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Olympiad Test: Natural Resources- 3


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10 Questions MCQ Test Science Olympiad Class 9 | Olympiad Test: Natural Resources- 3

Olympiad Test: Natural Resources- 3 for Class 9 2023 is part of Science Olympiad Class 9 preparation. The Olympiad Test: Natural Resources- 3 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: Natural Resources- 3 MCQs are made for Class 9 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Natural Resources- 3 below.
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Olympiad Test: Natural Resources- 3 - Question 1

Green plants in an ecosystem are called

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 1 In the ecosystem, producers are those organisms which are capable of preparing their own food. Green plants are called producers as they manufacture their own food through the process of photosynthesis.
Olympiad Test: Natural Resources- 3 - Question 2

Match the column A with column B

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 2

Hydrophytes are aquatic plants that live in water and are evolutionarily suited to thrive in aquatic environments. Hydrilla, also called water thyme is a submerged hydrophyte, which is a troublesome aquatic weed at many places.

In their natural habitats rats are primarily nocturnal—the brown rat is a prominent exception, being active day and night in both urban and rural environments. All rats are terrestrial, and many are also arboreal.

Horses have good vascularization, meaning there are lots of blood vessels going to large muscles. This allows for both explosive power and endurance power. All of these things combine to make horses run at a high speed.

To help them adapt to the ocean, whales developed echolocation, thick layers of blubber, modified lungs, better hearing, and larger arteries, among other things, to ensure their survival and prosperity.

Olympiad Test: Natural Resources- 3 - Question 3

In nitrogen cycle which bacteria are responsible for nitrification

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 3 In nitrogen cycle Nitrosomonas & Nitrobacter bacteria are responsible for nitrification) During nitrification, the nitrogenous wastes from dead plants and animals are converted into ammonia by the action of bacteria such as Bacillus ramosus, Clostridium spp. etc.

The microbes which carry out biological nitrogen fixation are commonly called biological nitrogen fixers. for eg: Rhizobium and Azotobacter.

Olympiad Test: Natural Resources- 3 - Question 4

Nitromonas bacteria convert

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 4 The nitrification process requires the mediation of two distinct groups: bacteria that convert ammonia to nitrites (Nitrosomonas, Nitrosospira, Nitrosococcus, and Nitrosolobus) and bacteria that convert nitrites (toxic to plants) to nitrates (Nitrobacter, Nitrospina, and Nitrococcus).
Olympiad Test: Natural Resources- 3 - Question 5

What would happen, if all land and water present in the environment is converted to ozone?

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 5 Ozone is triatomic `[O_(3)]` allotrope (occurrence of one element in more than one form) of oxygen. It is a blue gas with purgent odour and is highly poisonous to the living system. It is present in stratosphere region of atmosphere however, it does not exists in the lower atmosphere region called troposphere, hence does not show any fatal effect on life form. It its value in the atmosphere increases the appreciable amount, it may becomes fatal, i.e., becomes poisonous and will kill all the living forms.
Olympiad Test: Natural Resources- 3 - Question 6

Which of the following soil is transported by air?

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 6 Transported soils are brought from other places under the influence of gravity (Colluvial), running water (Alluvial), wind (Eolian) and glaciers (Glacial soil).
Olympiad Test: Natural Resources- 3 - Question 7

Signs of eutrophication of water bodies include

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 7 Eutrophication is characterized by excessive plant and algal growth due to the increased availability of one or more limiting growth factors needed for photosynthesis (Schindler 2006), such as sunlight, carbon dioxide, and nutrient fertilizers.
Olympiad Test: Natural Resources- 3 - Question 8

Nif genes occur in

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 8 Nif genes (Nitrogen fixing gene) are present in the soil bacterium Rhizobium which symbiotically fixes atmospheric nitrogen in the roots of leguminous plants.
Olympiad Test: Natural Resources- 3 - Question 9

The conversion of NO3 to N2 is called

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 9 De-Nitrification: Nitrogen in its nitrate form (NO3–) is converted back into atmospheric nitrogen gas (N2) by bacterial species such as Pseudomonas and Clostridium, usually in anaerobic conditions.
Olympiad Test: Natural Resources- 3 - Question 10

The two forms of oxygen found in the atmosphere are

Detailed Solution for Olympiad Test: Natural Resources- 3 - Question 10 The two forms of oxygen found in the atmosphere are

Oxygen, O2

Ozone, O3 is found upper layer of the atmosphere.

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