In which of the following unicellular organisms is a large macronucleus found for nutritional functions and a smaller micronucleus for reproductive functions?

Read the following statements and answer the question given below:
$(i)$ They are saprophytic protists.
$(ii)$ Under suitable conditions,they form an aggregation (called plasmodium) which may grow and spread over several feet.
$(iii)$ During unfavourable conditions,the plasmodium differentiates and forms fruiting bodies bearing spores at their tips.
Which of the following class of protists is being described by the above statements?

"Golden algae" is the common name for algae that belong to ............ .

Which of the following is odd one with respect to algal members according to the five kingdom classification system?

Which of the following is false regarding nutrition in $Amoeba$?

What is the difference between a Red Sea and a red tide?