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Questions and Answers
Which of the following is true about larvae?
Which of the following is true about larvae?
- They are sexually immature forms of some animals and are anatomically distinct from the adult form. (correct)
- They lack nervous and muscle tissue.
- They are always morphologically identical to the adult form.
- They are found only in plants and fungi.
What do fungi lack?
What do fungi lack?
- Autotrophic nutrition
- Nervous and muscle tissue (correct)
- Multicellularity
- Cell walls of cellulose
How do plants, fungi, and animals differ in terms of nutrition?
How do plants, fungi, and animals differ in terms of nutrition?
- Plants are heterotrophs, fungi are autotrophs, and animals are autotrophs.
- Plants and fungi are autotrophs, animals are heterotrophs.
- Plants are autotrophs, fungi are heterotrophs, and animals are heterotrophs. (correct)
- Plants and animals are autotrophs, fungi are heterotrophs.
What is the probable origin of the first true animals?
What is the probable origin of the first true animals?
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What is the sequence of developmental stages from blastula to embryo?
What is the sequence of developmental stages from blastula to embryo?
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Study Notes
Larvae
- Larvae are the immature forms of animals that undergo metamorphosis.
- Larvae often have different feeding habits and appearances compared to adults.
Fungi
- Fungi lack chlorophyll, the pigment essential for photosynthesis.
- This means fungi cannot produce their own food and depend on external organic sources for nutrition.
Nutrition in Plants, Fungi, and Animals
- Plants are autotrophs, meaning they produce their own food through photosynthesis.
- Fungi are heterotrophs, obtaining nutrition by absorbing organic matter from their surroundings.
- Animals are heterotrophs and ingest other organisms for food.
Origin of Animals
- The first true animals likely evolved from a group of single-celled eukaryotes, specifically flagellated protists.
Development Stages
- Blastula: A hollow ball of cells formed after cleavage of a fertilized egg.
- Gastrula: A stage where the blastula invaginates, forming a two-layered embryo with an inner layer (endoderm) and an outer layer (ectoderm).
- Organogenesis: During organogenesis, the germ layers (endoderm, mesoderm, ectoderm) differentiate and form the various organs of the embryo.
- Embryo: The developing organism before birth or hatching.
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