SCIENCE
BOTANY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Algae
|
|
|
Fungi
|
|
|
Protozoa
|
|
|
None of the above
|
Detailed explanation-1: -But let’s start with what we know about some of the very first living things on Earth. Cyanobacteria, also known as blue-green algae, started out on Earth quite a while ago. Possible fossil examples have been found in rocks that are around 3500 million years old, in Western Australia.
Detailed explanation-2: -(b) Algae are photosynthesizing eukaryotic organisms that contain only one cell. It is believed that they were the first forms of life to emerge on Earth. Hence, (b) is correct.
Detailed explanation-3: -The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old.
Detailed explanation-4: -The oldest chromophyte fossils, putative brown algae, are approximately 400 million years old. Coccolithophores, coccolith-bearing members of the Prymnesiophyceae, date from the Late Triassic (227 million to 201.3 million years ago), with one reported from approximately 280 million years ago.
Detailed explanation-5: -Ancestors of the Zygnematophyceae algae were the precursors of the first plants to grow on dry land.