Free Biodiversity and Variety of Life MCQs with Answers

2741. The respiratory pigment found in chordates is:

• A. Haemoglobin
• B. None
• C. Hemocyanin
• D. Hemolymph

Explanation: Haemoglobin is an oxygen carrying respiratory pigment found in chordates. It is found in the erythrocytes of these animals.

2742. Which of the following is an oviparous animal?

• A. Pidgeon
• B. Elephant
• C. Sheep
• D. Humans

Explanation: Option A is correct since oviparous animals are animals that produce young using eggs that are hatched after they have been laid by the parent. Option B is incorrect since the elephant is viviparous and produces young by giving birth to it after it has been developed in the body of the parent. Option C is incorrect since the sheep are also viviparous Option D is incorrect since humans are also viviparous.

2743. The shell of the egg is leathery in appearance in which of the following?:

• A. Amphibians
• B. Birds
• C. Mammals
• D. Reptiles

Explanation: Reptile eggs, including those of snakes and many turtles, are characterized by their leathery shells, which are flexible and often adhere to one another. This adaptation helps protect the eggs in a terrestrial environment. In contrast, amphibians lay eggs in water with jelly-like coverings, birds have hard shells made of calcium carbonate, and most mammals do not lay eggs at all, with the exception of monotremes like the platypus, which do have leathery eggs but are a rare subgroup. Thus, the correct answer is reptiles.

2744. Which of the following animals is NOT a protostome?

• A. Earthworm
• B. Cockroach
• C. Butterfly
• D. Sting ray

Explanation: Option D is correct since stingray is a deuterostome.Option A is incorrect since the earthworm is an annelid that belongs to the protostomia series.Option B is incorrect since the cockroach is an arthropod that belongs to the protostomia series

2745. The organs of locomotion in 'annelids' are which of the following?

• A. Muscles
• B. Hydrostatic skeleton
• C. Parapodia
• D. Setae
• E. A,C and D

Explanation: All annelids except leeches also have chitonous hair-like structures, called setae, projecting from their cuticle. Sometimes the setae are located on paddle-like appendages called parapodia. This helps in their locomotion. they also move with muscles too

2746. Which of the following exhibits both radial and bilateral symmetry?

• A. Mollusca
• B. Echinoderms
• C. Flatworms
• D. Sponges

Explanation: Echinoderms exhibit both radial and bilateral symmetry. During larval stages, echinoderms have bilateral symmetry whereas they have penta-radial or simply, radial symmetry during adult life. Molluscs and flatworms are phyla of bilateral symmetry. Sponges don't exhibit any symmetry; they are irregular/asymmetrical.

2747. What is correct about triploblastic animals?

• A. They show bilateral symmetry
• B. They show both radial and bilateral symmetry
• C. They are all protostomes
• D. They are all deuterostomes

Explanation: Triploblastic animals are characterized by having three primary germ layers: ectoderm, mesoderm, and endoderm. These animals predominantly exhibit bilateral symmetry, which is a common feature across this group. However, there are exceptions, such as adult echinoderms, which show radial symmetry. The statement that triploblastic animals are all protostomes or all deuterostomes is incorrect, as the group includes both types of developmental patterns. Therefore, none of the provided options fully capture the characteristics of all triploblastic animals.

2748. From the following statements select the wrong one:

• A. Prawn has one pairs of antennae
• B. Nematocysts are characteristics of the phylum cnidaria
• C. Millepedes have two pairs of appendages in each segment of the body
• D. Animals belonging to phylum porifera are marine and fresh water

Explanation: Prawns have two pairs of antennae, one on either side, just below the antennules. They are sensory, excretory, and balancing in function. Antennules are attached on either side, below the bases of the eye stalks. They are tactile in function. Nematocysts are present in cnidoblasts and act as organs of offence and defence. Millipedes belong to the class Myriapoda. They are called thousand-leggers because they possess numerous walking legs. Their body is made up of a small head and 40 trunk segments, each with two pairs of jointed legs. Animals belonging to the phylum Porifera are mostly marine, while a few are freshwater.

2749. The ostrich, penguin and kiwi are _ .

• A. Running birds
• B. Migratory birds
• C. Flightless birds
• D. Four-toed birds

Explanation: The ostrich, penguin, and kiwi are all flightless birds. This category best captures their shared trait of being unable to fly, though they have adapted to different environments: the ostrich to running on land, the penguin to swimming in water, and the kiwi to foraging on the ground. Other options are incorrect because they either apply to only one of the birds or are not characteristic of any of them.

2750. All are correct about acoelomates except:

• A. Sac type digestive system
• B. Well-developed respiratory system
• C. Parenchyma fills the body space
• D. Well-developed excretory system

Explanation: The correct answer is Option B: Well-developed respiratory system. Acoelomates, such as those in Phylum Platyhelminthes, lack a well-developed respiratory system and rely on diffusion through their body surface for gas exchange. Option A is incorrect because acoelomates have a sac-like digestive system. Option C is incorrect as the body cavity of acoelomates is filled with parenchyma. Option D is incorrect because their excretory system is simple, consisting of structures like protonephridia, rather than being well-developed.