Ecology and Environment
- Niche is Answer: 4. the functional role played by the organism where it lives Niche is the functional role of an organism in its habitat, including i... 1
- Which one of the following is related to Ex-situ conservation of threatened animals and plants ? Answer: 4. Wildlife Safari parks Ex-situ conservation protects species outside their natural habitat, for example in zoos, botanical gardens... 1
- Presence of plants arranged into well defined vertical layers depending on their height can be seen best in : Answer: 1. Tropical Rain Forest A tropical rain forest shows the best stratification, with well-defined vertical layers: emergent trees, can... 1
- Plants which produce characteristic pneumatophores and show vivipary belong to : Answer: 1. Halophytes Mangrove plants live in saline, waterlogged soil. They have pneumatophores (breathing roots) and show vivipary (seed g... 1
- Asymptote in a logistic growth curve is obtained when : Answer: 1. K = N In the logistic growth curve the upper asymptote is reached when the population size N equals the carrying capacity K , so... 1
- Which one of the following statements is not valid for aerosols ? Answer: 2. They cause increased agricultural productivity Aerosols are fine particles in the air. They change rainfall and monsoon patterns,... 1
- The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as : Answer: 4. Core zone A biosphere reserve has three zones. Core zone: legally protected, no human activity allowed. Buffer zone: limited rese... 1
- Mycorrhizae are the example of : Answer: 3. Mutualism Mycorrhizae are associations between fungi and roots of higher plants, and both partners benefit. The fungus absorbs ph... 1
- Which ecosystem has the maximum biomass ? Answer: 4. Forest ecosystem Key idea: Biomass depends on the amount and size of the living organisms. A forest has large trees and a very la... 1
- Alexander Von Humbolt described for the first time : Answer: 2. Species area relationships Key idea: Alexander von Humboldt studied plant diversity in South American forests. He found that spec... 1
- Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from Answer: 2. petroleum industry BOD measures the oxygen needed by microbes to break down organic matter, so it is a good index for organic was... 1
- A lake which is rich in organic waste may result in Answer: 3. mortality of fish due to lack of oxygen A lake with a lot of organic waste has a high microbial decomposition. The microbes use u... 1
- Which of the following National Parks is home to the famous musk deer or hangul? Answer: 3. Dachigam National Park, Jammu & Kashmir The Kashmir stag, called hangul, lives in Dachigam National Park in Jammu and Kashmir. Ke... 1
- The highest DDT concentration in aquatic food chain shall occur in Answer: 1. seagull DDT is not broken down and builds up at each higher trophic level (biomagnification). The seagull is the top consumer her... 1
- The principle of competitive exclusion was stated by Answer: 1. G. F. Gause The competitive exclusion principle was stated by G. F. Gause. It says two closely related species competing for the... 1
- Red List contains data or information on Answer: 2. threatened species The IUCN Red List documents the conservation status of threatened species of plants and animals, with categori... 1
- How many hot spots of biodiversity in the world have been identified till date by Norman Myers? Answer: 2. 34 Biodiversity hotspots are regions with very high species richness and many endemic species that are under threat. Norman Myers... 1
- Which of the following is correctly matched? Answer: 2. *Parthenium hysterophorus*—Threat to biodiversity Parthenium hysterophorus (carrot grass) is an invasive weed that threatens nati... 1
- The primary producers of the deep-sea hydrothermal vent ecosystem are Answer: 1. chemosynthetic bacteria No sunlight reaches deep-sea hydrothermal vents. The primary producers are chemosynthetic bacteria, which... 1
- Which of the following is correct for r-selected species? Answer: 4. Large number of progeny with small size r-selected species have a high intrinsic rate of increase: they produce a large number of... 1
- If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to Answer: 3. parasitism In parasitism the parasite benefits (+) and the host is harmed (−). Amensalism: 0, − Commensalism: +, 0 Mutualism: +,... 1
- Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers : Answer: 2. Ozone The ozone layer absorbs harmful UV-B radiation. When ozone is depleted, more UV reaches the earth and causes skin cancers a... 1
- A river with an inflow of domestic sewage rich in organic waste may result in : Answer: 4. Death of fish due to lack of oxygen. Sewage rich in organic waste is decomposed by microbes, which use up dissolved oxygen (high... 1
- The term ecosystem was coined by : Answer: 2. A.G. Tansley The term "ecosystem" was coined by A.G. Tansley (1935). Odum is known for ecosystem studies and the textbook "Fundam... 1