Introduction to the Topic

Welcome to another exciting journey through your NCERT textbooks! In Class VII Geography, Chapter 6 introduces us to the fascinating world of Natural Vegetation and Wildlife. Have you ever wondered why certain plants grow only in specific regions? Or why polar bears are found only in snowy areas and not in the tropical rainforests? The answer lies in the delicate relationship between temperature, moisture, and the life forms that inhabit our planet. Natural vegetation refers to plant community that has grown naturally without human aid and has been left undisturbed by humans for a long time. Wildlife includes all the wild animals, birds, and aquatic life found in these natural habitats. Together, they form the foundation of our biosphere, providing us with oxygen, raw materials, and a balanced ecosystem that sustains all life on Earth.

Key Concepts Explained

To understand natural vegetation and wildlife, we must first look at the factors that influence their growth. The growth of vegetation mostly depends on temperature and moisture. It also depends on factors like slope and thickness of soil. Based on these factors, the natural vegetation of the world is broadly classified into three major categories: forests, grasslands, and shrubs.

1. Forests

Forests grow where temperature and rainfall are plentiful to support a tree cover. Depending on the climatic conditions, forests are further divided into:

  • Tropical Evergreen Forests: These dense forests occur in the regions near the equator and close to the tropics. They receive heavy rainfall throughout the year and do not shed their leaves all at once, hence they always appear green. Common trees include rosewood, ebony, and mahogany.
  • Tropical Deciduous Forests: These are the monsoon forests found in the large part of India, northern Australia, and in central America. They shed their dry leaves in the dry season to conserve water. Important trees include sal, teak, neem, and shisham.
  • Temperate Evergreen Forests: Located in the mid-latitudinal coastal region, these forests comprise both hard and soft wood trees like oak, pine, and eucalyptus.
  • Temperate Deciduous Forests: As we go towards higher latitudes, there are more temperate deciduous forests. They shed their leaves in the dry winter months. Common trees include ash, beech, and oak, along with animals like foxes and wolves.
  • Mediterranean Vegetation: Found in areas around the Mediterranean Sea in Europe, Africa, and Asia, these regions are marked by hot dry summers and mild rainy winters. Citrus fruits such as oranges, figs, olives, and grapes are commonly cultivated here.
  • Coniferous Forests: Also known as Taiga, these are found in the higher latitudes (50°–70°) of the Northern hemisphere. They are tall, soft-wood evergreen trees with conical shapes. Woods like pine, cedar, and fir are used for making pulp, paper, and matchboxes. Animals like silver fox, mink, and polar bear are common here.

2. Grasslands

Grasslands grow in regions of moderate to low rainfall. They are divided into:

  • Tropical Grasslands: These occur on either side of the equator and \textend up to the tropics. The grass can grow very tall, about 3 to 4 metres. Savannah grass of Africa is a prime example. Animals like elephants, zebras, giraffes, deer, and leopards are common.
  • Temperate Grasslands: Found in mid-latitudinal zones and in the interior parts of the continents. Usually, grass here is short and nutritious. Wild buffaloes, bison, and antelopes are common in these areas.

3. Thorny Bushes

These are found in dry desert-like regions. Tropical deserts are located on the western margins of the continents. Because of scanty rain and scorching heat, plants have deep roots, thorny leaves, and waxy surfaces to reduce loss of moisture through transpiration. Cacti, acacias, and thorny bushes are typical examples.

Wildlife Adaptations and Distribution

Just like plants, animals adapt to their environments. For instance, in tropical rainforests, you find colorful birds like toucans, hummingbirds, and mammals like monkeys and apes. In contrast, the tundra region houses animals with thick fur and skin to protect themselves from the freezing cold, such as the musk-ox, walrus, and polar bear.

Summary & Key Takeaways

Let us summarize the core learning points from this chapter:

  • Natural vegetation is classified mainly into forests, grasslands, and shrubs based on climate, temperature, and rainfall.
  • Tropical Evergreen Forests remain green year-round due to heavy rainfall, while Tropical Deciduous Forests shed leaves during dry seasons.
  • Coniferous (Taiga) forests contain soft-wood trees like pine and fir, dominating the higher northern latitudes.
  • Grasslands thrive in areas with moderate rainfall, categorized into tropical and temperate grasslands.
  • Flora and fauna adapt dynamically to their local climates, making conservation of these interconnected ecosystems vital for the survival of planet Earth.