2009 Junior High School Biology Olympiad Test Questions
This test paper is divided into two parts: Volume I (multiple-choice questions) and Volume II (non-multiple-choice questions). The total score of the paper is 100 points and the test time is 90 minutes.
Paper I (multiple choice questions ***50 points)
Notes on answering questions:
1. Please fill in the items within the sealed line clearly before answering the questionnaire.
2. Fill in the answers to Part I in the "Multiple Choice Answer Column", otherwise zero points will be given.
1. Multiple choice questions
1. Which of the following plant cells can still perform its functions after death ( )
A. Cells that make up ducts B. Cells of chlamydia
C. Cambium cells D. Cells that make up ducts and sieve tubes
2. Which of the following types of organisms does not have a cell membrane? ( )
A. SARS virus B. Paramecium C. Bacteria D. Kelp
3. The following are mechanical tissues ( )
A. The epidermis of onion scale leaves B. The cambium layer of dicotyledonous plant stems
C. Wood fiber and bast fiber D. Sophora leaf flesh
4. The picture below is a schematic diagram of the food web of an ecosystem. To maximize the yield of organisms at the highest trophic level, the food chain that concentrates energy to the highest trophic level is ( )
A.A→B→C→E< /p>
B.A→B→D
C.A→D
D.A→B→C
5. Which of the following statements about animals’ adaptation to temperature is correct ( )
A. Under low temperature conditions, the lifespan of ectothermic animals is longer. As the temperature increases, their average lifespan shortens
B. Poikilothermic animals complete their development history slower in warm areas than in cold areas
C. Endothermic animals cannot maintain a constant body temperature at low temperatures, while the body temperature of ectothermic animals increases with the increase of environmental temperature. And there are corresponding changes
D. Temperature is the limiting factor for animal distribution, and the most important thing is the regional average temperature
6. If the vole and giant salamander are moved from an environment of 25℃ to an environment of 5℃, the oxygen consumption of both will ( )
A. both decrease B. both increase
C. the former Decrease, the latter increases D. The former increases, the latter decreases
7. Which of the following does not belong to adventitious roots ( ).
A. Roots at the base of corn stems B. Roots on banyan branches
C. Roots on begonia leaves D. Roots that grow when peanut seeds germinate
8. The stem of a tree is 1m high. Make a mark 50cm from the ground. One year later, the stem of the tree will grow to 3m. At this time, the original mark is ( ) from the ground.
A.2.5 m B.0.5 m C.1.5 m D.3m
9. Which of the following types of plants has soft stems, underdeveloped mechanical tissues, and many Large intercellular spaces, fleshy leaves, and thin epidermis? ( )
A. Mesophytes B. Aquatic plants C. Xerophytes D. Thermophilic plants
10. Among the following statements about the formation process of angiosperm seeds and fruits, which one is correct ( )
A. The pollen that falls on the stigma germinates into pollen tubes, each pollen tube containing two sperm
B. The process in which a sperm and an egg cell are fertilized with two polar nuclei respectively is called double fertilization
C. After fertilization, the ovary develops into a fruit and the integument develops into a pericarp
D. After fertilization, the ovule develops into a seed, and the fertilized egg develops into the endosperm
11. Which of the following plants has metamorphosed leaves with the function of storing nutrients ( )
A. Potato B. Water chestnut C. Lotus root D. Narcissus
12. Which of the following groups of crops is suitable for cultivation in greenhouses? ( )
A. Pumpkin, cotton B. Rapeseed, leek C. Tomato, pepper D. Grape, pear
13. Cultivating and loosening the soil helps the growth of crops. The following reasons cannot be established: ( ).
A. Promote the absorption of inorganic salts by root cells B. Enhance the respiration of root cells
C. Promote the transport of inorganic salts in the plant D. Accelerate the arrival of inorganic salt ions into root cells Surface
14. When cultivating the following groups of crops, the group that should appropriately apply more potassium fertilizer is ( ).
A. Potato, potato B. Tomato, peanut C. Cabbage, rape D. Spinach, celery
15. The figure below shows the water absorption and transpiration rate of sunflowers within 24 hours. Based on the figure, infer which of the following is correct ( )
A. Under light, the absorption rate is always greater than the transpiration rate
B. Under light, the transpiration rate is always greater than the absorption rate
C. In the dark, the transpiration rate is always greater than the absorption rate
D . In the dark, the absorption rate is always greater than the transpiration rate
16. As shown in the figure, after the green plants originally placed in the dark environment were moved to the light, the amount of CO2 absorbed changed. Among the following statements, the correct one is ( )
A. The AB segment of the curve indicates that green plants do not perform photosynthesis
B. The BC segment of the curve indicates that green plants only perform photosynthesis< /p>
C. Point B shows that the photosynthesis and respiration rates of green plants are equal
D. The entire curve shows that as the light intensity increases, photosynthesis increases and respiration weakens
D. p>
17. Take two leaves (A and B) from the apple tree, apply Vaseline on the upper surface of A and the lower surface of B respectively, then tie the petioles with thin threads and hang them indoors. After a few days, it was found that leaf A shrank and leaf B basically remained in its original state.