Wednesday, 29 March 2017

Science - Reproduction {continued}

Image result for asexual reproduction

Asexual Reproduction

What is asexual reproduction?
}Asexual reproduction is a form of multiplying in plants and animals. 

How does it occur or happen?
}It happens when one parent cell develops another cell which is called its "offspring", this type of reproduction means that it does not need two parents like sexual reproduction where a male & female is required to create offspring.

What are the different types of asexual reproduction in plants & in animals?
}Examples of asexual reproduction in plants are...
  • Fragmentation ~ which is when a piece of a plant such as the branch of a tree or the stem of another plant is replanted in the ground and the plant begins to grow.
  • Binary fission ~ happens when a parent cell splits itself into two daughter cells which are identical and the same shape and size.
  • Budding ~ when a parent cell produces offspring which grows attached to the parent cell until it is mature enough the offspring cell detaches it's cell from the parent cell.
}Examples of asexual reproduction in animals are...
  • Parthenogenesis ~ growth of offspring without the fertilization of sperm from male.
What are the benefits of asexual reproduction for plants & animals?
  • Easier way for farmers to grow their crops when supply and demand is high.
  • Great way to preserve plant and some animal species so they don't become extinct.

Wednesday, 1 March 2017

Functions of cell parts (organelles) - Cell

Science - Cell
*Organelles are cell structures that work together to carry out life processes. Fill in the sheet below to summarise the important organelles

Cell part (organelle)
Cell membrane
very thin transparent sheet.
holds everything inside & controls what comes in & out.
Cell wall
made of cellulose & only found in plants.
provides strength for the plant.
small dark circular spot.
The control centre for the cell & contains your genes.

Watery jelly like substance which fills most of the cell.
Holds cell organelles & contains nutrients & chemicals.
Water filled bubble.
Helps to keep the cell firm.
Small green structures found only in the green part of plants.
They make sugar for the plant.
Bean shaped organelle.
Carries out respiration to give cell energy.

Cell Structure - Cell

Science - Cell
*Another part of 'Cell' that we learnt about in science was.. Cell Structure.
Image result for simple plant cell

The difference between the animal cell (left hand side) and the plant cell (right hand side) is that the animal cell has only one layer of cell membrane compared to the plant cell which has two layers of cell membrane, the outer layer of the cell membrane on the plant cell is called a “cell wall”. Also the animal cell is smaller than the plant cell hence being another difference between the two cells.

Living & Non-living Things - Cell

Science - Cell
*As part of our unit in Science we are learning about the different areas of 'Cell' such as... Living & Non-living things.

  • They grow
  • They can move on their own
  • Living things have sensory organs
  • They can produce offspring (reproduce)
  • They can connect emotionally with other living things

Non - Living

  • They don’t grow
  • They can’t breathe
  • They can’t reproduce
  • They don’t interact socially with others
  • They can’t think like living things