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Verify understanding of basic biological hierarchy: Cells, difference between unicellular and multicellular organisms, and the definition of a tissue.
Explain the hierarchy of organization (Cell -> Tissue -> Organ -> Organ System) using the introduction on Page 79. Define 'Division of Labour' in multicellular animals.
Ever wonder how complex animals are built? It’s all about teamwork! Unlike unicellular organisms where one cell does it all, multicellular animals organize their bodies to handle complex functions.
Just like bricks build a house, biological units build up step-by-step:
In complex animals, not every cell does every job. Instead, they split up the work.
Division of Labour means that specialized cells, tissues, organs, and systems handle specific tasks. This efficient organization allows the body to function better and ensures the survival of the organism as a whole!
Create a cloze test based on the definitions of Tissues, Organs, and Organ Systems from Page 79, Paragraph 1 & 2.
In multicellular animals, a group of similar cells along with intercellular substances performing a specific function is called a . These tissues are organized in specific patterns to form an , such as the stomach or heart. When two or more organs interact to perform a common function, they together form an .
Introduce the Indian Bullfrog (Rana tigrina). Cover its classification (Chordata, Amphibia) and its cold-blooded nature (poikilotherms) from Page 80.
Did you know frogs can live on both land and in freshwater? The most common species found in India is the Rana tigrina (Indian Bullfrog).
Biologists classify these jumping creatures under:
Frogs are cold-blooded animals, or poikilotherms. This means they do not have a constant body temperature; instead, it changes with the environment.
To survive extreme weather, they take shelter in deep burrows:
Did you know? Frogs can change color to hide from enemies! This protective camouflage is called mimicry.
Create flashcards for key survival terms found on Page 80: Poikilotherms, Camouflage, Mimicry, Aestivation (Summer Sleep), and Hibernation (Winter Sleep).
Display 'Figure 7.1 External features of frog' from Page 80. Highlight the Head, Trunk, Fore limb, and Hind limb.
Figure 7.1: The frog's body is divided into a head and trunk. Note the absence of a neck and tail, and the presence of fore and hind limbs.
Describe the frog's skin (mucus, moist, colors) and sensory organs (eyes, nictitating membrane, tympanum) based on Page 80, Section 7.2.1.
Let's explore the frog's unique body covering and specialized sensory organs found on the head!
A frog's skin is vital for its survival:
Frogs have specialized features to help them sense their environment: