Reproductive Morphology of Angiosperm | Botany - Answer the following questions | 11th Botany : Chapter 4 : Reproductive Morphology of Angiosperm
Chapter: 11th Botany : Chapter 4 : Reproductive Morphology of Angiosperm
Answer the following questions
Reproductive Morphology of Angiosperm
Answer the following questions
6. Find out the floral formula for a bisexual flower with bract, regular, pentamerous, distinct calyx and corolla, superior ovary without bracteole.
Br,
ebrl, 
, k(5), C(5), A5,G(5).
7. Give the technical terms for the following: -
a. A sterile stamen _______
b. Stamens are united in one bunch ________
c. Stamens are attached to the petals
8. Explain the different types of placentation with example.
Placentation
The
mode of distribution of placenta inside the ovary
Marginal
It
is with the placentae along the marging of a unicarpellate ovary.
Example – Fabaceae.
Axile
The
placentae arises from the column in a compound ovary with septa.
Example: Hibiscus, tomato lemon
Superficial
Ovules arise from the surface of the septa. Example: Nymphaeceae
Parietal
It
is the placentae on the ovary walls or upon intruding partitions of a
unilocular, compound Ovary.
Example : Mustard, Argemone, cucumber.
Free-central
It
is with placentae along the column in a compound ovary without septa.
Example: Caryophyllaceae, Dianthus, Primrose
Basal
It
is the placenta at the base of the ovary.
Example
: Sunflower(asrteraceae) Marigold
9. Differenciate between aggregate fruit with multiple fruit.
Aggregate fruits
Definition
*
develops from single flower with apocarpous pistil
*
Each carpel develops into a simple fruitlets
*
A collection of simple fruit lets- aggregate fruit
*
Types- based on the single fruit type
Aggregate
of berries - Eg. Annona polyalthia
Aggregate
of drupes - Eg. Raspberry
Aggregate
of achenes - Eg. Strawberry, elematis
Aggregate
of follicles - Eg. Calotropis magnolia
Multiple fruits
Whole
inflorescence develop into a fruit
2
example
a. Sorosis - A
spake or spadix _ inflorescence develop into a fruit perianth is edible fruit
Eg. Jack fruit
A
flowers in an inflorescence into a single mass called infructescence
Eg. Pineapple
b. Syeonus -
hypanthodeum inflorescence develop into fruit. The receptaele encloses many
achenes developing from female flower of hypanthodium. Eg.fieus
10. Explain the different types of fleshy fruit with suitable example.
Definition - fleshy
fruit derived from single pistil pericarp is fleshy differentiated into epicarp-mesocarp
& endocarp
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