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

Migration means moving from one place to another due to environmental or climatic conditions but it does not necessarily give a more stable life. Hence, it cannot be considered as adaption by plants or animals.

Roses have thorns which act as self-defense and warn animals that get too close to them. Trees have various features that serve as protection. Lemon tree has thorns to protect itself against hungry animals. Cactus have spines instead of leaves which help them defend against herbivores. Spines also help in preventing water loss.

Behavior refers to the actions or reactions of an organism, often in response to its environment. Option D describes a behavior because it involves movement (travelling) to find food, which is a response to a need. The other options describe characteristics or habitats, not actions.

Bears are able to survive during the winter months by hibernating. During hibernation, their metabolic rate slows down, allowing them to survive without eating for long periods. The other options (hunt, fish, aestivate) do not apply to bear behavior in winter.

Pond weed is an aquatic plant, meaning it grows in water bodies like ponds, lakes, and rivers. It thrives in the water and plays a role in maintaining the ecosystem by providing oxygen and serving as food for various aquatic animals. The other options do not apply to pond weed.

Pine trees have needle-like leaves (Option A), which help reduce water loss, and they also produce cones instead of flowers (Option C), which is an adaptation for reproduction in cold or hilly areas. These adaptations help pine trees survive in harsh environments. The other options are not relevant to the structural adaptations of pine trees.

The white coat of polar bears helps them to camouflage in their snowy and icy environment, making it easier for them to hunt and protect themselves from predators. This adaptation helps them blend into the snowy landscape, providing better chances of survival. The other options are not related to the purpose of their white fur.

Common cold is caused by a virus, specifically the rhinovirus. Viruses are responsible for a variety of respiratory infections, including the common cold. The other options (fungi, bacteria, protozoa) are not responsible for the common cold.

Plants of the grass family are also known as herbaceous plants because they typically have soft, non-woody stems. They do not form hard wood, making them different from trees or shrubs. The other options are not applicable to the grass family.

Fungi, including molds and yeasts, are the microbes that grow on rotten food, dead plants, or animals. They break down organic matter, contributing to decomposition. Bacteria can also contribute to decomposition, but fungi are more commonly visible as mold on decaying matter.