Question

Read the following statements about the semi-dwarf varieties and select the correct option given.

A. Semi-dwarf varieties are shorter plants with a stronger stalk

B. Semi-dwarf varieties will not fall over in the wind or if the grain head gets heavy

C. They take more time to grow to the height needed to produce grain

D. The tougher stalk makes it difficult to be harvested by heavy machinery, making the harvesting more labor intensive

E. They are resistant to disease

• A. A, B, C and D are correct
• B. A, B, C, D and E correct
• C. A, B and E are correct
• D. A, B, D and E are correct

Answer 1

The correct option is C A, B and E are correct

Semi-dwarf varieties are a group of high yielding plants with short stems. They were introduced into the agricultural lands of India in the 1960s during the Green Revolution period.

Semi-dwarf varieties with shorter and stronger stalks, have lesser chances of falling over in the wind or if the grain head gets heavy. So, statements A and B are correct.

It also takes less time for them to grow to the height needed to produce grain compared to the tall variety. So, statement C is incorrect.

The shorter, tougher stalk can be harvested by heavy machinery, making the harvesting less labor intensive. So, statement D is incorrect.

They are also developed to resistant diseases. So, statement E is correct.

Example: Jaya and Ratna varieties of rice. Kalyan Sona and Sonalika varieties of wheat.