Q19. In the context of ecosystem productivity, marine upwelling zones are important as they increase marine productivity by bringing the: 1. Decomposer microorganisms to the surface. 2. Nutrients to the surface. 3. Bottom-dwelling organisms to the surface. Which of the statements given above is/are correct?

There is a concern over the increase in harmful algal blooms in the seawaters of India. What could be the causative factors for this phenomenon? 1. Discharge of

Consider the following kinds of organisms: 1. Copepods 2. Cyanobacteria 3. Diatoms 4. Foraminifera Which of the above are primary producers in the food chains

With reference to the food chains in ecosystems, which of the following kinds of organism is/are known as decomposer organism/organisms? 1. Virus 2. Fungi 3. Ba

What would happen if phytoplankton of an ocean is completely destroyed for some reason? 1. The ocean as a carbon sink would be adversely affected. 2. The food c

With reference to food chains in ecosystems, consider the following statements: 1. A food chain illustrates the order in which a chain of organisms feeds upon e

Consider the following statements : 1. Most of the world's coral reefs are in tropical waters. 2. More than one-third of the world's coral reefs are located in

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements: 1. Biofilters provide waste treatment by removi

With reference to agricultural soils, consider the following statements: 1. A high content of organic matter in soil drastically reduces its water holding capa

Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower at

The acidification of oceans is increasing. Why is this phenomenon a cause of concern: 1. The growth and survival of calcareous phytoplankton will be adversely a

Microbial fuel cells are considered a source of sustainable energy. Why? 1. They use living organisms as catalysts to generate electricity from certain substrat

Consider the following statements: 1. Biodiversity is normally greater in the lower latitudes as compared to the higher latitudes. 2. Along the mountain gradien

Consider the following statements: 1. Some microorganisms can grow in environments with temperature above the boiling point of water. 2. Some microorganisms can

Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to 1. Resist drought and increase absorptive area

What is the use of biochar in farming? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medi

It is possible to produce algae based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry? 1. Production of al

The “Red Data Books” published by the International Union for Conservation of Nature and Natural Resource (IUCN) contain lists of 1. Endemic plant and animal sp

The FAO accords the status of ‘Globally Important Agricultural Heritage System (GIAHS)’ to traditional agricultural systems. What is the overall goal of this in

Consider the following activities: 1. Spreading finely ground basalt rock on farmlands extensively 2. Increasing the alkalinity of oceans by adding lime 3. Capt

Which of the following are nitrogen-fixing plants? 1. Alfalfa 2. Amaranth 3. Chickpea 4. Clover 5. Purslane (Kulfa) 6. Spinach Select the correct ans

In nature, which of the following is/are most likely to be found surviving on a surface without soil? 1. Fern 2. Lichen 3. Moss 4. Mushroom Select th

Which of the following are detritivores? 1. Earthworms 2. Jellyfish 3. Millipedes 4. Seahorses 5. Woodlice Select the correct answer using the code g

In which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrients to enter the cycle?

Which of the following have species that can establish a symbiotic relationship with other organisms? 1. Cnidarians 2. Fungi 3. Protozoa Select the c

With reference to the water on the planet Earth, consider the following statements: 1. The amount of water in the rivers and lakes is more than the am

Which of the following leaf modifications occur(s) in the desert areas to inhibit water loss? 1. Hard and waxy leaves 2. Tiny leaves 3. Thorns instead

The term ‘M-STrIPES’ is sometimes seen in the news in the context of