Garima Goel Biology NEET CUET
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Morphology
NEET PYQS
Aestivation
โMode of arrangements of Sepals or
petals in floral bud with respect to the other members of the same whorl is called Aestivation.
โMain types of aestivation:
1 Valvate
2 Twisted
3 Imbricate
4 Vexillary
1 Valvate Aestivation
When Sepal or petals in a whorl
just touch one another without
Overlapping
Eg Calotropis
2 Twisted Aestivation
If one margin of the appendage
overlaps that of the next one
Eg China Rose,Lady finger,
Cotton
3 Imbricate Aestivation
If the margin of Sepals or petals
overlap one another but not in
any particular direction
Eg Cassia , Gulmohar
4 Vexillary Aestivation
There are 5 petals , largest
(Standard) overlap two lateral
petals(Wing)which in turns
Overlap two smallest anterior
petals(Keel)
Eg Pea , Bean
Give Hearts โค๏ธโค๏ธPlant Kingdom
NEET 2023
Mosses
โPredominant stage of the life Cycle of a
Moss is the Gametophytes
โ Consists of two stages:
1 Protonema Stage
2 Leafy Stage
โProtonema Stage
-Develops directly from a spore
-It is creeping, green,branched and
frequently filamentous stage
โLeaf Stage
-Develops from secondary Protonema
as a lateral bud
-Consist of upright,slender axes bearing
Spirally arranged leaves
-They are attached to the soil through
multicellular and Branched rhizoids
-Bears Sex organs
Reproduction
1 Vegetative Reproduction
By Fragmentation and budding in the
Secondary Protonema
2 Sexual Reproduction
โSex oragan are antheridia and
archeogonia(Present at apex of Leaf
Shoot)
โAfter Fertilisation
Zygote develops into Sporophyes
(Consisting of Foot ,seta and Capsule)
โSporophytes in mosses is more
elaborate than Livewortes.
โEg Funaria ,Polytrichum and sphagnum
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