Autotrophic Nutrition: Life Processes

What is the mode of nutrition where organisms use simple inorganic materials to synthesize their own food?

• Saprotrophic nutrition

• Autotrophic nutrition

• Parasitic nutrition

• Heterotrophic nutrition

12. Which of the following are examples of autotrophs?

• Animals and fungi
• Green plants and some bacteria
• Humans and animals
• Yeast and mushrooms

13. What is the process by which autotrophs convert substances from the outside into stored forms of energy?

• Respiration
• Photosynthesis
• Transpiration
• Translocation

Answer explanation

Photosynthesis is the process where "autotrophs take in substances from the outside and convert them into stored forms of energy".

14. What are the primary raw materials taken in by autotrophs for photosynthesis?

• Nitrogen and oxygen
• Sunlight and soil
• Carbon dioxide and water
• Carbohydrates and proteins

15. What is the role of sunlight and chlorophyll in photosynthesis?

• They are the end products
• They provide the location for the reaction
• They are necessary conditions for converting CO2 and water into carbohydrates
• They are waste products

Answer explanation

The material is "converted into carbohydrates in the presence of sunlight and chlorophyll".

16. How are carbohydrates that are not immediately used by the plant stored?

• As glycogen
• As starch
• As fat
• As protein

Answer explanation

"The carbohydrates which are not used immediately are stored in the form of starch".

17. In humans, what is the equivalent form of stored energy to starch in plants?

• Starch
• Cellulose
• Glycogen
• Glucose

Answer explanation

"some of the energy derived from the food we eat is stored in our body in the form of glycogen".

18. Which of these is the correct chemical equation for photosynthesis?

• C6​H12​O6​+6O2​→6CO2​+6H2​O
• 6CO2​+12H2​OSunlightChlorophyll​C6​H12​O6​+6O2​+6H2​O
• 6O2​+6H2​O→C6​H12​O6​+6CO2​
• C6​H12​O6​→2C2​H5​OH+2CO2​

19. What is the first event that occurs during photosynthesis?

• Reduction of carbon dioxide
• Splitting of water molecules
• Absorption of light energy by chlorophyll
• Conversion of chemical energy to light energy

Answer explanation

The first event listed is the "Absorption of light energy by chlorophyll".

20. What happens to light energy during photosynthesis?

• It is converted to kinetic energy
• It is converted to chemical energy
• It is destroyed
• It is stored as heat

Answer explanation

A key event is the "Conversion of light energy to chemical energy".