III. Name the following:
1. Two terrrestial habitats.
2. Two aquatic habitats.
3. Two plants and two animals of mountain regions
4. Four important abiotic factors needed for growth of plants
5. Breathing organs of fish and earthworms.
6.Any three modes of reproduction by plants.
Answers
Answer:
1.....Terrestrial habitats are ones that are found on land, like forests, grasslands, deserts, shorelines, and wetlands. Terrestrial habitats also include man made habitats, like farms, towns, and cities, and habitats that are under the earth, like caves and mines.
2.....They include rivers, lakes, streams, ponds, swamps, wetlands, bogs and lagoons. Marine habitats are aquatic habitats with salt concentrations of more than one percent. They include oceans, seas and coral reefs. Some habitats exist where saltwater and freshwater mix together.
3.....Coniferous trees like pines and spruces are typical examples of such mountain plants. At the foothills of mountains, where the temperature is moderate, vegetation such as temperate forest, scrubland, tundra is seen. Animals such as black bear, wolves, mountain goat, elk are examples of mountain habitat animals.
4.....Abiotic factors include water, sunlight, oxygen, soil and temperature.
5.....In earthworm, the exchange of gases occurs through the moist skin. In fishes it takes place through gills and in insects through the tracheae. In a plant the roots take in air present in the soil. Leaves have tiny pores called stomata through which they exchange gases.
6.....In plants there are two modes of reproduction, asexual and sexual. There are several methods of asexual reproduction such as fragmentation, budding, spore formation and vegetative propagation. Sexual reproduction involves the fusion of male and female gametes.
Explanation:
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Explanation:
1-dessert, forest
2-ponds, wetlands
3-plants:- oak,pine
Animals:- goat, wolf
4- sunlight, water,soil, temperature
5-earthoworm by their moist skin and fish through hills
6- budding, vegetative propagation, fragmentation , spore formation