Geography · Environmental Studies

Oceanography and Hydrology

1,673 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 general knowledge resources of india and world animal husbandry and fishery green and white revolution agriculture in indian economy

The greatest share of fisheries comes from ______.

  1. Deep seas

  2. Continental shelves

  3. Deep oceans trenches

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

Continental shelves are shallow, sunlit areas that support high primary productivity, making them the most productive regions for marine life and commercial fisheries.

Multiple choice geography winds pressure belts elements of weather and climate :rainfall and air pressure monsoon phenomena and its mechanism

Why do coastal areas experience less contrasts in temparature conditions?

  1. Due to moderating effect of the seas

  2. Due to land mass

  3. Due to heat conditions

  4. Due to rotation of the earth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coastal areas experience less contrasts in temperature conditions due to moderating effect of the seas.  The large water bodies helps in moderating temperature. Water has a higher heat capacity than soil and rock, so the ocean takes much longer to heat and to cool than the land.

Multiple choice botany adapting to a habit adaptations - mangrove swamps, fast flowing rivers and treetops halophiles protecting our environment

Plants near seashore is an example of

  1. Halophyte

  2. Mesophyte

  3. Hydrophyte

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

Halophytes are salt lovers. They are the plants of saline habitats, which have not only the ability to tolerate high concentrations of salts in their rooting medium but are able to obtain their water supply from the same. Halophytes grow in saline soils like sea shores and marshes.

Multiple choice botany adapting to a habit adaptations - mangrove swamps, fast flowing rivers and treetops halophiles protecting our environment

Plants grow in saline water are known as 

  1. Lithophytes

  2. Halophytes

  3. Mesophytes

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

A halophyte is a plant, that grows in waters of high salinity, coming into contact with saline water through its roots or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs, and seashores.

Plants growing in habitats where water supply is absent or physiologically dry are called as xerophytes. 
Plants growing in the areas where water is not scarce or not abundant are called as mesophytes. 

Lithophytes are plants, that grow in or on rocks. In all of these, root hairs and root caps are very well developed. 

Multiple choice biology adapting to a habit adaptations - mangrove swamps, fast flowing rivers and treetops halophiles protecting our environment

Phosphorus of ocean becomes available to land plants due to

  1. Sea birds

  2. Deep sea activities

  3. Ocean spray

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Guano, which is the excrement of sea birds, is rich in phosphorus. When sea birds deposit this on land, it returns phosphorus from the marine food chain back to terrestrial ecosystems.

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.