Life Processes in Organisms

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Questions and Answers

What is the process by which living organisms extract energy from food?

Excretion

Growth

Respiration (correct)

Movement

How do plants primarily respond to stimuli compared to animals?

Plants respond slowly, while animals respond quickly. (correct)

Plants respond more quickly than animals.

Plants and animals respond at the same speed.

Plants have no response to stimuli.

Which life process ensures the continuation of a species?

Reproduction (correct)

Respiration

Excretion

Movement

What is not a function of excretion in living organisms?

Getting rid of undigested food Signup and view all the answers

Which life process involves awareness of environmental changes?

Sensitivity Signup and view all the answers

Which of the following describes the growth of animals compared to plants?

Animals stop growing when they reach adulthood, while plants continue growing. Signup and view all the answers

Why is respiration crucial for all living organisms?

It provides energy for growth and cellular functions. Signup and view all the answers

What distinguishes excretion from egestion?

Egestion is part of the digestive process, while excretion is metabolic waste removal. Signup and view all the answers

What is the primary distinction between sexual and asexual reproduction?

Sexual reproduction requires union of gametes from two parents, while asexual involves one parent reproducing itself. Signup and view all the answers

How do plants obtain their nutrition?

Through photosynthesis using sunlight, carbon dioxide, and water. Signup and view all the answers

Which of the following best defines heterotrophic nutrition?

Organisms depend on other living things for sustenance and cannot produce their own food. Signup and view all the answers

What is the role of chlorophyll in photosynthesis?

It captures light energy for the conversion into chemical energy. Signup and view all the answers

Which type of heterotrophic nutrition involves organisms that feed on dead organic remains?

Saprophytic nutrition Signup and view all the answers

What is a characteristic feature of holozoic nutrition?

Organisms have a sophisticated digestive system for breaking down food. Signup and view all the answers

Which of the following correctly identifies autotrophs?

Organisms that can prepare their own food from inorganic sources. Signup and view all the answers

During photosynthesis, what happens to water molecules?

They are split into hydrogen and oxygen. Signup and view all the answers

Study Notes

Life Processes

Life processes define characteristics of living organisms, which are called organisms.
Seven essential life processes determine whether something is living or non-living.

Movement

Both animals and plants exhibit movement; animals move quickly while plants move slowly as they grow.
Plant movements include roots growing downward and stems reaching toward light.

Respiration

Respiration refers to energy extraction from food, taking place in the mitochondria.
Essential for growth, replacement of worn parts, and movement.

Sensitivity

All living organisms are sensitive to environmental changes, responding to stimuli like heat, light, and sound.
Animals generally react quickly, while plant responses are slower.

Growth

All living organisms experience growth; plants continue to grow throughout their lives, while animals stop growing at adulthood.
Replacement of materials occurs in the bodies of animals even after growth halts.

Excretion

Living organisms produce waste that must be expelled to avoid harm, known as excretion.
Plants remove waste through fallen leaves, while animals excrete carbon dioxide and waste products via urine and sweat.
Egestion, the removal of undigested food, is not classified as excretion.

Reproduction

Organisms must reproduce to ensure species survival.
Plants produce seeds for new plants, while animals reproduce through eggs or offspring.
Reproduction occurs in two forms:
- Sexual (involving two parents)
- Asexual (single parent reproduction)

Nutrition

Nutrition is crucial for energy and growth; plants are autotrophs that produce their own food via photosynthesis, while animals are heterotrophs relying on other organisms for nutrition.
Autotrophs convert inorganic substances into organic ones, while heterotrophs depend on consuming complex organic matter.

Autotrophic Nutrition

Organisms synthesize organic materials from inorganic sources, primarily using sunlight for energy.
Photosynthesis involves several steps: light absorption by chlorophyll, conversion to chemical energy, and carbon dioxide reduction to carbohydrates.

Heterotrophic Nutrition

Heterotrophs rely on autotrophs for nutrition, categorized into three types:
- Holozoic: Involves ingestion and digestion of complex food (e.g., humans, amoeba).
- Saprophytic: Involves feeding on dead organic matter (e.g., fungi).
- Parasitic: Organisms take nutrients from hosts without benefiting them (e.g., ticks, tapeworms).

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Description

Explore the seven essential life processes that distinguish living organisms from non-living entities. This quiz covers movement, respiration, sensitivity, growth, and more, highlighting how both plants and animals adapt and respond to their environments.