NATURE-STUDY LESSONS. 123 



A. External Markings. 



2. (a) Observe an unsoaked bean. 



(J)) Describe its color, shape and surface. 



3. {a) Examine the surface to discover a part different 



from the rest. 



(J)) Find a corresponding part in a pea. 



if) At the first opportunity examine a green pod 



containing beans or peas and infer the cause 



of this scar. 

 This scar on the bean, pea, and other seeds is called the hilum. 



4. With a lens discover a minute orifice near the scar. 



The small opening is called the micropyh. Consult a dictionary to learn 

 the root of this word. Most of the terms used in science are derived from 

 Greek and Latin roots. Knowing that micros means small aids in remem- 

 bering and understanding micropyle, microscope, microspore, micrograph, 

 microbe. 



5. id) Discover also a small protuberance near the scar. 

 {b) Describe its position with respect to the micro- 

 pyle. 



B. Parts of a Seed. 



6. («) With a needle or sharp knife, remove the cover- 



ing from a bean which has been soaked for a 

 day. 

 {b) Where is the coat connected with the rest of the 

 seed? 



7. («) Separate the inner portion of the seed. 

 {U) How many parts do you find ? 



(c) Describe the form and position of each part. 



The two thick parts are the cotyledons or seed-leaves. The small part 

 between these cotyledons in the bean and the pea, pointing towards the 

 micropyle, is the caulicle. The other small part between the cotyledons is 

 the plumule. The cotyledons, caulicle and plumule together constitute the 

 embtye. 



