Central cell in a female embryo sac, after triple fusion, becomes the:
1. | Zygote | 2. | Primary endosperm nucleus |
3. | Endosperm | 4. | Primary endosperm cell |
‘Germ pore’ in pollen in angiosperms:
1. | is a part of pollen intine where sporopollenin is present |
2. | is a part of pollen intine where sporopollenin is absent |
3. | is a part of pollen exine where sporopollenin is present |
4. | is a part of pollen exine where sporopollenin is absent |
Seed formation is a more dependable reproductive strategy in angiosperms because:
1. | Pollination and fertilization are independent of water |
2. | Seeds have better adaptive strategies for dispersal |
3. | Seeds have sufficient food reserves |
4. | New genetic combinations are generated during seed formation |
Cellular thickenings called filiform apparatus are seen in:
1. | Antipodals | 2. | Synergids |
3. | Egg cell | 4. | Central cell |
Wind-pollinated flowers are characterized by the following, except:
1. | Light and non-sticky pollen grains |
2. | Well-exposed stamens |
3. | Many ovules in each ovary |
4. | Large, often-feathery stigma |
In an angiosperm, the structure that develops and becomes a pollen sac is called:
1. | Megasporophyll | 2. | Megasporangium |
3. | Microsporangium | 4. | Microsporophyll |
Perisperm can be seen in the seeds of:
1. | Beet | 2. | Castor |
3. | Pea | 4. | Groundnut |
The endosperm is usually completely consumed by the developing embryo in all the following except:
1. | Pea | 2. | Castor |
3. | Bean | 4. | Groundnut |
The Yucca plant is pollinated by:
1. an obligatory mutualist moth
2. an obligatory mutualist honeybee
3. a commensal moth
4. a commensal honeybee
What is the advantage of converting hybrids into apomicts for farmers?
1. | Can be easily produced year after year |
2. | Segregation of traits creates more diversity |
3. | A great reduction in cost |
4. | Overcoming inbreeding depression |