All questions
6Why is variation beneficial to the species but not necessarily for the individual?
Variation helps a species survive environmental changes by ensuring some members have traits suited to new conditions, but an individual with a variation may not personally benefit from it.
How does binary fission differ from multiple fission?
In binary fission, a parent organism divides into two daughter cells, while in multiple fission, the parent divides simultaneously into many daughter cells.
How will an organism be benefited if it reproduces through spores?
Spores have thick protective walls, can survive harsh conditions, are light and easily dispersed by wind, and can remain dormant until conditions become favourable.
Why does menstruation occur?
Menstruation occurs when the egg is not fertilised; the thickened uterine lining breaks down and is shed along with blood and mucus through the vagina.
What are the advantages of sexual reproduction over asexual reproduction?
Sexual reproduction produces genetic variation through the combination of genes from two parents, making offspring better adapted to survive environmental changes and evolve over generations.
What are the functions performed by the testis in human beings?
The testes produce male gametes (sperms) and secrete the male sex hormone testosterone.