Science

1. Match List I with List II and select the correct answer using the codes given below the lists :

List I	List II
A. Cell theory	1. P. Mitchell
B. Theory of natural selection	2. Beadle and Tatum
C. One gene-one enzyme hypothesis	3. Schleiden and Schwann
D. Chemiosomotic hypothesis	4. C. Darwin

Code:

               A B C D

          (a) 2 3 4 1

          (b) 3 4 1 2

          (c) 3 4 2 1

          (d) 4 1 2 3

2.Why does a piece of bread when chewed tastes sweet?

(a) The sugar content of bread is drawn out

(b) The taste buds are stimulated by chewing

(c) Saliva’s action converts starch into maltose

(d) It does not taste sweet; it is just an illusion

3.Which of following vessels contains oxygenated blood?

          (a) Hepatic veins

          (b) Pulmonary vein

          (c) Hypophyseal portal vein

          (d) Renal vein

4. The excreta of lizards and birds contains a white component which is chemically:

          (a) urea                    (b) uric acid

          (c) creatinine

          (d) precipitated calcium

5. Sea-shore trees do not show annual rings because:

          (a) there is little climatic variations

          (b) they belong to monocots

          (c) there is enough moisture

          (d) soil is sandy