Select the correct option: Who gave the lamellar or sandwich model of the cell membrane?

• (a) Singer and Nicolson
• (b) Danielli and Davson
• (c) J. Robertson
• (d) None of these

Which one is the first national park in India?

• A. Kanha National Park
• B. Jim Corbett National Park
• C. Kaziranga National Park
• D. Satpura National Park

Which one of the following breeds of cattle is cross-breed and high milk yielding?

• A) Sahiwal
• B) Karan-swiss
• C) Tharparkar
• D) Jersey

The initial step for cultivation of crops is

• Sowing
• Preparation of soil
• Irrigation
• Harvesting

What is the most important brain or heart?