IAT (IISER) 2025 | Ecosystem Question 1 | Biology

Consider the following biomes: Tropical Rainforest $(P)$; Tundra $(Q)$; Desert $(R)$ and Coastal zone $(S)$. The most probable order of Net Primary Productivity of these biomes is

$\mathrm{P}>\mathrm{Q}>\mathrm{S}>\mathrm{R}$

$P>S>Q>R$

$Q>P>S>R$

$R>Q>S>P$

IAT (IISER) 2020

MCQ (Single Correct Answer)

-1

The following word diagram depicts a food chain in a forest.

$$ \text { Trees (Aspen, willow) } \rightarrow \text { Herbivore (Elk) } \rightarrow \text { Predator (Wolf) } $$

Which is the most likely outcome of depletion in predator population?

Increased browsing by the herbivores stimulates the plant growth leading to increased primary productivity

Overgrowth of herbivore population causing reduction in tree populations and therefore, if the process continues the entire ecosystem will breakdown

No change in the ecosystem as the herbivore and the tree populations will continue to maintain equilibrium

Overgrowth of herbivore population without any change in the remaining part of the ecosystem

IAT (IISER) Subjects

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Biology

Botany

Cell - The Unit of Life Biomolecules Cell Cycle and Cell Division Sexual Reproduction in Flowering Plants Microbes in Human Welfare Anatomy of Flowering Plants Mineral Nutrition Respiration in Plants Biotechnology: Principles and Processes Biodiversity and Conservation Morphology of Flowering Plants Photosynthesis in Higher Plants Principles of Inheritance and Variation Molecular Basis of Inheritance Organisms and Populations Ecosystem

Zoology

Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases