<u>Answer:</u>
<em>Double fertilization is a significant feature in angiosperms or flowering plants.
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<u>Explanation:</u>
The pollen grains carrying the sperm cells from a flower land on the stigma which is a <em>component of the female reproductive part of a flower.</em> The pollen grain contains the sperms and once the pollen lands on the stigma it grows pollen tub into the ovary through the style which is a tube connecting<em> stigma to ovary. </em>
Ovary contains ovule which contains egg cell as well as two polar nuclei and all these are haploid. The sperm in the pollen is also haploid. On the release of two sperm cells, one sperm fuses with the egg cell and the other sperm fuses with the two polar nuclei which results in the <em>formation of a diploid zygote</em> which is diploid and a triploid cell.
The diploid zygote develops into the embryo after cell division and the triploid cell develops into endosperm that provides nourishment to the embryo. Thus double fertilization becomes <em>significant in flowering plants.
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Answer:
Ribosomes produce proteins compared to stomach from which our body get proteins. Mitochondria is like the small intestine it converts food into nutrient essential for the cell
Explanation:
Ribosomes is one of a cellular organelle its manufacture protein this protein is synthesize by rough ER.Our Stomach also generate protein which is required by our body. Mitochondria converts food into nutrient which is needed by a cell.
Answer:
1. Antonie van Leeuwenhoek made the first microscope and used it to look at bacteria and study bacteria, and Robert Hooke studied cells and saw cavities in the cells that looked like small boxes - he discovered plant cells! he recognized cells as the basic unit of life, a basis for Cell Theory.
2. cell theory is: every living organism is made of one or more cells, cells are the smallest units of life ( that have the properties of a living thing), All cells come from other cells - all living things come from other living things. This relates to every living thing because all living things come under cell theory - like all living things are made of cells
3. prokaryotes, like bacteria, doesn't have a nucleus covered in a membrane. a eukaryotic cell, like an animal cell, has a membrane covered nucleus. just like the nucleus, in eukaryotes the organelles are not membrane bound. in prokaryotes, the organelles are membrane bound. In prokaryotes the DNA form is circular, while the DNA form in eukaryotes is linear. there are more, but i couldn't list them.
4. Example for prokaryote: the famous (or infamous) E. Coli bacterium. example for eukaryote: Humans!
5. Single-celled organisms (unicellular organisms) have all the functions necessary for their survival in the single cell. Multicellular organisms (many celled organisms), however, need many cells to survive and carry out all the functions necessary for their survival and do the different tasks each cell is supposed to do.
I hope this helped, please do correct me if I am wrong!
Explanation:
If you are talking about insects then they are called castes. hope this helps!
