Showing posts with label class10-science. Show all posts
Showing posts with label class10-science. Show all posts

Friday, 27 October 2017

CBSE Class 10 - Biology - Study Notes about Plant Growth Hormones (Phytohormones) (#cbseNotes)

Plant Hormones (Phytohormones)

CBSE Class 10 - Biology - Study Notes about Plant Growth Hormones (Phytohormones) (#cbseNotes)


Plant hormones or phytohormones are small, simple chemical molecules, which are present in low concentration in plants and regulate growth, differentiation and development.


Two Categories of Phytohormones:

Plant growth promoters: Examples are auxins, gibberellins and cytokinins.
Plant growth inhibitors: Examples are abscisic acid, ethylene.


All about Auxins
Auxins are weakly acidic growth hormones.

Darwin (1880) was first to find about Auxins in the tip of canary grass.

These hormones are found in shoot apex, leaf Primordia and developing seeds.

Sunday, 8 October 2017

CBSE Class 10 - Chemistry - Ch5 - Periodic Classification Of Elements (Concept Points) (#cbseNotes)

PERIODIC CLASSIFICATION OF ELEMENTS (Concept Points)

Modern Periodic Table
credits: By Mbenzdabest (Own work) [CC BY-SA 4.0 ],
via Wikimedia Commons


1. Early chemists classified elements as metals and non-metals on the basis of a set of physical and chemical properties.

2. Dobereiner classified elements on the basis of “Law of Triads” which states that “atomic mass of the middle element of a triad is almost the arithmetic mean of the other two elements”.


3. A triad of elements is a group of three elements arranged in the order of increasing atomic masses, such that a group of such elements have similar physical and chemical properties.


4. Newland classified elements on the basis of “Law of Octaves” stated by him. According to
this law :
“When the elements are arranged in the order of increasing atomic mass, the properties of the eighth element (starting from a given element) are a repetition of the properties of the first element.”


Thursday, 5 October 2017

CBSE Class 10 - Chemistry - Chapter 4 - Carbon and its Compounds - Important Points To Memorise (#cbsenotes)

Carbon and its Compounds 
Important Points To Memorise

CBSE Class 10 - Chemistry - Chapter 4 - Carbon and its Compounds - Important Points To Memorise (#cbsenotes)


1. Carbon forms a large variety of compounds because of its tetra-valency and the property of catenation.


2. Hydrocarbons are the compounds of carbon and hydrogen.


3. Hydrocarbons are of two types – saturated hydrocarbons (alkanes) and unsaturated hydrocarbons (alkenes and alkynes)


Wednesday, 27 September 2017

CBSE Class 10 - Biology - Heredity and Evolution - Origin Of Life On Earth (Concept Points) (#cbseNotes)

Origin Of Life On Earth (Concept Points)

CBSE Class 10 - Biology - Heredity and Evolution - Origin Of Life On Earth (Concept Points) (#cbseNotes)


Most scientists believed that life arose from nonliving matter, mostly from gases. It originated in primitive form in the oceans of the earth.

4 billion years ago, the primitive atmosphere was formed. It had little oxygen and was likely thick with water vapor, along with compounds released by volcanic eruptions, such as nitrogen oxides, carbon dioxide, methane, ammonia, and hydrogen.

Sunday, 17 September 2017

CBSE Class 10 -Chemistry - Metals and Non-Metals (Short Q and A)(#cbseNotes)

Metals and Non-Metals (Short Q and A)

CBSE Class 10 -Chemistry -  Metals and Non-Metals (Short Q and A)(#cbseNotes)

Q1: Define Element.

Answer: An element is a pure substance which is made up of same kind of atom which differs from their physical and chemical properties.


Q2: How many elements are known so far? How many of them are naturally occurring?

Answer: 118 under which 92 are naturally occurring.


Q3: Give examples of the most abundant elements.

Answer: Aluminium ( the most) and Iron


Q4: Which is the most abundant non-metal?

Answer: Oxygen (O)


Q5: Give examples of the least reactive metals.

Answer:
• Gold
• Silver
• Platinum


Saturday, 9 September 2017

Class 10 - Physics - Light and Reflection - Magnification Chart For Mirrors (#cbseNotes)

Light and Reflection -
Magnification Chart For Mirrors

Class 10 - Physics - Light and Reflection - Magnification Chart For Mirrors (#cbseNotes)


Q: What is Magnification?

Answer: The ratio of height of image to the height of an object is known as magnification of an image and is denoted as m.

           Image height         h'     -v
    m = -------------------- = ---- = ----
           Object height        h       u
 


The +ve value of magnification represents virtual image of an object.

The -ve value of magnification represents real image of an object.


Q: Using magnification formula, prove that image formed by a plane mirror is at the same distance as object but behind the mirror. It is given that in plane mirror, object height and image height are equal.


Friday, 8 September 2017

CBSE Class 10 - Light - Reflection From Mirrors (Worksheet) (#cbseNotes)

Light - Reflection From Mirrors (Worksheet)

CBSE Class 10 - Light - Reflection From Mirrors (Worksheet) (#cbseNotes)



1. We get a diminished image with a concave mirror when the object is placed ____.


2. The drivers mirror used in automobiles is ____.


3. The distance of focus F from the pole P is termed as the ..................... of the mirror.


4. Mirror formula is ____.


Tuesday, 5 September 2017

CBSE Class 10 - Biology - Life Processes (TRANSPORTATION and EXCRETION) - Assignment Sheet (#cbseNotes)

TRANSPORTATION & EXCRETION (Biology - Life Processes) - Assignment Sheet

CBSE Class 10 - Biology - Life Processes (TRANSPORTATION and EXCRETION) - Assignment Sheet (#cbseNotes)

1. Name any 5 substances transported by human blood.


2. Describe briefly the composition of blood.


3. Write the functions of the following :
a) Red Blood Cells
b) White Blood Cells
c) Blood Platelets
d) Plasma
e) Lymph
f) Bicuspid and Tricuspid valves
g) Pericardial Fluid

Saturday, 2 September 2017

CBSE Class 10 - Biology - Asexual reproduction vs Sexual reproduction (#cbseNotes)

Asexual reproduction vs Sexual reproduction

CBSE Class 10 - Biology - Asexual reproduction vs Sexual reproduction (#cbseNotes)



No. Asexual reproduction Sexual reproduction
1. Only One parent is involved. Both male and female parents are involved.
2. Occurs in unisexual plants. Occurs in bisexual plants.
3. Occurs in lower plants. Occurs in higher plants and animals.
4. Reproductive organs are not present Fully developed reproductive parts are present.

Friday, 1 September 2017

CBSE Class 10 - BIOLOGY ASSIGNMENT - CONTROL AND COORDINATION (#cbseNotes)

CONTROL AND COORDINATION (BIOLOGY ASSIGNMENT)

CBSE Class 10 - BIOLOGY ASSIGNMENT - CONTROL AND COORDINATION (#cbseNotes)


1. What are gustatory and olfactory receptors?

2. Draw a diagram of neuron and neuro muscular function.

3. What is synapse?

4. What is reflex arc?

5. Draw a diagram to show reflex arc

6. What does CNS comprise of? Write its function.

7. What is peripheral nervous system? Write its functions.

8. Name the three parts and regions of brain.

9. Why forebrain is main thinking part of brain?

10. How sensation of feeling full stomach is felt?

Wednesday, 30 August 2017

CBSE Class 10 - Chemistry - Metals and Non-Metals - Alloys Their Compositions and Uses (#cbseNotes)

Alloys - Compositions, Properties and Uses

CBSE Class 10 - Chemistry - Metals and Non-Metals - Alloys Their Compositions and Uses (#cbseNotes)


Steel
Components: Iron, Carbon

Properties: Hard and Strong

Uses:
- Construction of buildings and bridges,
- manufacture of ships
- manufacture of spare parts for automobiles






Tuesday, 29 August 2017

CBSE Class 10 - Science - Life Processes - Pathway of Air (#cbseNotes)

 Life Processes - Pathway of Air
(Breathing Process)

CBSE Class 10 - Science - Biology
CBSE Class 10 - Science - Life Processes - Pathway of Air  (#cbseNotes)

Breathing process involves a the pathway of air from nostril to alveolus. It is a physical process. The pathway is described as follows:



Nostrils:        
Air usually enters the body through the nostrils.
Nasal cavity:
Air is filtered. The moist surface of the lining of the nasal cavity, and the hairs growing from its sides, remove some of the tiny particles of dirt in the air. In addition, as the inhaled air passes through the nasal cavity, its temperature is brought close to that of the body, and it takes up water vapour so that it becomes more moist than before.

Monday, 28 August 2017

CBSE Class 10 / class 8 - Science - About Human Eye (#cbseNotes)

About Human Eye - Questions and Answers

CBSE Class 10 / class 8 -  Science - About Human Eye (#cbseNotes)


Human eye can be considered as an optical instrument. Light rays coming from the object to be seen enter the eye through Cornea and fall on the eye lens through the pupil of the eye.



Parts of the human eye are:


Cornea:
The transparent spherical membrane covering the front of the eye.

Tuesday, 22 August 2017

CBSE Class 10 - Science - Unit Test 2 Question Paper (2017-18) (#cbsePapers)

CBSE Class 10 - Science  - Unit Test 2 Question Paper (2017-18)  (#cbsePapers)

CBSE Class 10 - Science  - Unit Test 2 Question Paper (2017-18) 

Chapters covered are:

1. Biology - Control and Coordination
2. Chemistry - Acids, Bases and Salts
3. Physics - Magnetic Effects of Current


CBSE Class 10 - Science - MANAGEMENT OF NATURAL RESOURCES - Important Points That You Must Know (#cbseNotes)

MANAGEMENT OF NATURAL RESOURCES - Important Points That You Must Know

CBSE Class 10 - Science - MANAGEMENT OF NATURAL RESOURCES - Important Points That You Must Know (#cbseNotes)


1. We can manage and conserve our natural resources as well as the environment through sustainable development.


2. Sustainable development means development which meets the needs of the present generation as well as of the future generation.


3. The objective of sustainable development is to maintain a healthy environment which is pollution free, so that human beings can live in harmony with nature.


4. To achieve sustainable development, the goal should be to minimise resource use.


Saturday, 5 August 2017

CBSE Class 10 - Chemistry - Acids and Bases - pH of common Acids, Bases and Salts (#cbseNotes)

pH of common Acids, Bases and Salts

CBSE Class 10 - Chemistry - Acids and Bases - pH of common Acids, Bases and Salts  (#cbseNotes)

The acidity of an aqueous solution relies on the concentration of hydronium ions, [H₃O⁺]. For various products (acids, bases and salts), the magnitude of this concentration varies and pH scale is used conveniently. The pH of a solution is defined as the negative base-10 logarithm of the hydronium ion concentration (in mol/L). Here follows a partial list of pH of common acids, bases and salts.



Solution PH range
HCL 1.0 - 2.0
Gastric Juices 1.4 - 2.0
Lemon Juice 2.0- 3.0
Vinegar 4.0
Tomato Juice (Oxalic Acid) 4.1
Coffee 5.0
Milk (Lactic Acid) 6.5