Cells My name is Okoro the nucleus and I will be one of your guides during this topic. Cell size Cells structure and function Quiz

Cell structure and function previous next smart

Learning objective and outcomes To learn about plant and animal cells and function Outcome At the end of this session, pupils should be able to understand: cell sizes cell structure and functions the differences between plant and animal cells the importance of microscope in cell view Learning objective and outcomes previous next smart

Introduction Cells are the basic functional unit of life. Some of them exist independently. Two-thirds of a cell is water, which means that 2/3 of your whole body is water. The rest is a mixture of molecules, mainly proteins, fats and carbohydrates. Your body is constantly replacing old cells with new ones at the rate of millions per second. Cells are too small to be seen with the naked eye without a microscope. previous next smart

To help you understand their size try putting these How big are cells? To help you understand their size try putting these six objects in order with the largest first. nucleus Animal cell virus Plant cell chloroplast (part of a plant cell) ant previous next smart

How big are cells? 1 ant will fit on this pinhead Smallest Largest Viruses are even smaller even more chloroplasts 1 ant will fit on this pinhead 60 plant cells many more nuclei 100 animal cells Smallest Largest previous next smart

Lets take a microscopic look at one of the cells in the ant. These are called animal cells. cell membrane nucleus cytoplasm Hundreds of animal cells with irregular shapes. Lets take a look at just one animal cell. previous next smart

Lets take a closer look at one of the cells in the leaf. These are called plant cells. cell wall cell membrane vacuole nucleus chloroplast cytoplasm Hundreds of plant cells with regular shapes. Lets take a look at just one plant cell. previous next smart

Copy and complete these cells cell membrane chloroplast 4 1 nucleus 2 cell wall 5 cytoplasm 3 vacuole 6 Animal cell Plant cell previous next smart

Copy and complete these cells cell membrane chloroplast contains chlorophyll for photosynthesis lets substances into and out of the cell cell wall nucleus strong surface which keeps the cell in shape controls what goes on in the cell vacuole cytoplasm Animal cell The vacuole removes substances that might be harmful to the cell and maintains an acidic internal pH. The chemical reactions Which keep the cell alive take place in cytoplasm Plant cell previous next smart

Teachers instructions Short Quiz previous next smart

F A rigid regular structure with strong walls to maintain its shape cell membrane animal cell cytoplasm cell wall F A B C D E F G H vacuole chloroplast plant cell nucleus previous next smart

B 2. The control centre of any cell chloroplast cytoplasm cell wall vacuole A B C D E F G H B animal cell cell membrane plant cell nucleus previous next smart

B Small part of a cell which is needed for photosynthesis chloroplast cytoplasm cell wall vacuole A B C D E F G H B animal cell cell membrane plant cell nucleus previous next smart

C 4 Substances get in and out of the cell by passing through it. chloroplast cytoplasm cell wall vacuole A B C D E F G H C animal cell cell membrane plant cell nucleus previous next smart

A 5 The part that gives the cell a regular shape chloroplast cytoplasm cell wall vacuole A B C D E F G H A animal cell cell membrane plant cell nucleus previous next smart

C 6 A changing space which keeps a plant cell in shape chloroplast cytoplasm cell wall vacuole A B C D E F G H C animal cell cell membrane plant cell nucleus previous next smart

That’s all for now. Any questions? previous smart

Membranes allow things in and out of the cells Substances enter and leave the cell Substances enter and leave the cell return

The nucleus controls what goes on in the cell I’m in charge!!! return

Chloroplasts are found in plant cells. Chloroplasts absorb light and make food. What is the name of this process? return

Instructions for the Quiz The idea of this series of six questions is that they can be used as a plenary at the end of each section of the work on cells. The question is asked and the answers appear. After the answers have finished moving they will eventually come to rest in the eight boxes which are labelled A-H. The winner is the first pupil to identify the correct letter each time. The winner can be determined in a number of ways. The first person to shout out the correct letter. The first person to put their hand up and give the correct answer. The first person to hold up the correct letter from their cards. With this third option pupils could be given a printed copy of the work sheet which they can cut up before spreading the eight letters in front of them on the desk. The final way you could play the game just uses two sets of letters. Two pupils are chosen to play with the winner staying on and the loser passes their cards on to the next pupil who becomes the new challenger. The winner is the pupil who wins the final question. return worksheet

A B C D E F G H previous