PHYLUM - CTENOPHORA - GSEB SCIENCE HUB

Role of nutrients and their deficiency Symptoms | GSEB SCIENCE HUB

Published by GSEB SCIENCE HUB On January 30, 2023

Role of nutrients and their deficiency Symptoms | GSEB SCIENCE HUB Nitrogen ▪️Impart green colour to plant encourages vegetative growth ▪️ Nitrogen is essential constituent of protein ▪️ Constituent of Protoplasm of chlorophyll and coenzyme. ▪️ Play important role in synthesis of auxin Deficiency ▪️ Lower leaves become yellow and dries. ▪️V shaped chlorosis on older leaves or yellowing at tip. Disease ▪️Starvation disease due to nitrogen deficiency. ▪️Buttoning in cauliflower. Phosphorous ▪️Increase the disease resistance. ▪️ Enhance new cell formation and necessary for root development. ▪️Required for grain formation and maturity of grains. ▪️Phosphorus is essential constituent for nucleic acid and phytin. ▪️Most essential functions are energy storage and transfer energy act as "energy currency". Deficiency ▪️Due to deficiency of single element the life cycle of plant can't be completed hence (Agricultureexamslibrary) Phosphorus is called " key of life " ▪️De...

PHYLUM - CTENOPHORA

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NEET SHORT NOTES & TRICKS:

❇️PHYLUM - CTENOPHORA❇️

👉They are commonly known as "Sea-gooseberries" or "Comb-jellies" or "Sea-walnuts

👉Bioluminescence (The property of a living organism to emit light) is well marked

👉 They are radially symmetrial,
Diploblastic organism with tissue grade body organisation

👉They are exclusively marine

👉Digestion is both extracellular and intracelluar

👉Locomotion takes place by the presence of 8 ciliary comb plates on the body surface.

👉Sexes are not separate. Reproduction takes place only by sexual means. Fertilization is external.
👉Development is of indirect type. Life cycle involves a free living Cydippid larval stage.
e.g. 1. Pleurobrachia
2. Ctenoplana

❇️PHYLUM - PLATYHELMINTHES❇️

👉They have dorsoventrally flattened body hence are called flat worms.

👉These are mostly endoparasites found in animals including human being but some are Free living (aquatic).

👉Excretion occurs through specialised cells called flame cells or Solenocytes(Protonephridia).

👉They also help in osmoregulation

👉Locomotary organs are absent in these animals but adhesive organs like suckers, hooks etc are present in
parasitic form.
👉Body is Bilaterally symmetrical and body organisation is of organ /organ system grade.

👉Body is Triploblastic

👉They are Bisexual.

👉Reproductive system is complex and well developed. Fertilization is internal.

👉Development indirect through many larva stages

👉Some members like Planaria possess high regeneration capacity

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