Olympiad Test Level 1: Plants and Animals - 2 - Class 4 MCQ

Entomology is the scientific study of insects. Pathology is the study of diseases. Virology is the study of virus and viruslike agents. Microbiology is the study of microorganisms.

Cacti have thick and fleshy stems that are specially adapted to store water. This adaptation helps them survive in desert environments where water is scarce. The stored water allows cacti to withstand long periods of drought.

Plants generally store food in the form of starch in their roots, leaves, seeds, or other parts, but not typically in the stem like cacti. In cacti, the stem's primary role is to store water rather than food.

Giraffes have long necks that allow them to reach and eat acacia leaves from tall trees. Their long necks help them access food that other animals can't reach.

Sharks are great swimmers because of their fins, which help them to move efficiently through the water. The fins provide stability, control, and propulsion, making them fast and agile swimmers.

Fish breathe in water using gills, which extract oxygen from the water as it flows over them. Gills are specialized organs that allow fish to absorb oxygen and release carbon dioxide.

• Terrestrial animals, like mammals, birds, and reptiles, primarily breathe through lungs, which are specialized organs for gas exchange.
• Lungs allow these animals to take in oxygen from the air and expel carbon dioxide, a waste product of metabolism.
• This process occurs through inhalation and exhalation, enabling efficient breathing even when they are on land.
• Other structures, like gills or scales, are not used for breathing in terrestrial environments.

Teak trees grow mainly in plain areas, particularly in tropical regions. They are known for their strong, durable wood, and are commonly found in India, Southeast Asia, and parts of Africa.

Palms and tamarind trees typically grow in hot and damp areas. They thrive in warm climates with moderate moisture, such as tropical and subtropical regions.

Mangrove trees grow in marshy or coastal areas where the soil is waterlogged. These trees are adapted to survive in saline water and help protect coastal ecosystems.

• Plants must adjust to survive extreme weather and other challenging conditions.
• For Example, roses have thorns to protect themselves from animals that may try to eat them, which is an example of adaptation.

Tall, straight, and needle-like leaves are characteristics of plants that grow in mountainous regions, particularly coniferous trees like pines, which are adapted to survive in cold and windy climates.

Pine, fir, deodar, and spruce are all examples of conifers, which are trees that have needle-like leaves and reproduce through cones. These trees are typically found in cooler climates and are known for their ability to survive harsh environmental conditions.

Mammals have hair or fur, amphibians can live on both land and water, birds have feathers and fish respire through gills.

Water hyacinth is a floating plant. It floats on the surface of water because its roots hang down into the water while its leaves and flowers stay above the water surface. This plant is commonly found in ponds, lakes, and other bodies of water.

A terrestrial plant is a plant that grows on land, as opposed to aquatic plants that grow in water. These plants are adapted to live in soil and require access to air and sunlight for photosynthesis.