Chapter Chosen

Strategies for Enhancement in Food Production

Book Chosen

Biology

Subject Chosen

Biology

Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12

In maize, hybrid vigour is exploited by

  • bombarding the seeds with DNA

  • crossing of two inbred parental lines

  • harvesting seeds from the most productive plants

  • inducing matations


B.

crossing of two inbred parental lines

Hybrid varieties were first developed in maize, which is a cross-pollinated crop. In such crops, the parents of hybrid varieties are, ordinarily, inbred lines. A inbred line is a nearly homozygous line produced by continuous inbreeding in a cross-pollinated crop and is maintained by strict inbreeding. In maize, hybrid vigour or heterosis is exploited by crossing of two inbred parental lines. 

Hybrid varieties were first developed in maize, which is a cross-pollinated crop. In such crops, the parents of hybrid varieties are, ordinarily, inbred lines. A inbred line is a nearly homozygous line produced by continuous inbreeding in a cross-pollinated crop and is maintained by strict inbreeding. In maize, hybrid vigour or heterosis is exploited by crossing of two inbred parental lines. 

462 Views

Explain why Inbreeding cannot be continued for long .

Inbreeding if continued causes Inbreeding depression that means  productivity and fertility of the organisms is eventually reduced. Inbreeding produces homozygous condition and exposes harmful recessive genes.
583 Views

Give one example of each of indigenous and exotic milch breeds of cow.

Indigenous breed : Sahiwal;
Exotic breed : Brown swiss.
761 Views

Who is called the Father of White revolution ?

Dr. V. Kurien.
647 Views

What was the aim of white revolution ?

Increased milk production.
612 Views

Define the livestock.

Domesticated animals reared using agricultural practices for the production of milk, hide, flesh, etc for human use.
843 Views