Genetics And Plant Breeding - Study Mode
[#331] Asexual reproduction includes
Correct Answer
(D) Apomixis
Explanation
Solution: Asexual reproduction includes apomixis. Apomixis (asexual seed formation) is the result of a plant gaining the ability to bypass the most fundamental aspects of sexual reproduction: meiosis and fertilization. Without the need for male fertilization, the resulting seed germinates a plant that develops as a maternal clone.
[#332] Mass pedigree selection method of breeding is particularly, useful for improvement of
Correct Answer
(A) Self pollinated crops
Explanation
Solution: Mass pedigree selection method of breeding is particularly, useful for the improvement of Self-pollinated crops. This method consists of selection among individual plants and their progeny during inbreeding following crosses between selected donor parents. The parents are normally crossed in a single cross system. The pedigree method describes a selection protocol utilized during the inbreeding of populations of self- and cross-pollinated species in the development of homozygous lines with more developed and improved traits.
[#333] Primitive cultivars that are selected and cultivated by famers for many years are
Correct Answer
(A) Land races
Explanation
Solution: Primitive cultivars that are selected and cultivated by famers for many years are Landraces. Landraces are defined as dynamic populations of a cultivated plant with a historical origin, and distinct identity, often genetically diverse and locally adapted and associated with a set of farmers' practices of seed selection and field management as well as with a farmers knowledge base. A landrace is a dynamic population of a cultivated plant that has historical origin, distinct identity and lacks formal crop improvement, as well as often being genetically diverse, locally adapted and associated with traditional farming systems.
[#334] Incompatibility is very common in plant kingdom was reported by
Correct Answer
(B) Lewis
Explanation
Solution: Incompatibility is very common in the plant kingdom as reported by Lewis. Incompatibility is a physiological mechanism that enforces outbreeding. It is widespread throughout the families of flowering plants. Incompatibility is due in some species to the failure of pollen germination, in others to the pollen tubes failing to penetrate the full length of the style. Incompatibility in species crosses and their derivatives show that species without an incompatibility system have polygenic modifiers which weaken the action of the S gene.
[#335] In misogamy the pollen tube enters into the embryo sac through
Correct Answer
(B) Micropyle
Explanation
Solution: In misogamy, the pollen tube enters the embryo sac through the Micropyle. Misogamy is an aversion to or hatred of marriage. The word dates from the mid-17 th century and combines the Greek misos (hatred) with gamos (marriage). Merriam-Webster date the first use of the word to around 1656. The micropyle is a small opening in the surface of an ovule, through which the pollen tube penetrates, often visible as a small pore in the ripe seed.