Bài 53. Cây non mọc lên từ hạt
<h3 style="text-align: justify;" id="thuc-hagravenh">Thực hành</h3> <p style="text-align: justify;">Có rất nhiều cây mọc lên từ hạt, nhưng bạn có biết nhờ đâu mà mọc thành cây không?</p> <p style="text-align: justify;">1.Đặt một số hạt lạc (hoặc đậu xanh, đậu đen,...) vào bông ẩm (hoặc giấy thấm hay đất ẩm) khoảng ba, bốn ngày, cẩn thận tách hạt ra làm đôi. Hãy chỉ đâu là vỏ, phôi, chất dinh dưỡng của hạt.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/53a-1665768728.PNG.webp" width="293" height="326" alt="hinh-anh-bai-53-cay-non-moc-len-tu-hat-1550-0" title="hinh-anh-bai-53-cay-non-moc-len-tu-hat-1550-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <p style="text-align: justify;">2.Mỗi thông tin trong khung chữ dưới đây ứng với hình nào?</p> <p style="text-align: justify;">a) Xung quanh rễ mầm mọc ra nhiều rễ con.</p> <p style="text-align: justify;">b) Hạt phình lên vì hút nước, vỏ hạt nứt để rễ mầm nhú ra cắm xuống đất.</p> <p style="text-align: justify;">c) Hai lá mầm xoè ra. 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Theo dõi thường xuyên từ lúc hạt nảy mầm cho đến khi mọc thành cây con.</p>