Q4 of 367 Page 72

Veins and arteries carry blood. Which of these carry blood :

(a) away from the heart?


(b) back to the heart?

(a) Arteries carry blood from the heart to different organs.

(b) Veins carry blood from different organs to the heart.


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What substance/substances are transported in plants by:

(a) xylem vessels and tracheids?


(b) sieve tubes (or phloem)?

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What stops blood from flowing backwards through the heart?