🧬Biology with Heera👩⚕
*ೃ༄The Formation of Pollen Grains in an Anther 🌺🌾
➣Occurs in the anther
➣In the anther, there are four pollen sacs on each lobe
➣In each pollen sac, there are hundreds of pollen mother cell called microspore mother cell which are diploid (2n)
➣The microspore mother cell divides by meiosis to produce 4 haploid (n) microspore cells. They are known as tetrad.
➣Each microspore cell undergo mitosis to become pollen grains.
➣The nucleus in the pollen grain divides by mitosis and produce 2 nuclei, namely the generative nucleus and tube nucleus.
꘎♡━━━━━━━━━━━━━━━♡꘎
✅Total : 8 marks
#biology #c6 #f5
#heera
🦋*ੈ✩‧₊˚ 『 @serenenotes 』
*ೃ༄The Formation of Pollen Grains in an Anther 🌺🌾
➣Occurs in the anther
➣In the anther, there are four pollen sacs on each lobe
➣In each pollen sac, there are hundreds of pollen mother cell called microspore mother cell which are diploid (2n)
➣The microspore mother cell divides by meiosis to produce 4 haploid (n) microspore cells. They are known as tetrad.
➣Each microspore cell undergo mitosis to become pollen grains.
➣The nucleus in the pollen grain divides by mitosis and produce 2 nuclei, namely the generative nucleus and tube nucleus.
꘎♡━━━━━━━━━━━━━━━♡꘎
✅Total : 8 marks
#biology #c6 #f5
#heera
🦋*ੈ✩‧₊˚ 『 @serenenotes 』
❤6
🧬Biology with Heera👩⚕
༊*·˚How does POLLINATION occur ?🐝🪰🌼🌬
⚡️Pollination occurs when the wall of anther is dry, and it shrinks and split
⚡️This causes pollen grain from pollen sac to release.
⚡️The pollen grain is transferred to stigma by pollinating agents such as insects, wind and animal.
⚡️The pollen grains stick to the glucose in the stigma.
⚡️The glucose molecules then stimulate the germination of pollen grains.
⚡️It will form a pollen tube.
⚡️The pollen tube grows down towards the ovule through the style.
⚡️The generative nucleus will move along the pollen tube towards the ovule and divide by mitosis to form 2 male gametes (n).
⚡️End of pollen tube secrete enzyme to digest the tissues of style.
⚡️Upon reaching embryo sac, pollen tube penetrate the ovule through micropyle.
⚡️Tube nucleus degenerate. Both male gamete enter the embryo sac.
꘎♡━━━━━━━━━━━━━━━━♡꘎
#biology #c6 #f5
#heera
🦋*ੈ✩‧₊˚ 『 @serenenotes 』
༊*·˚How does POLLINATION occur ?🐝🪰🌼🌬
⚡️Pollination occurs when the wall of anther is dry, and it shrinks and split
⚡️This causes pollen grain from pollen sac to release.
⚡️The pollen grain is transferred to stigma by pollinating agents such as insects, wind and animal.
⚡️The pollen grains stick to the glucose in the stigma.
⚡️The glucose molecules then stimulate the germination of pollen grains.
⚡️It will form a pollen tube.
⚡️The pollen tube grows down towards the ovule through the style.
⚡️The generative nucleus will move along the pollen tube towards the ovule and divide by mitosis to form 2 male gametes (n).
⚡️End of pollen tube secrete enzyme to digest the tissues of style.
⚡️Upon reaching embryo sac, pollen tube penetrate the ovule through micropyle.
⚡️Tube nucleus degenerate. Both male gamete enter the embryo sac.
꘎♡━━━━━━━━━━━━━━━━♡꘎
#biology #c6 #f5
#heera
🦋*ੈ✩‧₊˚ 『 @serenenotes 』
👍2🤩2
I will share the process of double fertilisation later inshaAllah💗
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🔥13❤6
🧬Biology with Heera👩⚕
➣Double Fertilisation
🌸Diploid ZYGOTE (2n)
🌸Triploid ENDOSPERM NUCLEUS (3n)
#biology #c6 #f5
#heera
*ೃ༄@biologyspmnotes
🦋*ੈ✩‧₊˚ 『 @serenenotes 』
➣Double Fertilisation
🌸Diploid ZYGOTE (2n)
🌸Triploid ENDOSPERM NUCLEUS (3n)
#biology #c6 #f5
#heera
*ೃ༄@biologyspmnotes
🦋*ੈ✩‧₊˚ 『 @serenenotes 』
Double Fertilisation (BioWH).pdf
329.9 KB
🧬Biology with Heera👩⚕
➣Double Fertilisation
🌸Diploid ZYGOTE (2n)
🌸Triploid ENDOSPERM NUCLEUS (3n)
(PDF)
#biology #c6 #f5
#heera
*ೃ༄@biologyspmnotes
🦋*ੈ✩‧₊˚ 『 @heeranotes 』
➣Double Fertilisation
🌸Diploid ZYGOTE (2n)
🌸Triploid ENDOSPERM NUCLEUS (3n)
(PDF)
#biology #c6 #f5
#heera
*ೃ༄@biologyspmnotes
🦋*ੈ✩‧₊˚ 『 @heeranotes 』
👍1