please help me with my holiday homework
Answers
Here's your answer!! hope it helps you :D
Answer Explanation:
a) Due to their tendency to change their shape, WBC can squeeze themselves through walls of blood vessels and get into intercellular spaces to fight against germs .
b)There are several traditional methods of food preservation used at the household level that can be classed as chemical methods. Substances such a sugar, salt, vinegar, spices and wood-smoke are generally regarded as safe and natural preservatives. Salting, sugaring and smoking are all methods of curing foods. Curing is a general term that covers all these types of food preservation.
c)Advantages of manures over fertilizers are:
- It improves soil texture.
- It improves water retaining capacity of soil.
- Since manure is not nutrient specific so it replenishes all the nutrients of soil.
- It increases the number of useful micro-organisms in soil.
- It does not cause water pollution.
d)Plant cells have a cell wall, but animals cells do not. Cell walls provide support and give shape to plants.
Plant cells have chloroplasts, but animal cells do not. Chloroplasts enable plants to perform photosynthesis to make food.
Plant cells usually have one or more large vacuole(s), while animal cells have smaller vacuoles, if any are present. Large vacuoles help provide shape and allow the plant to store water and food for future use. The storage function plays a lesser role in animal cells, therefore the vacuoles are smaller.