Hello ,

Features of class cyclostomata :

• The cyclostomes are jawless fishes.
• They have suctorial tongue .
• Endoskeleton is cartilaginous
• Notochord is persistent throughout life
• Elongated body bearing 6-15 pairs of gill slits for respiration
• Heart is 2-chambered
• Ectoparasites
• External fertilization
• Ammocoetes larvae may be seen
• Example : Petromyzon and

Hello,

For 3 mark answers you can mention the following points given below :

• It is also known as metameric segmentation or true segmentation. Here the body is divided into a number of segments where external divisions correspond to internal divisions.Eg Annelida, Arthropoda and chordata.
• In pseudo metamerism or false

Hello Student ,

Important Points to remember from phylum Ctenophora :

• Biradially symmetrical
• Diploblastic
• Tissue level of organisation
• Also known as Sea walnuts or comb jellies
• Body has 8 external rows of ciliated comb plates which help in locomotion
• Only Sexual reproduction is seen
• Monoecious
• Power of regeneration present
• Bioluminescence

Hello,

Features of class chrondrichthyes

• These are found in Marine habitats
• Cartilaginous fishes
• Body is dorsoventrally flattened or laterally compressed
• Pelvic fins have claspers in male
• Have heterocercal tail fin
• Endoskeleton is cartilaginous and dermal placoid scales present 'Swim bladder is absent
• Cold blooded or poikilothermous
• Oviparous or ovoviviparous
• development

Hello,

Ambulacral system is just another name of water vascular system which is seen in phylum echinodermata . It is coelomic in origin. A perforated plate called madreporite is present. These pores allow water to enter.

Tube feet another feature of this system which helps in locomotio, capture of food

Hello,

Important points to remember from phylum porifera :

• Body Wall Has outer pinacoderm, inner choanoderm made up of choanocytes or collar cells and a gelatinous acellular mesenchyme between them.
• They have Canal Sytem. It has minute pores on body wall called ostia through which water enters in central cavity-

Hello student,

This term "haplo diplontic life cycle" Related to plant life cycles.  in plant life cycle in sporic meosis The zygote divides to produce a deployed sporophyte. The sporophyte creates spores via same process and then those divided & produces haploid called gametophyte via mitosis. Gametophyte now make gametes

Hello ,

Life cycles of plants

Haplontic Life cycle : Sporophytic generation is represented only by one celled zygote.No free living sporophytic generation is seen. Haploid spore formation occurs from meiosis is zygote.Now three spores may degenerate or all four remain functional or they may further divide into meiospores. Haploid

Hello,

Gymnosperms are the first plants to have seeds. They are often referred to as having naked seeds because they do not have flowers, and their seeds develop on the surface of the reproductive structures of the plants rather than being contained in a specialized ovary.

All gymnosperms are found

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