Question

Define the following terms. 

1. Aestivation: 

2. Placentation: 

3. Actinomorphic: 

4. Zygomorphic: 

5. superior ovary: 

6. Perigynous flower: 

7. Epigynous

Answer 1

1. Aestivation: Arrangement of sepals and petals in an unopened flower bud. 

2. Placentation: The mode of arrangement of ovules within the ovary 

3. Actinomorphic: When a flower can be divided into two equal radial halves at any radial plane. 

Eg: Chinarose. 

4. Zygomorphic: When a flower can be cut into two equal halves only in one vertical plane. 

Eg: pea. 

5. Superior ovary: When gynoecium occupies superior or highest position while other parts are situated below it. 

Eg: Mustard. 

6. Perigynous flower: If the gynoecium is at the centre and all other, parts arise on the rim of the thalamus. 

Eg: Rose