Botany and Plant Science

Some genera have ovules that are rotated at right angle to their stalk. This is called twisting or torsion and is the characteristic of solanaceae.

Microsporophyll is a leaf-like structure that bears microsporangia. Hence, it is a male structure.

The development of an embryo without the occurrence of fertilisation is called apomixis.

Monocarpellary ovary means having single carpel. Diadelphous androecium means stamens are united in two bundles and marginal placentation means that there is only one elongated placenta on one side of the ovary, as ovules are attached at the fusion line. This is the characteristic of family papillionaceae.

Transfer of pollen from anther to stigma is called pollination. Each pollen grain is a male haploid gametophyte, adapted to being transported to the female gametophyte, where it can effect fertilisation by producing the male gamete (or gametes, in the process of double fertilisation). 

 Fruits are formed from ovary of the flowers.

Anther contains pollen grains.

Roots and stem help in vegetative propagation of plants

 Pollen grain sticks to the stigma and then reaches to the ovary for fertilisation.

 The flowers, which contain either only pistil or only stamens are called unisexual flowers.

Eggs are female gametes, which are formed in the bead-like structures called ovules. These ovules are produced in the ovary, which is the female reproductive part.

In milkweeds, sticky cente of two adjacent pollinia is called corpusculum. It makes a stick base of pollinium.

Leaf nodes are situated at the bottom-most level of tree. Internal nodes are any nodes which have child and root nodes; they have no parent node. So, leaf node and internal node are different. No leaf node or internal node can be root node.

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