CBSE Class 9 - Maths - Ch 14 - Statistics (NCERT Ex 14.3)

Statistics

Exercise 14.3

Question 1:

A survey conducted by an organisation far the cause of illness and death among the women between the ages 15 - 44 (in years) worldwide, found the following figures(in %):

S.no.	Causes	Female fatality rate(%)
1	Reproductive health conditions	31.8
2	Neuropsychiatric conditions	25.4
3	Injuries	12.4
4	Cardivasculor conditions	4.3
5	Respiratory conditions	4.1
6	Other Causes	22.0

(i) Represent the information given above graphically.

(ii)Which condition is the major cause of women's ill health and death worldwide?

(iii) Try to find out, with the help of your teacher, any two factors which play a major role ill the cause in (ii) above being the major causes.

Answer:

(i) By representing causes on x-axis and family fatality rate on y-axis and choosing an appropriate scale (1 unit 5% far y axis), the graph of the information given above can be constructed as follows:

In the graph, the rectangle bars are of the same width and have equal spacing among them.

(ii) As shown, Reproductive health condition is the major cause of women's ill health and death worldwide.

(iii) The factors are as follows.

1. Lack of medical facilities

2. Lack of awareness of  right medical treatment

Question 2:

The following data on the number of girls (to the nearest ten) per thousand boys in different sections of Indian society is given below.

CBSE Class 9 Maths - CH14 - Statistics (NCERT Ex 14.1 and 14.2)

Statistics (NCERT Ex 14.1 and 14.2)

NCERT Exercise 14.1

Question:1

Give five examples of data that you can collect from day to day life.

Answer:

In our day to day life,we can collect the following data.

1. Numbers of girl students per class in a school.

2. Number of cars of different models in our colony.

3. Production of rice in last 20 years in our country.

4. Rainfall in our city in the last 10 years.
5. Scores made by a team in Indian Premier League tournament.

Question:2

Classify the data in Q1 above as primary or secondary data.

Answer:

The information which is collected by the investigator himself with defined objectives is called as primary data whereas when the information is gathered from a source which already had stored, is called as secondary data.
Item 1 and 2 are the primary data where as the data in 3, 4 and 5 is secondary data.

Exercise 14.2

Question:1

The blood groups of 30 students of class VIII are recorded as follows:

A,B,O,O,AB,O,A,O,B,A,O,B,A,O,O

A,AB,O,A,A,O,O,AB,B,A,O,B,A,B,O.

CBSE Class 6-12 - Science - Fathers in Biology

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Fathers of Various Branches in Biology

Aristotle - Father of Biology
credits: wikipedia

Num.	Branch of Biology	Name
1	Father of Biology	Aristotle
2	Father of Zoology	Aristotle
3	Father of Botany	Theophrastus
4	Father of Taxonomy	Carl Linnaeus
5	Father of Plant Physiology	Stephen Hales
6	Father of Bacteriology	Louis Pastuer
7	Father of Microbiology	Leeuwenhoek
8	Father of Immunology	Edward Jenner
9	Father of Cytology	Robert Hooke
10	Father of Mycology	Micheli
11	Father of Genetics	G J Mendel
12	Father of Experimental Genetics	T. H. Morgan
13	Father of Bryology	Johann Hedwig
14	Father of Eugenics	Francis Galton
15	Father of Microscopy	Marcello Malphigi
16	Father of Bio-diversity	E.O. Wilson
17	Father of Medicine	Hippocrates
18	Father of modern Anatomy	Andreas Vesalius
19	Father of Radiation Genetics	H. J. Muller

CBSE Class 9 Science - Diversity in Living Organisms (Important Differences)

Diversity in Living Organisms

Evolutionary Tree
credits: wikipedia

Important Differences

Five classes of vertebrates are Pisces, Amphibia, Reptilia, Aves and Mammalia

	Pisces	Amphibia	Reptilia	Aves	Mammalia
Habitat	Aquatic	Both land and water	Some terrestrial, others aquatic	Terrestrial (aerial)	Usually terrestrial, few aquatic.
Skin	Covered with scales/plates	Smooth skin with mucus glands and lacking scales	Waterproof skin with scales	Mostly covered with feathers	Covered with hair and contains sweat and oil glands.
Body Temperature Control	Cold blooded	Cold blooded	Cold blooded	Warm blooded	Warm blooded
No. of heart chambers	2	3	3 (except crocodiles)	4	4
Respiration	Gills	Gills, lungs or skin	Lungs	Lungs	Lungs
Mode of Reproduction	Oviparous (egg laying)	Oviparous	Oviparous	Oviparous	Viviparous
Locomotion	Tail and fins	Limbs	Limbs	Wings	Limbs
Examples	Rohu, shark, sea-horse, sting ray	Frog, Toad salamander,	Crocodile, snake, turtle, lizard	Pigeon, ostrich, hen, duck	Human, whale, bat, lion

CBSE Class 9 - Science - Gist on Work, Energy and Power

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Study Points

1. Work is said to be done if a force is applied on the object and it is displaced from its original position.

2. Three things are necessary for the performance of work:

• There must be an applied force F.
• There must be a displacement x.
• The force must have a component along the displacement
  

3. The work done W by a force F on an object is
    W = Fd cos θ
    where d is the displacement of an object.
    θ is the angle between the force and the displacement.

4. If displacement is along the direction of work i.e. θ = 0°
    W = Fd


5. If displacement is opposite to the force i.e. θ = 180°
    W = -Fd

6. if the displacement is perpendicular to the force (i.e. θ = 90°), then work done is zero.

7. Work done on an object by a force would be zero if the displacement of the object is zero.

8. Work is a scalar quantity.

9. Unit of work is Joule (J).

10.  1 Joule = 1 newton × 1 metre = 1 Nm
11. One Joule of work is to be done on an object when a force of one newton displaces it by one metre along the time of action of the force.

CBSE Class 9: Science - CH3 - Gist on Atoms, Molecules and Ions

Atoms, Molecules and Ions

Study Points

1. The law of conservation of mass states that there is no detectable loss or gain in total mass of the substances in a chemical reaction.

2. Law of Conservation of mass was proposed by the French chemist Antoine Lavoisier (1774)

3. The Law of constant proportion or definite proportions states that all pure specimens of the same compound contain the same elements combined together in the same proportion by weight.

4. Law of definite proportion was proposed by Louis Proust (1799).

5. An atom is the smallest particle of the element which can take part in chemical change and it can exist independently and retain all its chemical properties.

6. The smallest particle of matter made up of two or more atoms, which can exist in free state, is called a molecule.

7. Law of definite proportion does not hold good when the compound is obtained by using different isotopes of the combining elements .

8. Each atom of an element shows all the properties of the element.

CBSE Class 9/10 - PSA Quiz (English)

 PSA Quiz

Q1: In the following there are six sentences marked as A, B, P, Q, R, S. Positions of A and B are fixed. You are requested to choose one of the four alternatives which would be the most logical sequence of sentences in the passage.

A) The similarity between the human body and a machine is rather superficial.
B) The points of difference far outweigh the points of resemblance.
P) Beyond that comparison fails.
Q) No machine grows in size; no machine sees , hears  or feels.
R) It can be summed up in the statement  that both require  fuel and oxygen  and obtain energy.
S) No machine thinks.

(a) SQPR
(b) RPQS
(c) RPSQ
(d) QSPR

Directions: (Q2 - Q6): Identify the word whose spelling is correct.

Q2:
(a) Profesional
(b) Proffessional
(c) Proffesional
(d) Professional


Q3:
(a) Schdule
(b) Shidule
(c) Schdulle
(d) Schdule

Q4:
(a) Intelligence
(b) Intilligence
(c) Intalligence
(d) Intelligance

Q5:
(a) asshaimed
(b) ashamid
(c) ashimed
(d) ashamed