WATER  CYCLE
The water cycle is the circulation of water on Earth. It takes some steps:

1. The Sun heats up water from rivers, oceans, lakes and seas.
2. The water transforms into water vapour.
3. The water vapor cools and forms droplets in the atmosphere.
4. The droplets become clouds.
5. The clouds release the droplets as rain, snow or hail.
6. Water from rain or snow flow over the surface and return to rivers, oceans, seas, and lakes.

Here you have a lesson and interactive game:

Click here for more information:

PLANTS: NUTRITION

Plants are living things.

Nutrition is one of the basic life processes to all living things. The nutrients that living things obtain provide energy to the organism.
Remember that nutrition includes to breathe and to eat.

• to BREATHE: exchange of gases in an organism, it is also called RESPIRATION. Plants take oxigen (O2) from the air and release carbon dioxide (CO2), exactly like people do. Plants need to breathe all day and night, exactly like people do.

• to EAT: plants are autotrophos, this means that they can make their own food. The process in which plants make their food is called PHOTOSYNTESIS. Photosyntesis only occurs during the day because it is necessary sunlight.

 

Here you have some videos about this process:

 

PLANTS: REPRODUCTION

Flowering plants are those which reproduce by flowers. Plants that have flowers reproduce from seeds.

FLOWERS are the reproductive organs in the plant; they can be female or male:

• female organ: it is called carpel and it is formed by the stigma and the ovary; inside the ovary there are ovules.
• male organ: it is called stamen and it produces pollen.

 

POLLINATION is the movement of pollen from the stamens to the ovary. It usually takes place in the same plant. However, wind and insects also carry pollen to other plants.

This is a simple video about pollination:

 

FERTILIZATION is when the pollen reaches the ovule inside the ovary. The fertilized ovule transforms into a seed. The petals fall off the flower and the ovary develops into a fruit.

Let´s see an interesting video about fruit development:
 

 

GERMINATION is the process by which a seed landed on the ground can grow into a new plant. For a seed to germinate, the ground must be wet and the temperature must be warm.

 

The REPRODUCTION PROCESS is a cycle (no beginning no end).
Flowers are the reproductive organs in which pollen and ovules are formed. Polen and ovules mix in an act called pollination and the flower transforms into a fruit. Fruits contain the seeds. Seeds fall to the soil and germinate that is, a new plant can grow.

Let´s see a video that summarizes all these concepts:

PLANTS

Plants are living things, so they carry out the three life processes:

• nutrition
• interaction
• reproduction

We can classify plants intro three groups:

• grasses
• bushes
• trees

We can see three different parts on a plant:

Flowers are the reproductive organs of a plant. They contain:

• stamens: they produce pollen.
• carpel: the seeds develope into the carpel. The carpel grows into a fruit.
• petals: they protect the stamens and carpel. They are coloured.
• sepals: they protect the petals.

Fruits are the part of the plant that develope from the flower. The fruit contains the seeds of the plant.

It covers and protects the seeds. A fruit can have fleshy or dry tissue.

Seeds are inside the fruit. Fruits can have:

• only one seed called stone.
• several seeds that can be soft or hard.

 

Plants life cycle. Plants need water, sunligh, air and minerals from the soil to grow.

PLANTS AND PEOPLE

Uses of plants:

• Food: we can eat fruits, seeds, leaves, stems, roots and flowers.
• Materials: we can obtain wood, paper, fibres and resins.
• Oxygen: plants release oxygen when they perform the photosynthesis.
• Agriculture: we can grow plants.
• We plough the soil.
• We plant seeds.We water the soil and plants.
• We protect from pests.
• We harvest the fruits.

SI LAS PLANTAS HACEN LA FOTOSÍNTESIS A TRAVÉS DE LAS HOJAS, ¿QUE PASA EN INVIERNO, NO SE ALIMENTAN?

Me habéis hecho esa pregunta en clase y me he quedado un poco traspuesta, intuía la respuesta pero no estaba segura. He buscado la solución en varios sitios y parece que coincide. Os cuento:

En invierno no hay la suficiente luz o agua como para hacer la fotosíntesis. Los árboles descansarán y vivirán con el alimento que almacenaron durante el verano.

Esta y más información en los siguientes enlaces:

FOTOSINTESIS TIC CIENCIA