問題詳情
48. 某一地區地上有高密度的一種樹木幼苗，在其生長成熟的過程中，數目逐漸減少且留下的成熟樹木成均勻分布。試問造成這種結果的原因可能為何？
(A) 蟲害
(B) 種內競爭
(C) 氣候的改變
(D) 土壤養份含量不均
(A) 蟲害
(B) 種內競爭
(C) 氣候的改變
(D) 土壤養份含量不均
參考答案
答案：B
難度：簡單0.882353
統計：A(0),B(30),C(2),D(2),E(0)
內容推薦
- 虎鉗規格以下列何者表示之？(A)虎鉗重量(B)鉗口寬度(C)虎鉗材質(D)虎鉗高度
- About mitosis and meiosis, which statement is NOT TRUE?(A) Mitosis conserves the number of chrom
- 高速鋼刀具的赤熱溫度可達攝氏多少度？(A) 400(B) 600(C) 800(D)1000
- Phylogenetic trees are best described as ____.(A) true and inerrant statements about evolutionar
- 下列哪一種材料常用於製作螺絲起子等各式工具？(A)低碳鋼(B)鑄鐵(C)純鋁(D)高碳鋼
- 有關管內流體壓力，下列何者不是影響其壓力下降的主因？(A)傳輸距離近(B)管內摩擦偏大(C)管徑大小變化高(D)彎管之曲率半徑太小
- 土壤真菌產生可以抑制某些細菌生長的化學物質，如抗生素 cycloheximide，其主要是抑制下列那一項？(A) 形成孢子 (B) DNA 的複製 (C) 正常細胞壁的形成 (D)
- 平板凸輪對，其從動件靜止不動期間，所對應的凸輪輪廓曲線應爲什麼形狀？(A)圓形(B)漸開線形(C)橢圓形(D)直線形
- What is the function of DNA polymerase III?(A) to rejoin the two DNA strands (one new and one ol
- 一般若要測量一公差爲±0.05mm的車床製階級零件，採用下列何種量具較爲適宜？(A)分厘卡(B)鋼尺(C)游標卡尺(D)三次元測量儀
內容推薦
- 滲氮法爲表面硬化法，其採用鋼料的主要合金元素爲哪些？(A) Al. Cr. Mo(B) Cr、W、V(C) Si、Mn、Ni(D)Ni、Cr、W
- 在CNS規範中，公制三角螺紋的規格可分爲哪兩種？(A)粗牙與特細牙(B)粗牙與特粗牙 (C)粗牙與細牙(D)細牙與特細牙
- 下列何者是生物放大效應(biological magnification)的結果？(A) 溫室效應在南北極最明顯(B) 許多養分已自農業用地中被移走且進入水域生態系中(C) 某一種殺蟲劑已散佈
- As cleavage continues during frog development, the size of the blastomeres ____.(A) increases as
- 使用皮帶傳動時，皮帶與帶輪的接觸角通常不得小於多少度，以避免打滑？(A) 180°(B) 150°(C) 120°(D)90°
- 使用精密車床做兩頂心間之車削工作，一般採用哪種工具牽引工件旋轉？(A)彈簧套筒(B)三爪連動夾頭(C)雞心夾頭(D)四爪單動夾頭
- Which of the following is true of members of the phylum Cnidaria?(A) They are not capable of loc
- How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cells
- 當農夫燒掉森林後，快速生長的雜草佔據這個區域，我們會認為這些雜草是________？(A) 受到 r-selection 篩選出來的物種 (B) 受到 K-selection 篩選出來的物種(
- 砂輪粒度大小是砂輪磨削能力的重要指標，請問哪一種粒度大小之磨削能力最大？(A)粗粒(B)中粒(C)細粒(D)粉狀
- The first cloned cat, called Carbon Copy, was a calico, but she looked significantly different f
- The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers a
- 使用靈敏鑽床鑽孔，當手一施壓力鑽削時，鑽床主軸即停止旋轉，其最有可能的原因爲何？(A)鑽頭夾太緊(B)鑽床電源線接反(C)塔輪皮帶太緊(D)塔輪皮帶太鬆
- Which of the following best describes resource partitioning?(A) Two species can coevolve to shar
- 根據國際標準(ISO)的車刀刀片代碼，其材質可分爲K、P、M、N、S、H等六大類，請問最適宜車削硬化材料 的是哪一類車刀？(A)K(B)M(C)S(D)H
- 假設輸入軸是等角速度運動，經由下列何者傳動之後，其輸出軸呈間歇運動？ (A)歐丹聯結器(B)日內瓦機構(C)萬向接頭(D)汽車減速機
- Which of the following statements about intermediate filaments is NOT TRUE?(A) They are cytoskel
- What is a karyotype?(A) The combination of chromosomes found in a gamete.(B) A system of classif
- —般灰鑄鐵中內含什麼物質，可以促進切削時之潤滑效果？(A)石墨(B)鋁(C)矽(D)硫
- 發光二極體是一種能發光的半導體電子元件，其省電能力遠勝於電燈泡，其英文名之簡稱是什麼？(A)1C(B)CNC(C)LCD(D)LED
- The leading and the lagging strands differ in that(A) synthesize leading strands require RNA pri
- Which of the following statements about glycolysis is NOT TRUE?(A) Glycolysis takes place in cyt
- The producers in aquatic ecosystems include organisms in which of the following groups?(A) photo
- Which of the following pair of hormones have antagonistic effects?(A) thyroid hormone and parath
- About split gene and RNA splicing, which of the following statements is NOT TRUE?(A) The coding