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Q. How are gametes formed in the pteridophyte life cycle, by mitosis or meiosis? What is the type of meiosis that occurs in pteridophytes?
In pteridophytes gametes are made by mitosis from special cells of the gametophyte. As in pteridophytes, in all plants, meiosis is sporic, that is cells of the sporophyte undergo meiosis and generate spores that then by mitosis develop into the gametophyte.
How do the products of meiosis I differ from those of meiosis II? In meiosis I, the offspring cells are haploid but every cell contains two copies of the chromosome because th
What are the methods of foams? There are two basic methods in the formation of foams i.e. a) whipping and b) condensation.
Which are the beings that form the kingdom Animalia? What are the two big groups into which this kingdom is divided? The kingdom Animalia is the animal kingdom. Commonly the ki
Illustrate about the primary minerals The minerals originally formed when once -heated magma (molten rock) cooled and formed solid igneous rocks (explained below) are called as
Q. How does the sexual arousal mechanism in women facilitate fecundation? During sexual arousal in women the vagina secretes substances to neutralize its acidity thus allowing
Greater Palatine nerve and vessel The greater palatine nerve runs forward in a groove on the inferior surface of the hard palate to communicate with nasopalatine nerve in inci
Calculate Temperature for Survival and Growth of Microorganisms? Survival and growth of microorganisms is also affected by the temperature. According to their temperature requi
Give three ways in which a polar bear is adapted to its environment. A polar bear is adapted to its environment by its high ratio of bulk to surface area, a thick water-repelle
Is the upward move of warm air good or bad for the dispersion of pollutants? The upward movement of warm air is a natural method of dispersion of pollutants. The air near the g
CAUSES OF EXTINCTION - 1 . HUNTING - Man started hunting wild animlas for food and safety trade and fun. It may be subsistence hunting, commercial hunting and sp
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