36 Questions
What is the embryonic origin of epithelial tissue?
Endoderm and ectoderm
Which of the following is NOT correctly matched with its germ layer tissue?
Ectoderm - Liver
What is unique to animals?
Ability to move
What is the most likely ancestor of all animals?
Simple multicellular organism
What is a characteristic of diploblasts?
Two embryonic tissue layers
Which groups of animals are non-bilaterian?
Sponges, cnidarians, and ctenophores
What is NOT a benefit of indirect development in animals?
Increase parental investment
How do animals reproduce?
Sexually through internal fertilization
How are animals classified based on egg and embryo development?
Viviparous, oviparous, or ovoviviparous
What do sponges have that ctenophores lack?
miRNAs
What is the primary function of the outer layer of epithelial tissue in most animals?
To provide protection
Which of the following is a characteristic shared by all animals?
Multicellularity
What is the primary difference between diploblasts and other animals?
Number of germ layers
Which of the following groups of animals is characterized by having only two germ layers?
Diploblasts
What is the primary advantage of internal fertilization in animals?
Protection of the embryo
Which of the following is a characteristic of ovoviviparous animals?
Eggs develop internally and young are born alive
What is the outer layer of protective tissue that lines the surface of most animals?
Epithelial tissue
Which two embryonic tissue layers are present in diploblasts?
Endoderm and ectoderm
What is the primary characteristic that distinguishes animals from other kingdoms?
Ability to reproduce sexually
What is the likely origin of all animals?
Ancient multicellular organisms
Which of the following groups of animals consists of three distinct groups?
Non-bilaterians
What type of fertilization occurs internally in animals?
Internal fertilization
What is the function of the epithelial tissue in most animals?
Protection
Which of the following is a characteristic of oviparous animals?
Eggs develop externally
What is the primary difference between sponges and ctenophores?
Presence of miRNAs
What is the primary benefit of indirect development in animals?
Produce a large number of eggs
What is the primary function of the epithelial tissue in most animals?
To provide protection
What is the characteristic that distinguishes diploblasts from other animals?
Presence of two germ layers
What is the primary difference between oviparous and ovoviviparous animals?
Location of egg and embryo development
What is a characteristic shared by all non-bilaterian animals?
Presence of two embryonic tissue layers
What is the likely ancestor of all animals?
Simple multicellular organism
What is the primary benefit of indirect development in animals?
Produces large numbers of eggs
What is unique about the embryonic origin of epithelial tissue?
Originates from endoderm and ectoderm
What is the primary characteristic of oviparous animals?
Eggs develop outside the mother's body
What is the primary difference between ctenophores and sponges?
Presence of miRNAs
How are animals classified based on egg and embryo development?
Oviparous, ovoviviparous, or viviparous
Study Notes
Embryonic Origin of Epithelial Tissue
- Epithelial tissue originates from the endoderm and ectoderm.
Characteristics of Animals
- Unique traits: reproduce sexually through internal fertilization, produce large numbers of eggs, and have a larval stage in their life cycle.
Development of Animals
- Animals can be grouped as viviparous, oviparous, or ovoviviparous depending on where eggs and embryos develop following internal fertilization.
- Indirect development is beneficial for producing a large number of eggs, larvae, and reproductive stages.
Origin of Multicellularity
- Sponges-first hypothesis suggests that sponges were the first multicellular animals, supported by the presence of miRNAs in sponges but not in ctenophores.
Ancestry of Animals
- The last common ancestor of all animals was likely a multicellular organism.
Body Structure of Animals
- Diploblasts have two embryonic tissue layers: ectoderm and endoderm.
- Non-bilaterian animals include three groups: sponges, cnidarians, and ctenophores.
Explore the embryonic origins of epithelial tissue in animals, including the skin and other organs. Learn about the development of this protective tissue from endoderm and ectoderm.
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