SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

PENGAYAAN

OSN SMP

29 Februari 2013

2013 BIOLOGI

Bagian 13

English

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

PENGAYAAN OSN BIOLOGI SMP 2013 PART : 13

1. A biologist ground up some plant leaf cells and then centrifuged the mixture to

fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the

light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and

lighter fractions are most likely to contain, respectively,

a. mitochondria and chloroplasts.

b. chloroplasts and peroxisomes.

c. peroxisomes and chloroplasts.

d. chloroplasts and mitochondria.

e. mitochondria and peroxisomes.

2. Which structure is not part of the endomembrane system?

a. nuclear envelope

b. chloroplast

c. Golgi apparatus

d. plasma membrane

e. ER

3. Which of the trees in this figure groups the domains according to similarities in cellular size and

architecture?

a. A

b. B

c. C

d. D

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

4. IJSO 1st 2004

A baby boy was born with a hemophilia disease. What is the possibility of his parents’

gene related to this disease?

A. The mother is hemophilia, the father is normal

B. The mother and father are both hemophilia

C. The mother carries hemophilia gene

D. The father carries hemophilia gene

5. IJSO 4th 2007

A student added 20 cm3 of 5 mM KHCO3 solution and 5 drops of universal pH indicator into a

250 cm3 conical flask (Fig.III-1). He cut the ends of leaves underwater and transferred the cut-

ends to a small glass vial with sufficient water for the cut-ends to be immersed. He then tied a

thread around the glass vial, lowered the vial into the conical flask, and sealed the flask with a

bung and parafilm. After these preparations, he started the following experiments.

For the following questions, please select the corresponding number of the right answer

from Table III-1 and fill it in the corresponding space in the answer sheet. Each item in the

table may be selected more than once or may not be selected at all.

Table 1

1: increased 2: decreased 3: remained the same 4: photosynthesis

5: respiration 6: transpiration 7: O2 8: CO2

9: K+ 10: HCO3- 11: OH- 12: H+

A

He placed the flask 30 cm from a 60 W tungsten lamp and turned on the lamp for 3 hours.

During the 3 hours, he found the pH value of the solution in the flask a . The reason is that

the leaves largely carried out the process of b , which consumed c , and caused the

concentration of ions of d and e in the solution to have f .

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

B

He turned off the lamp and left the flask in the dark for 3 hours. During the 3 hours, he

found the pH value of the solution in the flask a . The reason is that the leaves underwent the

process of b , which released c , and caused the concentration of ions of d and e in the

solution to have f .

C

He changed the solution of KHCO3 to 20 cm3 of 5mM NaOH, replaced the leaves with fresh

ones, resealed the flask, and then turned on the lamp for 3 hours. During the 3 hours, he found

that first the process of a__ in leaves decreased, and then the process of b in leaves

decreased.

(Isi jawaban di sini )

A

a.

b.

c.

d.

e.

f.

B

a.

b.

c.

d.

e.

f.

C

a.

b.

6. IJSO 4th 2007

The term homeostasis refers to the maintenance of the human body at relatively constant

conditions. An example of homeostasis is the concentration of the blood sugar (mainly the

blood glucose), which is regulated within a narrow range by hormones. Mr. Chen took the blood

sugar test by following the procedures: He first had the supper with his regular hospital meal at

6:00 pm and fasted and relaxed afterwards till the next breakfast at 8:00 am. Immediately after

his supper, blood samples for sugar concentration tests were taken and examined at every hour

for 8 hours. The results are shown in Figure III-2 in which the vertical scale is the sugar

concentration in blood and the horizontal scale is the time interval in unit of hour. The data

shows three phases. By the above serial blood test and physical examination, Mr. Chen’s health

condition was claimed by a medical doctor to be normal and free of diabetes.

blood

sugar

concentration

Hours (after supper)

Fig.III-2

phase

1 phase

2

phase

3

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

Based on the above information, answer the following questions by selecting appropriate

numbers (1 to 6) from Table III-2 or letters (a to e) from Table III-3.

Table III-2: Hormones that regulate the concentration of blood sugar

1. thyroxin

2. insulin

3. adrenaline

4. glucagon

5. growth hormone

6. cortisol

Table III-3: Statements that are related to changes in blood sugar concentration.

a. blood sugar absorbed by liver cells

b. blood sugar absorbed by pancreatic cells

c. product of glycogen decomposition released into blood

d. digested foods absorbed in intestine coming into blood

e. blood sugar excreted into urine

QUESTIONS NO 6

a. Which one of the statements in Table III-3 explains why the blood sugar concentration of

Mr. Chen increased during the phase 1 after the supper?

b. Which statement in Table III-3 explains the decreasing trend in Mr. Chen’s blood sugar

concentration during the phase 2?

c. Which one of the hormones in Table III-2 controls this phenomenon shown in phase 2?

d. Which one of the hormones in Table III-2 is the most possible candidate to regulate the

blood sugar concentration of Mr. Chen after phase 3 (as described in question III-2-C)?

e. Which one of the statements in Table III-3 is related to blood sugar concentration present

after phase 3 (as described in question III-2-C)?

f. Which one of the following figures would best capture the change of blood sugar

concentration in Mr. Chen’s body during the 6 hours after phase 3, i.e., the period during

8-14 hours after supper? (The following figures have the same scales as that in Fig. III-2 in

blood sugar concentration.)

(a) (b)

blood

sugar

conc.

8 10 12 hr

blood

sugar

conc.

8 10 12 hr

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

(c) (d)

blood

sugar

conc.

8 10 12 hr

blood

sugar

conc.

8 10 12 hr

g. Mr. Wang is a mild diabetic patient. He also has his suppers with the hospital regular meal at

6:00 pm and fasts afterwards for blood test. Gambarkan grafik konsentrasi gula darah

Mr.Wang di dalam grafik berikut!

blood

sugar

conc.

Hours (after supper)

7. IJSO 5th 2008

Methionine is used to synthesize proteins in cells. To determine the intracellular protein

transport pathway, pancreatic cells were cultured for 30 seconds in media containing 35S-

labeled methionine and then were transfered to fresh media with no radioisotopes. After 5

minutes, 30 minutes, and 120 minutes, respectively, cell organelles(a, b, c) were purified and

the radioactivity of each sample was measured.

The following graph shows the results.

Which of the following is the correct steps of the intracellular protein transport pathway?

a) a b c

b) a c b

c) b a c

d) b c a

phase

1 phase

2

phase

3

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

8. IJSO 4th 2007

A test on Mr. Wang has determined that Mr. Wang’s urine contains glucose. It is known that a

urine glucose molecule follows the following pathway: It is first absorbed by small intestine, and

then it travels through the cardiovascular and urinary systems. Finally, it is excreted in urine. In

the following passage, please fill in each blank with the number that corresponds to the

appropriate term .

A blood glucose molecule, absorbed by the villi of the small intestine, is carried by the a to the

liver, transferred through the b into the inferior vena cava, and flows into the c of the heart.

Then, the blood is pumped by the d to leave heart, flows into a e to delivery the blood to the

lungs, and flows back to the heart through a f . Passing through the g and the h , the blood is

pumped out of the heart and flows into the aorta. When the blood flows into the kidney

through a i , the blood glucose is filtrated into the kidney. Urine containing glucose not

reabsorbed by the kidneys is sent via an j into the k for storage. Finally, the glucose molecule

in urine is excreted through the l .

(JODOHKAN)

QUESTION ANSWER

a

b

c

d

e

f

g

h

i

j

k

l

9. IJSO 5th 2008

Birth records of four babies were mixed up by mistake at a hospital. The ABO blood types of

their parents were found as shown in the following table.

Given these four babies all have different blood

types, which of the following statements is true?

a. parents W: baby blood type – B

b. parentsW: baby blood type – AB

c. parents Y: baby blood type – A

d. parents Y: baby blood type – AB

1. pulmonary artery

2. pulmonary vein

3. left atrium

4. right atrium

5. left ventricle

6. right ventricle

7. hepatic artery

8. hepatic vein

9. hepatic portal vein

10. renal artery

11. renal vein

12. urethra

13. ureter

14. bladder

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

10. IJSO 4th 2007

For several years, Ms. Tu had continuously been applying a certain amount of X-pesticide on the

field for reducing the damage of pests on rice production. For each year, she counted pests

found in the rice field by numbers/m2 and plotted the results shown in this figure.

According to the above observation, Ms. Tu concluded that the X-pesticide was very effective in

the earlier years, but, it gradually became ineffective in later years. Based on the above information,

please answer the following questions.

a. By examining the data shown in Fig.III-3, which year was the first year for applying X-

pesticide?

b. Which one of the following statements matches Ms. Tu’s conclusion?

a. Mutations happened in Ms. Tu’s rice plants and the mutated rice plants attracted a

large quantity of various other pests to come.

b. A pesticide-resistant line was developed in the pest population, after which the number

of the pesticide-resistant insects increased.

c. Bad quality control in the production of the pesticide resulted in the ineffectiveness of

the pesticide.

d. After Ms.Tu applied X-pesticide in the field, heavy rains reduced the efficiency of the

pesticide.

c. Based on the study of Ms. Tu, to prolong the effectiveness of X-pesticide, which one of the

following suggestions is the best?

a. Lowering the applied dosage of X-pesticide every year

b. Doubling the applied dosage of X-pesticide every year

c. Alternation of high and low X-pesticide dosages on a yearly basis

d. Alternating application of X-pesticide with another effective pesticide each year.

0,0

50,0

100,0

150,0

2000 2001 2002 2003 2004 2005 2006 2007

no. o

f pe

sts

(/m

2 )

year

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

11.

The heavy line above illustrates the relationship between auxin concentration and cell

growth in stem tissues. If the same range of concentrations were applied to lateral buds,

what curve(s) would probably be produced?

a. I

b. II

c. III

d. II or III

e. I or III

12.

The results of this experiment, shown on the left of the graph (area A), may be used to :

a. show that these plants can live without gibberellin.

b. show that gibberellin is necessary in positive gravitropism.

c. show that taller plants with more gibberellin produce fruit (pods).

d. show a correlation between plant height and gibberellin concentration.

e. study phytoalexins in plants.

13. That experiment suggests that the unknown amount of gibberellin in the experimental plant

(B) is approximately.... (μg/ml = concentration unit)

a. 17 μg/mL.

b. 15 μg/mL.

c. 0.01 μg/mL.

d. 1.0 μg/mL.

e. 0.1 μg/mL

SMPN 2 PURWOREJO Author : Roihan M. Iqbal (2013)

14. In nature, poinsettias bloom in early March. Research has shown that the flowering process is

triggered three months before blooming occurs. In order to make poinsettias bloom in

December, florists change the length of the light-dark cycle in September. Given the

information and clues above, which of the following is a correct statement about poinsettias?

a. They are short-day plants.

b. They require a light period longer than some set minimum.

c. They require a shorter dark period than is available in September.

d. The dark period can be interrupted without affecting flowering.

e. They will flower even if there are brief periods of far-red illumination during the

nighttime.

Refer to this figure and then answer the following questions.

In west Texas, cotton has become an important crop in the

last several decades. However, in this hot, dry part of the

country there is little rainfall, so farmers irrigate their cotton

fields. They must also regularly fertilize the cotton fields

because the soil is very sandy. Figure 37.2 shows the record of

annual productivity (measured in kilograms of cotton per

hectare of land) since 1960 in a west Texas cotton field. Use

these data to answer the following questions.

15. What is the most likely cause of the decline in productivity?

a. The farmer used the wrong kind of fertilizer.

b. The rate of photosynthesis has declined due to irrigation.

c. Water has accumulated in the soil due to irrigation.

d. The cotton is developing a resistance to the fertilizer and to irrigation water.

e. The soil water potential has become more negative due to salination.

16. If you were the county agriculture agent, what would be the best advice you could give the

farmer who owns the field under study in this figure?

a. Plant a variety of cotton that requires less water and can tolerate salinity.

b. Continue to fertilize, but stop irrigating the field and rely on rainfall.

c. Continue to irrigate, but stop fertilizing the field and rely on organic nutrients in the soil.

d. Continue to fertilize and irrigate, but add the nitrogen-fixing bacteria Rhizobium to the

irrigation water until the productivity increases.

e. Add acid to the soil and increase its cation exchange capabilities so more nutrients are

retained in the soil.

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