11th Biology

Chapter 7 (Kingdom Protoctista or Protista) F.Sc 1st Year Short Questions

What are the similarities between green algae and the plants? or Write four characters of green algae similar to green plants.

  • Both have chlorophyll a chlorophyll and carotenoids present in the chloroplasts
  • Their main energy reserves are stored as starch.
  • Most green algae and plant possess cell walls with cellulose
  • Evidence from RNA sequencing also indicates that green algae and the plants form a monophyletic lineage

Give some characters of the feeding stage of slime mold or Myxomycota?

The feeding stage of slime mold is a plasmodium, a multinucleate mass of cytoplasm that can grow.to 30 cm (1 ft) in diameter. The plasmodium is slimy. in appearance, and found on damp, decaying logs and leaf litter. It often forms a network of channels that cover a large surface area. As it creeps along, it ingests bacteria, yeasts, spores and decaying organic matter.

What does slime mold do during unfavourable and favourable condition?

During unfavourable conditions, slime mold forms resistant haploid spores by meiosis within stalked structures called sporangia. When conditions become favourable again, spores germinate into biflagellated or amoeboid, reproductive or swarm cells which unite to form diploid zygote. Zygote . produces multinucleate plasmodium, each nucleus being diploid.

What is Physarum polycephalum?

The plasmodial slime mold, Physarum polycephalum is a model organism that has been used to study many fundamental biological processes, such as growth and differentiation, cytoplasmic streaming, and the function of cytoskeleton.

Why Phytophthora infestans was infamous ‘in human history? OR What is infamous role of Phytophthora infestans in human history? or What is Irish potato blight of 194 century?

Phytophthora infestans have played infamous (notorious, well-known) roles in human history as they were the cause of Irish potato famine of the 19th century. It causes a disease commonly known as late blight of potatoes. In Ireland in the 1840’s, the water mold caused potato tubers to rot in the fields. Many people (250,000 to more than 1 million) starved to death.

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