Science - Living Things

Explanation
A worm is an example of an invertebrate because it lacks a backbone or vertebral column. Invertebrates are animals that do not possess a spinal column and make up the majority of animal species on Earth. They can be found in various habitats, including soil, water, and even inside other organisms. Worms, such as earthworms and roundworms, belong to the phylum Annelida and Nematoda respectively, and both are classified as invertebrates.

Explanation
Yeast is a type of fungus. It is a single-celled organism that belongs to the fungus kingdom. Yeast is commonly used in baking and brewing processes due to its ability to ferment sugars. It plays a crucial role in the production of bread, beer, and wine. Unlike sponges, algae, and mitochondria, which are not classified as fungi, yeast exhibits characteristics such as the absence of chlorophyll and the ability to reproduce through budding.

Explanation
Plants need chlorophyll to make food through the process of photosynthesis. Chlorophyll is a green pigment found in the chloroplasts of plant cells. It absorbs sunlight and uses its energy to convert carbon dioxide and water into glucose and oxygen. This glucose is then used as a source of energy for the plant. Without chlorophyll, plants would not be able to produce their own food and survive.

Explanation
An example of a cone bearing plant is the pine. Pine trees are known for their cone-shaped structures that contain seeds. These cones are a distinctive feature of pine trees and are used for reproduction. The pine cones protect the seeds and release them when they are mature. This allows the pine tree to spread its seeds and reproduce effectively. Therefore, pine is a correct answer as it is a cone bearing plant.

Explanation
The nucleus is considered the "brain" of plant and animal cells because it contains the cell's genetic material, DNA, which controls the cell's activities and functions. It regulates the synthesis of proteins and enzymes, which are essential for the cell's growth, development, and reproduction. The nucleus also plays a crucial role in cell division and the transmission of genetic information to the next generation.

Explanation
Ants, crabs, and spiders are classified as arthropods. Arthropods are a group of invertebrate animals that have jointed limbs, a segmented body, and an exoskeleton. They are the largest phylum in the animal kingdom and include insects, crustaceans, and arachnids. Ants, crabs, and spiders all possess these characteristics, making them arthropods.

Explanation
A snail is not a vertebrate because it belongs to the phylum Mollusca, which includes animals without a backbone. Vertebrates, on the other hand, have a well-developed internal skeleton made of bones or cartilage. Snakes, birds, and fish are all vertebrates as they possess a backbone.

Explanation
Fruit-bearing plants produce seeds in their flowers. Flowers contain the reproductive organs of the plant, including the pistil (female reproductive organ) and stamen (male reproductive organ). The pistil contains the ovary, which houses the ovules that develop into seeds after fertilization. Therefore, the correct answer is flowers.

Explanation
Scientists use microscopes to observe microorganisms because microorganisms are too small to be seen with the naked eye. Microscopes have high magnification capabilities, allowing scientists to see the intricate details and structures of microorganisms. This tool helps scientists study and understand the behavior, characteristics, and interactions of microorganisms, which are essential for various fields such as microbiology, medicine, and environmental science.

Explanation
Mold is the correct answer because it is a type of cottony fungus that commonly grows on bread. Mold consists of hyphae, which are thread-like structures that make up the body of the fungus. The cytoplasm is the gel-like substance found within the cells of the mold. Therefore, mold is the most appropriate choice for the given question.