Sinking of zooplankton during the day and rising to the surface at night is an example of

(1) circinal rhythm               

(2) circadian rhythm

(3) tidal rhythm                   

(4) None of these

(1) A - II, B - I, C – III

(2) A - II, B - IV, C - III

(3) A - III, B - IV, C – I

(4) A - I, B - II, C - IV

Animals with a constant body temperature such as mammals and birds require more food than do animals with a changing body temperature such as reptiles and fish. Why?

(1) Much of the food is utilised to produce heat to keep warm

(2) Warm-blooded animals waste more food than cold-blooded animals

(3) Cold-blooded animals digest their food more efficiently than warm-blooded animals

(4) None of the above

I. Organisms living in oceans, lakes, and rivers face water-related problems.
II. Euryhaline can tolerate a wide range of salinities
III. Stenohaline are restricted to a narrow range of salinities
IV. No freshwater animals cannot live for long in seawater but sea animals can live in freshwater for a long time because of osmotic balance
V. The salt concentration (measured as salinity in parts per thousand), is less than 5 in inland water, 30-35 in the sea, and >100 in some hypersaline lagoons.
(1) All are correct                     

(2) All are false

(3) Only IV is wrong                 

(4) Only I, III, V are correct

Which of the following term implies the maintenance of relatively constant physical and chemical conditions with organisms?

(1) Homeostasis   

(2) Adaptation      

(3) Isometry         

(4) Acclimation

Human can get homeostasis through:

(1) Only physiological means

(2) Only physical means

(3) Both physiological and physical means

(4) Neither physiological nor physical means

Which of the following statement is false?
(1) Osmoconformors are able to maintain homeostasis by physiological means or sometimes behavioural means also which ensure constant body temperature, constant osmotic concentration etc

(2) All birds and mammals, and a very few lower vertebrates and invertebrates are capable of osmoregulation and thermoregulation

(3) Thermoregulation is the major reason of the success mammals

(4) Sweating and shivering are the means of thermoregulation by humans

I. Thermoregulation, osmoregulation and excretion are mechanisms that moderate change in the body.
II. 99% animals and almost all plants are conformers
III. Heat loss or heat gain is a function of surface area.
IV. Thermoregulation energetically least expensive process for many organisms like shrews and humming birds
V. 99% animals are thermoregulator
VI. Archaebacteria cannot tolerate high temperature
(1) I and II are wrong                 

(2) IV, V and VI are wrong

(3) None is wrong                       

(4) All are wrong

Why small animals are not found in polar area mostly?

(1) Because they have a smaller surface area relative to their volume

(2) Because they have a larger volume relative to their surface area

(3) Because they have a smaller metabolic rate

(4) Because they have a larger surface area relative to their volume

Kangaroo rats:

(1) Have a generalized diet               

(2) Avoid eating fats

(3) Do not need to drink water          

(4) Are insensitive to heat