four groups of gymnosperms

. The diploid zygote develops into an embryo which remains enclosed within the ovule. The ovule then transforms itself into a seed. The seed remains attached to the megasporophyll and is not enclosed by a fruit. The ripe and dry seeds are shed. Under suitable conditions the seeds germinate and deve..

The gymnosperms are seed producing land plants. However, the seeds are not enclosed in fruits. Most of them have now become extinct and only about 900 species are known to be surviving. The living gymnosperms are widely distributed in the cold climates where snow, rather t..

In the long form of the periodic table, elements are grouped into four main blocks, purely on the basis of electronic configurations. Elements are grouped in blocks 's', 'p', 'd' and 'f' depending on the nature of orbital(s) into which the last electron of the atom ent..

In the long form of the periodic table, elements are grouped into four main blocks, purely on the basis of electronic configurations. Elements are grouped in blocks 's', 'p', 'd' and 'f' depending on the nature of orbital(s) into which the last electron of the at..

Blood Groups - There are four types of blood among the humans. These are called the blood groups . The blood groups are classified based on the presence or absence of certain proteins and antibodies. In human blood, the membranes of the Red blood Corpuscle ha..

The atomic radii of elements increases from top to bottom in a group because the nuclear charge increases with increasing atomic number. Although, there is an increase in the principal quantum number from one atom to another, the number of electrons in the valence shell remain the same. ..

There are 40 children in a class. The teacher asks the children to form into groups of four. How many groups will be formed? => 10 or 8 or 12 or 5..

Which group has all symmetrical letters? => Group 1 or Group 3 or Group 4 or Group 2..

Which group has no symmetrical letter? => Group 4 or Group 3 or Group 1 or Group 2..

Which group does not have all symmetrical letters? => Figure 1 or Figure 2 or Figure 3 or Figure 4..