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