Free Essay

Describe the Process of Fertilisation and Seed Development in Flowering Plants [10]

In:

Submitted By nifie106
Words 336
Pages 2
Pollen grain are produced by the anther in meiosis, most pollen grains contain a single vegetative (non-reproductive cell) and a generative cell. The generative cell contains two nuclei, a generative nucleus and a tube nucleus. The generative nucleus divides to form the male gametes while the tube nucleus forms the pollen tube. The wall of pollen grain has two layers, the inner intine which is made of cellulose and the outer exine, which is a tough layer which prevents dying out. Increasing the chance of survival for the movement from anther to stigma of another flower. Once mature and ready to be released, the anther dries out and splits open along its lines of weakness (dehiscence), the pollen grains are now exposed to the environment and can be picked up by e.g. insects. The ovary of a female plant produces the ovule, in the ovule is the egg cell nucleus which is fertilised by the male nucleus.
Process: Pollination occurs when the pollen grain from a flower of one species lands on the stigma of a flower of the same species, the pollen grain then takes water in and germinates. The tube nucleus then begins to form the pollen tube. Enzymes in the pollen tube digest the way through the style. Within the pollen tube is the nucleus from the pollen grain (generative). The pollen tube enters the embryo sac through the micropyle which is a small whole in the base of the ovule. The generative nucleus enters the ovule and fertilisation then occurs, the haploid generative male nucleus fuses with the haploid female nucleus to give a diploid zygote. The seed and fruit then develop, the zygote becomes an embryo, containing plumule and a radicle. The integuments form the testa or seed coat. The whole ovule forms the seed while the surrounding ovary forms the fruit, with the ovary wall becoming the wall of the fruit.
The seeds are then dispersed, if seeds land in an area where favourable they will germinate.

Similar Documents

Free Essay

Religious Education

...lo io yB io g oCSEC B Biologyy og Bi ol gy lo yB io g lo io og B ol Bi y Caribbean Examinations Council ® SYLLABUS SPECIMEN PAPER MARK SCHEME SUBJECT REPORTS Macmillan Education 4 Crinan Street, London, N1 9XW A division of Macmillan Publishers Limited Companies and representatives throughout the world www.macmillan-caribbean.com ISBN 978-0-230-48203-6 © Caribbean Examinations Council (CXC ®) 2015 AER www.cxc.org www.cxc-store.com The author has asserted their right to be identified as the author of this work in accordance with the Copyright, Design and Patents Act 1988. First published 2014 This revised version published 2015 Permission to copy The material in this book is copyright. However, the publisher grants permission for copies to be made without fee. Individuals may make copies for their own use or for use by classes of which they are in charge; institutions may make copies for use within and by the staff and students of that institution. For copying in any other circumstances, prior permission in writing must be obtained from Macmillan Publishers Limited. Under no circumstances may the material in this book be used, in part or in its entirety, for commercial gain. It must not be sold in any format. Designed by Macmillan Publishers Limited Cover design by Macmillan Publishers Limited and Red Giraffe CSEC Biology Free Resources LIST OF CONTENTS CSEC Biology Syllabus Extract 3 CSEC Biology Syllabus 4 ...

Words: 29406 - Pages: 118

Free Essay

Books

............................................................................................................................1 AIMS ..................................................................................................................................................................1 SKILLS AND ABILITIES TO BE ASSESSED ...............................................................................................2 PRE-REQUISITES OF THE SYLLABUS .......................................................................................................5 STRUCTURE OF THE SYLLABUS ..............................................................................................................5 UNIT 1 : BIOMOLECULES, REPRODUCTION AND DEVELOPMENT MODULE 1 : CELL AND MOLECULAR BIOLOGY ...........................................................7 MODULE 2 : GENETICS, VARIATION AND NATURAL SELECTION ....................... 12 MODULE 3 : REPRODUCTIVE...

Words: 11239 - Pages: 45

Premium Essay

Future of Technology

...THE FUTURE OF TECHNOLOGY OTHER ECONOMIST BOOKS Guide to Analysing Companies Guide to Business Modelling Guide to Business Planning Guide to Economic Indicators Guide to the European Union Guide to Financial Markets Guide to Management Ideas Numbers Guide Style Guide Dictionary of Business Dictionary of Economics International Dictionary of Finance Brands and Branding Business Consulting Business Ethics Business Strategy China’s Stockmarket Globalisation Headhunters and How to Use Them Successful Mergers Wall Street Essential Director Essential Economics Essential Finance Essential Internet Essential Investment Essential Negotiation Pocket World in Figures THE FUTURE OF TECHNOLOGY THE ECONOMIST IN ASSOCIATION WITH PROFILE BOOKS LTD Published by Profile Books Ltd 3a Exmouth House, Pine Street, London ec1r 0jh Copyright © The Economist Newspaper Ltd 2005 All rights reserved. Without limiting the rights under copyright reserved above, no part of this publication may be reproduced, stored in or introduced into a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording or otherwise), without the prior written permission of both the copyright owner and the publisher of this book. The greatest care has been taken in compiling this book. However, no responsibility can be accepted by the publishers or compilers for the accuracy of the information presented. Where opinion is expressed it is that of the author and does not necessarily...

Words: 128899 - Pages: 516