Question

a. Fruit is the product of fertilization. Is there any fruit that is formed without the act of fertilization?
b. Represent the classification of fruits in a diagrammatic sketch.

Answer 1

a. The structure of neuron: Nerve cells or neurons are the structural and functional units of the nervous system. It consists of three major parts namely, Cell body, dendrites, Axon.
Cell Body: It is irregular in shape or polyhedral. The cell body contains cytoplasm and certain granular bodies called Nissles granules which contain a group of ribosomes for protein synthesis.
Dendrites: Dendrites are short fibres which branch repeatedly and protrude out of the cell body. They transmit electrical impulse towards the cyton.
Axon: They are long fibres arising from the cell body with the branched distal end.
It terminates in bulb-like structures called synaptic knob. It is filled with chemicals called neurotransmitters.
Parts of Axon:
- Axoplasm: It is the cytoplasm of the axon.

- Myelin sheath: It is made up of many layers of Schwann cells.
- Neurilemma: The outermost layer of Schwann cells.

- Nodes of Ranvier: These are gaps left by a myelin sheath.

b. Yes, there are some fruits which develop without the act of fertilization. Such fruits are called Parthenocarpic fruits. For example, seedless grapes.

c. Diagrammatic sketch of classification of fruit: