Celebrating 1000 blog hits! B)

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Birthday Shoutout!!!

Have you seen today's Google doodle? It is made to a German physicist, Heinrich Rudolf Hertz who was born on February 22, 1857. So HAPPY 155TH BIRTHDAY, HERTZ!

For those who have never heard of Hertz before, here's a biography on him taken from http://www.ideafinder.com/history/inventors/hertz.htm

"Heinrich Rudolf Hertz, German physicist, born in Hamburg, and educated at the University of Berlin.  From 1885 to 1889 he was a professor of physics at the technical school in Karlsruhe and after 1889 a professor of physics at the University in Bonn.  Hertz clarified and expanded the electromagnetic theory of light that had been put forth by the British physicist James Clerk Maxwell in 1884.  Hertz proved that electricity can be transmitted in electromagnetic waves, which travel at the speed of light and which possess many other properties of light.  His experiments with these electromagnetic waves led to the development of the wireless telegraph and the radio. 

His name also became the term used for radio and electrical frequencies: hertz (Hz), as in kilohertz (kHz) or megahertz (MHz). The hertz designation has been an official part of the international metric system since 1933. Before Hertz gained professorships in Karlsruhe and Bonn, he had studied under the famous scientist Hermann von Helmholtz in Bonn, and it was Helmholtz who encouraged Hertz to attempt to win the science prize that led to some of Hertz's most important discoveries. From 1885 to 1889 Hertz became the first person to broadcast and receive radio waves, and to establish the fact that light was a form of electromagnetic radiation. (The Italian Marconi didn't begin his own wireless experiments until 1894, based on the earlier work of Hertz, Maxwell, and others.) Hertz probably would have gone on to make many more scientific contributions, but he died quite young, less than a month before his 37th birthday." 

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Photo of the Day!

Hi there! I decided to post something different today. A photo to share with you in regards to the previous post.

I asked my students to revise their notes on "Food and Its Importance" this morning as they will be having their assessment this coming Thursday. As I go around the class, these drawings made by one of the boys caught my attention. LOL! I find it amusing but somehow, I like it cause I do find it helpful for him to remember. I must say this is creatively smart of him to do this during my lesson. I must give him credit for that :)  BUT PLEASE DON'T TAKE THIS THE WRONG WAY STUDENTS! I don't want you to scribble something irrelevant to the topic I teach you at class! As I've suggested you during class, I want you start learning to take useful notes during my lesson in addition to the handouts I gave you cause it'll help you learn better.

So anyways, here's the photo that I took from this morning (with his permission)...

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"Yummy , yummy, yummy, I got love in my tummy~"

*stomach growl* Are you hungry? Wanna go grab something to eat now? Wait...what's your diet like? Are you eating the right foods? Today’s lesson is on “Food and Its Importance” as requested by one of my student. I hope he’ll be reading this post :) Alright, let’s just get right to it.

So the amount and type of food that we eat on a daily basis is very important to both health and performance. Food provides us the energy we need to do work, for growth, to build and repair damaged tissues, to keep us warm and helps our bodies to stay healthy. Not getting enough nutrients can lead to a variety of illnesses which shall be discussed later on.

The process of taking food into the body and using it for the living parts of the body is known as nutrition. There are 7 classes of food i.e. 

1) Carbohydrates     2) Proteins     3) Fats     4)Fibre (Roughage)    

5)Vitamins   6)Minerals    7)Water

1

 All of the above food groups with the exception of water are nutrients.

1)  Carbohydrates

Carbohydrates are the body’s main source of energy. We need energy for growth, movement and to keep us warm.

Carbohydrates can be classified into two types i.e. (i) Sugar (simple carbohydrate) and (ii) Starch (complex carbohydrate).

Simple carbohydrates or simple sugars can be found in foods such as fruits, chocolates, cakes, fizzy drinks and milks. They can provide a lot of energy for immediate use, but does not contain other useful nutrients like in a lollipop.

Complex carbohydrates or starches include rice, bread, potatoes, biscuits, pasta and cereals are good sources of energy. The body can easily store energy from carbohydrates for rapid use by the muscles. Starchy foods often also contain lots of useful vitamins, minerals and fibre.

However, eating too much carbohydrate can cause the excess glucose turns into fatty acids and be stored as body fat.

2)   Proteins

Proteins are needed for growth and the repair of body tissues. They are also needed for the formation of enzymes, hormones, haemoglobin and antibodies.

Examples of foods rich in proteins are egg white, meat, fish, nuts and beans.

Lack of proteins in your diet can cause kwashiorkor. The physical examination may show an enlarged liver and abdomen. To prevent kwashiorkor, make sure your  diet has enough carbohydrates, fat and protein.

3)   Fats

Fats are also used for energy, but only when stores of carbohydrate run low. Fat contains more than twice as much energy as carbohydrates. 

Fats are usually solids (e.g. butter, margarine and cheese). When the fat is liquid at room temperature, it is called oil. (e.g. cooking oil) 

Eating too much fat may lead to obesity, which is unhealthy.

4)   Fibre (roughage)

Fibre is also known as roughage which is made up of cellulose from plant cell walls. Fibre cannot be digested in our body. It holds a lot of water so that our faeces remains soft and can pass from our body easily. 

Fibre helps to prevent constipation which is a difficulty in passing out faeces from our body as a result of lack in fibre which causes the faeces to become hard and dry.

Examples of dietary fibre are whole wheat and grain products, fruits and vegetables.

5)   Vitamins

Vitamins are organic compounds needed in small amounts by our body for health and growth. A deficiency (lack) of vitamins will lead to certain diseases.

6)   Minerals

Minerals are inorganic substances needed in small amounts by our body in order to stay healthy.

7)   Water

Water makes up 70% of our body. It is the main components of our blood and body fluids. It is vitally important that you drink enough water.

Water carries substances around the body and helps to remove wastes. It is the medium for chemical reactions within the body.

Fluids include fresh water and all other liquids like fruit juice, soft drinks, coffee, tea, milk and soup. 

Milk is a mixture of nutrients with water. A mother’s milk is the most suitable food for the new born babies. Mother’s milk contains all the necessary nutrients to feed the baby properly and it is rich in antibodies, which protect the baby against diseases.

 Balanced diet

 

Everyone should try to eat a healthy, balanced diet. A balanced diet must contain all the 7 classes of foods (carbohydrate, protein, fat, fibre, vitamins, minerals and water) in the correct proportions. Each nutrient is needed for the proper functioning of the human body. The effects of not having a balanced diet can prove to be harmful to the body.

 

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Seed Dispersal

Hello there readers! It's been a while since my last update. So I've been teaching my students "Reproduction in Flowering Plants" for a couple of weeks now and I decided to post this sub-topic on "Seed Dispersal". Ready to learn yet? I think you might find this video pretty interesting :D Watch it till the end on how different seeds are dispersed. It's AMAZING how these different seeds have different structures or designs to help them move. B) But before you watch the video, may I suggest you read this brief lesson on seed dispersal? :)

Wait...do you even know the term seed dispersal? It means spreading of seeds from one place to another. So shall I start my lesson now? :) Plant seeds can be dispersed in a number of different ways according to its features.

Some seeds such as dandelion seeds and sycamore seeds are light and have a wing- or parachute-like structures to help them float or spin in the air. This method is known as wind dispersal.

Another way is water dispersal such as a coconut fruit and nipah fruit which has a fibrous husk that traps air and allows it to float on water. Some plants that grow near water may also transport their seeds by the moving water. 

In some plants such as bauhinia and saga, the seeds are in pods and can self dispersed. When the pods become dry, they split open and the seeds are scattered. Few plants like rubber seeds and squirting cucumber, they are designed to explode and scatter the seeds further away from the parent plant. WHAT?! SEEDS CAN EXPLODE BY THEMSELVES?? Yeah...see it to believe it! Watch the video posted below later. Getting more excited already? There's more...

Many plants can also use the animals to move seeds around. These plants may have hooks or spikes on them which can cling to the animal's fur before this animal drops them off elsewhere. For examples, burdock seeds and fruits of a love grass. On the other hand, the plants might have tasty, juicy, fleshy fruits with seeds which can be carried away and eaten by the animals such as tomatoes, watermelon, mangoes, papayas and so on. So that's animal dispersal.

It is better for the seeds to be dispersed some distance away from the parent plant. This will prevent overcrowding and competition for nutrients, water and light.

Alright then. Enjoy watching this video! Happy learning~ ;D

 

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Photosynthesis

Hi there readers! I promised my students that I'm gonna upload this video that i presented in class this week. They love this and you might like it too :)

But before that, I'm gonna give you a brief introduction to a plant process called photosynthesis. "Photo" is a Greek word for "light," and "synthesis" means "to combine."  We all get our energy from the food we eat which we get directly or indirectly from plants. How about plants? 

They use this process to make their own food. Photosynthesis can only occurs in the green parts of the plant. Leaves have tiny like structures called chloroplasts which contain a green pigment known as chlorophyll. The function of chlorophyll is to absorb sunlight and takes the carbon dioxide and the water, and turns them into sugar (glucose) and oxygen. The glucose provides the energy for the plant and the glucose can be converted into starch as food to be stored inside the plant. The oxygen which is the by product of photosynthesis will be released to the air through tiny pores called stomata found underside of the leaves.

So, photosynthesis can be defined as a process whereby green plants make food (glucose) using the raw materials carbon dioxide and water in the presence of sunlight. This process also releases oxygen.  Here's the word equation for photosynthesis:

Plants and animals (including us human) need each other to survive. We breathe out carbon dioxide which is needed for the plant during photosynthesis. Plants photosynthesize to make food and oxygen that we need. Other than oxygen used for respiration in living things, photosynthesis is also important whereby the oxygen released is used to purify the air by removing carbon dioxide in the atmosphere which can cause global warming.

Ok ok...enough already. Now it's time for you to enjoy the video. :))

 

Here are the lyrics for you to sing along! You might as well learn the lyrics...It's a fun way to learn! :D

If you want to know,

How a plant grows,

It takes water, air and sunlight,

and makes cellulose...

Every plant can do this,

Fundamental process,

and we can call this,

Photosynthesis!

Unlike me and you,

Plants need CO2,

and they make oxygen,

That stops us turning blue...

Every plant can do this,

Fundamental process,

and we can call this,

Photosynthesis!

It's a miracle,

How all the chlorophyll,

Captures sunlight in the leaves

of the plants and the trees...

A plant of any size,

Can do this if it tries,

But we're not green so we can't

Photosynthesize...

Every plant can do this,

Fundamental process,

and we can call this,

Photosynthesis!

It's a miracle,

How all the chlorophyll,

Captures sunlight in the leaves

of the plants and the trees...

Every plant can do this,

Fundamental process,

and we can call this,

Photosynthesis!

Every plant can do this,

Fundamental process,

and we can call this,

Pho-to-syn-the-sis! (photosynthesis)

Click the link below to test your knowledge of Photosynthesis!

http://www.growingthenextgeneration.com/agrium-games/quiz/index.htm

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