下圖是某興趣小組在探究綠色植物光合作用過程中的實(shí)驗(yàn)設(shè)計：

請據(jù)圖分析回答：
（1）根據(jù)以上實(shí)驗(yàn)設(shè)計分析，甲、乙是一組          實(shí)驗(yàn)，實(shí)驗(yàn)變量是             。
（2）請比較甲、乙裝置中蠟燭燃燒時間的長短：                                  ，產(chǎn)生該結(jié)果的原因是                                      。
（3）以上實(shí)驗(yàn)最好重復(fù)多次，目的是                            。
（4）實(shí)驗(yàn)時，如果乙裝置用黑布罩住，與之前沒有用黑布罩住的相比較，蠟燭燃燒時間將            （選填“延長”、“不變”或“縮短”），原因是                       。
（5）根據(jù)以上的實(shí)驗(yàn)探究，寫一條提高大棚農(nóng)作物產(chǎn)量的措施                      。
（1）對照 綠色植物
（2）乙比甲長 乙中綠色植物光合作用釋放氧氣
（3）避免實(shí)驗(yàn)結(jié)果的偶然性（其他答案均可）
（4）縮短 沒有光照綠色植物不能進(jìn)行光合作用，無氧氣釋放
（5）延長光照時間（或 “增加二氧化碳濃度” “合理密植”等）解析:
光合作用會釋放出氧氣，供蠟燭的燃燒，為了使實(shí)驗(yàn)有說服力，實(shí)驗(yàn)中一定要設(shè)置對照組。在設(shè)計對照實(shí)驗(yàn)時，要遵循單一變量的原則。實(shí)驗(yàn)常常要重復(fù)多次，才能得到比較可靠的結(jié)果。黑布罩住。植物不能進(jìn)行光合作用，就不能釋放出氧氣。所以蠟燭會很快的熄滅。
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