"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 4

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"Amphibians and Reptiles" Main Groups of Animals PPT Courseware 4

1. Amphibians

1. Representative animal - frog:

Fill in the names of each part of the frog:

(1) Development of frogs.

①Tadpoles: have tails, breathe with ___, and can only live in _____.

② Frog: _______ disappears and gives birth to ___________, which can live on land.

(2) Morphological and structural characteristics of frogs.

①Tympanic membrane: _________.

②Nostrils: ___________ when breathing.

③ Limbs: The forelimbs are short and can ________; the hind limbs are _____, with ___ between the toes, and can both jump and _____.

④ Breathing: Breathe with ___, and at the same time, assist breathing with _____.

⑤Skin: bare, capable of ________, moist skin densely covered with ________, capable of ________.

(3) Reproduction: Frogs lay their eggs in water and complete the fertilization process in the water.

2. Reptiles

1. Representative animal - lizard:

(1) Living environment: land.

(2) Morphological and structural characteristics.

①Body distribution: There is ___ behind the head, which can be flexibly rotated to facilitate __________________ on land.

② Limbs: _____, cannot jump, but can crawl quickly on the ground.

③Skin: Dry, covered with keratinous scales, which can both _____ the body and _______________.

④Respiratory organs: ___.

(3) Reproduction: Oviparous, with tough _____ protection outside the egg.

【Key Points】

1. Characteristics of frogs that are suitable for their amphibious life:

(1) Characteristics compatible with aquatic life.

①The head is triangular to reduce swimming resistance.

②The skin is exposed and can secrete mucus, making it suitable for land breathing.

③ There are webs between the toes of the hind limbs, suitable for swimming.

(2) Characteristics compatible with terrestrial life.

① It has nostrils, which are passages for breathing on land.

②Breathe with your lungs.

③Have eyes and eardrums, and developed sensory organs.

④ It has limbs and is suitable for land movement.

2. Characteristics of lizards suitable for terrestrial life:

(1) There is a neck behind the head, so the head can be rotated flexibly to find food and enemies on land.

(2) The skin is dry and rough, and the surface is covered with fine keratin scales. Such skin can reduce the evaporation of water in the body and is conducive to life on land.

(3) Breathe with the lungs. The breathing of the lungs alone can meet the oxygen needs of the entire body, unlike frogs that require skin to assist breathing. Therefore, lizards are suitable for living in relatively dry environments.

(4) The fertilization process and larval development do not require water.

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Update Time: 2024-10-05

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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