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Organisms and Populations Test - 73

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Organisms and Populations Test - 73
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  • Question 1
    1 / -0
    In doing a 'round dance,' a returning honeybee forager communicates what information about a food source to waiting potential foragers? 
    Solution
    Round dance is a term used in bee keeping. It refers to the communication of social insects. It describes a specific communicative behaviour of honey bees inside the bee hive. When a forager, or scout bee, returns to the hive, she performs a round dance to communicate the location of food sources close to the colony (less than 35 yards away). The bee moves in a circular pattern. 
    Therefore, the correct answer is option B.
  • Question 2
    1 / -0
    All close relationships between organisms are referred to as
    Solution
    Symbiosis describes close interactions between two or more different species. It is different from regular interactions between species because, in a symbiotic relationship, the two species in the relationship live together. Many organisms are involved in symbiotic relationships because this interaction provides benefits to both species. However, there are types of symbiosis that are not beneficial and may, in fact, harm one or both of the species.
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    Law of tolerance was formulated by
    Solution
    Shelford's Law: A law stating that the abundance or distribution of an organism can be controlled by certain factors (e.g. the climatic, topographic, and biological requirements of plants and animals) where levels of these exceed the maximum or minimum limits of tolerance of that organism.

  • Question 4
    1 / -0
    According to the latest census the most densely populated country in world is
    Solution
    In 2013 the population of Bangladesh was estimated at 160 million. About 89% of Bangladeshis are Muslims, followed by Hindus (8%), Buddhists (1%) and Christians (0.5%). Bangladesh has the highest population density in the world, excluding a handful of city-states and small countries with populations under 10m, such as Malta and Hong Kong.
    So, the correct answer is option D.
  • Question 5
    1 / -0
    The biologist who discovered the meaning of the dances performed by returning honeybee foragers was 
    Solution
    Karl von Frisch is best known for two major discoveries about honey bees. First, he demonstrated that honey bees have color vision, and published these findings. He showed that honey bees use a dance language to communicate food locations to other bees. Frisch observed that once one honey bee finds a feeding station, many other soon appear at the same station. This suggests that the first bee recruits other bees to the food. von Frisch's discovery of the dance language of the honey bee required careful determination of the correlations between movements of bees inside the hive and the locations of feeding stations. He found two types of dance. His work centered on investigations of the sensory perceptions of the honey bee and he was one of the first to translate the meaning of the waggle dance. 
  • Question 6
    1 / -0
    Which one of the following developing country shows highest death rate due to the natural calamities?
    Solution
    A natural disaster is a sudden change in the environment which is different from the normal one. It causes lots of collateral damage or loss of life, brought about by forces other than the acts of human beings. Earthquakes, flooding, volcanic eruption, landslide, hurricanes etc. are considered as a natural disaster.
    Bangladesh has the highest population density in the world, excluding a handful of city-states and small countries with populations under 10m, such as Malta and Hong Kong. Asian and Pacific countries continue to suffer disproportionately from disasters caused by natural hazards. Disasters cause death, economic and environmental damage, and severe setbacks for social development. Recent large-scale disasters, including the devastating earthquake and tsunami in Japan of March 2011, highlight the value of national preparedness for disaster. The Asian and Pacific region is vulnerable to many types of disasters, including floods, cyclones, earthquakes, drought, storm surges and tsunamis. During the past decade, on average, more than 200 million people were affected and more than 70,000 people were killed by natural disasters annually.
    So, the correct answer is option B.

  • Question 7
    1 / -0
    The association between ants and petiole of certain plants is called as
    Solution
    Myrmecophily is the term applied to interspecies associations between ants and other organisms such as plants, other arthropods, and fungi. It refers to mutualistic interaction with ants. 
    So, the correct answer is option D.
  • Question 8
    1 / -0
    The relationship between Mixotricha paradoxa and Australian termites is of
    Solution
    Mutualism is the symbiotic association of living organism. Mixotricha paradoxa is a species of protozoan that lives inside the gut of the Australian termite species. Mixotricha forms mutualistic relationships with bacteria living inside the termite. It lives in the gut of termites and helps them digest cellulose, a major component of the wood they eat and in turn, gets prepared food from them.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    In a population, the condition at which the rate of addition of new members is more than the rate of individuals lost, indicates
    Solution
    • The exponential phase is characterized by the vigorous growth of the bacteria where it is in the constant state of division. They undergo the DNA replication and synthesis of new proteins which increases their metabolic rate.
    • As the bacterial population continues to grow, all the nutrients in the growth medium are used up by the microorganism for their multiplication. 
    • This results in the accumulation of waste materials, toxic metabolites, and inhibitory compounds such as antibiotics in the medium. 
    • The reproduction rate will slow down, the cells undergoing division is equal to the number of cell death, and finally, bacteria stops its division completely. 

    So, the correct answer is option B.
  • Question 10
    1 / -0
    Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.
    Solution
    Fangs are sharp, long, hollow or grooved teeth that are connected to a small sac in the snakes head behind its eyes. These sacs produce a poisonous liquid called venom. When a snake bites, venom is released and starts to work immediately to kill or paralyze the prey. Snakes use poison to kill prey, not for escape. 
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