Tag: lifespan, reproduction and variation

The fertilization which takes place inside the female's body is called internal fertilization, hen shows internal fertilization.
The fertilization which takes outside the female's body is called external fertilization as in the case of frogs.
Sperm is the male reproductive cell or the male gamete.
Ovum is the female reproductive cell or the female gamete.
Budding is a form of asexual reproduction in which a new organism develops from an outgrowth or bud due to the cell division at that particular site as in case of hydra.
Binary fission is a form of asexual reproduction used by all prokaryotes (including amoeba) where the cell divides into two nearly equal-sized daughter cells.
A zygote is a diploid cell that is formed by the fusion of male and female gamete. So, the fertilized egg is the zygote.
Thus, the correct answer is option C.

Seed is the product of ripened ovule after fertilization by pollen grains. These seeds further grow into a new plant. Some plants are reproduced without forming seeds but through the asexual reproduction. New sugarcane plants are produced from a mature sugarcane stem, rose from branch and potato from another potato. 

Meiosis does not occur during asexual reproduction. Meiosis is the process of producing gametes which is occur in sexual reproduction. On the other hand, mitosis is simply the process of cell division in asexual reproduction. This is the process that animals are going through during regeneration. 

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.