Answer:
Outermost layer
Explanation:
Onion epidermal cells act as a barrier against infections and fungus that might injure the delicate tissues. Onion epidermal cells are frequently used to educate children to botanical anatomy or to explain plasmolysis due to their simple and basic structure and transparency.Onion epidermal cells is used for cover onion from weather too.
Binary Fission: Binary fission, asexual reproduction by a separation of the body into two new bodies. In the process of binary fission, an organism duplicates its genetic material, or deoxyribonucleic acid (DNA), and then divides into two parts (cytokinesis), with each new organism receiving one copy of DNA.
Budding: Budding, in biology, a form of asexual reproduction in which a new individual develops from some generative anatomical point of the parent organism. In some species buds may be produced from almost any point of the body, but in many cases budding is restricted to specialized areas. The initial protuberance of proliferating cytoplasm or cells, the bud, eventually develops into an organism duplicating the parent. The new individual may separate to exist independently, or the buds may remain attached, forming aggregates or colonies.
Spores: Spore, a reproductive cell capable of developing into a new individual without fusion with another reproductive cell. Spores thus differ from gametes, which are reproductive cells that must fuse in pairs in order to give rise to a new individual. Spores are agents of asexual reproduction, whereas gametes are agents of sexual reproduction.
Vegetative Propagation: Vegetative propagation is a form of asexual reproduction of a plant. Only one plant is involved and the offspring is the result of one parent. The new plant is genetically identical to the parent.
Asexual Reproduction: Asexual reproduction (i.e., reproduction not involving the union of gametes), however, occurs only in the invertebrates, in which it is common, occurring in animals as highly evolved as the sea squirts, which are closely related to the vertebrates. Involves the division of the body into two or more parts (fragmentation) and the regeneration of missing body parts
<span><em><u>SOMATIC NERVOUS SYSTEM</u></em>
The neuron, a cell that composes the nervous system. For example a brain, an organ composed of thousands of neural fibers and glial cells that performs many important organismic functions.
Neurons are specialised cells that have dendrites, axons and terminal buttons that sends and receives stimuli from the environment and transduces it into a meaningful information and understand the complexities which the brain now functions. </span>
From the sensory organ received by the sensory neuron the message is sent to the brain and then back to the motor neuron to the muscle or organ responsible.
Cells exposed to environmental factors known to cause mutations in genetic material will <u>become cancer cells</u>
<u>Explanation:</u>
Environmental factors like radiation and high concentration of chemicals are among the factors that cause mutation in the genetic material. Internal genetic changes causes mutation in the genetic material, the DNA there are many chances of the mutated gene to convert into an Oncogene.
An Oncogene is a genetically mutated gene which causes tumor. The mutated gene causes proliferation of cells. More than 90% of the cancer is caused by the carcinogenic substances present in the environment.