FREE NEET Biology Practice MCQ Test: Animal Kingdom Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (c)

Sycon, belonging to the Phylum Porifera, are multicellular organisms with cellular level of body organisation. The constituent cells perform their functions more or less independently. No distinct tissue or organs are present in it.

Answer: (c)

Answer: (c)

Answer: (a)

Answer: (d)

Answer: (b)

Answer: (d)

Fasciola, a flatworm has a single body cavity to the outside that serves both as mouth for ingestion and anus for egestion of undigested food. This is known as blind sac plan.

Answer: (a)

All the figures (A, B, and C) are the examples of porifera phylum. A, B and C are respectively Sycon, Euspongia (also called horny sponge) and Spongilla. They are primitive, sessile, aquatic, water dwelling filter feeders that pump water through their bodies to filter out particles of food matter.

Answer: (c)

Spongilla is a fresh water sponge that belongs to phylum porifera. It has special collared cells called choanocytes. Choanocytes are not found in leech, dolphin and penguin.

Answer: (c)

Answer: (a)

Answer: (c)

Answer: (a)

The organism attached to the substratum possess radial symmetry in all vertical planes. All the animals belonging to cnidaria (e.g., jellyfish) and echinodermata (e.g., starfish) are radially symmetrical, and typically sessile in their adult form. In radial symmetry, the parts in an organ or organism when cut through the centre in any direction produces two halves that are mirror images of each other.

Answer: (a)

Silverfish, scorpion, dragonfly and prawn belong to phylum arthropoda. Their body is covered by chitinous exoskeleton and have jointed appendages.

Answer: (a)

Answer: (d)

Answer: (d)

Phylum Arthropoda is the largest phylum of Animalia which includes insects. Examples include Apis, silkworm, Laccifer, silverfish (Lepisma), locust, etc. Pufferfish and flying fish (Exocoetus) are examples of Superclass Pisces, while cuttlefish (Sepia) belongs to Phylum Mollusca.

Answer: (d)

Homoiothermy is the maintenance by an animal of its internal body temperature at a relatively constant value by using metabolic processes to counteract fluctuations in the temperature of the environment. Homoiothermy occurs in birds and mammals, which are described as endotherms. The heat produced by their tissue metabolism and the heat lost to the environment are balanced by various means to keep body temperature constant: 3638°C in mammals and 3840°C in birds. The hypothalamus in the brain monitors blood temperature and controls thermoregulation by both nervous and hormonal means. Thus parrot (bird) and platypus and kangaroo (mammals) are homoiothermic animals.

Answer: (a)

Answer: (d)

Phylum Porifera (the sponges) has cellular level of body organisation, with inner cellular layer consisting of highly specialised flagellated cells called choanocytes (or collar cells). The development in this phylum is indirect as it includes a free swimming larva called amphiblastula or parenchymula for dispersal of the species.