Question

Transportation in the living organism, is necessary because of the following reasons: A. Food, oxygen, water and other essential substances are distributed through this system.
B. It displaces the excretory wastes from the cells of the body to the excretory organs from where they are expelled out.
C. Temperature and Pressure throughout the body are kept uniform
D. All of the above

Answer 1

Hint: Every organism requires nutrients and other important substances to survive and it is very important to remove toxic substances from the body. These materials reach the body with the help of blood.

Complete answer:
-Living organisms like plants and animals have complex organ systems with the multiple essential processes going on. The important processes include nutrition, excretion, metabolism, transportation etc. These important processes in the body help to remain healthy and help in maintaining functioning of the body.
-Different organisms have different methods of transportation like simple organisms like sponges circulating the water from their surroundings so that the cells can easily exchange the substances whereas complex organisms require fluids which helps in the transportation process.
-Blood is the important fluid which acts as a transport medium for various processes. The transport and exchange of carbon dioxide is important for the removal of toxic carbon dioxide from the blood.
-Blood helps in transport of nutrients or food, hormones and oxygen to transport.
The waste products are eliminated from the body via the kidney. Not only has this blood helps in the regulation of body temperature and osmotic balance.

Blood consists of:
-Plasma: It contains plasma proteins which help in carrying salts, minerals and hormones from one organ differently.
-Red blood cells: These are biconcave in the shape which helps in the binding of haemoglobin which in turn binds oxygen, carbon dioxide and many gases for the transportation.
-White blood cells: helps in providing immunity against harmful substances.
-Platelets: helps in the formation of platelet plug to stop bleeding.
-Blood also helps in the regulation of body temperature to maintain homeostasis. The major constituent of blood is the water which helps in maintaining a uniform pressure in the whole body.

Hence, the correct answer is option (D).

Note: The circulatory system or vascular system or transport system are the group of organs which helps in the transport, absorption and exchange of gases, nutrients, hormones between the different organs.