MCQ
When one organism is benefited without affecting the other, the interaction is called as:
- AParasitism
- BCommensalism
- CSaprophytism
- DSymbiosis
Explanation:
In commensalism, one species is benefitted without the other being harmed. It is of two types periodic contact and continuous contact.
Some examples of periodic contact commensalism are jackal and hyenas accompanying big cats like tiger or lions for eating small bits of left over of prey's body; sucker fish attaches to underside of shark and feed on small left over when shark is feeding.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Statement $I$ : Bt toxins are insect group specific and coded by a gene cry $IAc$.
Statement $II$ : Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic $\mathrm{pH}$ of the insect gut.
In the light of the above statements, choose the correct answer from the options given below: