2041. What percentage of light reaching th earth is used in photosynthesis ?
A. 25%
B. 10%
C. 05%
D. 01% *
2042. All of the following are involved in nitrification except:
A. Nitrobacter
B. Nitroso monas
C. Rhizobium *
D. All of these
2043. Competition between species will be greatest if they attempt to occupy the same :
A. Ecosystem
B. Community
C. Habitat
D. Niche *
2044. In most ecosystems the greatest amount of energy flows through the :
A. Secondary consumers
B. Herbivores *
C. Carnivores
D. Decomposers
2045. In plants water is absorbed by the root hairs by a process called :
A. Respiration
B. Transpiration
C. Osmosis *
D. Perspiration
2046. Cell wall of chloroplast is removed , the remaining is called :
A. Etioplast
B. Aleuroplast
C. Amylopast
D. Protoplat *
2047. Which tissue is responsible for the passage of water in plants ?
A. Sclerenchyma
B. Xylem *
C. Phloem
D. None of these
2048. Which of the following seeds can help a diabetic person maintain a normal blood sugar level?
A. Coriander seeds
B. Mustard seeds *
C. Fenugreek seed
D. Cumin seeds
2049. Which of the following is used by green plants for the manufacture of sugar ?
A. Carbon dioxide
B. Sunlight
C. Water
D. All of these *
2050. Bamboo is a :
A. Herb
B. Grass *
C. Shrub
D. Tree