Garima Goel Biology NEET CUET
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Morphology
NEET PYQS
Aestivation
✓Mode of arrangements of Sepals or
petals in floral bud with respect to the other members of the same whorl is called Aestivation.
✓Main 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 ❤️❤️Plant Kingdom
NEET 2023
Mosses
✓Predominant stage of the life Cycle of a
Moss is the Gametophytes
✓ Consists of two stages:
1 Protonema Stage
2 Leafy Stage
✓Protonema Stage
-Develops directly from a spore
-It is creeping, green,branched and
frequently filamentous stage
✓Leaf 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
✓Sex oragan are antheridia and
archeogonia(Present at apex of Leaf
Shoot)
✓After Fertilisation
Zygote develops into Sporophyes
(Consisting of Foot ,seta and Capsule)
✓Sporophytes in mosses is more
elaborate than Livewortes.
✓Eg Funaria ,Polytrichum and sphagnum
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