Clinically, the cell wall is important because it contributes to the ability of some species to cause disease and is the site of action of some antibiotics. In addition, the chemical composition of the cell wall is used 

#Question id: 11380

#XL - T Zoology

Which of the following is/are NOT valid explanation(s) for the observed pattern of species richness?

#Question id: 11380

#XL - R Botany

Which of the following is/are NOT valid explanation(s) for the observed pattern of species richness?

#Question id: 11382

#XL - R Botany

Ecologist has proposed following explanation to lead biodiversity at tropic.

a) Higher productivity in the tropics allows for more species

b)  Environments are more stable and predictable in the tropics, with fairly constant temperatures and rainfall levels year-round

c) Predators and pathogens limit competition in the tropics, which allows more species to coexist

d) High evolutionary speed at tropic than temperate

#Question id: 11384

#XL - R Botany

Two islands, P and Q, are similar in habitat and other features. They are 100 and 200 km2 in size respectively, but have the same number of species. Which of the following statements can independently explain this observation?

(i) P is closer to the mainland than Q

(ii) P is further away from the mainland than Q

(iii) P has higher speciation rates than Q

(iv) P has lower speciation rates than Q

#Question id: 11392

#XL - S Microbiology

Modes of obtaining nutrients, used by at least some bacteria, include all of the following except

#Question id: 11394

#XL - S Microbiology

Foods can be preserved in many ways by slowing or preventing bacterial growth. Which of these methods would not generally inhibit bacterial growth?