Question

(a) Choose the most appropriate answer.
A) Internal fertilization occurs
B) In female body
C) Outside female body
D) In male body
E) Outside male body

(b)A tadpole develops into an adult frog by the process
A)Fertilization
B)Metamorphosis
C)Embedding
D)Budding

(c)Number of nuclei present in zygote
A)None
B)Two
C)One
D)Four

Answer 1

The process of fertilization is associated with the female body.Internal fertilization is characterized by sperm fertilizing the egg within the female. Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. Zygote is a eukaryotic cell. It is formed by the fusion of two gametes. The whole genetic information of both individuals is present in the Zygote.

Complete answer:
a)Internal fertilization is characterized by sperm fertilizing the egg within the female. The three methods include: oviparity (egg laid outside the female body), oviparity (egg being held within female), and viviparity (development within female followed by live birth).

As we can see, the word ‘internal’ means which is of or situated inside.
So, we can say that the process of fertilization occurs inside female bodies.
We know that fertilization is associated with the female body.

Hence the correct answer is option ‘B’.

b) A frog is an amphibian.Amphibians do not reproduce by the processes of Fertilization, Embedding or Budding. They are significantly different from reptiles in this regard.Metamorphosis in amphibians is the transformation of the larva to a miniature adult replicate, and usually from an aquatic to a terrestrial or semi-terrestrial lifestyle. Metamorphosis marks the beginning of the end of larval life.So, we can say that the tadpole (baby frog) develops into an adult frog by the process of metamorphosis.

Hence the correct answer is option ‘B’.

c)Ovum (female gamete) and sperm (male gamete) are both Haploid entities.Zygote is formed by fertilization. i.e. fusion of male and female gametes.Thus, in zygote male and female gametes combine together to form Diploid zygote.That is, the number of nuclei present in a zygote is two.

Hence the correct answer is option ‘B’.

Note: >Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. The embryo is isolated within the female. This limits predation on the young.

Metamorphosis is a biological process by which frogs and other animals physically develop after birth or hatching. Most importantly, during metamorphosis, some salient features the frog acquires which could not be seen in tadpoles.Frogs start as eggs which hatch and grow into tadpoles.
The ovum and sperm create zygote. Thus, we can say that the zygote is the product of fertilization. So, by its nature, it is included inDiploid category, because sperm and ovum have their respective nuclei.