An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is:
1. Cuticle
2. Sporopollenin
3. Lignin
4. Cellulose

The gynoecium consists of many free pistils in flowers of:

Even in the absence of pollinating agents, seed-setting is assured in:

1. Commelina

2. Zostera

3. Salvia

4. Fig

The coconut water and the edible part of coconut are equivalent to:

1. Endosperm

2. Endocarp

3. Mesocarp

4. Embryo

Apomictic embryos in Citrus arise from:

1. synergids

2. maternal sporophytic tissue in ovule

3. antipodal cells

4. diploid egg

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:

1. xenogamy

2. geitonogamy

3. karyogamy

4. autogamy