Free Kingdom Animalia MCQs with Answers

241. The blood of arthropods is _ in color

• A. Green
• B. Brown
• C. Red
• D. Colorless

Explanation: A more correct term for the circulatory fluid in arthropods in haemolymph. In hexapods (insecta), it is whitish in color because respiratory pigments are absent. Some crustaceans have hemocyanin which gives their blood a blue (not green, red or brown) colored appearance.

242. The animal with exceptionally large brain is:

• A. Star fish
• B. Snail
• C. Octopus
• D. Sepia

Explanation: The largest invertebrate brain is the Octupus belonging to Class Cephalopoda of Phylum Mollusca.

243. These give rise to nematocysts in Cnidaria:

• A. Cnidocytes
• B. Gastrozooids
• C. Hydrozoids
• D. Mesoglea

Explanation: The explanation for this question will be added soon!

244. Typically spider's bloods blue due to the presence of which of the following.

• A. Hemoglobin
• B. Haemoerythrin
• C. Haemocyanin
• D. Both B and C

Explanation: The blue color of a spider's blood is typically due to the presence of haemocyanin (option c). Haemocyanin is a copper-based respiratory pigment found in the hemolymph (blood) of some invertebrates, including spiders. It turns blue when oxygenated and is responsible for transporting oxygen in their circulatory system.

245. 80% of the food of sponges consists of which of the following?

• A. Detrital organic particles
• B. Phytoplanktons
• C. Zooplankton and small animal
• D. All of these

Explanation: 80% of their food consists of detrital organic particles.

246. Exoskeleton of coelenterates is made up of which of the following material?

• A. Calcium carbonate
• B. Silica
• C. Chitin
• D. Lignin

Explanation: The exoskeleton of coelenterates, which includes corals and other related organisms, is primarily made up of calcium carbonate.

247. It is not a parasite:

• A. Annelida
• B. Nematoda
• C. Porifera
• D. Platyhelminthes

Explanation: Porifera does not contain any parasitic species.

248. Respiratory pigment present in Molluscs is:

• A. Hemoglobin
• B. Haemocyanin
• C. Myoglobin
• D. None of the above

Explanation: Option B is correct.The respiratory pigment present in Molluscs is hemocyanin. Haemocyanin is a copper-based respiratory pigment that is found in many invertebrates, including molluscs, arthropods, and some annelids. It is a blue-green color and is dissolved in the blood plasma. Haemocyanin is not as efficient as hemoglobin in transporting oxygen, but it is more efficient at transporting oxygen in cold water. This is because copper is a better conductor of heat than iron, so haemocyanin can help to prevent the body from losing heat.

249. Deuterostomes have:

• A. Spiral Cleavage
• B. Mouth develop form blastopore
• C. Mesoderm is formed form developing gut
• D. Schizocoelous

Explanation: Option C is correct.Deuterostomes have mesoderm formed from the developing gut. Deuterostomes are a group of animals that includes echinoderms, chordates, and hemichordates. They are characterized by the fact that their blastopore develops into the anus, while the mouth develops secondarily. In deuterostomes, the mesoderm is formed by a process called endocoely. Endocoely is a type of embryonic development in which the mesoderm forms from pouches that bud off from the developing gut. The mesoderm is a middle layer of tissue that forms between the ectoderm and endoderm. It gives rise to a variety of tissues and organs, including muscles, bones, blood, and the gonads.The formation of the mesoderm from the developing gut is a unique feature of deuterostomes. It is thought to be an adaptation that allows deuterostomes to grow and develop more complex bodies than their protostome counterparts.

250. Malpighian tubules are characteristic of:

• A. Mallard
• B. Leech
• C. Cockroach
• D. Star fish

Explanation: Option C is correct.Malpighian tubules are characteristic of cockroaches. Malpighian tubules are excretory organs that are found in insects and some other invertebrates. They are responsible for filtering waste products from the blood and transporting them to the rectum, where they are eliminated from the body. Malpighian tubules are long, thin, and coiled tubes that are located in the abdomen of insects. They are made up of a single layer of cells. Malpighian tubules filter waste products from the blood and transport them to the rectum. The waste products are then eliminated from the body in the form of feces. There are usually between six and eight Malpighian tubules in each insect. The number of Malpighian tubules can vary depending on the species of insect. Malpighian tubules are located in the abdomen of insects. They are attached to the gut by a short duct.