BIOLOGY 1 Marks Question

• In the presence of sunlight, they are photosynthetic and autotrophs.
• In the absence of sunlight, they are predators(heterotrophs) of other smaller organisms.

1. They have no cell wall.
2. They engulf/ingest organic food material.
3. They exhibit amoeboid movement.

• T.O. Diener discovered viroids.
• Potato spindle tuber disease.

• It is used in filtration of oils and syrups.
• It is used in polishing of metals.

1. Ectomycorrhiza.
2. Endomycorrhiza.

1. locomotion and
2. food capture.

Some of them are as follows:

1. Amoeba
2. Entamoeba

1. Single-stranded RNA.
2. Double-stranded DNA.

1. They are non-cellular organisms.
2. They have an inert crystalline structure outside their host cell.

1. Cilia help in locomotion.
2. They also help in steering the water laden with food materials into the gullet, i.e. help in food capture.

• Ustilago causes smut disease.
• Puccinia causes rust disease.

• Both are formed within the sporangia.
• Zoospores are motile and aplanospores are non motile.

1. Cuscuta.
2. Venus fly-trap.

1. Aplanospores.
2. Conidia.

1. Protista.
2. Plantae.

• Louis Pasteur gave the term 'virus'.
• It means venom or poisonous fluid.

1. Eukarya.
2. Chlorophyll.
3. Mycoplasma.
4. Holozoic.
5. Chitin.

1. The cell wall of fungi is made of chitin, while that of plants is made of cellulose.
2. All fungi are heterotrophs and non-chlorophyllous while all plants are autotrophs and chlorophyllous.

1. Cholera: Vibrio cholerae.

2. Typhoid: Salmonella typhii.

1. Monera
2. Fungi.

1. W.M. Stanley.
2. M.W. Beijerinek.

1. Lichen.
2. Mycorrhizae.

1. Members of both the classes have septate and branched mycelia.
2. They reproduce asexually by conidia formation.

1. Plasmodium causes malaria.
2. Entamoeba histolytica causes amoebic dysentery.
3. Trypanosoma causes sleeping sickness.

1. They have red coloured pigments present in their cells make the sea glow red. They are called red tides.
2. They produce toxins such as saxitoxin that kills the fish.

1. Heterocysts.
2. Nostoc, Anabaena.