bài 14:Thân to ra do đâu?

BAI 14: THAN DAI RA DO BAI 14: THAN DAI RA DO DAU? DAU? GIAO VIEN: LE BOI NGOC GIAO VIEN: LE BOI NGOC HOC SINH:TRAN THI MINH NGOC HOC SINH:TRAN THI MINH NGOC PHAN 1:SU DAI RA CUA THAN PHAN 1:SU DAI RA CUA THAN • -Gieo hat dau vao khay co cat am cho den khi -Gieo hat dau vao khay co cat am cho den khi cay ra la that thu nhat. cay ra la that thu nhat. • -Chon 6 cay dau cao bang nhau.Ngat ngon 3 -Chon 6 cay dau cao bang nhau.Ngat ngon 3 cay(ngat tu doan co 2 la that) cay(ngat tu doan co 2 la that) • -Sau 3 ngay do lai chieu cao cua 3 cay ngat -Sau 3 ngay do lai chieu cao cua 3 cay ngat ngon va 3 cay khong ngat ngon.Tinh chieu cao ngon va 3 cay khong ngat ngon.Tinh chieu cao binh quan cua moi nhom. binh quan cua moi nhom. Phan lam bai: Phan lam bai: • Ghi ket qua da do Ghi ket qua da do duoc vao bang duoi duoc vao bang duoi day: day: Nhom cay Nhom cay Chieu Chieu cao(cm) cao(cm) Ngat ngon Ngat ngon Khong ngat Khong ngat ngon ngon Hinh: Hinh: • Dau : Dau : Phan thao luan: Phan thao luan: • -So sanh chieu cao cua hai nhom cay trong thi -So sanh chieu cao cua hai nhom cay trong thi nghiem:ngat ngon va khong ngat ngon. nghiem:ngat ngon va khong ngat ngon. • -Tu thi nghiem tren, hay cho biet than cay dai ra -Tu thi nghiem tren, hay cho biet than cay dai ra do bo phan nao? do bo phan nao? • -*Xem lai bai 8”Su lon len va phan chia te bao -*Xem lai bai 8”Su lon len va phan chia te bao “,giai thich vi sao than dai ra duoc? “,giai thich vi sao than dai ra duoc? Phan nen biet: Phan nen biet: • +Su dai ra cua than cac loai cay khac nhau thi +Su dai ra cua than cac loai cay khac nhau thi khong giong nhau: khong giong nhau: • -Cay than go lon cham hon, nhung song lau nam -Cay than go lon cham hon, nhung song lau nam nen nhieu cay cao, to nhu bach dan, cho, lim,… nen nhieu cay cao, to nhu bach dan, cho, lim,… • -Cay truong thanh khi bam ngon se phat trien -Cay truong thanh khi bam ngon se phat trien nhieu choi, hoa, qua, con khi tia canh cay tap nhieu choi, hoa, qua, con khi tia canh cay tap trung phat trien chieu cao. trung phat trien chieu cao. Phan 2:Giai thich nhung hien Phan 2:Giai thich nhung hien truong thuc te: truong thuc te: • -Khi trong dau, bong, ca phe, truong khi cay ra -Khi trong dau, bong, ca phe, truong khi cay ra hoa, tao qua, nguoi ta thuong ngat ngon. hoa, tao qua, nguoi ta thuong ngat ngon. • -Trong cay lay go (bach dan, lim), lay soi(gai, -Trong cay lay go (bach dan, lim), lay soi(gai, day), nguoi ta thuong tia canh xau, canh bi sau day), nguoi ta thuong tia canh xau, canh bi sau ma khong bam ngon. ma khong bam ngon. Cau hoi: Cau hoi: • Hay giai thich vi sao nguoi ta lai lam nhu the? Hay giai thich vi sao nguoi ta lai lam nhu the?    Bai tap: Bai tap: • Than dai ra do: Than dai ra do: • Su lon len va phan Su lon len va phan chia te bao chia te bao • Choi ngon Choi ngon • Mo phan sinh ngon Mo phan sinh ngon • Su phan chia te bao o Su phan chia te bao o mo phan sinh ngon. mo phan sinh ngon. Phan ghi nho: Phan ghi nho: • Than cay dai ra do su phan chia te bao o mo Than cay dai ra do su phan chia te bao o mo phan sinh ngon. phan sinh ngon. • De tang nang suat cay trong, tuy tung loai cay De tang nang suat cay trong, tuy tung loai cay ma bam ngon hoac tia canh vao nhung giai doan ma bam ngon hoac tia canh vao nhung giai doan thich hop. thich hop. [...]...Cau hoi: • Hay danh dau x vao nhung cay co than dai ra • • • • • nhanh: A)Mong toi d)Dau van b)Muop e)Tre c)Oi g)Mit h)Bi i)Nhan k)Bach dan Cau hoi: • Hay danh dau x vao nhung cay khi trongduoc • • • ngat ngon de cho thu hoach cao: A)Mong toi d)Dua B)Rau muong e)Che C)Rau day . DAI RA DO BAI 14: THAN DAI RA DO DAU? DAU? GIAO VIEN: LE BOI NGOC GIAO VIEN: LE BOI NGOC HOC SINH:TRAN THI MINH NGOC HOC SINH:TRAN THI MINH NGOC PHAN 1:SU DAI RA CUA THAN PHAN 1:SU DAI RA. thu hoach cao: ngat ngon de cho thu hoach cao: • A)Mong toi d)Dua A)Mong toi d)Dua • B)Rau muong e)Che B)Rau muong e)Che • C)Rau day C)Rau day . ngat ngon. • -Tu thi nghiem tren, hay cho biet than cay dai ra -Tu thi nghiem tren, hay cho biet than cay dai ra do bo phan nao? do bo phan nao? • -*Xem lai bai 8”Su lon len va phan chia te