Olympiad Test: Living Organisms & Surroundings - 3 - Class 6 MCQ

The figure represents the interdependence between plants and animals. Animals depend on plants for food and oxygen. Plants depend on animals for carbon dioxide.

Basic needs required for a plant to grow are air, water and sunlight. It prepares its food in the presence of sunlight. Its shoot system or stem respond to light and bends towards the direction of sunlight.

Cactus plants grow in deserts.

The white fur helps the polar bear to conserve heat and white surfaces are poor radiators of heat. Fat stored under its skin provides insulation against heat loss thus helping the animal to survive in the extreme cold conditions in the arctic region.

To protect themselves from extreme cold, some animals like penguins have thick skin and a thick layer of fat under their skin.

Terrestrial ecosystem includes those organisms which live on land. It is classified into three types ? Forest ecosystem. Grassland ecosystem and Desert ecosystem.

(iii) Plants lose a significant amount of water through transpiration, a process where water evaporates from the leaves.
(iv) Plants often have deep roots that aid in anchoring the plant and absorbing water and nutrients from deeper soil layers.

All these features - respiration (the process of exchanging gases), reproduction (producing offspring), adaptation (ability to adjust to the environment), and excretion (removal of metabolic waste) - are essential characteristics of living organisms.

Excretion involves the elimination of metabolic waste products from the body, not solely limited to excess water. It includes the removal of various waste substances, not just water, produced during metabolic processes.

Biotic components refer to living organisms in an ecosystem. In this set, aquatic plants, fish, frogs, and insects are all living organisms, representing the biotic components of a habitat.