12th Sexual reproduction in flowering plants short and long type Question

Sexual Reproduction in Flowering Plant Short type Questions Are Given here which are very important for Board Exam. Basically these Question are made for 12th Science Students. Here short type and long type question are given with their answer. So read the Question and Answer Carefully.

Question Carrying 2 Mark

Q1. Name two cells of a mature pollen grain?

 Ans: Vegetative cell and Generative cell 

Q2. What do you mean by parthenocarpy?

 Ans: Formation of fruit without fertilization is known as parthenocarpy. 

Q3. What are the different types of endosperm?

 Ans: Nuclear endosperm and Cellular endosperm 

Q4. What is meant by monosporic development of female gametophyte? 

Ans: The method of embryo sac formation from single megaspore is called monosporic development. 

Q5. What are cleistogamous flowers?

 Ans: The flower which are always closed and shows autogamy is known as cleistogamous flower. 

Q6. Name the parts of angiospermic flowers in which development of male and female gametophyte takes place.

 Ans: Anther and Ovary 

Q7. What do you mean by monoecious and dioecious plants? 

Ans: Plants that have both male and female sex organs or flowers are called monoecious plant whereas a dioecious plants have either male or female sex organ.

 Q8. Differentiate between hypocotyl and epicotyl.

 Ans: The part of embryonal axis below the cotyledon is known as hypocotyl whereas the part of embryonal axis above the cotyledon is known as epicotyl.

 Q9. Why apple is called a false fruit?

 Ans: Apple is a false fruit because thalamus develops into fruit here ,not the ovary.

 Q10. What is seed dormancy? 

Ans: Seed dormancy is a state in which seeds are prevented from germinating even in favourable environmental condition.

Question Carrying 3 Mark

Q2. What is triple fusion? Name the nuclei involved in triple fusion.

 Ans: Fusion of male gamete with diploid secondary nucleus to form triploid primary endosperm nucleus is known as triple fusion. In triple fusion two polar nuclei and one male gamete are involved. 

Q3. Mention three strategies evolved to prevent self-pollination in flowers. 

Ans: 1. Dichogamy: stigma and anther mature at different times. 2. Heterostyly: stigma and anther are placed at different levels. 3. self-incompilibility

 Q4. What do you mean by double fertilization? 

Ans: The process of fusion of one male gamete with egg to form diploid zygote and another male gamete with the polar nuclei or secondary nucleus to form primary endosperm nucleus is called double fertilization.

 Q5. Differentiate between microsporogenesis and megasporogenesis.

 Ans: Microsporogenesis Megasporogenesis It is the formation of haploid microspores from the diploid microspore mother cell. It is the formation of haploid megaspore from the diploid megaspore mother cell. The microspores are arranged in tetrahedral tetrad. The megaspores are arranged in linear tetrad. All the microspores are functional. Only one megaspore is functional.

Sexual Reproduction in Flowering Plant Long Type Question

Q2. What do you mean by pollination? Explain the different types of pollination. 

Ans: The transfer of pollen grains from anther to stigma of a pistil is called pollination. Types of pollination: 1. Autogamy: Transfer of pollen grains from anther to stigma of the same flower. E.g viola,oxalis 2. Geitonogamy: Transfer of pollen grain from the anther to the stigma of another flower of the same plant. E.g cucurbits 3. Xenogamy: Transfer of pollen grains from anther to the stigma of another flower of the different plant. E.g papaya 

Q3. Explain the process of microsporogenesis in angiosperm. 

Ans: The process of formation of haploid microspores from a pollen mother cell (PMC) or microspore mother cell through meiosis is called Microsporogenesis. When the anther develops, each cell of sporogenous tissue functions as microspore mother cell (MMC) which undergoes meiotic divisions to form four haploid microspores . The microspores get arranged in a cluster of four cells which is known as microspore tetrads. As the anther matures and dehydrates, the microspores dissociate from each other and develop into pollen grains.

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