1. For each definition below, choose the key term that best matches the definition. a. the smoke inhaled and exhaled by the smoker b. a gas that blocks oxygen from entering the bloodstream c. a lung disease in which the alveoli lose their elasticity or become blocked d. any chemical or agent that causes cancer e. a sticky substance in tobacco smoke that coats the inside of the airway and contains many carcinogens f. the addictive drug found in tobacco

3. science deals with living things A. \( r \) Earth B. \( \curvearrowright \) Physical C. \( \curvearrowright \) Life D. Human

11. How are a hypothesis and a theory similar? A. A hypothesis and a theory cannot be revised. B. Theories and hypotheses are produced by experts. C. They are about equally true. D. They are attempts to explain natural phenomena.

(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

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

Embroynic in character on the cell retain the ability to divide. These tissues present in mature plant are called meristematic Thoes plant tissues which