CBSE Class 9 - Cell Biology - 7 Points about Plasmolysis (#cbsenotes)(#eduvictors)

Cell Biology - 7 Points about Plasmolysis

Plasmolysis vs Flaccid vs Turgid
Credits: Wikimedia, Author: LadyOfHats

1. When a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis
(plasma → fluid; lysis → disintegration, decomposition).


2. Only living cells, and not dead cells, are able to absorb water by osmosis.


3. Cell walls permit the cells of plants, fungi and bacteria to withstand very dilute [hypotonic] external media without shrinkage.

CBSE Class 9 - Chemistry - Matter in Surroundings - Short Questions Answers (#cbsenotes)(#eduvictors)

Chemistry - Matter in Surroundings

Short Questions Answers

Q1: Define matter.

Answer: Anything that has mass and occupies space is called matter.

Q2: Write your observation and conclusion for the following:
(a) When few marbles are put in a glass half filled with water.
(b) Ice is kept at room temperature.

Answer:
(a) Take some marbles and put them into the water of glass tumbler one by one. After some time you will notice that the water level crosses the mark and rises. This is because the marbles occupy space. Again weigh the glass with the marbles. You will find that the second mass is greater than the first one. This proves that marbles have mass.

Class 9 - Biology - Improvement in Food Resources - Agriculture Improvements (Very Short Questions and Answers) (#cbsenotes)(#eduvictors)

Improvement in Food Resources - Agriculture Improvements 

(Very Short Questions and Answers) 

Q1: Define crop.

Q2: Name the two major problems for food requirements due to overpopulated country like India?

Q3: Give two examples of scientific management practices to obtain a high yield of crops.

Q4: What are integrated farming practices?

Q5: Give three examples of cereals? Which type of major nutrient do they provide?

Q6: Lentils are rich in ________. Lentils, black gram (urad), green gram (moong) are collectvely called _________.

Q7: Give three examples of oilseeds? Name the major nutrient provided by them.

Q8: What do vegetables, spices and fruits provide?

Q9: What are fodder crops? Give three examples of fodder crops.

Q10: Define photoperiodism. What is its effect on plants?

Is Matter Around Us Pure? - Worksheet - CBSE Class 9 Chemistry (#cbsenotes) (#eduvictors)

Is Matter Around Us Pure?

Worksheet

Fill in the blanks

1. Anything which has mass and occupies space is called ________.

2. Matter can be classified as ____ substances or mixtures

3. A/An _______ is a basic form of matter which cannot be broken down into simpler substances by any physical or chemical means.

4. _____ are one category of elements that have lustre, conduct heat and electricity and are sonorous.

5. ________ are elements having properties intermediate between those of metals and non-metals

CBSE Class 9 - Chemistry - Matter in our surroundings - Revision Assignment (#cbsenotes)(#eduvictors)

Matter in our surroundings 

Revision Assignment

Q1. What is the physical nature of matter?

Q2. What are the characteristics of particles of matter?

Q3. Why do the particles mix faster in gases than in solids or liquids?

Q4. Why can you smell an incense stick in the whole room even if it is lit in one place?

Q5. Comment on the properties of matter in tabulated form keeping in mind the rigidity,  compressibility, kinetic energy,  fluidity and density.

Class 6/7/8/9/10 Entrance Tests/NTSE/CTET/NDA - General Science Quiz (2018) (#eduvictors)

General Science Quiz 

Q1: Which of the following is not example bio-mass energy source?

(a) Wood
(b) Gobar gas
(c) Atomic energy
(d) Coal


Q2: The scientific study of earthquakes is known as 

(a) Seismology
(b) Cosmology
(c) Ecology
(d) Pathology


Q3: Which of the following is a plant hormone?

(a) Insulin
(b) Thyroxin
(c) Estrogen
(d) Cytokinin

CBSE CLASS 9 - BIOLOGY - CELL: FUNDAMENTAL UNIT OF LIFE (Worksheet)(#cbsenotes)(#eduvictors)

CELL: FUNDAMENTAL UNIT OF LIFE 

(Worksheet)

Fill in the blanks with suitable words.

1. The fundamental organizational unit of life is the _______.


2. Cells are enclosed by a plasma membrane composed of ________ and _______.


3. Plasma membrane is a __________ permeable membrane.


4. In plant cells, a cell wall composed of _________ is located outside the cell membrane.


5. In prokaryotes, the nuclear membrane is ________.

CBSE Class 9 - Science - Chapter – 1 – Matter in our Surroundings (Revision Assignment) (#cbsenotes)(#eduvictors)

Chapter – 1 – Matter in our Surroundings

(Revision Assignment)

Q1. Why are gases so easily compressible whereas it is almost impossible to compress a solid?


Q2. Explain why diffusion occurs more quickly in a gas than in a liquid.


Q3. Explain why glycerine is more viscous than water.


Q4. Give reasons for the following –
(a) Milk is called a liquid
(b) Carbon dioxide is a gas


Q5. Both sugar and water take the shape of the container in which they are placed, yet sugar is called a solid while water is called a liquid. Explain.

CBSE Class 9 - Science - Matter In Our Surroundings - Reasoning Questions (#cbsenotes)(#class9Science)(#eduvictors)

Matter In Our Surroundings  Reasoning Questions

Q1: When 20-30g of salt is added to 500 ml of water in a beaker. We see salt dissolves and disappears in water. Give reasons for this.


Q2: If we put a drop of blue ink in a beaker filled with water and leave it undisturbed. Why does the water in the whole beaker turn blue?


Q3: Give reasons for the following observation:
The smell of hot sizzling food reaches you several metres away, but to get the smell from the cold food you have to go close.


Q4: Why is a diver able to cut through water in a swimming pool?


Q5: Sponge can be compressed. Why is it a solid?

CBSE Class 9/ Class 11- Biology - Nehemiah Grew - Father of Plant Anatomy (#PMtNotes)(#cbsenotes)(#eduvictors)

Nehemiah Grew - Father of Plant Anatomy

Nehemiah Grew (26 September 1641 – 25 March 1712) was an English plant anatomist and physiologist, known as the "Father of Plant Anatomy".

Nehemiah Grew (1641-1712) was practicing physician and worked as the secretary of the Royal Society, London. He began his work on the study of internal structure of the plants in the year 1664.

Class 11/10/9/8 - Chemistry - Uses of Gases (Worksheet) (#eduvictors)(#cbsenotes)

Uses of Gases 

(Worksheet)

Fill the blanks:

1. The gas that can be used to fill party balloons is _______.

2. The gas that is used to make flash light is _______ .

3. The gas widely used in advertisement signs is _______.

4. The gas present in tungsten bulb is _______.

5. The gas present in the universe is _______.

CBSE Class 9 - Chemistry - Matter in Our Surroundings (MCQs) (#cbsenotes)(#eduvictors)

Matter in Our Surroundings
(MCQs)

1. ______ is a physical quantity which expresses the amount of matter in a body.

(A) Mass
(B) Density
(C) Volume
(D) Temperature


2. The space inside a container that is occupied by matter is its ______.

(A) density
(B) mass
(C) volume
(D) shape


3. ______ is the ratio of mass of a substance to its volume.

(A) Viscosity
(B) Fluidity
(C) Density
(D) Elasticity

CBSE Class 9 Chemistry - Matter in our surroundings - Unit Test Paper (#cbsenotes)(#eduvictors)

Matter In Our Surroundings

(Unit Test Paper)

Matter in our surroundings 

Unit Test Paper

1. What is the physical nature of  matter? 

2. What are the characteristics of particles of matter? 

3. Why do the particles  mix faster in gases than in solids or liquids? 

4. Why can you smell an incense stick in the whole room even if it is lit at one place? 

5. Comment on the properties of matter in tabulated form keeping in mind the rigidity,  compressibility, kinetic energy,  fluidity and density.

Entrance Exams/CTET/NTSE/Class 9 - Agricultural Revolutions (#ntsenotes)(#entranceexams)(#eduvictors)

Agricultural Revolutions

Protein Revolution 
- higher productivity (Technology driven 2nd green revolution)
- coined by - Modi & Arun Jaitely

Green Revolution 
- Food grains
         - Green revolution "word" COINED by  William S Goud - UK

White Revolution or Operation Flood
-Milk production
-VARGHESE KURIEN

Class 7/8/10 - Forests Our Life Line or Natural Resources - Importance of Forest Resources (#cbsenotes)(#eduvictors)

Natural Resources - Importance of Forest Resources

The importance of forest resources can be described  as follows:

1. Ecological Balance
2. Renewable Natural Resources
3. Eco-system
4. Economic Development
5. Environment Quality
6. Safeguard against Pollution
7. Soil Conservation
8. Wind and Soil Erosion
9. Check the Extension Balance
10. Maintains Ecological Balance
11. Attracts Rainfall
12. Control Floods
13. Connects to our Cultural and Civilization
14. Supply of Raw Material

1. Ecological Balance: 

Forests and wildlife are essential to maintain ecological balance of an area.

CBSE Class 9 - Science - Annual Examination Question Paper - (2017-18) (#cbsepapers)(#eduvictors)

CBSE Class 9 - Science -
Annual Examination
 Question Paper - (2017-18)

CBSE Class 9 - Biology - Why Do We Fall ill? (Q and A) (#cbseNotes) (#eduvictors)

Why Do We Fall ill? (Short Q and A)

Q1: Define Health according to WHO?

Answer: According to WHO (World Health Organisation) health is a “state of physical, metal and social well-being of a person”.



Q2: When is WORLD HEALTH DAY celebrated?

Answer: On 7th April



Q3: Define Disease.

Answer: Any disturbance in the structure or function of any organ or part of body.



Q4: List any two conditions necessary for good health.

Answer:
(i) Good physical and social environment.
(ii) Good economic conditions.

Class 7/8/9/10 - Science - Clean Air: From Donora to Delhi - Can we breathe safely? (#eduvictors)(#cbse-notes)

Clean Air: From Donora to Delhi -
Can we breathe safely?

With the industrial revolution, the human mankind experienced the air pollution for the first time and realized it as a potential threat to human life. The black smoke of locomotives, factories from the industrial towns of England blackened its cities.

In 1950s, the smoke of industrialized Pennsylvania valley in USA made the air murkier. In the small town of Donora, population 14,000, residents suffered eye, nose, and throat irritation and breathing difficulties resulting in 20 deaths.

In 2008, on the 60th anniversary of the event, the town opened the Donora Smog Museum with the
slogan "Clean Air Starts Here".

CBSE Class 12/Class 11/Class 9 - DISCOVERIES IN ATOMIC STRUCTURE (#eduvictors)(#cbsenotes)

DISCOVERIES IN ATOMIC STRUCTURE

1. Dalton(1803) : Proposed Atomic Theory

2. Julius Plucker (1859) : First discoverer of cathode rays

3. Goldstein(1886) : Discovered anode rays and proton

4. Sir.J.J.Thomson(1897) : Discovered electron and determined charge/mass(e/m) ratio for electron

5. Rutherford(1891) : Discovered nucleus and proposed atomic model

CBSE Class 9 - Biology - Why Do We Fall ill? ( Important Terms to Remember) (#cbseNotes)

Why Do We Fall Ill?  Important Terms to Remember 

Here a few definitions are listed. Can you identify the terms defined here.


Decrease in number of RBCs and heamoglobin concentration.


A condition in which the normal functioning of the body or any part of it is damaged or disturbed.


A rapidly appearing disease, which lasts only in a few days.


A long lasting or a persisting disease.