BIOLOGY [2 Mark Question Answer]

Monodelphous, Didelphous

(i) 1 pollen chamber, 2 Anther and 3. filament
(ii) male organ
(iii) Produce male gamete (pollen grains)

(i) 1. petal, 2. anther, 3. filament, 4. Ovule, 5. receptacle, 6. Pedicel, 7. stigma, 8. style, 9. ovary
(ii) bisexual
(iii) Mustard, Gram

(a) a stamen

(b) a pistil

The inflorescence is the manner in which the flowers are arranged on the flowering axis. During the flowering season, the vegetative apex of the stem gets converted into a floral meristem. Based on whether the floral axis continues to grow or end in a flower, the inflorescence is classified into racemose and cymose.

When both sexes are absent from a flower or are non-functional, the flower is said to be neuter. Neuter flowers have undeveloped or nonfunctional sexual organs. They have pistils and stamens that are nonfunctional or absent. The flowers are androgynous and the plants reproduce asexually. ex- sunflower

accessory whorls: sepals(calyx)-protection of reproductive inner part of flower. petals(carolla)- To attract bees, butterfly etc insects for transfer of pollen grains. Essential whorls: Gynocium (female reproductive part) - and Androcieum (male reproductive part)- both take part in sexual reproduction.

The main difference between flower inflorescence is that flower is a modified shoot, which serves as the reproductive organ of flowering plants whereas inflorescence is a group of flowers arranged on a floral axis. Flower and inflorescence are two structures produced by the sexual reproduction of flowering plants.

The flowers with apocarpous ovaries have more than one carpel with free nature. The flowers which have syncarpous ovaries tend to have fused carpels. These free carpels constitute an aggregate of fruits.

Complete flowers contain four flower parts: petals, sepals, stamen, and pistil. Incomplete flowers are missing one or more of these four parts. It is possible for a perfect flower to be incomplete, but it is not possible for an imperfect flower to be complete

The peduncle is the stalk of a flower or an inflorescence. When a flower is borne singly, the internode between the receptacle and the bract (the last leaf, often modified and usually smaller than the other leaves) is the peduncle.

The pedicel is a stalk or stem that supports a single flower. It connects the single flower to the inflorescence. It is usually seen in pedicellate flowers (e.g., Rose).

A syncarpous gynoecium is composed of two or more connate carpels. You can often tell that carpels are connate when several stigmas are present. The term "compound pistil" is equivalent to a "syncarpous gynoecium"

Apocarpous gynoecium means the presence of more than one carpel and the carpels are separate or unfused. It is a primitive condition. The examples of Apocarpous gynoecium include -Strawberry and Buttercup