IMSO 2019 Science International - Theory I

Question 1

Use the figure showing an element cycle in nature. The figure represents the cycle of which element?

1. Carbon
2. Hydrogen
3. Nitrogen
4. Water

Question 2

Use the same cycle figure. Which organism can absorb solar energy and transfer it into the ecosystem?

1. Animals
2. Fish and olive tree
3. Human
4. Plants

Question 3

Use the cycle figure. Which gas do olive trees use for making food and growing new plant parts?

1. CO₂ — carbon dioxide
2. N₂ — nitrogen
3. O₂ — oxygen
4. SO₂ — sulfur dioxide

Question 4

Use the cycle figure. Which factor provides gasoline for most vehicles in the world?

1. Dead organisms and waste products
2. Fossils
3. Fossil fuels
4. Sunlight

Question 5

The human urinary system consists of kidneys, ureters, urinary bladder and urethra. It filters blood and eliminates waste in urine. Which structure stores urine until it is excreted?

1. Bladder
2. Kidneys
3. Ureter
4. Urethra

Question 6

1. Butter
2. Chicken meat
3. Fruits
4. Rice

Question 7

1. Cardiac muscle tissue
2. Skeletal muscle tissue
3. Smooth muscle tissue
4. None of the above

Question 8

Marine swimming crabs breathe underwater using gills, yet may survive out of water for hours or a few days. How do they stay alive out of water?

1. They breathe through their gills by keeping them moist
2. They breathe through lungs
3. They hold their breath until returning to water
4. They use oxygen stored in the blood

Question 9

A freshwater prawn of genus Macrobrachium has five pairs of pereiopods (thoracic legs). The first two pairs form chelipeds; the other three walking-leg pairs have seven segments. How many segments does a cheliped have?

1. 3 segments
2. 5 segments
3. 7 segments
4. 8 segments

Question 10

The diagram shows a forest food web. How many secondary consumers are there? Arrows run from food to consumer.

1. 2
2. 3
3. 4
4. 5

Question 11

1. Decrease in carbon dioxide concentration
2. Decrease in dissolved nitrate concentration
3. Decrease in number of bacteria
4. Decrease in oxygen concentration

Question 12

The diagram shows a typical leaf cross-section. Which group of labelled structures contains chloroplasts?

A. 1, 2 & 3

B. 2, 3 & 4

C. 3, 4 & 5

D. 4, 5 & 6

Question 13

Three sealed glass tanks stand outside on a sunny day for twelve hours: X contains mushrooms, Y a green plant, Z a mouse. Which option correctly describes changes in carbon dioxide and oxygen?

1. X: CO₂ ↑, O₂ ↓; Y: CO₂ ↓, O₂ ↑; Z: CO₂ ↑, O₂ ↓
2. X: CO₂ ↑, O₂ ↑; Y: CO₂ ↓, O₂ ↓; Z: CO₂ ↓, O₂ ↓
3. X: CO₂ ↓, O₂ ↑; Y: CO₂ ↓, O₂ ↑; Z: CO₂ ↑, O₂ ↓
4. X: CO₂ ↓, O₂ ↓; Y: CO₂ ↓, O₂ ↑; Z: CO₂ ↑, O₂ ↓

Question 14

Question 15

1. Constriction of blood vessels under skin
2. Increased metabolic rate
3. Shivering
4. Sweating

Question 16

1. Plasma volume
2. Number of platelets
3. Number of red blood cells
4. Number of white blood cells

Question 17

Question 18

1. Red blood cells, white blood cells, green blood cells and plasma
2. Only red blood cells, white blood cells and platelets
3. Red blood cells, white blood cells, platelets and serum
4. Red blood cells, white blood cells, platelets and plasma

Question 19

1. Carbohydrate
2. Deoxyribonucleic acid
3. Lipid
4. Protein

Question 20

The graph relates animal body temperature to surrounding temperature. What are animals A and B, respectively?

A. Panda, salamander

B. Shark, rat

C. Snake, crane

D. Turtle, chameleon