Tag: oviparous and viviparous

The nervous system undergoes least changes during metamorphosis of frog's tadpole. Frog's nervous system once differentiated remains as such throughout life. However, the brain acquires its normal shape and size. 

In each stage of complete metamorphosis, the animal looks different than at all other stages. This is different from incomplete metamorphosis where the early stages of development look like tiny versions of the adult. Butterflies are an example of an insect that goes through all the stages of complete metamorphosis.

If the sperm and egg cells of a butterfly have six chromosomes, 12 chromosomes will be there in the maggot larvae. This is because maggot larvae forms due to the fusion of egg and sperm cells. Since egg contains 6 and sperm cells contains 6 chromosomes, maggot larvae will get both sperm cell and egg cell chromosomes. Thus, the correct answer is option C.

• Parthenogenesis is a form of asexual reproduction in which organisms reproduce without fertilization. It is seen to occur naturally in bees.
•  Drone bees are produced parthenogenetically. Female worker honey bees lay only unfertilized eggs and these eggs result in drone bees. 
• So, the correct option is 'Honeybee'.

Xenopus laevis tadpoles that arrest development and remain as larvae for several years sometimes occur spontaneously in laboratory populations. These tadpoles cease development at an early hindlimb stage, but continue to grow and develop into grossly deformed giants. Giant tadpoles lack thyroid glands, and differ in morphology and behaviour from normal larvae. Tadpoles of frog can be made to grow as giant sized tadpoles, if they are administered large amounts of thryoxine.

• Metamorphosis refers to the way that organisms develop, grow, and change form.
  
• Metamorphosis majorly occurs in insects.
• metamorphosis has four stages i.e egg, larva, pupa and adult.
• Caterpillars, maggots and grubs are all just the larval stages of insects.
• The hormone released during the development of a caterpillar to moth(adult insect) is called juvenile hormone(JH).
  

• Typically, insects including butterflies have 4 stages in their life cycle.
• The first stage is egg. when the eggs hatch the new insect is called a larva (second stage).
• The third stage i.e. pupa represents the transition between larva and adult ( fourth stage).

The larva is that stage in metamorphosis following which the adult stage is reached. The larvae consume a lot of food in order to fuel their transition into the adult form. Hence, during the larva stage the creature eats a lot of food which acts as the source of nutrition and energy, required for its transformation into an adult.

• Amphibian metamorphosis depends upon the amount of iodine secured by larvae; the greater the quantity the more rapid the differentiation.
  
• Also, thyroxine initiates the numerous morphological and biochemical components of amphibian metabolism.