1. What portion of the embryo sac tells you that it is the female gametophyte? 2. When the pollen tube delivers sperm to the embryo sac, double fertilization, as defined previously, occurs. Due to the first fertilization, what happens to the egg? Due to the second fertilization, what happens to the polar nuclei? 3. Following fertilization, the ovules develop into seeds, and the ovary develops into the fruit. What are the three parts of a seed?

(C) State TWO ways in which fermentation process helps to improve [2 marks] quality of food products.

(B) (i) Explain THREE precaution steps during decontamination of biohazard wastes in bag using an autoclave. (ii) Describe TWO materials that will remain undamaged after autoclaving.

8 Which of the following is a type of universal media? (A) MacConkey Agar. (B) Baird-Parker Agar. (C) \( \quad \) Mannitol Salt Agar. (D) Trypticase Soy Agar. 9

Glycerol a) Name the: (i) Process \( X \) (ii) Enzyme \( Y \) (iii) Molecule Z

(B) State TWO ways in which flagellum helps a microorganism survive in an open environment. (2 ma All rights reserved. No part of this publication may be reproduced, stored in a retrieval sys transmitted in any form or by any means, electronic, mechanical, photocopying, reco otherwise, without the prior written permission of the Institute of Technical Education, Singapo Institute of Technical Education has made every effort to trace copyright holders, but if inadvertently overlooked any, we will be pleased to make the necessary arrangements a