Q1. Explain how fertilizers are different from manure.
(b) What would you choose between manure and fertilizer to provide nourishment in your field and why?
Q2. Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?
Q3. (a) Name two diseases that are caused by virus. (b) Write one important characteristic of virus.
Q4. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic
and is used for making electrical switches, handles of various utensils, etc. Write the major difference between these two
types of plastics?
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ANSWER THE RIGHT.
Answers
Answer:
Q1(a)Fertilizers are very different from manure as follows
Fertilizers
1. Fertilizer is a man-made chemical substance which is added to increase productivity and soil fertility
2. They would be prepared in factories.
3. They do not provide humus to the soil.
4. Fertilizers are rich in nutrients.
5. They cause side effects to their organisms
Manure
1. Manure is a natural substance made from animal excreta and plant waste, that is added to increase soil fertility.
2. It would be prepared at homes and in agricultural fields.
3. It provides humus to the soil.
4. It is less rich when compared with fertilizers.
5. It does not cause harm to others.
(b)-I would choose manure in order to provide nourishment in my field because;-
It's a natural substance.
It provides humus to the soil.
It is prepared in the field.
It is slowly absorbed by the soil whereas Fertilizers can be easily absorbed by the soil.
It is bought in bulk.
Q2:-Plant cells have an additional layer around cell membrane known as cell wall which is made up of cellulose. It maintains the shape and turgidity of the cell. It provides mechanical support and protection to the cell.
Q3(a):-smallpox and the common cold and different types of flu.
(b):-Most viruses are extremely well adapted to their host organism, virus structure varies greatly. However, there are some general structural characteristics that all viruses share. All viruses have a capsid or head region that contains its genetic material. The capsid is made of proteins and glycoproteins.
Q4:-PVC is a thermoplastic and Bakelite is a thermosetting plastic. thermoplastic (PVC) can be remelted or molded whereas if we try to melt thermosetting plastic, it will not melt it will get burnt in gaseous form. thermoplastic can be recycled whereas thermosetting cannot be recycled