Question

you have also been tasked with assessing the algai populations present in the soil. like protozoa, algae are often thought of as aquatic organisms, however, algae can have many important functions within the soil. for example they can help maintain moisture via secretion of a hypogastric compound absorbs moisture from the air. in addition algae help prevent soul erosion by working as a cement or binding agent, holding particles together. while some algae can reproduce asexually they can also reproduce sexually with a life cycle known as the alteration of generations

complete the alteration of generations life cycle diagram by dragging the correct label to the appropriate space

Answer 1

Answers Algae and Protozoa are photo synthetic organisms that belong to one kingdom Protista, live in Wafer humid places ( they can grow where ever there is sumlight and little wafer availability Hence they can grow below the soil surface exposed to light | and has 'miform temperofure and moisture. Compared to Bacteria and Fungi, Algae are less numerous in sol and more numerous in soil compared to protozoa. Algae colony vary from soil to soillacid, neutral, olkaline...), and mainly consists of Green algae, Dicefoms' and Yellow green algae of which the first two are predominant. Protozoa are present of 15 cm to 20cm of top soil and consists of flagella, Amoebas and Ciliates of which the Flagella are predominant. Algae shows Desiccafion tolerance , secrepes a body fluid Mucilage - a viscous body secretion (confening hygroscopic polymers/ compounds) that contribufes to its aggregation and can absorb afer quickly from surrounding environment and refain it for a long time. Algae grow thick on the upper surface of soil acfing as a surface binding cement and thus prevents soilešosion- Algae reproduction may be Vegetation, Asexual and sexual reproduction. Asexual reproducfion :- Offspring arises from single parent (Stringently called Agamogenesis = no gamele fusion) in algae takes place by, formation of various types of sporangia (spores formed in different types of algae).

Examples :- Zoospores - chlamydomonas. Aplanospores — Vaucheria. Azpospores - Chlorella. Sexual reproduction - most advonced type of reproduction Occung in three types. U Isogaemy - eg: Spirogyra. ☺ Angiogamy - Volvox . ☺ Oogomy-egi Volvox. Alteration of Generation cycle @ zygote o Meiosis @ male and female spore ② male Gamefe @ female Gamefe ② fusion