13th International Biology Olympiad Latvia, 2002 Ministry of Education and Science University of Latvia Association of Biology Teachers
4 Kronvalda boulv., Riga LV-1586, LATVIA phone: +371-7034860, +371-7334125, Fax: +371-7223801, email: ulkoro@latnet.lv

Final Report

• 4. Tasks
  • 4.1. Practical tasks
  • 4.2. Theoretical tasks
    • 4.2.1. Theoretical test Part A
    • 4.2.2. Theoretical test Part B

4.2. Theoretical tasks

4.2.1. Theoretical test Part A

Biosystematics

A 68. What do all Angiosperms have that all Gymnosperms lack?

A. vascular cambium

B. secondary xylem

C. pericarp

D. cotyledons

E. seeds

A 70 . Which of the following is false about the life cycle of mosses?

A. Gametophytes arise from a protonema

B. External water is required for fertilization

C. Gametes are produced by meiosis

D. Antheridia and archegonium are produced by the gametophytes

E. Sperms have flagella

A 71. Many benthic marine invertebrates have free-living planktonic larvae. Which of the following invertebrates all have planktonic larvae?

A. Nematoda, Echinodermata, Polychaeta, Turbellaria

B. Polychaeta, Turbellaria, Echinodermata, Corallium

C. Decapoda, Echinodermata, Corallium

D. Bivalvia, Turbellaria, Porifera, Nematoda

E. Cephalopoda, Gastropoda, Bivalvia, Echinodermata

A 72. Which statement regarding the systematics of following taxa is correct?

A. Phylum Platyhelminthes includes Hirudinea, Turbellaria and Cestoda

B. Phylum Arthropoda includes Chilopoda, Polychaeta, Crustacea

C. Phylum Platyhelminthes includes all the parasitic worms

D. Phylum Arthropoda includes water insects and water mites

E. Phylum Echinodermata and phylum Cnidaria are close relatives, as they possess a radial symmetric body

A 73. A biology student made some comments after examining Turbellaria, tapeworm (Taeniasp.) and trematoda (Fasciola hepatica). Which of his comments is not true?

A. Reduction in digestive system evolved in conjunction with passing to the parasitic life style

B. With passing to the parasitic life style, the reproduction capacity has increased

C. The total disappearance of the digestive system in the parasitic species did not cause any additional change in the body

D. The excretory systems of these animals basically resemble each other

E. The parasitic life style did not cause any change in the basic structural plan of the nervous system

A 74. Parasites are adapted to the host and its life cycle. Which of the following statements about parasitic species is correct?

A. Numerous Nematoda, Turbellaria and Cestoda are endoparasites in the intestine of fishes

B. Fleas, lice and most female mosquitoes are ectoparasites of warm-blooded animals

C. Cyclops are the intermediate hosts of Trematoda and Cestoda

D. The parasitic Nematoda and Turbellaria develop directly without an intermediate host

E. Trematodes and Turbellaria are endoparasites of cold-blooded animals

A75. Heterothermy is the ability to reduce body temperature during hibernation until it gets close to the environmental temperature. Which of the following animal groups include heterothermal organisms?

A. Rodentia, Chiroptera, Insectivora

B. Only Carnivora

C. Carnivora, Chiroptera

D. Penguins

1. All mammals living in burrows