Biology for ( Grade 10 )

atmosphere

(C) upward conduction of water and minerals (D) absorption of

O 2 from atmosphere

6. Opening and closing of stomata is due to

(A) pressure of gases inside the leaves (B) changes of turgor

pressure in guard cells

(C) effect of hormones (D) their genetic constitution

7. The carbohydrates synthesized in the leaves are transported
   through sieve tubes most commonly in the form of
   (A) glucose (B) starch (C) sucrose (D)

cellulose

8. In a closed circulatory system, blood is completely enclosed with in

(A) sinuses (B) vessels (C) heart (D)

skeleton

9. An artery is a vessel that carries blood

(A) with high concentration of oxygen (B) with high

concentration of CO 2

(C) away from the heart (D) both A & C

10. Values are found in veins to check the backflow of blood flowing

under

(A) low pressure (B) high pressure (C) no

pressure (D) atmospheric pressure.