Question
Describe briefly the four major groups of Protozoa.
✓
Answer
The four major groups of Protozoa are:
- Amoeboid protozoans: These organisms live in fresh water, sea water or moist soil. They move and capture their prey by putting out pseudopodia (false feet) as in Amoeba. Marine forms have silica shells on their surface. Some of them such as Entamoeba are parasites.
- Flagellated protozoans: The members of this group are either free-living or parasitic. They have flagella. The parasitic forms cause diaseases such as sleeping sickness. Example: Trypanosoma.
- Ciliated protozoa or ciliates: They are aquatic individuals that form a large group of protozoa. Their characteristic features are the presence of numerous cilia on the entire body surface and the presence of two types of nuclei. All the cilia beat in the same direction to move the water laden food inside a cavity called gullet. Example: Paramoecium, Vorticella,etc.
- Sporozoans: They include disease causing endoparasites and other pathogens. They are uninucleate and their body is covered by a pellicle. They do not possess cilia or flagella. They include the malaria causing parasite Plasmodium.
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(a) Proteins & DNA
(b) Proteins only
(c) Proteins & RNA
(d) Proteins & DNA / RNA
(2) Bacteriophages are usually :
(a) Single stranded DNA viruses
(b) Double stranded RNA viruses
(c) Double stranded DNA viruses
(d) Single stranded RNA viruses
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(a) Pneumonia (b) Herpes (c) Mumps (d) Smallpox
(4) Select the incorrect statement regarding Capsomeres:
(a) Capsomeres are sub-units of Capsid
(b) Capsomeres are made of peptidoglycans
(c) Capsomeres may be arranged in helix or polyhedron
(d) Capsomeres are made of proteins
(5) Which of these is not a symptom of viral infection in crops:
(a) Leaf rolling (b) Curling of leaf (c) Decay of roots (d) Vein clearing
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| Saprolegnia | Yeast | Agaricus | Cercospora |
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| Albugo | Neurospora | Ustilago | Pyricularia |
| Pythium | Peziza | Lycoperdon | Fusarium |
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