Living Things

Vocabulary 1.Cell 2.Homeostasis 3.Organism

Answer the following in your Science Notebook. Think about it. You walk outside and look up in the sky. You notice birds and clouds moving in the sky. Are the birds and clouds alive? *Name 3 ways you know something is alive. Use Your Noodle! You have 3 minutes!

What are living things like? Any living thing is called an organism. Organisms come in different sizes and are found just about everywhere. All organisms have some features in common. ▫These features include  Cells  The ability to grow  The ability to reproduce  A need for energy.

What is the smallest unit of an organism? One feature of living things is that they have one or more cells. ▫Cell – the smallest unit of an organism that carries on the function of life. Cells use materials from their surroundings in many ways. Each cell has an orderly structure. ▫Also contains instruction for cellular organization and function in its hereditary material

How do living things grow and develop? Growth in a one-celled organism is because of an increase in the size of the cell ▫Growth in a many-celled organism is because of an increase in the number of cells. ▫For example, the number of cells increase as a puppy grows into an adult dog.

How do living things grow and develop? Organisms change as they grow ▫These changes are called development Puppies can’t see or walk when they are born. ▫8 or 9 days, they open their eyes and legs are strong enough to hold them up.

How do living things grow and develop? The length of time an organism is expected to live is called it’s life span Some bristle cone pine trees have been alive more than 4,600 years Human life span is about 80 years. A mayfly lives only one day.

Answer the following in your Science Notebook. Identify: What is development? Use Your Noodle! You have 2 minutes!

Why do living things respond to stimuli? Living things must interact with its surroundings. Anything that causes change in an organism is a stimulus. The reaction to a stimulus is a response. Often, that response results in movement. ▫An organism must respond to stimuli to carry on its daily activities and to survive.

Name types of stimuli?

How do living things maintain homeostasis? Living things also must respond to stimuli that occur inside them ▫Example: an organism makes internal changes to maintain the right amounts of water and food in its cell. ▫The regulation of an organism’s internal condition that keeps it alive despite changes in its environment  This is called homeostasis  Homeostasis is a trait of all living things.

Answer the following in your Science Notebook. Explain: Why is homeostasis important to organisms? Use Your Noodle! You have 2 minutes!

Why do living things need energy? An organism needs energy to live. Carrying on activities like finding food requires energy. The energy used by most organisms comes directly or indirectly from the Sun.

Why do living things need energy? Plants and some other organisms use the Sun’s energy, carbon dioxide and water to make food. Humans cannot directly use the Sun’s energy. ▫Instead you eat food as a source of energy. ▫Organisms that do not get energy from the Sun must take in Oxygen to release energy in foods.

Why do living things reproduce? All living things reproduce to make more of their own kind. ▫Some bacteria reproduce every 20 minutes! ▫A pine tree may take 2 years to produce seeds. Without reproduction, living things would not exist to replace those individuals that die. ▫One human can live its entire life without reproducing.  But if humans never reproduces, all humans would disappear.

Answer the following in your Science Notebook. Analyze: What is the purpose of reproduction? Use Your Noodle! You have 2 minutes!

What do you need to survive? NOT

What do living things need? All organisms need a place to live that meets their unique requirements ▫Need enough space to grow and develop ▫How well do flowers do in a bed full of weeds?

Living things need water. All living things need water ▫It performs many functions  Helps to move materials between cells  Organisms can take in water from their surroundings. ▫All organisms take in and give off large amounts of water each day. ▫Homeostasis balances the amount of water exchanged.

Answer the following in your Science Notebook. Infer: How does a corn plant take in water? Use Your Noodle! You have 2 minutes!

Living things need a food source. All organisms need a food source to live. ▫Living things are made up of materials such as proteins, fats, and sugars. ▫Animals take in these materials when they eat.

Living things need a food source. Plants and some bacteria make their own food. When organisms die, the materials in their bodies are broken down and released into the air and soil. The material is can then be used again by other living organisms.

Review!! 1.Complete the concept map below to show what all living things have in common. What all organism have in common. 1. Organized into cells Need a place to live, water and food 6. 7.