Question

2. O wiese medisins applies to IPOTHUCA SCUS! 3. How is seed mucilage 'produced and where exactly is it produced from? 4. True or false? The balance between the activities of abscisic acid (ABA) and gibberellin (GA in seeds is under both developmental and environmental control. 5. How is the balance of GA and ABA important in the dormancy of seeds? 6. Define the terms 'secondary metabolites' and 'allelopathy', indicating their relevance in plant- plant interactions. 7. Identify the 3 major classes of plant secondary metabolites. 8. True or false? Since the following 5 plant hormones - cytokinins, giberellins, brassinosteroids, abscisic and strigolactones- are all derivatives of the pathways that produce secondary metabolites, these hormones are also considered secondary metabolites.

Answer 1

3. Mucillage is a polar glycoprotein exopolysachharide that is produced by most of the plants nearly all plants and they perform the function of the storage of water and food in the plants and they also have some role in the seed germination.. They are also responsible for the thickening of the stems of the cacti. The presence of mucilages helps the seeds in overcoming the harsh ecological conditions like water stress, protection from allelopathy etc.

It is produced by the green algae group known as the VOLVOCALES and is produced at a certain point in their life cycle.

4. This statements is true.

5.The balance is important because the action of the 2 hormones ABA and GA is opposite to each other in the case if dormancy of the seeds. The GA when present in the higher they helps in the break down of the seed dormancy where as if the other hand the ABA is a stress hormone and it helps in the protection of the seed by retains its dormant condition. The balance between the GA and ABA is controlled by certain environmental aspects like light temperature and also certain internal conditions like the availability of water. There are many cross talk pathways between the aba and GA signalling that regulates the seed dormancy.

6. Secondary metabolites are those substances that are produced by certain metabolic pathways in the organism or by the slight modification of their metabolic pathways but these compounds have no role in the growth and development of the organism. These organism helps in the protection and survival and competetion of the plants.

Allelopathy is a process or a phenomenon by which a biological organism produces one or more chemicals that are harmful for the growth, germination, survival and reproduction of other organism that are present around the producer.