BOTANY Q&A ASKED FROM 2013 TO 2019 TNPSC EXAMS BY SURESH IAS ACADEMY - DAILY JOB ALERT FOR FREEE

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Saturday, June 6, 2020

BOTANY Q&A ASKED FROM 2013 TO 2019 TNPSC EXAMS BY SURESH IAS ACADEMY


For this TNPSC exam, the question book bank is taken from the previous year question papers from the year 2013 to 2019.the questions which we are given you are given by SURESH IAS ACADEMY. these questions are free from cost. these questions are only botany question, for this TNPSC exams.

Make use of these notes in a useful manner so that you can clear the exam in a successful manner. Day _by_day if you practice these questions it is more than enough you to clear the exam. Have patience and work hard. The candidate should follow the entire book bank question throughout. these questions are the best reference for this TNPSC exam.

 I would suggest you learn these questions and answers that are given by SURESH IAS ACADEMY. these questions and answers were attached in a single PDF. In this post we have shared botany questions and answer for the year 2013 to 2019 .make use of it .if you feel these questions and answers were helpful for you to share with your friends and family circles.so that your friends may also feel somewhat easy to clear the exams.so concentrate on these questions for your easy reference.

IMPORTANT POINTS FOR EXAMS

Asexual and Sexual Reproduction in Plants

Th e-learner will be able to Recall various types of reproduction in lower and higher organisms. Discuss different methods of vegetative reproduction in plants. Recognize modern methods of reproduction. Recall the parts of a flower. Recognize the structure of mature anther. Describe the structure and types of ovules. Discuss the structure of the embryo sac. Recognize different types of pollination. Identify the types of endosperms. Diff eventuate the structure of Dicot and Monocot seed.

One of the essential features of all living things on earth is reproduction.   Plant reproduction is important not only for its own survival but also for the continuation and existence of all other organisms since the latter directly or indirectly depend on plants. 

Reproduction also plays an important role in evolution. 

 1682 - Nehemiah Grew mentioned stamens as the male organ of an fl power. 
1824 - G.B.Amici discovered the pollen tube. 
1848 - Hofmeister described the structure of pollen tetrad
1878 - E.Strasburger reported polyembryony 
1884 - E.Strasburger discovered the process of Syngamy.
 1898 - S.G.Nawaschin and L. Guignard independently discovered Double fertilization 
1904 – E.Hanning initiated embryo culture. 
1950 - D.A. Johansen proposed classification for embryo development
1964 - S.Guha and S.C.Maheswari raised
haploids from Datura pollen grains
1991 - E.S.Coen and E. M. Meyerowitz
proposed the ABC model to describe the
genetics of initiation and development
of floral parts
2015 - K.V.Krishnamurthy summarized the
molecular aspects of pre and post
fertilization reproductive development
in flowering plants

Basically, reproduction occurring in
organisms fall under two major categories
1. Asexual reproduction
2. Sexual reproduction.

1.1 Asexual Reproduction The reproduction method which helps to perpetuate its own species without the involvement of gametes is referred to as asexual reproduction. From Unit I of Class XI we know that reproduction is one of the attributes of living things and the different types of reproduction have also been discussed. Lower plants, fungi, and animals show different methods of asexual reproduction. Some of the methods include the formation of Conidia (Aspergillus and Penicillium); Budding (Yeast and Hydra); Fragmentation (Spirogyra); production of Gemma (Marchantia); Regeneration (Planaria) and Binary fission (Bacteria) (Refer chapter 1 of Unit I of class XI). The individuals formed by this method are morphologically and genetically identical and are called clones. Higher plants also reproduce asexually by different methods which are given below:


1.2 Vegetative reproduction 

1.2.1 Natural methods Natural vegetative reproduction is a form of asexual reproduction in which a bud grows and develops into a new plant. The buds may be formed in organs such as root, stem, and leaf. At some stage, the new plant gets detached from the parent plant and starts to develop into a new plant.  The unit of reproductive structure used in propagation is called reproductive propagules or diaspores. Some of the organs that help in vegetative reproduction are given in Figure 1.1.

 Examples Murraya, Dalbergia, and Millington. Some tuberous adventitious roots apart from developing buds also store food. Example Ipomoea matatus and Dahlia. Roots possessing buds to become detached from the parent plant and grow into independent plants under suitable conditions.

BOTANY Q&A ASKED FROM 2013 TO 2019 TNPSC EXAMS BY  SURESH IAS ACADEMY-DOWNLOAD


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