The leafy stage of the gametophyte typically develops from a caulonema but, as shown by the diagram on the right, in some mosses leafy growth develops from the chloronema. Q1.How many nuclei are present in a fully developed male gametophyte of flowering plants? 13. ABO blood group system is an example of co-dominance. In this disease, the gene coding for enzyme ADA gets deleted leading to deficiency of ADA and problems in immune system. Protonema: Spores produced from the moss capsule germinate in favorable conditions. (iii) Base Complementarity Rule: A purine always pairs with a pyrimidine in a DNA molecule i.e. Development of gametophyte from sporophyte without the formation of spores is known as apospory. (c) Expand PCR. The latter is variable in form and has denser cytoplasm. It has a haploid nucleus. It is possible for a caulonema to give rise to fresh chloronema, as shown by a partially dotted-line chloronema in the diagram on the left. Inbreeding depression is the reduction in the fertility and productivity of an organism due to continuous inbreeding. Initially, 4 spores stay together as a tetrad, but they eventually separate and each develop into a pollen grain. Following is the labelled diagram of a male gametophyte of an angiosperm.Sporopollenin is considered to be the most resistant organic material because it is chemically very stable and it can withstand high temperatures, acidic and alkaline conditions, and enzymes. ... To alert consumers that it is ready to be eaten and the seeds are fully developed. ... which contain the male gametophyte. Sexual reproduction in such gametophores results in the formation of tetraploid (4n) zygote. 2. 2. Microspore mother cells. Explain. (iii) Explain the base complementarity rules. (b) Write the genotypes of both the parents who have produced a sickle celled anaemic offspring. The introduction of sewage caused a sudden and sharp drop in the amount of dissolved oxygen in the river. This video just gives an overview for revision purpose only. Best answer. At the matured stage, protonema has three parts. (i)The structure of a male gametophyte of an angiosperm is: (ii)Sporopollenin is one of the hardest or resistant organic material known. 1 Answer. Easy drawing of this item is shown in this video. (c) Rhizoid: The hairy filaments growing in a cluster from the underground part of the stem are known as rhizoids. Consider the following statements and choose the ones that … Draw labelled diagrams of a. Which one is surrounded by callose wall? Check you answers with answer keys provided. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. The cell enlarges and undergoes three free nuclear mitotic divisions. These buds later develop into leafy gametophores. The size of male gamete in Cycas varies from 180-210µm (largest, 400«m reported from Chigua, a cycad). (b) Genotypes of parents who have produced a sickle celled anaemic offspring can be either. The individual cells of the tetrad are released
(b) Gametophyte and sporophyte of Funaria. Free PDF download of Important Questions for CBSE Class 12 Biology Chapter 3 - Human Reproduction prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. As the sewage gets diluted due the flow of the water, the river slowly regains some of its oxygen concentration. Development of male gametophyte . © Following is the labelled diagram of a male gametophyte of an angiosperm.Sporopollenin is considered to be the most resistant organic material because it is chemically very stable and it can withstand high temperatures, acidic and alkaline conditions, and enzymes. How are dominance, co-dominance and incomplete dominance patterns of inheritance different from each other? Starts as adult gametophyte, then gametes combine to form sporophyte, another adult form. Spores germinate to form a filamentous, branched and algae-like plant, called protonema. There are two hydrogen bonds between adenine and thymine and three hydrogen bonds between guanine and cytosine. The cell enlarges and undergoes three free nuclear mitotic divisions. (b) Write the term given to (A) and (C) and why? Fertilization: The female gametophyte develops inside the ovule. The latter then serves an antheridial initial, forming a peripheral tube cell and an inner generative cell. To form four fully developed Polygonum type of embryosacs in angiosperms total number of meiosis and mitosis divisions generations required are :- 1. Draw a Labelled Diagram of Gametophyte of Moss, Explain Antheridium or Male Reproductive Organ of Moss, Identifying Characteristics of the Family Leguminosae. (c) PCR stands for Polymerase Chain Reaction. These male and female sex cells, also known as eggs and sperm, unite during fertilization to form a diploid zygote. F igure 3 A diagram of male and hermaphrodite gametophyte dev elopment in Ceratopteris. Figure 1 illustrates the subsequent events leading to the formation of a pollen grain. As the spore cracks, the spore cell divides asymmetrically , producing one lar ger basal cell and one Ans: After entering one of the synergids, the pollen tube release the two male gametes into the cytoplasm of the synergid. Q.9. Male gametogenesis begins with the division of a diploid sporophytic cell, giving rise to the tapetal initial and the sporogenous initial (pollen mother cell). No enzyme that degrades sporopollenin is so far known. Answer. Draw a neat labelled diagram of T.S of young anther. Download the PDF Sample Papers Free for off line practice and view the Solutions online. ... Q22.Draw a f low chart to show hormonal control of human male reproductive system,highlighting the Higher plants have a complex life cycle that alternates between the growth of a diploid sporophytic organism and a highly reduced haploid gametophytic form. Male gametophyte development in higher plants is a complex process that requires the coordinated participation of various cell and tissue types and their associated specific gene expression patterns. Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. Female and male thallus of a liverwort. Inside is a tiny, tiny plant. Gametophore: The part of the protonema developed erectly and enriched with leaves is known as gametophore protonema dies after the gametophore becomes fully developed. Male gametophyte development. (a) Sickle celled anaemia in humans is a result of point mutation. The various parts of an ovule are – (1) Funiculus – It is a stalk-like structure which represents the point of attachment of the ovule to the placenta of the ovary. The sporophyte stalk, called the seta, bears the spore capsule on its tip. The gametophyte refers to all organs and tissues that are a part of the haploid generation. The sporogenous cells undergo meiosis, giving rise to a tetrad of haploid cells. Delhi - 110058. The term gametophyte might refer to the gametophyte phase of the plant life cycle or to the exacting plant body or organ that produces gametes. 4, 12 2. Observation of Male and female is made using a hand-lens. They are slender, branched, and multicellular and have oblique septa. The female gametophyte (embryo sac) develops from a single functional megaspore. The haploid microspore (pollen) is the pioneer structure of the male gametophyte. Thus, a fully developed male- gametophyte consists of a disorganized prothallial cell, stalk cell, tube nucleus and 2 male gametes (Fig 9.13 ) Each male gamete appears top-shaped with 5-6 spiral bands of cilia. This is the reverse of the pattern seen in the nonvascular plant groups liverworts, mosses, and hornworts (the Bryophyta). To Examine Spermatophyta A mature twig of either cypress or pinus with cones is obtained. gametophyte and sporop… Get the answers you need, now! Q2.What ... Q21.Draw well labelled diagram of typical monocotyledons embryo. (a) Identify (A) and (B) illustrations in the following:i. ii. One nucleus moves towards the micropylar end while the other nucleus moves towards the chalazal end. Why is sporopollenin considered the most resistant organic material? 1.3k VIEWS. Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species. The germination of the pollen grain starts within the pollen sac( microsporangia). Gametophyte contains balls of unspecialized cells called gammae. (b) Leaf: Leaves are simple and spirally arranged in the stem. (a) Stem: It is slender flexible and branched or unbranched. (i) Give the base sequence of its complementary strand. Male and female gametophytes are the two gametophytic stages of heterosporous plants. The term gametophyte may refer to the gametophyte phase of the plant life cycle or to the particular plant body or organ that produces gametes. 1. It is in the haploid gametophyte structure that gametes are formed. The morphological complexity of the haploid generation ranges from the lower plant gametophytes which form the main plant body and support the much smaller sporophytes, to the highly reduced three-celled male gametophyte (pollen) and seven-celled female gametophyte (embryo sac) that are characteristic of most angiosperms. View solution. Solution: The diagram of a section of an ovary is as follows: 14. These villi penetrate the […] STUDY. The microspore starts germinating while it is still within the microsporangium or pollen sac. The first mitotic division in the megaspore forms two nuclei. Their stickiness of the ends facilitates the action of the enzyme DNA ligase. The term gametophyte might refer to the gametophyte phase of the plant life cycle or to the exacting plant body or organ that produces gametes. C are called the palindromic nucleotide sequence. Then, these nuclei divide at their respective ends … PCR is a technique used to synthesize multiple copies of the gene (or DNA) of interest in vitro using two sets of primers (small chemically synthesized oligonucleotides that are complementary to the regions of DNA) and the enzyme DNA polymerase. answered Apr 22, 2020 by Kavita01 (48.1k points) selected Apr 25, 2020 by Mukesh01 . Draw labelled diagrams of
(a) Female and male thallus of a liverwort. View solution. The exine ruptures near the … A gametophyte represents the sexual phase of the plant life. This in turn leads to the death of fishes and other aquatic life. For instance, most mosses have spirally … CBSE Class 12 Biology Solved Question Paper 2011, Class 11 NCERT Political Science Solutions, Class 11 NCERT Business Studies Solutions, Class 12 NCERT Political Science Solutions, Class 12 NCERT Business Studies Solutions, https://www.zigya.com/share/QklFTjEyMTExNDE2. Draw a well-labeled diagram of Polygonum type of embryo sac. Practice to excel and get familiar with the paper pattern and the type of questions. They arise from the base of the axis. It is eight nucleated, seven celled structure. It is extensively used in the process of gene manipulation. Explain Archegonium or Female Reproductive Organ of Moss, Identifying Characteristics of Sub-family Papilionoideae, Perseverance Spotted From Space As Tiny Speck On Martian Surface, UN Climate Report Reveals World Is “Nowhere Close” To Curbing The Climate Emergency, This Is How Slime Mold Makes Memories, Despite Having No Brain, Leucism Or Albinism? Two advantages of inbreeding are: (i) Superior quality of breed of organisms is obtained. they are rolled, or needle-like. It can withstand high temperatures, strong acids and alkalis. It has two parts sporophyte and gametophyte. A labelled drawing showing: frond, pinna, sorus, rhizome and adventitious roots.
(b) Gametophyte and sporophyte of Funaria. Free PDF download of Important Questions for CBSE Class 12 Biology Chapter 3 - Human Reproduction prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. As the sewage gets diluted due the flow of the water, the river slowly regains some of its oxygen concentration. Development of male gametophyte . © Following is the labelled diagram of a male gametophyte of an angiosperm.Sporopollenin is considered to be the most resistant organic material because it is chemically very stable and it can withstand high temperatures, acidic and alkaline conditions, and enzymes. How are dominance, co-dominance and incomplete dominance patterns of inheritance different from each other? Starts as adult gametophyte, then gametes combine to form sporophyte, another adult form. Spores germinate to form a filamentous, branched and algae-like plant, called protonema. There are two hydrogen bonds between adenine and thymine and three hydrogen bonds between guanine and cytosine. The cell enlarges and undergoes three free nuclear mitotic divisions. (b) Write the term given to (A) and (C) and why? Fertilization: The female gametophyte develops inside the ovule. The latter then serves an antheridial initial, forming a peripheral tube cell and an inner generative cell. To form four fully developed Polygonum type of embryosacs in angiosperms total number of meiosis and mitosis divisions generations required are :- 1. Draw a Labelled Diagram of Gametophyte of Moss, Explain Antheridium or Male Reproductive Organ of Moss, Identifying Characteristics of the Family Leguminosae. (c) PCR stands for Polymerase Chain Reaction. These male and female sex cells, also known as eggs and sperm, unite during fertilization to form a diploid zygote. F igure 3 A diagram of male and hermaphrodite gametophyte dev elopment in Ceratopteris. Figure 1 illustrates the subsequent events leading to the formation of a pollen grain. As the spore cracks, the spore cell divides asymmetrically , producing one lar ger basal cell and one Ans: After entering one of the synergids, the pollen tube release the two male gametes into the cytoplasm of the synergid. Q.9. Male gametogenesis begins with the division of a diploid sporophytic cell, giving rise to the tapetal initial and the sporogenous initial (pollen mother cell). No enzyme that degrades sporopollenin is so far known. Answer. Draw a neat labelled diagram of T.S of young anther. Download the PDF Sample Papers Free for off line practice and view the Solutions online. ... Q22.Draw a f low chart to show hormonal control of human male reproductive system,highlighting the Higher plants have a complex life cycle that alternates between the growth of a diploid sporophytic organism and a highly reduced haploid gametophytic form. Male gametophyte development in higher plants is a complex process that requires the coordinated participation of various cell and tissue types and their associated specific gene expression patterns. Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. Female and male thallus of a liverwort. Inside is a tiny, tiny plant. Gametophore: The part of the protonema developed erectly and enriched with leaves is known as gametophore protonema dies after the gametophore becomes fully developed. Male gametophyte development. (a) Sickle celled anaemia in humans is a result of point mutation. The various parts of an ovule are – (1) Funiculus – It is a stalk-like structure which represents the point of attachment of the ovule to the placenta of the ovary. The sporophyte stalk, called the seta, bears the spore capsule on its tip. The gametophyte refers to all organs and tissues that are a part of the haploid generation. The sporogenous cells undergo meiosis, giving rise to a tetrad of haploid cells. Delhi - 110058. The term gametophyte might refer to the gametophyte phase of the plant life cycle or to the exacting plant body or organ that produces gametes. 4, 12 2. Observation of Male and female is made using a hand-lens. They are slender, branched, and multicellular and have oblique septa. The female gametophyte (embryo sac) develops from a single functional megaspore. The haploid microspore (pollen) is the pioneer structure of the male gametophyte. Thus, a fully developed male- gametophyte consists of a disorganized prothallial cell, stalk cell, tube nucleus and 2 male gametes (Fig 9.13 ) Each male gamete appears top-shaped with 5-6 spiral bands of cilia. This is the reverse of the pattern seen in the nonvascular plant groups liverworts, mosses, and hornworts (the Bryophyta). To Examine Spermatophyta A mature twig of either cypress or pinus with cones is obtained. gametophyte and sporop… Get the answers you need, now! Q2.What ... Q21.Draw well labelled diagram of typical monocotyledons embryo. (a) Identify (A) and (B) illustrations in the following:i. ii. One nucleus moves towards the micropylar end while the other nucleus moves towards the chalazal end. Why is sporopollenin considered the most resistant organic material? 1.3k VIEWS. Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species. The germination of the pollen grain starts within the pollen sac( microsporangia). Gametophyte contains balls of unspecialized cells called gammae. (b) Leaf: Leaves are simple and spirally arranged in the stem. (a) Stem: It is slender flexible and branched or unbranched. (i) Give the base sequence of its complementary strand. Male and female gametophytes are the two gametophytic stages of heterosporous plants. The term gametophyte may refer to the gametophyte phase of the plant life cycle or to the particular plant body or organ that produces gametes. 1. It is in the haploid gametophyte structure that gametes are formed. The morphological complexity of the haploid generation ranges from the lower plant gametophytes which form the main plant body and support the much smaller sporophytes, to the highly reduced three-celled male gametophyte (pollen) and seven-celled female gametophyte (embryo sac) that are characteristic of most angiosperms. View solution. Solution: The diagram of a section of an ovary is as follows: 14. These villi penetrate the […] STUDY. The microspore starts germinating while it is still within the microsporangium or pollen sac. The first mitotic division in the megaspore forms two nuclei. Their stickiness of the ends facilitates the action of the enzyme DNA ligase. The term gametophyte might refer to the gametophyte phase of the plant life cycle or to the exacting plant body or organ that produces gametes. C are called the palindromic nucleotide sequence. Then, these nuclei divide at their respective ends … PCR is a technique used to synthesize multiple copies of the gene (or DNA) of interest in vitro using two sets of primers (small chemically synthesized oligonucleotides that are complementary to the regions of DNA) and the enzyme DNA polymerase. answered Apr 22, 2020 by Kavita01 (48.1k points) selected Apr 25, 2020 by Mukesh01 . Draw labelled diagrams of
(a) Female and male thallus of a liverwort. View solution. The exine ruptures near the … A gametophyte represents the sexual phase of the plant life. This in turn leads to the death of fishes and other aquatic life. For instance, most mosses have spirally … CBSE Class 12 Biology Solved Question Paper 2011, Class 11 NCERT Political Science Solutions, Class 11 NCERT Business Studies Solutions, Class 12 NCERT Political Science Solutions, Class 12 NCERT Business Studies Solutions, https://www.zigya.com/share/QklFTjEyMTExNDE2. Draw a well-labeled diagram of Polygonum type of embryo sac. Practice to excel and get familiar with the paper pattern and the type of questions. They arise from the base of the axis. It is eight nucleated, seven celled structure. It is extensively used in the process of gene manipulation. Explain Archegonium or Female Reproductive Organ of Moss, Identifying Characteristics of Sub-family Papilionoideae, Perseverance Spotted From Space As Tiny Speck On Martian Surface, UN Climate Report Reveals World Is “Nowhere Close” To Curbing The Climate Emergency, This Is How Slime Mold Makes Memories, Despite Having No Brain, Leucism Or Albinism? Two advantages of inbreeding are: (i) Superior quality of breed of organisms is obtained. they are rolled, or needle-like. It can withstand high temperatures, strong acids and alkalis. It has two parts sporophyte and gametophyte. A labelled drawing showing: frond, pinna, sorus, rhizome and adventitious roots.