Free Biodiversity and Variety of Life MCQs with Answers

1051. Which of the following class of mammals is believed to have strong resemblance with reptile?

• A. Meththeria
• B. Eutheria
• C. Prototheria
• D. Both eutheria and prototheria

Explanation: The class of mammals that is believed to have a strong resemblance to reptiles is "Prototheria." Prototheria includes the egg-laying mammals, such as monotremes (platypus and echidnas). These mammals have certain primitive features that resemble reptilian characteristics, such as laying eggs instead of giving birth to live young and having a cloaca (a single opening for excretion and reproduction) like reptiles. This distinguishes them from the other class of mammals.

1052. Which of the following is placental mammal?

• A. Kangroo
• B. Bat
• C. Duck bill platy pus
• D. Tasmanian wolf

Explanation: Only bats are placental mammals. Placental mammals give birth to live young that are nourished by a placenta, which is an organ that develops in the mother's uterus. The placenta provides the fetus with nutrients and oxygen, and it also removes waste products.

1053. Which of the following is ancient fossil fuel?

• A. Fish
• B. Reptile
• C. Bird
• D. Amphibian

Explanation: Fish are the only ancient fossil fuel that is still being used today. Coal, oil, and natural gas are all derived from the remains of ancient fish.

1054. Largest vertebrate is:

• A. Whale
• B. Elephant
• C. Giraffe
• D. Hippopotamus

Explanation: Except whales, all the mentioned animals are invertebrates.

1055. Which of the following are not amniotes?

• A. Mammals and birds
• B. Birds and reptiles
• C. Reptiles and amphibians
• D. Amphibians and fishes

Explanation: Amniotes are birds, reptiles, and mammals. They have characteristics of that of an amniotic egg.

1056. Cephalothorax is characteristic of:

• A. Arthropods
• B. Myriapods
• C. Gastropods
• D. None of these

Explanation: Cephalothorax is present in certain arthropods such as crustaceans and arachnids. Myriapods and Gastropods have a very different structure to arthropods.

1057. Gonads develop from embryonic:

• A. Ectoderm
• B. Endoderm
• C. Mesoderm
• D. All of these

Explanation: Gonads, which are the primary reproductive organs in humans and other animals, develop from the embryonic tissue known as the mesoderm. Let's go through each option and explain why: a. Ectoderm: The ectoderm is one of the three primary germ layers in the developing embryo. It gives rise to tissues such as the skin, nervous system, and sensory organs. While some structures related to reproduction, like the genitalia, may develop from the ectoderm indirectly, the gonads themselves do not originate from the ectoderm. b. Endoderm: The endoderm is another of the three primary germ layers. It gives rise to the lining of the digestive and respiratory tracts, as well as some internal organs like the liver and pancreas. It is not involved in the development of the gonads. c. Mesoderm: The mesoderm is the germ layer responsible for the development of various structures, including the gonads. In the embryo, the gonadal ridge forms from the mesoderm, which eventually differentiates into either testes (in males) or ovaries (in females). Summary: Gonads develop from the embryonic mesoderm. The other germ layers, ectoderm and endoderm, do not directly contribute to the formation of gonads. Therefore, the correct answer is option c, "Mesoderm."

1058. Penguins are usually present in _:

• A. Australia
• B. Antarctica
• C. Africa
• D. America

Explanation: Penguins are a group of aquatic, flightless birds living almost exclusively in Antarctica. All penguins are countershaded, i.e they have a white underside and a dark (mostly black) upperside. This is for camouflage.

1059. A body cavity is absent in:

• A. Acoelomates
• B. Pseudocoelomates
• C. Both Acoelomates and Pseudocoelomates
• D. Coelomates

Explanation: Acoelomates lack a body cavity, or coelom, between the body wall and the digestive system. This group includes the phylum Platyhelminthes, known as flatworms.

1060. Ascaris is which one of the following?

• A. Ectoparasite
• B. Respiratory tract parasite
• C. Intestinal parasite
• D. Urinogenital tract parasite

Explanation: Ascaris lumbricoides is an intestinal parasite of man.