Mucopolysaccharides

Mucopolysaccharides or mucilages are the slimy substances produced by the plants.when husk of isbgol  is soaked it takes slimy form.when we cut ladyfinger vern. Bhindi  we can feel the slimy and sticky substance on our fingers.this is mucilage or a mucopolysaccharide. Mucilages  are also formed by sea weeds . agar,alginic acid, carrageenin are all mucilages of commercial importance. Mucopolysaccharides occur in cell wall of bacteria,connective tissue of animals and some body fluids.in cell wall they bind the proteins.in connective tissue and interstitial spaces they hold water.when present around ligaments and tendons they provide lubrication.synovial fluid in joints is a mucopolysaccharide.vitreous humour in eye ball contain mucopolysaccharide.hyaluronic acid occur in connective tissue.chondroitin sulphate occur in cartilage where it provides strength and flexibility.
BY:ASHWANI KUMAR. BIO TEACHER AT VIGYAN TUTORIALS.PATEL NAGAR PHAGWARA.9646388266

Are bones living or non living

Are bones living or non living:
Bone is made up of organic and inorganic material.the inorganic part constitutes 2/3rd of entire bone substance and it includes mainly the compounds of calcium and phophorus.organic material is mainly collagen fibres./ although bone is made up of compounds of calcium and phosphorus but there are living cells associated with bones which bring about growth of bones and perform other functions eg, bone has concentric rings of bone cells osteocytes.the hollow cavity in the bone has bone marrow which give rise to red and white blood cells.external surface of the bone is covered by a membrane called periosteum.this membrane has outer fibrous and inner cellular layers and it has rich blood supply through fine blood vessels./ in this way bones are living as long as they are inside the living body.bones undergo growth and repair also.but, when bones are outside the body and the cellr associated with them become dead then bone is a non living structure.
 BY:ASHWANI KUMAR.BIO TEACHER AT VIGYAN TUTORIALS. PATEL NAGAR PHAGWARA 9846388266

Why some old age people complain of stiff joints

Why some old age people complain of stiff joints

Many joints like knee joints,shoulder joints contain a lubricating fluid called synovial fluid.this fluid prevents friction between ends of bones.in old age formation of this fluid decreases.as a result friction between bones at joint site increases and bones can't move smoothly.therefore some people in old age complain of stiff joints
ASHWANI KUMAR.BIO TEACHER AT VIGYAN TUTORIALS PATEL NAGAR PHAGWARA 9846388266

ICSE : CLASS 9 : TEST PAPER : Chapters :Disease: Cause and Control/Hygiene- A key to Healthy Life

ICSE : CLASS 9 : TEST PAPER : Chapters :Disease: Cause and Control/Hygiene- A key to Healthy Life

1.Name the following                                                                                                                              a.A bacterium that causes tuberculosis.

b.Mosquito that spreads dengue

c.A fish used to control mosquito larvae

d. Larvae of housefly.

e. A liver disease characterised by yellow eyes and deep yellow urine.                                                                                                                                                                                                             5

2.Write true /false and correct the false statements by changing either first or last word only.

a.Louis Pasteur discovered a cure for malaria

b.Mumps and politomyelitis are caused by bacteria

c. Culex mosquito spreads dengue.

d.W hooping cough is also known as Diptheria                                                                                                                                                                                                                                                   4

3. Differentiate between

a.Endemic and Epidemic diseases.

b.Anopheles and Culex mosquito.

c.Virus and bacteria .                                                                                                                        6                                                                                                                                                                    4. Define

1.Infection.

2.Incubation period.

3.Vector                                                                                                                                                                                                                                                                                 3

5.Given below is a list of 4 pathogens and each followed by three diseases .underline the disease which does not match the pathogen.

a.Bacteria : Tuberculosis,Cholera,Mumps

b.Viruses : Rabies,Cholera,Poliomyelitis.

c.Worms :Taeniasis,Malaria,Ascariasis.                                                                                                                                                                                                                                                  3

6.How is polio transmitted?                                                                                                                                                                                                                                                                             1

 7.What is taeniasis? How does man get this disease?                                                                                                                                                                                                                                           2

8.What is the cause and symptoms of tetanus?How can it be prevented?                                             3

9.Why should one breathe by nose and not by mouh  ?                                                                                     1                                                                                         

10.Name 2 types of dysentary and their causative organisms.   

BY: ASHWANI KUMAR .BIO TEACHER AT VIGYAN TUTORIALS.PATEL NAGAR PHAGWARA 9646388266                                                                              2

ICSE: CLASS 9 : TEST PAPER: Digestive System  (Part 1)                                                     MM25

1.Name the following
a.Hardest substance in the body
b An enzyme in saliva.
c.Opening of stomach into intestine.
d Part of tooth exposed above gum.
e.The broad sharp cutting teeth                                                                                              5
2.Write true /false and correct the false statement by changing either first or last word only.
a.Saliva is slightly alkaline.
b.Soft connective tissue in central space of tooth is called dentine.
c.Bone like structure fixing the tooth root is called enamel
d.Premolars are also called wisdom teeth.                                                                              5
e.Human teeth are homodont
3.Match the colums
1.Gastric juice       a.cutting edges
2.Incisors               b.pepsin
3.premolars           c.tearing the food
4.canines               d.grinding crushing.
5.molars e.20/teeth/                                                                                                               5
4.Define
a. Digestion.
b.Peristalsis                                                                                                                            2
5.What is function of HCl acid in stomach?                                                                             2
6.What is the dental formula of normal human adult?                                                               1
7.mention the reflexes which occur when a person chews and swallows food.                          2
8.name three salivary glands and their location.                                                                       3.

BY: ASHWANI KUMAR .BIO TEACHER AT VIGYAN TUTORIALS.PATEL NAGAR PHAGWARA 9646388266 

Ways by which housefly contaminate our food

Ways by which housefly contaminate our food
 1.the body of housefly especially its spiny legs pick up filth containing germs from dirty places.when such a fly sit on our food,it leave the germs on food and contaminate it.
2.housefly pour saliva on food.the saliva may have germs which contaminate our food.
3.housefly deposits its excreta while it sit or feeds on food.the excreta may have germs which contaminate our food

BY: ASHWANI KUMAR. BIO TEACHER PHAGWARA 9646388266

ADVANTAGE OF PROPAGATION OF ROSE BY BUDDING AND CUTTING

Advantage of propagation of rose  by cutting:
 1.It is an easy and quick method
2.it gives flowers similar to parent plant.
advantage of propagation of rose by budding:
1. in this method plant already have well established stem and roots therefore new branches grow faster  and flower soon.
 2.Same plant can be made to produce different coloured roses.Suppose buds  from yellow and white rose plant are grafted on red rose stem.in this case same plant will produce red yellow and white roses on different branches.

BY : ASHWANI KUMAR.BIO TEACHER AT VIGYAN TUTORIALS PATEL NAGAR PHAGWARA.9646388266