Study the diagram given below and then answer the questions that follow:

(i) Name the part labelled A. Name any two hormones produced by the part labelled A.

(ii) What happens to the part labelled B:

1. If fertilisation takes place?
2. If fertilisation does not take place?

(iii) Where does fertilisation occur?

(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts:

1. Acrosome
2. Mitochondria

A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds :

(i) Give the scientific name of the plant on which Mendel conducted his hybridization experiments.

(ii) Give the genotype of the F₁ generation.

(iii) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F₂ generation when two plants of the F₁ generation are crossed.

(iv) Name and state the law which explains the dihybrid ratio.

(v) Give the possible combinations of gametes that can be obtained from F₁ hybrid.

The diagram given below show the cross section of two kinds of blood vessels:

(i) Identify the blood vessels A and B. In each case give a reason to support your answer.

(ii) Name the parts numbered 1 and 2.

(iii) When are the sound "LUBB" and "DUP" produced during a heartbeat?

(iv) Name the blood vessel that:

1. begins and ends in capillaries
2. supplies blood to the walls of the heart.

Answer the following:

(i) Draw a well labelled diagram of a 'Neuron' and name the following parts

1. Node of Ranvier
2. Nissil granules
3. Cyton

(ii) Name the part of the human brain which is concerned with the following :

1. Seat of memory
2. Coordinates muscular activity

(iii) Mention any three major activities of the WHO.