Tag: reproduction in animals

A. Morphallaxis - The reconstruction of an entire animal from a small fragment by reorganizing the existing cells, is called Morphallaxis.

B.Epimorphosis - The regeneration of tissues or organs through the dedifferentiation of existing, differentiated adult tissues

C.Epigenesis - The theory, now generally held, that an embryo develops progressively from an undifferentiated egg cell.

D. Auxetic growth – Growth takes place by the influence of auxins.

So, the correct option is ‘Auxetic growth’.

Formation of new cells or tissues in the body organs is called Regeneration. It is first discovered in hydra by Abraham Trembley.

So, the correct option is ‘Hydra’.

Gametes are the cells that merge with each other to create a unique organism during sexual reproduction. Gametes are the reproductive cells used to make a new organism called a zygote during sexual reproduction. There are distinct gametes in men and women. The sperm is called the male gamete. It's much lower and very mobile than the female gamete. It has a lengthy tail, flagellum, which makes it possible to move towards the female gamete. The egg or ova is called the female gamete. It's much bigger than the sperm and it's not moving

Unisexual animals have a reproductive structure that is either functionally male or functionally female. In angiosperms, this condition is also called diclinous, imperfect or incomplete. In animals, mostly the sexes are separate i.e. they are unisexual (male & female). For example, dogs, humans, tiger etc.

Monkey and Cat are mammals. They reproduce sexually. Higher animals do not reproduce asexually. Lower animals like Coelenterates reproduce asexually. Thus, the correct answer is option D.

Sexual reproduction in higher organisms is characterized by the formation of haploid gametes and their fertilization. The haploid gametes are produced by meiosis which has a half number of chromosomes as compared to the parent cell. It is also known as the reductional division. The haploid gametes obtained from both the parent fuse to form a diploid zygote. Mitosis is an equational division so it will not lead to the reduction in the chromosome.

The given statement is true. The daughter cells produced by asexual reproduction are similar to their parent i.e., they are genetically identical to their parent. In contrast, sexual reproduction produces a similar but genetically different offspring. In the process of sexual reproduction, haploid gametes produced by the meiotic division fuses to form a diploid zygote. A child inherits half of the genetic material from each parent. So, it may be they look alike but they are not identical to their parents. Instead, the child has the combination of characteristics inherited from both parents. Therefore, we can say that in sexual mode of reproduction, greater diversities are generated.

Greek word sexus means union. It is used in biology in terms of fusion of gametes in plants and animals. The male gametes is known as sperm and the female is known as ovum. Sexual reproduction is the reproduction which is caused by the fusion of gametes. The male and female gametes fuses to form zygote. 

An organism consists of two types of cells in their body, somatic cells and germs cells/ gametes. During the process of meiosis, a diploid number of chromosome is cut down to haploid. This division is an important event since after fertilisation haploid chromosomes from each gamete (male and female) fuse to retain the diploid state in the zygote. Diploid means two sets of chromosome and haploid is one set. Since here the diploid set is 16 thus one set will be half it, i.e, 8. Thus the answer A is correct.

• A zygote is formed by the fusion of a male and a female gamete. In this process, the sperm ruptures the cell wall of the ovum and releases the nucleic acid (chromosome). Thereby forming a diploid zygote. This fusion takes place during the process of fertilisation.