Organism and Population MCQs for NEET — Botany Questions with Answers

The logistic population growth model, dN/dt = rN (K - N/K), describes a populations growth when an upper limit to growth is assumed. This upper limit to growth is known as the population's carrying capacity, and as N gets larger, dN/dt decreases.

(page-231)

All of the above mentioned statements with respect to population growth rate curve are correct.

(page- 230,231)

Connell’s field experiment was related to dominancy of large barnacles- Balanus over small balanus- Chathalamus on rocky sea coast.

(page-235)

All of the above statements are correct.

(page-235)

When a foreign bird is introduced into a new habitat, due to different feeding requirements, there is no competitor present, due to which it became a serious pest.

If two species compete for the same resource, they could avoid competition by choosing, for instance, different times for feeding or different foraging patterns. This is resource partitioning allows species facing competition to evolve mechanisms that promote co-existence rather than exclusion.

(page-235)

The r is called the ‘intrinsic rate of natural increase’ and is a very important parameter chosen for assessing impacts of any biotic or abiotic factor on population growth.

One organism prevent another organism from using the resource in interference competition.

(page-230)

According to the NCERT text, 'In both parasitism and predation only one species benefits (parasite and predator, respectively) and the interaction is detrimental to the other species (host and prey, respectively).' Therefore, one organism benefits, and the other is affected (harmed).

The NCERT text states: 'The life cycles of endoparasites are more complex because of their extreme specialisation. Their morphological and anatomical features are greatly simplified while emphasising their reproductive potential.' Therefore, less complex life cycles is incorrect.

The NCERT text asks, 'The female mosquito is not considered a parasite, although it needs our blood for reproduction. Can you explain why?' While the specific explanation isn't given there, the general characteristic of parasitic interaction is that the interacting species live closely together. A mosquito takes blood meal episodically, rather than living closely with or on the host for a prolonged duration, which is a key distinction from what is typically defined as parasitism in this context (e.g., a plant deriving nutrition from a host or an endoparasite living inside a host).