241. Those blood vessels which carries blood from all parts of body towards heart is?
(a) Arteries
(b) Veins
(c) Artery
(d) Aorta
242. Absorption of water molecules through root hairs is due to?
(a) Active transport
(b) Osmosis
(b) Diffusion
(d) Pressure flow
243. According to pressure flow theory one of the following is NOT a sink?
(a) Root
(b) Leaves
(c) Stem tubers
(d) Fruits
244. When you suck a cold drink using drinking straw, it resembles with?
(a) Diffusion
(b) Flow of material in phloem
(c) Flow of material in xylem
(d) Root pressure
245. The cells which form platelets are?
(a) Erythrocytes
(b) Bone marrow cells
(c) Leucocytes
(d) All of these
246. A person is transfused with a donor blood group 0″. His blood group may be?
(a) AB
(b) B
(c) A
(d) all of these
247. Which of the following chamber has the thickest walls in human heart?
(a) Right atrium
(b) Left ventricle
(c) Left atrium
(d) Right ventricle
248. The exchange of materials between the blood and tissues occurs in?
(a) Arteries
(b) Capillaries
(c) Veins
(d) Arteries and veins
249. All veins carry deoxygenated blood except the one vein called?
(a) Vena cava
(b) Pulmonary
(b) Hepatic portal
(d) Renal
250. Valves to prevent the backflow of blood are found in the?
(a) Arteries
(b) Capillaries
(c) Veins
(d) Arteries and capillaries
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