p. 119 1a) a cell membrane is selectively permeable because it is selective about what it lets in and what it

keeps out B) the cell membrane allows some particles to pass through (like oxygen and water), but keeps

unwanted particles out. C) this function enables the cell to get what it requires to survive and remain healthy, without

letting in harmful or unwanted substances 2. Osmosis and diffusion both refer to the movement of particles from a high concentration to a low

concentration. However, osmosis only involves water and is vital for survival and health of cells. 3. Diffusion is the movement of particles in the air as well as through cells. Therefore, Martin should be

able to smell the popcorn and the pizza and the smell should get stronger as he gets nearer to the classroom.

4. The wilted carrots will become firm again by absorbing water through the process of osmosis. The water will move from an area of where there is more of it (the container) to an area of where there is less of it (the carrot)

5. Freshwater fish live in an environment where the concentration of water is higher than in their cells so water will diffuse into their cells by osmosis. Thus, freshwater fish have to get rid of this excess water from their cells. Saltwater fish live in an environment where the surrounding water will diffuse out of the cells into the surrounding seawater, so saltwater fish try to keep as much water in their bodies as possible.

When particles spread out from an area of high concentration to area of low concentration, it is classified as

A) diffusion B) transpirationC) permeableD) impermeable

2.5

Cells in Multicellular Organisms Combine to Form Tissues and Organs

What did Batman say to Robin before they got in the car? Robin, get in the car.

Specialized cells- cells that have specific structures that help them to perform particular functions that the cells of a multicellular organism must work

together to support life

Ex. Red blood cells- small, pliable cells that have no nucleus and are specialized for carrying oxygen to all the cells of the body.

Animal Tissue

All cells in humans can be categorized in four different tissue types: Nervous tissue Muscle tissue Connective tissue

Supports and connect Blood, fat, tendon, bone, cartilage

Epithelial tissue ‘blanket’ which covers the surface of the body and outside organs

Tissue in Plants

Plant cells are also organized into tissues, but plants have 3 tissue types:

1) Photosynthetic/ storage Example: Inside of a leaf

2) Protective Example: Outside portion of a leaf that is the waterproof layer

3) Transport- transportation of nutrients Phloem tissue- specifically allows sugar to travel to the rest of the

plant from leaves Xylem tissue- specifically allows water to travel to the rest of plant

from the roots

Tissue of the Root

XylemPhloem

Protective tissue

Transport Tissues

Photosynthetic/ Storage tissue

Organs in Plants

These tissues make up organs in plants Leaves Roots Stems

Leaves

Are the plant’s food-producing organs Where photosynthesis takes place Contains chloroplasts

Thin, allowing a large amount of light in Contains stomata

Tiny opening that allow air to enter the leafSpaces between leaf cells allow the air to flow and the

guard cells open and close the stomata

Tissue of the Leaf

Protective tissue

Protective tissue

Transport Tissues

Phloem Xylem

Photosynthetic Tissues

Stomata

Root System

How Does Water Move Up A Plant?

Plants need LOTS of water for A birch can drink 280 L of water PER DAY! Because of

loss through transpiration An oak tree can drink 380 L of water PER DAY! Because

of loss through transpiration Let’s watch celery drink food coloring! In comparison:

In respect adult elephants can drink 225 L of water per day! Us humans are to consume 1.5 liters- 4 liters per day depending on

how active we are

Animation form

Low pressure

High pressure

Homework!

P. 124 Check & Reflect 2, 3, 4

P. 125 Assess Your Learning 1, 2, 3, 6