How do spermatogenesis and oogenesis differ in terms of the number of gametes they produce? a. spermatogenesis produces four functioning gametes, and oogenesis produces one large gamete with three polar bodies. b. spermatogenesis produces one large gamete with three polar bodies, and oogenesis produces four functioning gametes. c. spermatogenesis produces two functioning gametes with two polar bodies, and oogenesis produces four large gametes.

Spermatogenesis produces four functioning gametes, and oogenesis produces one large gamete with three polar bodies. Statement A is correct. In spermatogenesis, all the four gametes are functional whereas in oogenesis only one large gamete serves as an ovum while other 3 degenerate and they are termed as polar bodies. During oogenesis, gamete production i.e. ovum production doesn't occur like spermatogenesis . During oogenesis, there arrives a stage when gamete production is halted at diplotene/diakinesis stage of meiosis - I and this is known as first meiotic arrest. During this process a polar body is generated. Thenafter, at the time of puberty meiosis resumes, but it is again arrested at meiosis -II stage. This is known as second meiotic arrest. This process is completed only when the sperm arrives and produces another polar body.

answer: angiosperms

dicots

angiosperms are highly evolved plants, they produce seeds which are enclosed within in a carple. these are the largest group of plants on earth. they include trees, shrubs, herbs and small flowering plants. angiosperms exhibit a flowering stage in their life cycle. the flower serves the function of reproduction and fruit formation in majority of angiosperms. dicot is the term used to describe flowering plants that have two seed leaves. dicots are plants which develop seeds which split into two parts called cotyledons. each cotyledon contains one embryo.

here, a small purple flower development indicates that the plant belongs to angiosperms and having two embryonic leaves indicates it belongs to dicots.  

geologic time scale (for gradpoint) =)