The Congo Basin is a large, tropical rainforest region in central Africa that spans across several countries. The main countries that make up the Congo Basin are:

1. Democratic Republic of the Congo (DRC) – It holds the largest portion of the Congo Basin and is home to a significant part of the rainforest.
2. Republic of the Congo – Also known as Congo-Brazzaville, this country has a substantial portion of the Congo rainforest.
3. Central African Republic – Located to the north of the Congo Basin, it contains part of the rainforest region.
4. Gabon – Although it has a smaller share, Gabon has a well-preserved part of the Congo Basin rainforest.
5. Cameroon – The southern part of Cameroon is part of the Congo Basin.
6. Equatorial Guinea – The mainland region of Equatorial Guinea (Río Muni) is included in the Congo Basin.

These countries collectively make up the Congo Basin region, which is the second-largest tropical rainforest in the world, after the Amazon. It is known for its rich biodiversity, complex ecosystems, and significant role in regulating the Earth’s climate. So, Cameroon is the correct answer.

India possesses substantial reserves of heavy minerals predominantly located along its coastal regions and in inland placer deposits. These heavy mineral sands include a collection of seven key minerals: ilmenite, leucoxene (also known as brown ilmenite), rutile, zircon, sillimanite, garnet, and monazite. Among these, ilmenite (FeO.TiO₂) and rutile (TiO₂) are the principal sources of titanium. Titanium dioxide is found in various polymorphic forms, namely rutile, anatase (octahedrite), and brookite. The correct answer is: Titanium.  

The deciduous status of the trees listed is as follows:

1. Jackfruit (Artocarpus heterophyllus): Evergreen tree, not deciduous.
2. Mahua (Madhuca indica): Deciduous tree, sheds its leaves annually.
3. Teak (Tectona grandis): Deciduous tree, sheds its leaves seasonally.

Based on the above information:

• Mahua and Teak are deciduous trees.
• Jackfruit is not a deciduous tree.

So, two of the listed trees are deciduous. The correct answer is: Only two

On evaluating each statement one by one:

• Jhelum River passes through Wular Lake: This is correct. The Jhelum River flows into the Wular Lake, which is one of the largest freshwater lakes in India, located in Jammu and Kashmir.
• Krishna River directly feeds Kolleru Lake: This is incorrect. Kolleru Lake, situated between the Krishna and Godavari deltas, is primarily fed by the seasonal Budameru and Tammileru rivers, not directly by the Krishna River.
• Meandering of Gandak River formed Kanwar Lake: This is correct. The Kanwar Lake, also known as Kabar Taal, is a natural oxbow lake formed by the meandering of the Gandak River in the Begusarai district of Bihar.

Based on the evaluation, two of the statements are correct. The correct answer is: Only two

Climate change significantly impacts biodiversity by altering ecosystems, species distributions, and the survival of both plant and animal life. Key ways climate change affects biodiversity include:

1. Habitat Loss and Fragmentation: Rising temperatures and changing precipitation patterns can alter or destroy natural habitats. For example, polar ice caps melting reduce habitats for species like polar bears, while coastal habitats are eroded by rising sea levels, affecting marine and bird species.
2. Changes in Species Distribution: As temperatures rise, many species are forced to migrate to cooler regions, either toward the poles or to higher altitudes. Species unable to move or adapt quickly face extinction. For instance, mountain species may lose habitable areas as the climate warms.
3. Disruption of Ecosystem Services: Ecosystems provide essential services such as pollination, water purification, and carbon storage. Climate change disrupts these services. For example, changing weather patterns can impact the flowering times of plants, which in turn affects pollinators like bees.
4. Altered Food Chains: Temperature shifts can affect species’ life cycles, leading to mismatches in food availability. If prey or plant species decline or change their reproductive timing, predator species may struggle to find food.
5. Increased Extinction Risk: Species that cannot adapt to rapid changes in climate, such as amphibians, corals, and some plants, face a higher risk of extinction. The International Union for Conservation of Nature (IUCN) predicts that climate change could contribute to the extinction of up to one million species in the coming decades.
6. Ocean Acidification and Coral Bleaching: As oceans absorb more CO₂, they become more acidic, affecting marine biodiversity. Coral reefs, home to about 25% of marine species, are highly vulnerable to bleaching caused by warmer waters and acidification, leading to declines in marine biodiversity.
7. Increased Invasive Species and Disease Spread: Warmer climates enable invasive species and pests to expand into new areas, often outcompeting native species. In addition, the spread of diseases, such as those affecting amphibians and marine organisms, is facilitated by changing environmental conditions.
8. Impact on Migration Patterns: Many species, particularly birds and marine animals, rely on stable climatic conditions to time their migration. Disruptions caused by unpredictable weather patterns can lead to reproductive failure or death.

Overall, climate change poses a major threat to global biodiversity, with far-reaching consequences for ecosystems, species survival, and human well-being.