Class 11 - Biology - Plant Tissues - Epidermal Tissue System in Plants - Important Points (#cbseNotes)

Epidermal Tissue System in Plants

Leaf Structure and Epidermis
(image credits: wikimedia)

1. The outer covering of the plant body is formed of epidermal tissue system.


2. The epidermal tissue system is composed of
ⅰ epidermal cells,
ⅱ stomata and
ⅲ edidermal appendages (trichomes and hairs).


3. Epidermis: The outermost layer of the primary plant body is called epidermis.


4. The epidermis is made up of elongated, compactly arranged cells. These cells form a continuous layer. There is usually a single layer of cells in the epidermis.


5. The epidermal cells are parenchymatous. In these cells, a small amount of cytoplasm lines the cell wall and a large vacuole is present.

Parenting Tip - Attitude (#parenting)

Parenting Tip - Attitude

CBSE Class 12 - Chemistry - Solutions -Very Short Questions and Answers (#cbseNotes)

Solutions -Very Short Questions and Answers

Q1: What is Van’t Hoff factor ?

Answer: It is the ratio of normal molecular mass to observed molecular mass. It is denoted
as i.
i = normal molecular mass/observed molecular mass
 = no. of particles after association or dissociation/no. of particles before


Q2: What is the Van’t Hoff factor in K₄[Fe(CN)₆] and BaCl₂ ?

Answer: 5 and 3


Q3: Why the molecular mass becomes abnormal ?

Answer: It is due to association or dissociation of solute in given solvent.


Q4: Define molarity. How it is related with normality ?

Answer: N = M ✕ Basicity or acidity

Class 9 - Biology - Tissues - 15 Amazing Facts About Blood That You Should Know (#cbseNotes)

15 Amazing Facts About Blood
That You Should Know

① Human heart pumps the blood 36 thousand liters of blood in the distance of 20 thousand kilometers in a day.

② Blood is a fluid connective tissue.

③ Human blood is red in colour due to the presence of red pigment i.e. haemoglobin.

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④ The blood is always not red in all animals. The cockroach has white blood where as there is blue coloured blood in a snail.

CBSE Class 12 - Computer Science - C++ Practical Binary File Processing Snippet-10 Copy Records (#cbseNotes)

C++ Practical
Binary File Processing Snippet-10
Copy Records 

Question: Given a binary file TELEPHON.DAT, containing records of the following class Directory

class Directory
  {
    char name[20];
    char address[30];
    char areacode[5];
    char phonenum[15];
    public:
      void register();
      void show();
      int checkcode(char AC[])
      { return strcmp(areadcpde, AC); }
   };

 Write a function COPYABC() in C++ that would copy all the records have areacode as "123" from TELEPHON.DAT to TELEBACK.DAT

Answer:

CBSE Class 11 - Biology - Role of Micro and Macro Nutrients in Plants (#cbseNotes)

Role of Micro and Macro Nutrients in Plants

Like other organisms, plants also require some elements for their growth. These elements are called nutrients. There are six macro nutrients and seven micro nutrients. Apart from this, water and air provides Carbon, Oxygen and Hydrogen.

Nutrient	Absorbed as	Role
Nitrogen	NO₂⁻,NO₃⁻ and NH₄⁺	Required by all metabolically active cells and meristematic tissues.
Phosphorus	H₂PO₄⁻ or HPO₄²⁻	Constitutes cell membranes, protenins, all nucleic acids and nucleotides, Required for ATP formpation.
Potassium	K⁺	Required in abundance by meristematic tissues, buds, leaves, root tips etc. Maintains anion-cation balance in cells.Involved in opening and closing of stomata and maintains turgidity of cells.
Calcium	Ca²⁺	Meristematic and differentiating tissues. Formation of mitotic spindle, activates enzymes, Synthesis of middle lamella (Capectate) of cell wall during cell division

CBSE Class 12 - Economics - Solved Question Paper - Delhi Region (2016-17) (#cbsePapers)

CBSE Class 12 - Economics  - Solved Question Paper - Delhi Region (2016-17) 

☛See Economics Question Paper (2016-17) Delhi Region