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ICSE Class 10 Answered

(a) Given below is a diagram of a double helical structure of DNA: (i) Name the four nitrogenous bases that form a DNA molecule. (ii) Give the full form of DNA. (iii) Name the unit of heredity. (iv) Mention two points of difference between Mitosis and Meiosis. (b) (i) Draw a well labeled diagram of a Neuron showing the following parts: Perikaryon, Dendrites, Axon, Node of Ranvier and Myelin sheath. (ii) State the function of sensory neuron and a motor neuron. (iii) What is a nerve made up of?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

(a) (i) Guanine, Thymine, Adenine, Cytosine.

(ii) De-oxy ribonucleic acid.

(iii)

Mitosis

Meiosis

1. Two daughter cells are produced

1. Four daughter cells are produced

2. Diploid cells are produced.

2. Haploid cells are produced.

(b) (i)

(ii) Sensory neuron transmits impulses from sense organs to the central nervous system.

Motor neurons carry impulses from the central nervous system to the effector organs.

(iii) Nerve is made up of a bundle of nerve fibres enclosed in a sheath.

Answered by | 04 Jun, 2014, 03:23: PM
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