Most Repeated MDCAT Biology: Kingdom Animalia MCQs

Explanation

Anamniotes are animals that do not have an amnion, a membrane that surrounds the embryo during development. Anamniotes are typically found in aquatic environments and lay eggs with a soft, permeable shell.Characteristics of anamniotes- Lay eggs with a soft, permeable shell- Do not have an amnion- Typically found in aquatic environments- Include fish, amphibians, and some invertebratesAll other animals have hard shells and are egg-laying animals, called as amniotes.

Explanation

Explanation:The coelom cavity is present between the body wall and the alimentary canal and is lined by Mesoderm.OPTION B: The epidermis is the outermost layer of skin in vertebrates, and it is derived from the mesoderm, not the ectoderm.This option is also incorrect because the coelom is a cavity lined by Mesoderm, not endoderm.This option is also incorrect because the ectoderm is the outermost germ layer, and it gives rise to the epidermis, nervous system, and other tissues in the body.

Explanation

Ancylostoma duodenale is a species of the roundworm genus Ancylostoma. It is a parasitic nematode worm and commonly known as the Old World hookworm.

Explanation

Annelida: This phylum includes segmented animals like; earthworms, leech, etc Their body is soft and bilaterally symmetrical Their body is divided into the ring like grove(segments) called annuli. They have a complete digestive system from the mouth to anus Excretion is by nephridia. They have a closed circulatory system. Sexes may be separate or united (sexual reproduction ). The true body cavity is present. Eg; Pheretima, leech.

Explanation

Among the options provided, the animal that possesses an open circulatory system is the Grasshopper. An open circulatory system is a type of circulatory system where the circulating fluid, called hemolymph, is not confined to blood vessels but instead bathes the tissues directly. In this system, the hemolymph is pumped by a simple heart into the body cavity, where it comes into direct contact with the organs and tissues. The fluid then returns to the heart, and the cycle repeats. Now, let's go through the options: Amoeba: Amoebas are unicellular organisms and do not possess a circulatory system. Earthworm: Earthworms have a closed circulatory system.

Explanation

In Coelenterates (also known as Cnidarians), such as jellyfish, corals, and sea anemones, the endoderm (also known as the gastrodermis) is the innermost layer of cells that lines the digestive cavity.

Explanation

All are the characteristics of the phylum Arthropoda except option B. A water vascular system is a characteristic of the phylum Echinodermata, the "spinny-skinned" animals such as sea stars and sea urchins. Their water vascular system ends in tube feet that play a role in locomotion.

Explanation

The duck-billed platypus and the spiny anteater, also known as the echidna, are unique among mammals because they are oviparous. Unlike most mammals that are viviparous, meaning they give birth to live young, these two species lay eggs. After internal fertilization, the eggs are laid by the mother and hatch outside her body. This differentiates them from ovoviviparous animals, which retain the eggs inside their body until they hatch, and viviparous animals, which do not lay eggs at all. Therefore, the correct option is 'Oviparous'.

Explanation

Nematocysts are specialized stinging cells unique to the phylum Cnidaria, which includes jellyfish, corals, and sea anemones. These cells contain venomous coiled threads that can be deployed for protection or capturing prey. Porifera, Protozoa, Annelida, and Echinodermata do not possess these specialized structures, distinguishing Cnidarians as the correct group.