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q in which areas of the globe is gymnosperm abundance noteworthythese plants are the typical vegetation of cold regions like the boreal forest or
q what is the evolutionary importance of the emergence of seeds in the plant kingdomthe evolutionary significance of the seed is related to the plant
q how different are gymnosperms from pteridophytes and bryophytesgymnosperms are not cryptogamic as pteridophytes and bryophytes are they are
q what are the major divisions and representing species of the gymnospermsthis group of plants can be separated into conifers pine sequoia cypress
q what is xaximmost pteridophytes have subterraneous stems similar to the substrate called as rhizomes xaxim is a kind of pteridophyte with an aerial
q what is the lasting form in the gametophyte pteridophytes or the sporophyte how can it be compared to bryophytesthe lasting form in pteridophytes
q how are gametes formed in the pteridophyte life cycle by mitosis or meiosis what is the type of meiosis that occurs in pteridophytesin
subphylum vertebrata 41700 species the vertebratesvertebral column of bone or cartilage head is well developed heart is ventrally situated
subphylum urochordata 13000 species sea squirtsnotocord is dorally situated nerve tube dorsally situated and is hollow chordate characteristics seen
subphylum mandibulatamost of them have three pairs of walking legs mandibles compound eyes antennas some with wings there are four classescrustacea -
subphylum cheliceratasix pairs of appendages four pairs being legs with paired chelicerae fangs there are three classes in this
phylum arthropoda 800000 to 1000000 speciesthey are known as jointed footed animals the appendages are paired and jointed with chitinous exoskeleton
phylum mollusca 47000 speciesthe segmentation and coelom may not exist diversification through modifications of head foot mantle and radula for
phylum platyhelminthes 13000 species flatwormthe body is flattened gastrovascular cavity is branched dense bodies with many cell layers mouth but no
phylum coelentrata 9000 speciesthe body is radial and made up of two cell layers gastro-vascular cavity is saclike tentacles and stinging cells are
kingdom animaliamulticellular heterotrophic eukaryotes tissues are specialised and most of them have organs mostly highly responsive only gametes are
dicotyledons 200000 speciesthe dicots are of diverse naturethe leaves are net veined stem contains ring of vascular bundles cambium tissue is present
class angiospermae flowering plantsflowers are the reproductive structures ovules are protected within ovary xylem vessels are present after
phylum tracheophytatracheophytes mean vascular plants tracheophyta includes ferns the gymnosperms and the flowering plants they have appeared some
hepaticae liverwortsthe gametophyte is thalloid body or simple stem and leaves with aquatic or semi-terrestrial habit rhizoids are multiceillularsome
phylum bryophytathe bryophytes include the mosses and their close relatives they are widely diverse and grow in a variety of place1 life cycle shows
phylum phaeophyta brown algae1 they are brown algae apart from chlorophyll they have brown pigment ie fucoxanthin which predominates2 they are one of
phylum rhodophyta red algae1 the photosynthetic pigments include red pigments phycoerythrin and blue pigment phycocyanin apart from chlorophyll of
phylum chlorophyta green algae1 the chlorophyll is the main photosynthetic pigment2 there is little or no cell differention in thallus thallus is
kingdom plantaethe kingdom plant are includes multicellular eukaryote organisation with photosynthetic nutrition typically cell has cellulose wall