Bài 69. Ôn tập: Môi trường và tài nguyên thiên nhiên
<h3 style="text-align: justify;" id="trograve-choi-hoc-tap-ldquodoaacuten-churdquo">Trò chơi học tập: “Đoán chữ”.</h3> <p style="text-align: justify;">Tìm các chữ cái cho các ô trống dưới đây để khi ghép lại phù hợp với từng nội dung sau:</p> <p style="text-align: justify;">Dòng 1: Tính chất của đất đã bị xói mòn.</p> <p style="text-align: justify;">Dòng 2: Đồi cây đã bị đốn hoặc đốt trụi.</p> <p style="text-align: justify;">Dòng 3: Là môi trường sống của nhiều loài động vật hoang dã, quý hiếm; nếu bị tàn phá sẽ làm khí hậu bị thay đổi, lũ lụt, hạn hán xảy ra thường xuyên.</p> <p style="text-align: justify;">Dòng 4: của cải có sẵn trong môi trường tự nhiên mà con người sử dụng.</p><div class="google-auto-placed ap_container" style="width: 100%; height: auto; clear: both; text-align: center;"><ins data-ad-format="auto" class="adsbygoogle adsbygoogle-noablate" data-ad-client="ca-pub-8123786206223951" data-adsbygoogle-status="done" style="display: block; margin: auto; background-color: transparent; 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</div><p></p> <h3 style="text-align: justify;" id="liecircn-he-thuc-te-vagrave-tra-loi">Liên hệ thực tế và trả lời</h3> <p style="text-align: justify;">Hãy chọn câu trả lời đúng cho các câu hỏi sau:</p> <p style="text-align: justify;">1.Điều gì sẽ xảy ra khi có quá nhiều khói, khí độc thải vào không khí?</p> <p style="text-align: justify;">a) Không khí trở nên nặng hơn.</p> <p style="text-align: justify;">b) Không khí bị ô nhiễm.</p> <p style="text-align: justify;">c)Không khí chuyển động.</p> <p style="text-align: justify;">d) Không khí bay cao.</p> <p style="text-align: justify;">2.Yếu tố nào được nêu ra dưới đây có thể làm ô nhiễm nước?</p> <p style="text-align: justify;">a) Không khí.</p> <p style="text-align: justify;">b) Nhiệt độ.</p> <p style="text-align: justify;">c) Chất thải.</p> <p style="text-align: justify;">d) Ánh sáng mặt trời.</p> <p style="text-align: justify;">3.Trong các biện pháp làm tăng sản lượng lương thực trên diện tích đất canh tác, biện pháp nào sẽ làm ô nhiễm môi trường đất?</p> <p style="text-align: justify;">a) Tăng cường làm thuỷ lợi.</p> <p style="text-align: justify;">b) Chọn giống tốt.</p> <p style="text-align: justify;">c) Tăng cường dùng phân hoá học và thuốc trừ sâu.</p> <p style="text-align: justify;">d) Tăng cường mối quan hệ giữa cây lúa, các sinh vật tiêu diệt sâu hại lúa với sâu hại lúa.</p> <p style="text-align: justify;">4.Theo bạn, đặc điểm nào là quan trọng nhất của nước sạch?</p> <p style="text-align: justify;">a) Dễ uống.</p> <p style="text-align: justify;">b) Giúp nấu ăn ngon.</p> <p style="text-align: justify;">c) Giúp phòng tránh được các bệnh về đường tiêu hoá, bệnh ngoài da, đau mắt,...</p> <p style="text-align: justify;">d) Không mùi và không vị.</p>