2013年05月IB生物SL真题下载-Paper1

2013年05月IB生物SL真题下载-Paper1

1. A student investigated the growth of 100 cress seedlings in 2 normally distributed populations and carried out a t-test on the data. The calculated value of t was equivalent to a probability of between 0.15 and 0.25. What conclusion can be drawn from this?

A. The difference between the two populations is significant.

B. The difference between the two populations is not significant.

C. The data is positively correlated.

D. The data is negatively correlated.

 

2. Which functions of life are carried out by all unicellular organisms?

3. The diatom Didymosphenia geminata is a species of single-celled alga that lives in warm, shallow water. In the light microscope image below, the scale bar is equal to 10 micrometres (10 μm). What is the actual length of the cell?

A. 0.007 mm

B. 0.07 mm

C. 0.7 mm

D. 7.0 mm

 

4. What happens to the surface area to volume ratio as a cell grows?

A. It decreases.

B. It increases.

C. It doubles.

D. It does not change.

 

5. Water shows strong cohesive properties. Which of the following can occur because of the cohesive properties of water?

A. Water can be pulled up a plant through the xylem.

B. Enzymes can react with their substrates in cells.

C. Sweating cools the body on a hot day.

D. Salt can dissolve in sea water.

 

6. Which molecules are monosaccharides?

A. starch, glycogen, cellulose

B. sucrose, maltose, lactose

C. fructose, glucose, galactose

D. glucose, lactose, cellulose

 

7. What process occurs when fatty acids combine with glycerol to make a triglyceride?

A. Condensation

B. Decarboxylation

C. Denaturation

D. Hydrolysis

 

8. What are characteristics of eukaryotic cells?

9. Which movement occurs by osmosis?

A. Oxygen from alveoli into the blood

B. Water from a leaf into the atmosphere

C. Water from soil to root

D. Nitrate ions from soil to root

 

10. What links the pairs of complementary bases in a DNA double helix?

A. Covalent bonds

B. Hydrogen bonds

C. Ionic bonds

D. Peptide bonds

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