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Why are budding, fragmentation and regeneration all considered as asexual types of reproduction? With neat diagrams explain the process of regeneration in Planaria.

In Budding, fragmentation and regeneration only a single parent is involved and there is no formation of gametes hence they are considered as... View Article

What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

The ratio of chromosome number between an egg and its zygote is 1:2. Sperm contains the genetic material from the father while the egg... View Article

In the given Figure label the parts and mention their functions (a) Production of egg (b) Site of fertilisation (c) Site of implantation (d) Entry of the sperms

Answer a) Ovary (production of egg) Ovaries are the female reproductive organs in which the female germ cells or eggs are produced. b) Oviduct... View Article

What are the benefits of using mechanical barriers during sexual act?

Using mechanical barriers during sexual act like condom helps in avoiding pregnancy as it does not allow the sperm to reach the egg and form... View Article

What changes are observed in the uterus subsequent to implantation of the young embryo?

If fertilization occurs, the loss of corpus luteum is prevented. There is formation of new special tissue called as placenta which connects... View Article

What changes are observed in the uterus if fertilisation does not occur?

The lining of the uterus slowly breaks and comes out through the vagina as blood and mucus. Every month uterus prepares to receive a fertilized... View Article

Trace the path of sperm during ejaculation and mention the gland and their functions associated with the male reproductive system.

Path of sperm during ejaculation: testes → epididyntis → vas deferens → prostate → urethra. Sperm comes out from testis into... View Article

How are general growth and sexual maturation different from each other?

Growth is a positive change in the size, often over a period of time which includes physical growth in height, weight, change in shape and size... View Article

Reproduction is linked to stability of population of a species. Justify the statement.

Reproduction is directly linked to the stability of the population of species because it helps in replacing the ageing population with the new... View Article

Where is the zygote located in the flower after fertilization?

After fertilization, zygote is located in the ovary of the flower. Fertilization can be defined as the fusion of the male gametes (pollen) with... View Article

Is the chromosome number of the zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?

The chromosome number of the zygote, embryonal cell and adult of a particular organism is always constant. Meiosis is the cell division which... View Article

Why cannot fertilisation take place in flowers if pollination does not occur?

The transfer of pollen grains from the anther of a flower to the stigma of the same or another flower is known as pollination. It is done by... View Article

In the tobacco plant, the male gametes have twenty-four chromosomes. What is the number of chromosomes in the female gamete? What is the number of chromosomes in the zygote?

Number of chromosomes in female gamete is 24, number of chromosomes in zygote is 48 Chromosomes are the genetic material present in all the... View Article

From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of the organism and answer the following questions. (a) Do larger organisms have more number of chromosomes/cells? (b) Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes? (c) More the number of chromosomes/cells greater is the DNA content. Justify.

(a) No, there is no relationship between size of organism and its chromosome number. (b) No, process of reproduction follows a common pattern and... View Article

Would a Planaria cut vertically into two halves regenerate into two individuals? Complete Figure, D and E by indicating the regenerated regions.

Yes Planaria cut vertically into two halves can regenerate into two individuals.Planaria are free-living flatworms that live in quiet ponds or... View Article

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