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Different problems occurs with disasters. In the concept map different effects are mentioned. Read it and fill the blank places.
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Balance the following equation stepwise.
$NaOH _{(aq)} + H_2SO_{4(aq)} \rightarrow Na_2SO_{4(aq)} +H_2O_{(l)}.$
→$NaOH _{(aq)} + H_2SO_{4(aq)} \rightarrow Na_2SO_{4(aq)} +H_2O_{(l)}.$
What is an electric motor? With the help of a labelled diagram, describe the working of a simple electric motor.
Explain the meaning of vaccination.
Observe the pictures given below.
When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
- What is Gland A, Substance B and Enzyme C?
- Name the tube D.
- What is the movement E known as?
- What are F, G and H?
The image in a plane mirror is virtual and laterally inverted. What does this statement mean?
What is alcoholism? What are its effects?
A small part of the shoot of a plant is removed with a sharp knife. When the lower end of this small part of the shoot is buried in moist soil, it gradually develops roots and shoots and grows to become a new plant.
- What is the name of this method of propagating plants?
- What care should be taken while removing a small part of the shoot from the parent plant with a knife?
- Name any two plants which provide us with food directly or indirectly and are grown by this method.
- Give one advantage of this method of producing new plants.
- State whether it is a sexual method of reproduction or an asexual method. Why?
- What special name can be given to the genetically identical new plants produced by this technique?
In case of sexual reproduction, newborn shows similarities about characters. Explain this statement with suitable example.
A part of the early classification of elements has been given below:
$\text{H}\ \ \ \ \ \ \ \text{Li} \ \ \ \ \ \ \ \text{Be} \ \ \ \ \ \ \ \ \ \text{B}\ \ \ \ \ \ \ \text{C}\ \ \ \ \ \ \ \text{N}\ \ \ \ \ \ \ \text{O}\\\text{F}\ \ \ \ \ \ \ \text{Na}\ \ \ \ \ \ \text{Mg}\ \ \ \ \ \ \ \text{Al}\ \ \ \ \ \ \text{Si}\ \ \ \ \ \ \ \text{P}\ \ \ \ \ \ \ \ \text{S}$
→$\text{H}\ \ \ \ \ \ \ \text{Li} \ \ \ \ \ \ \ \text{Be} \ \ \ \ \ \ \ \ \ \text{B}\ \ \ \ \ \ \ \text{C}\ \ \ \ \ \ \ \text{N}\ \ \ \ \ \ \ \text{O}\\\text{F}\ \ \ \ \ \ \ \text{Na}\ \ \ \ \ \ \text{Mg}\ \ \ \ \ \ \ \text{Al}\ \ \ \ \ \ \text{Si}\ \ \ \ \ \ \ \text{P}\ \ \ \ \ \ \ \ \text{S}$
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Which law of classification of element is illustrated by the above arrangement of elements?
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Name the scientist who proposed such a classification of elements.
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Why is such a classification of elements compared with a characteristics of musical scale?
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State one limitation of this classification of elements.