284878
Which of the following is free living aerobic non-photosynthetic nitrogen fixing bacterium ?
1 Rhizobium
2 Azotobacter
3 Nostoc
4 Azospirillium
Explanation:
B Azotobacter is a genus of free living, nitrogen fixing bacteria commonly found in soil. These convert atmospheric nitrogen \(\left(\mathrm{N}_{2}\right)\) into ammonia \(\left(\mathrm{NH}_{3}\right)\), a form of nitrogen that plant can ready use for their growth because the atmospheric nitrogen is not available to plant. Anabena is free living and symbiotic nitrogen fixing bacteria. Clostrodium is free living, anaerobic, nitrogen fixing bacteria.
Haryana PMT-2001
Neural Control and Coordination
284879
Meissner corpuscles are responsible for:
1 heat and present in skin
2 cold and present in skill
3 pressure and present in skin
4 pain and present in skin
Explanation:
C Meissner's corpuscles also known as tactile corpuscles are found in the upper dermis but they project into the epidermis. They are found primarily in the glabrous skin on the fingertips and eyelids. They respond to fine touch and pressure.
284878
Which of the following is free living aerobic non-photosynthetic nitrogen fixing bacterium ?
1 Rhizobium
2 Azotobacter
3 Nostoc
4 Azospirillium
Explanation:
B Azotobacter is a genus of free living, nitrogen fixing bacteria commonly found in soil. These convert atmospheric nitrogen \(\left(\mathrm{N}_{2}\right)\) into ammonia \(\left(\mathrm{NH}_{3}\right)\), a form of nitrogen that plant can ready use for their growth because the atmospheric nitrogen is not available to plant. Anabena is free living and symbiotic nitrogen fixing bacteria. Clostrodium is free living, anaerobic, nitrogen fixing bacteria.
Haryana PMT-2001
Neural Control and Coordination
284879
Meissner corpuscles are responsible for:
1 heat and present in skin
2 cold and present in skill
3 pressure and present in skin
4 pain and present in skin
Explanation:
C Meissner's corpuscles also known as tactile corpuscles are found in the upper dermis but they project into the epidermis. They are found primarily in the glabrous skin on the fingertips and eyelids. They respond to fine touch and pressure.