WORKSHEET
Class 9 Geography (Part-2)
Chapter 1: Water in the Oceans
Section A: Multiple Choice Questions
Oceans cover about _____ of the Earth's surface.
a) 51%
b) 61%
c) 71%
d) 81%
Which is the largest ocean?
a) Atlantic Ocean
b) Indian Ocean
c) Southern Ocean
d) Pacific Ocean
The main source of fresh water through the water cycle is:
a) Rivers
b) Lakes
c) Oceans
d) Glaciers
Which ocean relief feature is rich in fish and mineral resources?
a) Abyssal Plain
b) Continental Shelf
c) Ocean Trench
d) Guyot
The deepest part of the ocean is:
a) Mid-Ocean Ridge
b) Continental Rise
c) Mariana Trench
d) Kerguelen Plateau
Coral reefs are formed by:
a) Fish
b) Corals
c) Seaweeds
d) Crabs
Waves are mainly caused by:
a) Earthquakes
b) Wind
c) Tides
d) Moon
Which tide occurs during Full Moon and New Moon?
a) High Tide
b) Low Tide
c) Spring Tide
d) Neap Tide
Ocean currents are:
a) Standing water
b) Streams of flowing ocean water
c) Ocean waves
d) Ocean trenches
Deep-water currents are also called:
a) Surface Currents
b) Tidal Currents
c) Thermohaline Currents
d) Warm Currents
Section B: Fill in the Blanks
- Oceans contain nearly _______% of the world's water.
- The _________ Ocean is the largest ocean.
- The __________ Shelf is the submerged extension of a continent.
- __________ Plain is the flattest region of the ocean floor.
- The Mid-Atlantic Ridge is an example of an oceanic __________.
- The highest point of a wave is called __________.
- The lowest point of a wave is called __________.
- Tides occur due to the gravitational pull of the __________ and Sun.
- Warm currents move water from the __________ regions.
- __________ Reefs surround a lagoon in a ring shape.
Section C: True or False
- Oceans influence climate and weather. _______
- Continental slope is flatter than the continental shelf. _______
- Guyots are flat-topped underwater mountains. _______
- Tsunamis are caused by underwater earthquakes. _______
- Neap tides occur during Full Moon. _______
- Surface currents are mainly driven by winds. _______
- Ocean currents do not affect climate. _______
- Coral reefs support biodiversity. _______
- Overfishing can reduce fish stocks. _______
- Sustainable fishing helps conserve marine resources. _______
Section D: Match the Following
Column A Column B
1. Continental Shelf a. Deepest ocean feature
2. Mariana Trench b. Ring-shaped coral reef
3. Crest c. Rich fishing ground
4. Atoll d. Highest point of wave
5. Gulf Stream e. Warm current
Section E: Assertion and Reason
Q1
Assertion (A): Coral reefs are important for biodiversity.
Reason (R): Coral reefs provide habitat for many marine organisms.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Q2
Assertion (A): Warm currents increase rainfall in nearby coastal regions.
Reason (R): Warm currents add moisture to the atmosphere.
Q3
Assertion (A): Overfishing affects marine livelihoods.
Reason (R): Overfishing reduces fish populations.
Q4
Assertion (A): Tides are important for navigation.
Reason (R): High tides allow ships to enter and leave harbours safely.
Q5
Assertion (A): Ocean relief helps scientists study plate tectonics.
Reason (R): Ocean floor features reveal tectonic activity.
Section F: Very Short Answer Questions
- Name the five major oceans.
- What is ocean relief?
- Define continental shelf.
- What are ocean trenches?
- What is a seamount?
- Define coral reef.
- What is a wave?
- What is a tide?
- Define ocean current.
- What are marine resources?
Section G: Short Answer Questions
- Explain how oceans influence climate.
- Write any three uses of oceans.
- Differentiate between continental shelf and continental slope.
- Explain the formation of Mid-Ocean Ridges.
- Describe the importance of coral reefs.
- Explain the causes of tides.
- Describe the parts of a wave.
- Differentiate between warm and cold ocean currents.
- Explain any three effects of ocean currents.
- What are marine biological resources?
Section H: Long Answer Questions
- Explain the major features of ocean relief.
- Describe the types and importance of waves.
- Explain the causes, types, and importance of tides.
- Discuss the causes, types, and effects of ocean currents.
- Explain the significance of marine resources.
- Discuss the livelihood concerns and challenges faced by coastal communities.
Section I: Case Study Based Questions
Case Study 1: Ocean Relief and Marine Life
Scientists have discovered that different ocean floor features support different forms of marine life. Continental shelves are rich fishing grounds because sunlight reaches shallow waters, allowing plankton to grow. Coral reefs provide habitats for thousands of marine species. Deep ocean trenches, although extreme environments, also support unique organisms adapted to high pressure. Ocean relief also influences ocean currents and the distribution of nutrients.
Questions
- Why are continental shelves important for fishing?
- How do coral reefs support marine biodiversity?
- Which ocean relief feature is the deepest?
- How does ocean relief influence ocean currents?
- Mention one importance of ocean relief.
Case Study 2: Climate Change and Coastal Livelihoods
Many coastal communities depend on fishing and tourism for income. Rising sea temperatures are affecting fish migration and breeding. Coral bleaching has damaged reefs in several regions. Sea-level rise and stronger storms have increased the vulnerability of coastal settlements. Many fishers now face lower catches and economic difficulties.
Questions
- Name two livelihoods dependent on oceans.
- How does rising sea temperature affect fish populations?
- What is coral bleaching?
- Mention one effect of sea-level rise.
- Suggest one measure to protect marine livelihoods.
Case Study 3: Marine Resources and Sustainable Development
Oceans provide food, minerals, energy, transportation routes, and employment. However, overfishing, pollution, and unsustainable extraction of resources threaten marine ecosystems. Governments and organizations are promoting sustainable fishing, marine protected areas, pollution control, and renewable marine energy to conserve ocean resources for future generations.
Questions
- Name any two marine resources.
- How does overfishing affect marine ecosystems?
- What are Marine Protected Areas (MPAs)?
- Why is marine conservation important?
- Mention two sustainable solutions for protecting marine resources.
Section J: HOTS (Creative Thinking )
- Why would life on Earth be difficult without oceans?
- How can climate change affect the future of marine resources?
- Why is sustainable fishing important for future generations?
- How are waves, tides, and currents interconnected?
- Suggest a plan to reduce marine pollution in your locality.
- c) 71%
- d) Pacific Ocean
- c) Oceans
- b) Continental Shelf
- c) Mariana Trench
- b) Corals
- b) Wind
- c) Spring Tide
- b) Streams of flowing ocean water
- c) Thermohaline Currents
- 97%
- Pacific
- Continental
- Abyssal
- Ridge
- Crest
- Trough
- Moon
- Equatorial
- Atolls
- True
- False
- True
- True
- False
- True
- False
- True
- True
- True
- a
- a
- a
- a
- a
- Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean, Arctic Ocean.
- Ocean relief refers to the physical features found on the ocean floor.
- Continental shelf is the gently sloping submerged extension of a continent.
- Ocean trenches are deep, narrow depressions in the ocean floor.
- A seamount is an underwater volcanic mountain that does not reach the surface.
- A coral reef is an underwater structure formed by corals.
- A wave is the rhythmic rise and fall of ocean water.
- A tide is the regular rise and fall of ocean water caused by the Moon and Sun.
- Ocean currents are continuous streams of ocean water flowing in a particular direction.
- Marine resources are natural resources obtained from oceans and seas.
- Wind Waves
- Swell Waves
- Tsunami Waves
- Storm Surges
- Mix ocean water.
- Bring nutrients and oxygen.
- Shape coastlines.
- Generate wave energy.
- Moon's gravity
- Sun's gravity
- Earth's rotation
- High Tide
- Low Tide
- Spring Tide
- Neap Tide
- Navigation
- Fishing
- Electricity generation
- Coastal ecosystem support
- Wind
- Temperature differences
- Salinity differences
- Earth's rotation
- Continental boundaries
- Warm Currents
- Cold Currents
- Surface Currents
- Deep Water Currents
- Effects:
- Influence climate
- Bring rainfall
- Support fishing
- Cause fog
- Because they are rich in fish and plankton.
- They provide habitats for marine species.
- Ocean trench (Mariana Trench).
- It affects the movement and direction of currents.
- Supports marine biodiversity.
- Fishing and tourism.
- It affects fish breeding and migration.
- Whitening and damage of corals due to rising temperatures.
- Coastal flooding and erosion.
- Promote sustainable fishing and marine conservation.
- Fish and petroleum.
- It reduces fish stocks and biodiversity.
- Protected marine areas created for conservation.
- To protect marine ecosystems and resources.
- Sustainable fishing and pollution control.
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