The stages of gibberellin biosynthesis takes place various organelles and completed in various forms such as;

a) In the endoplasmic  reticulum GA12 is converted to GA53 by hydroxylation at C-13

b) In the cytosol GA12 is converted via 13-hydroxylation pathway into GA9 and further converted into GA4 by 3-β-Hydroxylation

c) In the cytosol GA53 is converted via 13-Hydroxylation pathway into GA20 and further converted into GA1 by 3-β-Hydroxylation

d) Hydroxylation at C-2 then converts GA4 and GA1 to the inactive forms GA34 and GA8, respectively

Which one of the following given combination from the above statements is true?

#Question id: 11418

#Unit 10. Ecological Principles

Use the following diagram of five islands formed at around the same time near a particular mainland, as well as MacArthur and Wilson's island equilibrium model principles

Which island would likely have the lowest extinction rate?

#Question id: 11419

#Unit 10. Ecological Principles

There are more species in tropical areas than in places more distant from the equator. This is probably a result of

a) more predators and parasites

b) more dispersed annual solar radiation compared to the poles

c) more frequent ecological disturbances over a longer time span

d) a longer time frame without disturbances for evolution and speciation

#Question id: 11420

#Unit 10. Ecological Principles

We can represent the relationship of species richness to area with the equation

Where S = number of species, and c and z are both constants

Which of the following is not a logical explanation to relationship of species richness to area?

#Question id: 11421

#Unit 10. Ecological Principles

The strength of the island biogeography model was that it generated several falsifiable predictions

A) The number of species should increase with increasing island size.

B) The number of species should decrease with increasing distance of the island from the mainland

C) The number of species on an island might remain the same, but the composition of the species should not be change

Which of the following above statement are correct?

#Question id: 11422

#Unit 10. Ecological Principles

The values of temperature and precipitation used to define climate zones correspond to the conditions of moisture and cold stress that are particularly important determinants of plant form. Which of following is correct combination of Biome?

#Question id: 11423

#Unit 10. Ecological Principles

Our ability to distinguish different biomes under similar conditions in different parts of the world depends primarily on which of the following factors that influence the distributions of growth forms?