Animal Kingdom · Question 74

Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?

1. It is present only in larval tail in ascidian.
2. It is replaced by a vertebral column in adult frog.
3. It is absent throughout life in humans from the very beginning.
4. It is present throughout life in Amphioxus.

The figures (A – D) show four animals. Select the correct option with respect to a common characteristic of two of these animals. [Figure]

1. (A) and (B) have cnidoblasts for self-defence
2. (A) and (D) respire mainly through body wall
3. (C) and (D) have a true coelom
4. (B) and (C) show radial symmetry

What will you look for to identify the sex of the following?

1. Female Ascaris – sharply curved posterior end
2. Male frog – a copulatory pad on the first digit of the hind limb
3. Female cockroach – anal cerci
4. Male shark – claspers borne on pelvic fins

Which one of the following groups of animals is correctly matched with its characteristic feature without any exception?

1. Reptilia : possess 3-chambered heart with an incompletely divided ventricle
2. Chordata : possess a mouth with an upper and a lower jaw
3. Chondrichthyes : possess cartilaginous endoskeleton
4. Mammalia : give birth to young ones

In which one of the following the genus name, its two characters and its class/phylum are correctly matched?

1. array|l|l|l| Genus name & Two characters & Class/Phylum \ Ascaris & (i) Body segmented & Annelida \ & (ii) Males and females distinct & \ array
2. array|l|l|l| Genus name & Two characters & Class/Phylum \ Salamandra & (i) A tympanum represents ear & Amphibia \ & (ii) Fertilization is external & \ array
3. array|l|l|l| Genus name & Two characters & Class/Phylum \ Pteropus & (i) Skin possesses hair & Mammalia \ & (ii) Oviparous & \ array
4. array|l|l|l| Genus name & Two characters & Class/Phylum \ Aurelia & (i) Cnidoblasts & Coelenterata \ & (ii) Organ level of organization & \ array

Crocodile and penguin are similar to whale and dogfish in which one of the following features?

1. Possess a solid single stranded central nervous system
2. Lay eggs and guard them till they hatch
3. Possess bony skeleton
4. Have gill slits at some stage

One example of animals having a single opening to the outside that serves both as mouth as well as anus is

1. Octopus
2. Asterias
3. Ascidia
4. Fasciola

Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?

1. Penguin is homoiothermic while the remaining three are poikilothermic.
2. Leech is a fresh water form while all others are marine.
3. Spongilla has special collared cells called choanocytes, not found in the remaining three.
4. All are bilaterally symmetrical.

Which one of the following kinds of animals are triploblastic?

1. Flatworms
2. Sponges
3. Ctenophores
4. Corals

Which one of the following statements about certain given animals is correct?

1. Roundworms (Aschelminthes) are pseudocoelomates
2. Molluscs are acoelomates
3. Insects are pseudocoelomates
4. Flatworms (Platyhelminthes) are coelomates