Science 'N' us-5 final - School Books Publishers India

2.REPRODUCTION IN PLANTSExerciseA. Answer the following questions :1. What is reproduction? What are the different methods of reproductionin plants?Ans. Plants produce this own kind. This process is called reproduction.Different methods of reproduction in plants are :(i) Reproduction through seeds(ii) Reproduction through spores(iii) Reproduction through their body parts2. What is germination? What are the conditions necessary for it?Ans. Inside the seed, there is a tiny plant called the embryo. If the seed isgiven water, air and warmth, it comes to life. The embryo begins togrow. This process is called germination. The main condition forgermination is to given water, air and warmth to grow.3. Describe structure of a seed.Ans. The structure of a seed : It is hard and cannot broken easily because ithas a thick outer covering called the seed coat. It protects the seed. Onone side of the seed there is a scar. This is where the seed was attachedto the fruit. On the top of the scar, we can observe a small hole. This holeallows water to enter the seed.4. What is meant by seed dispersal?Ans. A plant produces large number of seeds. If all these seeds fall under theparent plant, the plants grown from them will fight for this survival.Seed should spread to far off places and away from the parent plant toavoid over crowding and thereby the competition of light, water andnutrients. This scattering of seed or fruits away from the mother plant iscalled dispersal.5. How do animals help in the dispersal of seeds?Ans. The animal eats the fruits, but only the juicy part is digested. The seed passthrough the animal's digestive system and are excreted. This can happenfor away from the parent plant. In this way, animals help in seed dispersal.6. What is vegetative propagation? Name any two plants thatreproduce in this way.Ans. The method of reproduction in which plants reproduce by the bodyparts like roots, stems and leaves is called vegetative propagation.1. Rose plant 2. leaf of bryophyllumHorizon Press107Science 'n' Us - 1 to 5