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Class 9

Answer 1

Answer:

2. Plasma membrane is a selectively permeable membrane because it allows only some materials to pass through it.

3. Blood is a liquid connective tissue which contains RBCs, WBCs, platelets, plasma and haemoglobin.

WBCs are the immunity of our body which fights against the pathogens that enter our body. Platelets are responsible for clotting the blood on the wound and prevent blood loss.

4. Adipose tissues contain a fat gobule. Its functiins are:

• It provides heat protection and regulate the body temperature.
• Its forms shock absorbing cusions around kidneys and eyeballs which provides protection.

5. Butterflies are bilaterally symmetrical and segmented. They have jointed legs. They also have an open circulatory system, and so blood does not flows in well defined blood vessels.

These features indicate that the butterflies are classified into Arthropoda.

7. An active immune system recruits many cells to the affected tissue to kill the foreign particles entered in our body. This process of recruitement is called inflammation.

As a part of this process, there are local effects such as:

• Swelling
• Pain
• Fever

8. To prevent water borne diseases, we should treat and store water safely. We should not allow it to be stored in open containers to prevent breeding of mosquitos. We must always drink clean water.

To prevent vector borne disease, we should keep our food covered and control fly/mosquito breeding and also control the flies and prevent exposure.

12. Manure contains large quantities of organic matter and also supplies small quantities of nutrients in the soil.

Manure helps in enriching the soil woth nutrients and organic material which increases soil fertility.

Types of manure are:

• Compost & Vermicompost
• Green manure