Free Biodiversity and Variety of Life MCQs with Answers

2891. The social organization of howling monkeys was studied by:

• A. Allen
• B. Thorpe
• C. Schjeldeup ebbe
• D. Carpenter

Explanation: The social organization of howling monkeys has been studied by several researchers. Among the options you provided, Allen, Thorpe, Schjelderup-Ebbe, and Carpenter, only one of them is directly associated with studying howling monkeys' social organization. The correct answer is Carpenter. Allen: It is unclear which specific Allen you are referring to, as there have been many researchers named Allen in various fields. Without further information, it is difficult to determine if any of them have specifically studied howling monkeys' social organization. Thorpe: Again, without more context, it is challenging to identify which Thorpe you are referring to. There have been multiple researchers with the last name Thorpe. However, it is worth mentioning that the name Thorpe is not commonly associated with studies on howling monkeys' social organization. Schjelderup-Ebbe: Konrad Lorenz is well-known for his work on ethology and animal behavior, including his studies on the pecking order in chickens, which introduced the concept of "dominance hierarchy" and "pecking order." However, Schjelderup-Ebbe is not typically associated with howling monkeys' social organization research. It's possible there may be some connection or reference I am not aware of, but it is not a commonly recognized association. Carpenter: Robert Carpenter is a primatologist known for his extensive research on howling monkeys' social organization. His work has focused on studying the behavior, ecology, and social dynamics of howling monkeys in their natural habitats. Carpenter's research has contributed significantly to our understanding of howling monkey social systems, including their vocalizations, group composition, and mating strategies. In conclusion, among the options provided, Carpenter is the researcher most closely associated with studying the social organization of howling monkeys.

2892. Diseases in living organisms which are caused by parasites are called:

• A. Disinfestations
• B. Antisepsis
• C. Infections
• D. Infestations

Explanation: FACT Diseases in living organisms that are caused by parasites are called infestations.

2893. This group of animals have three bones in the ear.

• A. Reptiles
• B. Mammals
• C. Both reptiles and mammals
• D. Birds and mammals

Explanation: Option A: Reptiles generally do not have three bones in the ear. Instead, reptiles typically have a single bone in their middle ear called the stapes or columella. This bone is responsible for transmitting sound vibrations from the eardrum to the inner ear.Option B: Mammals have three bones in the ear. These three bones, known as the ossicles, are located in the middle ear. They are named the malleus (hammer), incus (anvil), and stapes (stirrup). The ossicles transmit sound vibrations from the eardrum to the inner ear, amplifying and transmitting sound waves for auditory perception.Option C: Both reptiles and mammals: This option is incorrect. Reptiles typically have a single bone (stapes or columella) in the middle ear, while mammals have the three ossicles (malleus, incus, and stapes).Option D: Birds and mammals: This option is correct. Both birds and mammals have three bones in the ear. In birds, the three bones are called the columella, incus, and stapes. These bones play a similar role to the mammalian ossicles, transmitting sound vibrations from the eardrum to the inner ear for auditory processing.

2894. What is the size range of porifera?

• A. Few centimeter wide to more than one meter tall.
• B. Few decimeter wide to more than one meter tall.
• C. One meter wide to more than millimeter tall.
• D. Few millimeter wide to more than one meter tall.

Explanation: Most Porifera are only a few centimeters in size, but some urn-shaped or shapeless ones are less than a centimeter (0.4 inches); others, shaped like vases, tubes, or branches, maybe one to two meters (3.3-6.6 feet) tall, and broad rounded masses may be one to two meters in diameter.

2895. The nervous system of Arthropoda resembles which of the following phylums?

• A. Annelida
• B. Mollusca
• C. Plathyelminthes
• D. Coelenterata

Explanation: The' arthropod nervous system' consists of a dorsal brain and a ventral, ganglionated longitudinal nerve cord (primitively paired) from which lateral nerves extend in each segment. The system is similar to that of 'annelid worms', from which arthropods may have evolved.

2896. Lack of symmtery is identified in which group of animals?

• A. Porifera
• B. Parazoa
• C. Coelomates
• D. Protozoa

Explanation: Parazoa refers to the class of organisms in the kingdom Animalia which lacks tissue grade of organization. Only Porifera (sponges) are included in this phylum.

2897. This group of animals has three bones in the ear:

• A. Reptiles
• B. Mammals
• C. Both reptiles and mammals
• D. Birds and mammals

Explanation: Modern mammals are unique among vertebrates for possessing three tiny bones in the middle ear. The malleus, incus, and stapes (commonly known as the hammer, anvil, and stirrup) work as part of a chain that transmits sound toward the skull. Birds and reptiles have only one bone to perform this function.

2898. Which one of the following is not a feature of the nervous system of Planaria?

• A. Nuerons are differentiated into sensory, motor and associative neurons.
• B. Nerves are present.
• C. No specialized sensory organs are present.
• D. All of the above.

Explanation: 1. Planaria is a flatworm and belongs to the phylum Platyhelminthes. 2. It is the most primitive animal with a Central Nervous System (CNS) located on the ventral side of the body. 3. Nervous system consists of a mass of cerebral or cephalic ganglion appearing like an inverted U-shaped brain. 4. Ventrally from below the ganglia arise a pair of Ventral Nerve Cords (VNC) or long nerve cords. These are interconnected to each other by transferring nerve or commissure in a ladder-like manner. 5. The PNS include sensory cells arranged in lateral cords in the body.Therefore, option C is not correct.

2899. Which is not the characteristic of triploblastic?

• A. They may be coelomate pseudocoelomate or acoelomate
• B. They are included in grade bilateria
• C. All of them have a digestive system
• D. All of them have blood vascular system

Explanation: Correct option is D. Option D is not a feature of triploblastic animals.

2900. Ustilago maydis is the scientific name of a?

• A. Fungus
• B. Smut
• C. Bacterium
• D. Yeast

Explanation: Corn smut is a plant disease caused by the pathogenic fungus Ustilago maydis. Hence option B here is the accurate one because Ustilago maydis is the scientific name of smut that belongs to the kingdom fungi.