a) Name the following:
(1 x 5 = 5 marks)
1. The effect of excessive transpiration on leaves.
2. The reaction by which the water molecules are broken down by means
of light in photosynthesis.
3. A blood vessel that supplies oxygen to heart.
4. The part of nephron present in renal medulla.
5. A condition caused due to hypo secretion of thyroxine in children.
Answers
Answer:
Explanation:
1.Transpiration serves to evaporatively cool plants, as the evaporating water carries away heat energy due to its large latent heat of vaporization of 2260 kJ per litre.
2.In the light reactions, the energy of light is used to "split water," stripping a pair of electrons from it (and causing the two hydrogens to be lost), thus generating molecular oxygen.
3.Coronary Circulation
The aorta (the main blood supplier to the body) branches off into two main coronary blood vessels (also called arteries)
4.Different sections of nephrons are located in different parts of the kidney: The cortex contains the renal corpuscle, proximal, and distal convoluted tubules.
5.The body can also produce too little thyroxine, a condition known as hypothyroidism. Low thyroxine levels cause problems with development if it occurs when an individual is young.