VERTEBRATES AND INVERTEBRATES (Part-I)

21. Which among the following birds impersonates the calls of other birds to steal food? [S.S.C. Online CPO S.I. (T-I) 23.11.2020 (Shift-I)]

(a) Drongo
(b) Eagle
(c) Owl
(d) Mynah

Correct Answer: (a) Drongo

Solution:Drongos frequently attack much larger birds (e.g., hawks and crows) that might hurt their eggs or young; innocuous birds nest near drongos to gain protection. Most drongos are 18 to 63.5 cm (7 to 25 inches) long with glossy black. Drongos range from Africa to Central Asia, Australia, and western Pacific islands, inhabiting forests, open country, and gardens.

22. Red worms have a structure named _____ which helps them in grinding their food. [S.S.C. Online Graduate Level (T-I) 3.03.2020 (Shift-I)]

(a) Gizzard
(b) Intestine
(c) Crop
(d) Esophagus

Correct Answer: (a) Gizzard

Solution:Red worms (and earthworms in general) lack teeth. Their digestive system includes a muscular organ called the gizzard. The gizzard uses grit and small stones ingested by the worm to grind down food particles before they enter the intestine for digestion and absorption.

23. Which of the following eye disorders is known as 'lazy eye'? [S.S.C. Online CHSL (T-I) 13.01.2020 (Shift-I)]

(a) Myopia
(b) Presbyopia
(c) Amblyopia
(d) Hypermetropia

Correct Answer: (c) Amblyopia

Solution:Amblyopia is a condition where one eye develops poorer vision because the eye and brain aren't working well together. The brain effectively "turns off" or ignores the images from the weaker eye, leading to reduced vision that isn't correctable by glasses or contact lenses alone. It typically develops in childhood.

24. Jellyfish are an example of which type of phylum? [S.S.C. Online Graduate Level (T-I) 4.03.2020 (Shift-II)]

(a) Phylum - Porifera
(b) Phylum - Ctenophora
(c) Phylum - Cnidaria
(d) Phylum - Protozoa

Correct Answer: (c) Phylum - Cnidaria

Solution:Jellyfish belong to the phylum Cnidaria. This phylum is characterized by radial symmetry, the presence of stinging cells called nematocysts (used for defense and capturing prey), and typically two body forms: the polyp (sessile) and the medusa (free-swimming, like a jellyfish).

25. Crabs belong to the phylum ____ . [S.S.C. Online CHSL (T-I) 11.01.2017 (Shift-III)]

(a) Mollusca
(b) Cnidaria
(c) Arthropoda
(d) Platyhelminthes

Correct Answer: (c) Arthropoda

Solution:Crabs, lobsters, shrimp, barnacles and many other animals belong to the phylum arthropods. In fact, 75% of all animals belong to the phylum Arthropoda (which also includes spiders and insects). All arthropods have a hard exoskeleton made of chiton, a type of protein.

26. Adamsia (sea anemone) and pennatula (sea-pen) are examples of which phylum? [S.S.C. Online Graduate Level (T-I) 22.08.2017 (Shift-I)]

(a) Cilantarta
(b) Annelida
(c) Ascleminthes
(d) Arthropoda

Correct Answer: (a) Cilantarta

Solution:Adamsia (sea anemone) and Pennatula (sea-pen) are both examples of organisms belonging to the phylum Cnidaria. The option "Cilantarta" appears to be a misspelling of "Coelenterata," which is an older name for the phylum Cnidaria. Both sea anemones and sea-pens exhibit the characteristic cnidarian features like radial symmetry and stinging cells.

27. Which aquatic animal has trailing tentacles? [S.S.C. Online CHSL (T-I) 31.01.2017 (Shift-II)]

(a) Sea horse
(b) Coral
(c) Jelly fish
(d) Starfish

Correct Answer: (c) Jelly fish

Solution:Jellyfish are well-known for their bell-shaped bodies and the long, trailing tentacles that hang below them. These tentacles are armed with stinging cells (nematocysts) used to capture prey and for defense.

28. Identify an example of diploblastic animals. [S.S.C. Online CGL (T-I) 05.12.2022 (Shift-IV)]

(a) Platyhelminthes
(b) Arachnids
(c) Chordates
(d) Coelenterates

Correct Answer: (d) Coelenterates

Solution:Diploblastic animals are those whose embryos have two primary germ layers: the ectoderm (outer layer) and the endoderm (inner layer). They lack a mesoderm, the third germ layer found in triploblastic animals.