1. The kidneys in human beings are a part of the system for (a) nutrition
(c) excretion.
(b) respiration
(d) transportation

2. The xylem in plants are responsible for
(a) transport of water
transport of amino acids.
(b)transport of food.
(c)transport of oxygen.

3. The autotrophic mode of nutrition requires
(a) carbon dioxide and water
sunlight
(b) chlorophyll.
(c)all of the above.

4. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm
(b) chloroplast.
(c)nucleus.
(d)mitochondria.