The outermost and innermost wall layers of microsporangium in an anther are respectively.
1. Endothecium and tapetum
2. Epidermis and endodermis
3. Epidermis and middle layer
4. Epidermis and tapetum
Which one of the following statements is correct?
1. Sporogenous tissue is haploid
2. Endothecium produces the microspores
3. Tapetum nourishes the developing pollen
4. Hard outer layer of pollen is called intine
1. | Exine of pollen grains is made up of sporopollenin |
2. | Pollen grains of many species cause severe allergies |
3. | Stored pollen in liquid nitrogen can be used in crop breeding programs |
4. | Tapetum helps in the dehiscence of anther |
1. | connective | 2. | placenta |
3. | thalamus or petal | 4. | anther |
In grasses what happens in microspore mother cell for the formation of mature pollen grains:
1. One meiotic and two mitotic divisions
2. One meiotic & one mitotic division
3. One meiotic division
4. One mitotic division
During microsporogenesis, meiosis occurs in
1. endothecium
2. microspore mother cells
3. microspore tetrads
4. pollen grains
In angiosperms, microsporogenesis and megasporogenesis?
1. Occur in anther
2. Form gametes without further divisions
3. Involve meiosis
4. Occur in ovule
1. | Sporopollenin can be degraded by enzymes |
2. | Sporopollenin in made up of inorganic materials |
3. | Sporopollenin can withstand high temperatures as well as strong acids and alkalis |
4. | Sporopollenin can withstand high temperatures but not strong acids |