Biology Questions and Answers

Arthropods are characterized by the presence of a segmented body. This is a key characteristic of the phylum Arthropoda, which includes insects, spiders, and crustaceans. The other options are incorrect. Arthropods do not exhibit radial symmetry, they have an open circulatory system, and their exoskeleton is made of chitin, not bones.

The alimentary canal, also known as the gastrointestinal tract, is a long, continuous tube that extends from the mouth to the anus. It is responsible for the digestion and absorption of nutrients.
Oesophagus: The esophagus is a muscular tube that connects the mouth to the stomach.
Pancreas: The pancreas is both an endocrine and exocrine gland. From the digestive system perspective, it plays an important role in producing and secreting digestive enzymes into the small intestine.
Small intestine: The small intestine is the longest part of the alimentary canal and is divided into three sections: duodenum, jejunum, and ileum.

In genetics, an allele is one of two or more versions of a gene that are found at the same place on a chromosome. Alleles can come in different versions, with each version bringing about different phenotypic traits. For example, a gene for flower color may have one allele that produces red flowers and another allele that produces white flowers. Therefore, the alternate form of a gene is an allele.

The primary products of photosynthesis are glucose and oxygen. During photosynthesis, plants use sunlight, water, and carbon dioxide to produce glucose, a simple sugar that serves as the main source of energy for the plant. Oxygen is also produced as a byproduct of photosynthesis and is released into the atmosphere.

Red blood cells, also known as erythrocytes, are responsible for carrying oxygen to the body tissues. They contain a protein called hemoglobin, which binds to oxygen in the lungs and transports it to other parts of the body.