsteroidal ,once a week pill,with high contraceptive value and very less
side
effects.
(1/2 x 4=2)
Or
Be easily
available, effective and reversible with little or no side effects, user
friendly,
not
interfere with the sexual drive of the user or any other. (1/2 x 4=2)
11.Birds-Female is heterogametic and
male is homogametic
ZZ-ZW mechanism
Humans-Female is homogametic and male is
heterogametic
XX-XY mechanism
Egg 1+1=2
12. a)
Salmonella typhi
b)
Streptococcus pneumoniae
c)
Wuchereria bancrofti and Wuchereria malayi
d)
Entamoeba histolytica ½×4=2
13.a.Spirulina
1
b.Methanogens , cellulose (1/2 + 1/2 )
14 Flocs-Masses of bacteria
associated with fungal filaments to form mesh like structures.
These microbes consume the major
parts of the organic matter of the effluent.
This significantly reduce the
BOD. The sewage water is treated till the BOD is reduced.
After the treatment the bacterial flocs
are allowed to sediment. This is called activated sludge. (0.5+ 1+0.5)
15.Streptokinase-bacteria
Streptococcus-clot buster. (1/2 + 1/2 )
Cyclosporin A- Trichoderma polysporum- Immunosuppressant (1/2 + 1/2
)
16. DDT neither excreted nor
metabolized and keeps accumulating in the food chain,
interferes
with Calcium metabolism, decline in bird population / due to thinning
of egg
shell / premature breaking of eggs, bio-magnification. 1+1/2 + 1/2 =2
17.Sporozoites.
Release of toxin haemozoin. (1+1
18. Continuous close inbreeding for
several generations, reduces fertility and productivity
is
called inbreeding depression =½+ ½
Advantages-
produces pure lines / eliminates inferior genes , accumulation of superior
GenesAny
one [1 + 1 = 2marks]
19. Nucleosome
a=DNA
b=H1 histone
c=Octamer of
histone
Non histone
chromosomal Proteins. These are an additional set of Proteins that are required
for packaging of chromatin at higher level. (1/2 each=2)+1
20. Pg 48 Fig 3.6 NCERT (1.5 for labeling+1.5 for function)=3
Or
Pg 48 Fig 3.6 NCERT (2 flow chart + 1for life phases) =3
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