biology-class-12-unit-03-chapter-04-reproduction-sexual-reproductionin-flowering-plants-l-4-5-ej9hyhdez84

### <Success style="font-size:25px"> Reproduction Sexual Reproductionin Flowering Plants L-4 </Success>
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- **Question 1** What is Chasmogamous flower ?

- **Answer** Exposed anther and stigma (Cross Pollination)

- **Question 2** Is cross pollination possible in chasmogamous flower What is Cleistogamous ?

- **Answer** Cross-pollination cannot occur in cleistogamous flowers because they never open Cleistogamous flowers are the ones that do not open and show self-pollination. Example- _Oxalis_

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<footer style = "font-size: 18px"> $\rightarrow$ Sexual reproduction in flowering plants (Part 4) $\rightarrow$ <span style = "color:blue"> Solving of previous questions </span> $\rightarrow$ Solving of previous questions $\rightarrow$ Solving of previous questions </footer>

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- **Question 3** Mention two strategies which are being involved to prevent the self pollination ?

- **1. Herkogamy**

- Mechanical Barrier 
- Gynostegium 
- Pollinia

- **2. Dichogamy** 
- Developments of anther and stigma on different times

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<footer style = "font-size: 18px">Sexual reproduction in flowering plants (Part 4) $\rightarrow$ Solving of previous questions $\rightarrow$ <span style = "color:blue"> Solving of previous questions </span> $\rightarrow$ Solving of previous questions $\rightarrow$ Solving of previous questions </footer>

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- **Question 4** **What is meant by emasculation?**

- Answer- Removal of anthers or destroying of pollen grains

- **Question 5 What is bagging technique? How it is useful in plant breeding programme?**

- Answer- Removal of anthers or destroying of pollen grains
 
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- **Question 6 What is self-incompatibility? Why does self pollination not lead to the seed formation in self-incompatible species?**

- **Answer** 
- It is a type of reproductive barrier
- The plant's stigma can recognize and reject its own pollen or pollen from genetically similar plants
- This rejection prevents the pollen from successfully fertilizing the ovules by inhibiting pollen germination on the stigma

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- **Stages of self-incompatibility**

- 1. Germination of Pollen tube

- 2. Inability to Penetrate Stigma

- 3. No growth of Pollen tube

- 4. Reach to ovary

- 5. No fusion of male and female gametes

- 6. Embryo may get aborted

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- **1. Phase 1**

* Pre-Pollination Pollen grain are store in anther or pollen sac

- **2. Phase 2**

* Post-Pollination Pollen grain fall on stigma $\rightarrow$ male gametophyte

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<footer style = "font-size: 18px">Solving of previous questions $\rightarrow$ Solving of previous questions $\rightarrow$ <span style = "color:blue"> Development of male gametophyte </span> $\rightarrow$ Female sex organ (Carpel) $\rightarrow$ Different types of ovule </footer>

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- Stigma

- Style

- Ovary

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