Botany

Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.

How is the study of plant anatomy useful to us?

Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.

What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

The transverse section of a plant material shows the following anatomical features – (a) the vascular bundles are conjoint, scattered and surrounded by a sclerenchymatous bundle sheaths. (b) phloem parenchyma is absent. What will you identify it as?

Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.

Draw illustrations to bring out the anatomical difference between (a) Monocot root and Dicot root (b) Monocot stem and Dicot stem

In a pinnately compound leaf, the leaflets are arranged along the sides of a common axis called the rachis, as seen in neem. In a palmately compound leaf, the leaflets are attached at a common point at the tip of the petiole, as in silk cotton.

(a) In racemose inflorescence, the main axis continues to grow and the flowers are borne laterally in an acropetal succession, e.g., mustard. In cymose inflorescence, the main axis terminates in a flower and the subsequent growth is by lateral branches, which also end in flowers, showing basipetal succession, e.g., jasmine. (b) An apocarpous ovary has … Read more

(a) Aestivation is the mode of arrangement of sepals or petals in floral buds with respect to the other members of the same whorl. (b) Placentation refers to the arrangement of ovules within the ovary. (c) Actinomorphic flowers are those which can be divided into two equal halves in any radial plane passing through the … Read more