24. define energy.
25.why is energy important to a living organism?
26.what is the difference between an autotroph and a heterotroph?
27. what is the name of the process that plants use to make their own food using energy from the sun?
28. what are some environmental factors (stimuli) that organisms respond to?

Question

Accepted Answer

### Question 24
# Brief Explanations:
Energy is the capacity to do work or cause change. In living organisms, it's used for processes like growth, reproduction, and maintaining homeostasis.
# Answer:
Energy is the ability to do work or bring about a change; it powers biological processes (e.g., growth, metabolism) in living organisms.

### Question 25
# Brief Explanations:
Living organisms need energy for essential life processes: growth (cell division, tissue development), reproduction (making offspring), metabolism (chemical reactions like digestion), maintaining homeostasis (regulating internal conditions), and responding to stimuli (moving from danger, seeking food). Without energy, these processes stop, and the organism can’t survive.
# Answer:
Energy is vital for living organisms to perform essential life processes: growth (cell growth/division), reproduction (producing offspring), metabolism (all chemical reactions, e.g., respiration, digestion), maintaining homeostasis (stable internal environment), and responding to stimuli (e.g., moving from harm, finding food). Without energy, these processes cease, leading to death.

### Question 26
# Brief Explanations:
Autotrophs (e.g., plants, algae) make their own food using energy from sunlight (photosynthesis) or chemicals (chemosynthesis). Heterotrophs (e.g., animals, fungi) cannot make their own food and must consume other organisms (autotrophs or other heterotrophs) for energy and nutrients. The key difference is the source of food production.
# Answer:
- Autotroph: An organism (e.g., plant, algae) that produces its own food (e.g., via photosynthesis/chemosynthesis) using energy from sunlight or chemicals.
- Heterotroph: An organism (e.g., animal, fungus) that cannot make its own food and relies on consuming other organisms (autotrophs/heterotrophs) for energy and nutrients.

### Question 27
# Brief Explanations:
Plants use photosynthesis to make their own food. In photosynthesis, plants use sunlight energy, carbon dioxide (from the air), and water (from the soil) to produce glucose (a sugar) and oxygen. Chlorophyll in plant cells captures light energy to drive this process.
# Answer:
The process is **photosynthesis**. During photosynthesis, plants use sunlight energy, carbon dioxide ($\ce{CO_2}$), and water ($\ce{H_2O}$) to produce glucose (food) and oxygen ($\ce{O_2}$), using chlorophyll in their cells.

### Question 28
# Brief Explanations:
Organisms respond to environmental stimuli like light (e.g., plants growing toward light), temperature (e.g., animals hibernating in cold), water (e.g., plants wilting without water), gravity (e.g., roots growing downward), chemicals (e.g., plants responding to fertilizers), and other organisms (e.g., prey avoiding predators, plants competing for space). These stimuli trigger behavioral or physiological responses to survive.
# Answer:
Organisms respond to environmental factors (stimuli) such as:
- Light (e.g., plants phototropism, animals’ daily rhythms).
- Temperature (e.g., hibernation, sweating).
- Water (e.g., plants wilting, animals seeking water).
- Gravity (e.g., root gravitropism, animal balance).
- Chemicals (e.g., plants responding to nutrients, animals detecting toxins).
- Other organisms (e.g., predation, symbiosis, competition).

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Explanation:

Question 24

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Question 25