Life Processes

Topics in this chapter

• Plant Nutrition and Photosynthesis
• Human Nutrition and Digestion
• Cellular Respiration and Breathing
• Transportation in Plants
• Human Circulation and Transport
• Excretion and Urine Formation

Cheat sheet

Practice questions

1. Question 1Q-2CD397

   Which of the following is the correct sequence of events during photosynthesis in plants?

   1. A.Absorption of light energy -> Reduction of carbon dioxide to carbohydrates -> Conversion of light energy to chemical energy
   2. B.Absorption of light energy -> Conversion of light energy to chemical energy -> Splitting of water molecules into hydrogen and oxygen -> Reduction of carbon dioxide to carbohydrates
   3. C.Splitting of water molecules -> Absorption of light energy -> Reduction of carbon dioxide -> Conversion of energy
   4. D.Reduction of carbon dioxide -> Absorption of light energy -> Splitting of water -> Conversion of chemical energy
   See the answer and solution
2. Question 2Q-5FCA49

   During cellular respiration, which of the following molecules is formed in the cytoplasm when glucose is broken down into a 3-carbon molecule?

   1. A.Ethanol
   2. B.Lactic acid
   3. C.Pyruvate
   4. D.Carbon dioxide
   See the answer and solution
3. Question 3Q-0655F5

   Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

   1. A.Aquatic organisms have smaller lungs compared to land animals.
   2. B.The amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air.
   3. C.Water is denser than air, requiring more physical effort to inhale.
   4. D.Aquatic organisms are warm-blooded and require more energy to maintain body temperature.
   See the answer and solution
4. Question 4Q-DD0824

   Which components of the human circulatory system are responsible for preventing the backflow of blood inside the heart and veins respectively?

   1. A.Ventricles and capillaries
   2. B.Valves in both the heart and veins
   3. C.Atria and arteries
   4. D.Septum and lymph vessels
   See the answer and solution
5. Question 5Q-D2A3F5

   What is the primary function of the renal tubule part of a nephron during urine formation?

   1. A.Ultrafiltration of blood under high pressure
   2. B.Selective reabsorption of useful materials like glucose, amino acids, and salts
   3. C.Production of urea from ammonia in the liver
   4. D.Secretion of bile pigments into the digestive tract
   See the answer and solution