The autotrophic mode of nutrition refers to the process by which organisms produce their own food using energy from sunlight, carbon dioxide, and water. Let's break down each component:

**Carbon Dioxide and Water:**
Autotrophs, such as plants and algae, utilize carbon dioxide (CO2) from the atmosphere and water (H2O) from the soil or surrounding environment to synthesize organic molecules, particularly glucose, through a process called photosynthesis. CO2 is absorbed through tiny pores called stomata on the leaves, while water is absorbed through the roots and transported to the leaves.

**Chlorophyll:**
Chlorophyll is a green pigment found in chloroplasts, which are the specialized organelles responsible for photosynthesis in autotrophic organisms. It plays a crucial role in capturing sunlight energy and converting it into chemical energy through a series of complex biochemical reactions. Chlorophyll absorbs light in the red and blue regions of the electromagnetic spectrum, while reflecting green light, giving plants their characteristic green color.

**Sunlight:**
Sunlight is a vital component in the autotrophic mode of nutrition as it provides the energy needed for photosynthesis. When sunlight is absorbed by chlorophyll, it energizes electrons, initiating a chain of reactions that convert carbon dioxide and water into glucose and oxygen. The energy stored in glucose molecules is utilized by plants for various metabolic processes and growth.

**All of the Above:**
The correct answer, option 'D', states that all the given components (carbon dioxide, water, chlorophyll, and sunlight) are required for the autotrophic mode of nutrition. This is because each component plays a crucial role in different steps of the photosynthetic process. Without any one of these components, autotrophs would not be able to produce their own food efficiently and sustain their growth and survival.

In summary, autotrophs require carbon dioxide, water, chlorophyll, and sunlight to carry out photosynthesis and produce their own food. These components work together in a complex process to convert light energy into chemical energy, enabling autotrophs to synthesize organic molecules and support their life processes.

Photosynthesis require the following 1.CO2 2.water 3.chlorophyll 4.sunlight