Get, detailed solutions to the questions of the chapter Organism and Population from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme. Cbse.jagranjosh.com provided you NCERT solutions for classes 12th math and science subjects.
Some questions of this chapter are given here.
Q. How is diapause different from hibernation?
Answer. A stage of suspended development to cope with unfavorable conditions is termed as diapause. Various species of Zooplankton and insects show diapause to tide over adverse climatic conditions during their development period.
In hibernation or winter sleep is an animal escape winters (cold) by hiding themselves in their shelters? In this stage animal follows a state of inactivity by slowing their metabolism. The phenomenon of hibernation is exhibited by bats, squirrels, and other rodents.
Q. If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not?
Answer. Body of a marine fish is adapted to high salt concentrations of the marine environment so, if we place the marine fish in a fresh water aquarium, then its chances of survival will diminish. In fresh water conditions, they are unable to regulate the water entering their body (through osmosis). The hypotonic environment of marine environment is helpful in entering the water in their bodies. This results in the swelling up of the body, eventually leading to the death of the marine fish.
Q.Define phenotypic adaptation. Give one example.
Answer.Adaptation in the physical appearance to cope the genetic mutations or certain environmental changes is called as phenotypic adaptation. For example, desert plants have thick cuticles and sunken stomata on the surface of their leaves to prevent transpiration. Similarly, elephants have long ears that act as thermoregulators.