Test: Characteristics of Living Beings - Class 6 MCQ

Presence of specific features or certain habits, which enable an organism to live naturally in a place is called adaptation. Adaptation of organisms differ depending on their place of dwelling. That is why a fish cannot live out of water and camel cannot live in sea. 

Aquatic animals use gills for respiration. The gills absorb oxygen from the air dissolved in water.

• Phototropism is the growth or movement of a plant towards or away from light. In this case, the bending of a stem towards sunlight is an example of positive phototropism, where the plant grows toward the light source to maximize photosynthesis.

Other options:

• Geotropism (Option A) is the response of a plant to gravity, like roots growing downward.
• Hydrotropism (Option C) is the response of plant roots to water.
• Nasticism (Option D) refers to plant movements that are non-directional, such as the closing of flowers at night or the opening and closing of leaves in response to changes in light or temperature.

So, the bending of the stem towards sunlight is an example of phototropism.

Decomposition is a process that occurs after the death of an organism and is not a characteristic of living things. Living things exhibit characteristics such as growth, respiration, and reproduction, which are absent in non-living entities.

The correct answer is C) Slippery scales.

• Fish have slippery scales on their bodies, which help them move smoothly through the water.
• The scales protect the fish and reduce friction, allowing them to swim easily.

Other options like large wings, strong legs, and long neck are not features found in fish that help them swim in water.

Submerged Aquatic Plants:

• Hydrilla: Hydrilla is a submerged aquatic plant that grows completely underwater. It is a highly invasive species that can form dense mats in bodies of water, impacting native plant and animal species.
• Water hyacinth, water lily, and lotus are all aquatic plants, but they typically grow partially or completely above the water's surface.

By understanding the characteristics of different aquatic plants, we can identify which ones grow submerged and which ones grow above the water's surface. In this case, Hydrilla is the correct answer as it is a submerged aquatic plant.

Primary function of scales on fishes is to protect themselves from predators and also help in easy movement through water.

Correct Answer- Option A

• Yaks have thick hair on their bodies, which helps keep them warm in cold environments.
• The other options (feathers, scales, and shells) are not found on yaks and do not help them stay warm.

Non-Living Thing Among the Following:

• A: log piece - Logs are cut pieces of wood that have been separated from the tree. They are no longer living and do not have the ability to grow or reproduce. Therefore, log piece is the non-living thing among the options given.
• B: tree - Trees are living organisms that grow, reproduce, and require sunlight, water, and nutrients to survive.
• C: grasshopper - Grasshoppers are living creatures that belong to the animal kingdom and have the ability to move, eat, and reproduce.
• D: dog - Dogs are living animals that breathe, eat, move, and reproduce. They are part of the animal kingdom and are considered living organisms.

The leaves of mimosa commonly known as touch- me-not plant fold up quickly when touched with a hand. This is an example of response of plants towards changes in their surroundings.