Question

Which of the following do not cause disease in plants?
(a) Rat Trap
(b) Nematodes
(c) Fungi
(d) Bacteria

Answer 1

Hint: A pathogenic organism, such as a fungus, mycoplasma, virus, nematode,bacterium, viroid, or parasitic flowering plant, causes infectious plant diseases. An infectious agent has the ability to reproduce within or on its host and spread from one susceptible host to another.

Complete answer:
Plant disease usually impairs the normal state of plants, that is it interferes with vital function. different species are subjected to different types of disease. Diseases vary from season to season depending upon pathogens. A plant can be affected by more than one disease at a time.

Diseases can be of various types; it can include abiotic that is non living organisms and biotic that is living organisms.
• Abiotic damage is current mostly on all the plants for example drought or a chemical injury caused on plants.
• Abiotic damage does not spread from plant to plant where biotic disease can spread from neighbouring plant or by an agent.
• Biotic diseases show fungal growth, bacteria, ooze, or nematode cysts, or the presence of mites or insects.

Rat traps do not cause any disease. It is used to catch rats.
Plant diseases are a normal part of nature and these help in keeping hundreds of thousands of living plants and animals in balance with one another.

Hence the correct answer is option (a)

Note: Loss of crops from plant diseases result in hunger and starvation. especially in less-developed countries where access to disease-control methods is limited where the annual loss is 30 to 50 percent.