Test: Reproduction in Organisms - September 27, 2022 - NEET MCQ

The period from birth to natural death of an organism is known as its life span. It varies from few years to thousand years, depending on the organism.

Clones are organisms with the same genetic and morphological similarities. It can be carried out naturally and artificially. Asexual reproduction is an example of natural cloning. Artificial cloning is carried out in labs. In biotechnology cloning can refer to DNA fragments or cell copies.

Water hyacinth is a water weed that grows on still water. It drains out all the oxygen from the water bodies which is extremely fatal for the marine organisms. It is very difficult to get rid of them because even if leaves behind a single bud, it will start multiplying at a great speed.

The site of origin in rhizomes is from nodes present in modified stems. Examples of plants that give rise to new plantlets from nodes: potatoes (the nodes on potatoes are also called nodes) and ginger.

Adventitious buds arise from the margin of the leaves in Bryophyllum. Those buds give rise to new plants that fall of when they are capable enough to grow on their own. This unique ability has been exploited by the gardeners and farmers.

The general term for the period of growth is known as juvenile phase. In plants it is known as the vegetative phase. The end of juvenile phase marks the beginning of reproductive phase.

Hydra reproduces by forming buds externally. It grows and develops tentacles. It eventually separates from the parent and lives an independent life. This process may also be known as fragmentation in hydra since a part of it falls of and starts growing independently.

Amoeba undergoes the phenomenon of encystation. Under unfavorable conditions, amoeba withdraws its pseudopodium and secretes a cyst that covers it.

Lolium multiflorum also known as lawn grass is a type of runner. Narcissus is a plant that reproduces by bulb formation, like onions and the other 2 are plants that reproduce by adventitious buds.

Budding is the process of formation of small mini structures similar to the parent that grow to an extent and then falls off to grow independently. It is also called torulation in yeast as a parent cell. Buds bearing buds resemble a fungi genus Torula.