NEET SHORT NOTES & TRICKS

2022-08-18 14:13:15 @neetshort_notes Open / Comment

2022-08-18 05:52:55 @neetshort_notes Open / Comment

2022-08-16 17:50:58 @neetshort_notes Open / Comment

2022-08-15 14:01:53 Cell - the unit of life
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2022-06-21 06:59:21 Fungi examples
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2022-06-20 08:35:36 ╔═════════════════════╗
★ PHYLUM HEMICHORDATA ★
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● have a rudimentary structure in the collar region called stomochord
●small group of worm-like marine animals
● body is composed of anterior proboscis, a collar and a long trunk
● Respiration – gills.
●Excretory organ - proboscis gland
● Fertilisation is external. Development is indirect

EXAMPLES

★Balanoglossus
★Saccoglossus


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2022-06-20 08:34:38 ╔═════════════════════╗
★ PHYLUM :ECHINODERMATA☆
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■endoskeleton of calcareous ossicles
■All are marine
■ adult echinoderms- radially symmetrical, larvae - bilaterally symmetrical
■ presence of water vascular system
■ excretory system - absent
■ Fertilisation external, Development is indirect

EXAMPLES

☆Asterias - Star fish
☆ Echinus - Sea urchin
☆ Antedon - Sea lily
☆ Cucumaria - Sea cucumber
☆ Ophiura - Brittle star

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2022-06-20 08:33:48 ╔═══════════════════╗
★ PHYLUM MOLLUSCA ★
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■ second largest animal phylum
■ covered by a calcareous shell
■ body is unsegmented with a distinct head, muscular foot and visceral hump
■anterior head region has sensory tentacles.
■ mouth contains a file-like rasping organ for feeding, called radula
■dioecious
■oviparous with indirect development.

EXAMPLES :

☆Pila - Apple snail
☆Pinctada - Pearl oyster
☆ Sepia – Cuttlefish
☆ Loligo – Squid
☆ Octopus - Devil fish
☆Aplysia- Seahare
☆Dentalium - Tusk shell
☆Chaetopleura – Chiton

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2022-06-19 12:28:29 ╔════════════════════╗
★ PHYLUM :ARTHROPODA★
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■largest phylum (two-third of recognized animals)
■bilaterally symmetrical
■covered by chitinous exoskeleton
■ body consists of head, thorax and abdomen
■ have jointed appendages
■Respiratory organs: gills, book gills, book lungs or tracheal system
■ Sensory organs: antennae, eyes, statocysts or balancing organs are present.
■ Excretion - malpighian tubule
■ Mostly dioecious.
■Fertilisation is internal
■ mostly oviparous

EXAMPLES

■Economically important insects – ☆Apis (Honey bee)
☆Bombyx (Silkworm),
☆Laccifer (Lac insect)

■ Vectors
☆Anopheles
☆ Culex
☆Aedes (Mosquitoes)

■Gregarious pest
☆Locusta (Locust)

■Living fossil
☆ Limulus (King crab).

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2022-06-19 08:34:30 ╔═══════════════════╗
★ PHYLUM : ANNELIDA ★
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■Metamerically segmented
■ possess longitudinal and circular muscles: help in locomotion
■ lateral appendages- parapodia: which help in swimming.
■ Nephridia: osmoregulation and excretion
■ Neural system consists of paired ganglia
■Dioecious/ monoecious
■ Reproduction is sexual.

EXAMPLES :
★ Nereis
★Pheretima – Earthworm
★ Hirudinaria - Blood sucking leech

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