Biology MCQ Question and Answer
Biology MCQ Question and Answer
142. Plant bends towards the source of light on account of the movement of curvature known as
- geotropism
- thigmotropism
- chemotropism
- phototropism
143. Photo-oxidation is
- photorespiration
- photolysis
- light and oxygen induced breakdown
- All of the above
144. Plants absorb most part of water needed by them through their
- embryonic zone
- growing point
- root hairs
- zone of elongation
145. Placenta is the structure formed
- by the union of foetal and uterine tissue
- by foetus only
- by fusion of germ layers
- None of these
147. Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
- flavoxanthin
- melanin
- carotene
- xanthopny II
148. Normal adult human male has
- 10 gram of haemoglobin/100 gram of blood
- 14 gram of haemoglobin/100 gram of blood
- 18 gram of haemoglobin/100 gram of blood
- 24 gram of haemoglobin/100 gram of blood
149. Radical vascular bundles are those in which
- xylem is surrounded by phloem
- phloem is surrounded by xylem
- xylem and phloem occur on the same radius
- xylem and phloem occur on the different radii