Best Study Notes » Science IX
What is meant by Molecular Mass?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance. It is therefore the relative mass of molecule expressed in atomic mass units (u). The molecular mass can be calculated as the sum of the atomic masses of all the atoms of any molecule. 1 mole of any substance = 6.022 x 10^ 23 units.
What is meant by Valency of an element?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
Valency refers to the combining capacity of an element. Valency can be used to find out how the atoms of an element will combine with the atom(s) of another element to form a chemical
compound. Valency of an element is the measure of electrons it needs or needs to loose to obtain a stable structure. The outermost shell of an atom is known as the valence shell. The electrons present in the valenc
compound. Valency of an element is the measure of electrons it needs or needs to loose to obtain a stable structure. The outermost shell of an atom is known as the valence shell. The electrons present in the valenc
What are the rules for assigning symbols for atoms of various elements?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
here are the rules for assigning symbols for atoms of various elements:
1. The abbreviation used to represent an element is generally the first letter in capital of the English name of element. Boron - B, Oxygen - O.
2. When the names of two or more elements begin with the same initial letter, the initial letter followed by the letter appearing later in the name is used to symbolize the eleme
1. The abbreviation used to represent an element is generally the first letter in capital of the English name of element. Boron - B, Oxygen - O.
2. When the names of two or more elements begin with the same initial letter, the initial letter followed by the letter appearing later in the name is used to symbolize the eleme
What is difference between ectoderm, endoderm and mesoderms?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
Ectoderm – The outermost germ layer of multicellular animals that develops into skin and nervous tissue.
Endoderm - The innermost germ layer of multicellular animals that develops into the lining of the digestive and respiratory systems.
Mesoderm - The middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue.
Endoderm - The innermost germ layer of multicellular animals that develops into the lining of the digestive and respiratory systems.
Mesoderm - The middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue.
What is difference between cod blooded and warm blooded animals?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
Cold-blooded organisms are those whose body temperature varies according to the external environmental temperature. Organisms whose internal body temperature is dependent upon their metabolic processes and is maintained at
a constant level are called Warm Blooded Animals. To generate heat, warm-blooded animals convert the food that they eat into energy. Examples of warm blooded organizms - Tig
a constant level are called Warm Blooded Animals. To generate heat, warm-blooded animals convert the food that they eat into energy. Examples of warm blooded organizms - Tig
What is the difference between Bilateral Symmetry and Radical Symmetry?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
Bilateral symmetry refers to the symmetrical arrangement of an organism along a
central axis, so that the body is divided into equivalent right and left halves by only one plane. Radical Symmetry is a form of symmetry, in which dividing the animal's body in any direction
along the central axis would always result in 2 identical halves being obtained. Bilateral Symmetry-is when an organism can b
central axis, so that the body is divided into equivalent right and left halves by only one plane. Radical Symmetry is a form of symmetry, in which dividing the animal's body in any direction
along the central axis would always result in 2 identical halves being obtained. Bilateral Symmetry-is when an organism can b
What are some of the ways to classify plants?
Best Coaching Class Notes by shruti (#2) 226 days ago (Article)
Classification of plants is done at three levels on the basis of
i) Presence or absence of well-differentiated body
ii) Presence or absence of vascular tissue
iii) Ability to bear seeds, which could be naked or enclosed in fruits.
i) Presence or absence of well-differentiated body
ii) Presence or absence of vascular tissue
iii) Ability to bear seeds, which could be naked or enclosed in fruits.
What are Apical, Lateral, Intercalary mersitem?
Best Coaching Class Notes by shruti (#2) 227 days ago (Article)
Apical mersitem – Meristem present at the growing tips of stem and root that causes the stem and root to increase in length.
Lateral meristem – Meristem located on the lateral portion of the plant and responsible for increasing the girth of its stem and root.
Intercalary meristem – Meristem found between already differentiated tissues, in locations such as the base of leaves or internode.
Lateral meristem – Meristem located on the lateral portion of the plant and responsible for increasing the girth of its stem and root.
Intercalary meristem – Meristem found between already differentiated tissues, in locations such as the base of leaves or internode.
What is Xylem?
Best Coaching Class Notes by shruti (#2) 227 days ago (Article)
Xylem is a type of complex tissue found in plants. Xylem is composed of tracheids, vessels, xylem parenchyma
and xylem fibres. It conducts water and minerals from roots to aerial parts of the plant.
and xylem fibres. It conducts water and minerals from roots to aerial parts of the plant.
What are 2 types of tissues present in plants?
Best Coaching Class Notes by shruti (#2) 227 days ago (Article)
Meristematic tissues and permanent tissues. Meristematic tissues may be apical, lateral or intercalary, depending on their location in the plant. Permanent tissues are classified into simple and complex tissues.
Simple tissue shows only one type of cells whereas complex tissue consists of more than one type of cells, functioning as a unit.
Simple tissue shows only one type of cells whereas complex tissue consists of more than one type of cells, functioning as a unit.
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