Geography · Environmental Studies

Oceanography and Hydrology

1,743 Questions

Find relevant questions on oceanography and hydrology that address aquatic ecosystems and physical geography. The topics include coastal landforms, coral reefs, ocean salinity, and tidal patterns. These concepts frequently appear in civil services and state level administrative examinations.

Coral reef structuresCoastal landformsOcean salinity patternsGlacial retreat impactsMangrove ecosystems

Oceanography and Hydrology Questions

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Aquatic ecosystem covers how much of the earth's surface?

  1. 87%

  2. 23%

  3. 72%

  4. 49%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

About 72% of the land on the Earth is a part of the oceans. This water of the oceans, rivers, lakes and ponds contribute to the aquatic ecosystem. So, about 72% of the Earth's surface is covered under the aquatic form of ecosystems. There are two types of aquatic ecosystem, freshwater and marine ecosystem. 

Thus, the correct answer is option C. 

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Source of maximum sulphur in reservoir of sulphur is

  1. Ocean

  2. Lakes

  3. Rocks

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The ocean represents a major reservoir of sulphur on earth, with large quantities in the form of dissolved sulphate and sedimentary minerals (e.g., gypsum and pyrite). Sulphate is the most stable form of sulphur on earth; weathering and leaching of rocks and sediments are its main sources to the ocean. The majority of sulphur is found in seawater or sedimentary rocks especially pyrite rich shales and evaporite rocks. 

Therefore, the correct answer is option D.

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Source of maximum sulphur is/reservoir of sulphur is

  1. Ocean

  2. Lakes

  3. Land

  4. Rocks
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Source of maximum sulfur is/reservoir of sulfur is rocks. It is found in the form of iron pyrites, evaporite rocks in the form of anhydrite and baryte and calcium and magnesium carbonates.

Thus, the correct answer is 'Rocks.'

Multiple choice botany environmental factors soil-nature climate factors abiotic components

Salt concentration of the sea measured in parts per thousand is 

  1. 10-5

  2. 30-70

  3. 0-5

  4. 30-35
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The salt concentration of the sea is 3.5 %, which means it is about 30-35 ppm. So, this means that there are 35 gms of seawater for every 1 liter of water.

So, option D is the correct answer.

Multiple choice zoology environmental factors soil-nature climate factors abiotic components organisms and environment

Due to the increased average global temperature on fish populations, the fish will show
I. Movement from saline to fresh waters
II. Movement to deeper waters
III. Movement to higher latitudes

  1. I only

  2. II only

  3. III only

  4. I and II

  5. II and III
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Limited or no sunlight in deeper waters keep the temperature lower in the regions making it suitable for fishes when surface water become warm due to increasing in average global temperature. Likewise, higher latitudes maintain lower temperatures due to the angle of irradiance. Salinity does not affect the temperature range of water bodies. Thus, the correct answer is E.

Multiple choice chemistry change around us physical changes changes and their classification physical changes

The process of obtaining salt by the evaporation of sea water is a :

  1. chemical change

  2. physical change

  3. neutralisation

  4. galvanisation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process of obtaining salt by the evaporation of sea water is a process of crystallization which is a reversible process and a physical change, these crystals will convert again in salt solution (seawater) by dissolving them in water.


Hence the correct option is B.

Multiple choice maths circle measures area of a sector of a circle sector and arc of a circle area of sectors and segments

To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle $80^{\circ}$ to a distance of 16.5 km. The area of the sea over which the ships are warned is 190 $km^2$ (app.).

  1. True

  2. False

  3. Nither

  4. Either
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Area = (theta/360) * pi * r^2. Area = (80/360) * 3.14159 * (16.5)^2 = (2/9) * 3.14159 * 272.25 = 0.2222 * 855.6 = 189.97. This is approximately 190 km^2.

Multiple choice botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

Organism in estuary can concentrate on conversion of sun energy into;

  1. Food

  2. Organic matters

  3. Nutrients

  4. Water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Organisms in an estuary, particularly producers like phytoplankton and algae, convert solar energy into organic matter through photosynthesis. This organic matter forms the base of the estuarine food web.

Multiple choice social science oceans and fishing irrigation in india tanks and fisheries irrigation and power

______ in oceans is a more complex activity.

  1. Researching

  2. Diving

  3. Hunting

  4. Fishing
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fishing in the oceans is typically a very multifaceted action, you can imagine the high concentration hurricane usually present in the ocean, it may be very difficult for the fishermen to cop up the situation, this is because the boats used for fishing may be influenced by the storm to a point of leasing water into the boats and finally making the boats to overturn. 

Fishing is a major activity that can selectively remove a large portion of animal populations and also considerably change tropic connections. Fishing gear that drags the bottom at times, such as bottom-trawls, pots, and loglines, can alter marine habitats, especially benthic or reef habitats. 

Because fish populations change naturally, sometimes by orders of magnitude, separating the effects of fishing from natural and environmental unpredictability is difficult.

Thus, the correct option is D.

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Plants like Rhizophora and Avicennia grow on the sea shores under saline conditions. For this they have special roots for respiration which are called

  1. Floating roots

  2. Pneumatophores

  3. Climbing roots

  4. Prop roots
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pneumatophores are specialized root structures that grow out from the water surface and facilitate the aeration necessary for root respiration in hydrophytic trees such as many mangrove species (e.g., Avicennia germinans and Laguncularia raecemosa), bald cypresses, and cotton (Tupelo) gum (Nyssa aquatica). So, the correct option is "B" (Pneumatophores).

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Green plants are absent in deep sea. Why?

  1. Light is absent

  2. High pressure

  3. Low temperature

  4. Great depth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photosynthesis, which is essential for green plants, requires light. In the deep sea, light cannot penetrate, making it impossible for green plants to survive.

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Which one of the following is an example of a plant adapted to highly saline coastal conditions?

  1. Sonneratia acida

  2. Anaardium occidentale

  3. Taxus baccata

  4. Gnetum gemon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sonneratia acida is a mangrove species, which are plants specifically adapted to highly saline, waterlogged coastal environments. The other options are terrestrial plants not adapted to such conditions.