Lactobacillus is the primary genus of bacteria responsible for fermenting milk into curd by producing lactic acid.
67. Potatoes and tomatoes came from which country?
(A) North America
(B) China
(C) South America
(D) Europe
Answer:
(C) South America
Explanation:
Potatoes, tomatoes, and green chilies originally evolved and were cultivated in South America before being introduced to the rest of the world by European explorers.
68. Which part of the plant carries water ?
(A) phloem
(B) xylem
(C) bark
(D) all of these
Answer:
(B) xylem
Explanation:
Xylem is the specialized vascular tissue in plants responsible for transporting water and dissolved minerals upward from the roots to the rest of the plant.
69. Why should we do rain water harvesting?
(A) to make use of rain water
(B) to store rain water
(C) to increase the under ground water level
(D) all of these
Answer:
(D) all of these
Explanation:
Rainwater harvesting serves multiple critical purposes: capturing runoff for direct use, storing it for future shortages, and allowing it to percolate into the soil to recharge depleted groundwater tables.
70. Process of making food by plants is called.
(A) electrosynthesis
(B) photosynthesis
(C) thermos synthesis
(D) chemosynthesis
Answer:
(B) photosynthesis
Explanation:
Photosynthesis is the biological process by which green plants use sunlight to synthesize nutrients (glucose) from carbon dioxide and water.
