Question

please help class 9 science​

Answer 1

Answer:

Hello

Explanation:

13 ) In the case of malaria , the vector is the anopheline mosquito and the deasese causing organism is the malaria parasite. Human and anopheline mosquitoes both are considered to be parasite's hosts.

14 ) a) RBC :- RBCs play very important role in the human body. It gives the red colour to the human blood because it contains a red coloured pigment called hemoglobin . It transferred the oxygen to the all body parts. When the oxygen react or mix with the hemoglobin which is present in the RBCs then it become oxyhemoglobin and then transfer to the whole body.

b ) Platelets :- Platelets play a very important role in the human body. It secrets the vasoconstrictors which constrict blood vessels , causing vascular spams in broken blood vessels. It secrets clotting factor which are help in blood clotting. Its help to promote the excessive flow of blood.

Hope its help you and mark me as brainlist.