Production of seeds without fertilization

Production of fruit without fertilization

Production of seeds without pollination

Production of fruit without pollination

Match the Column I with Column II and select the correct option from the choice below: Column I Column II a. Polyembryony i. Commelina b. Dioecious ii. Grass c. Cleistogamous iii. Date palm d. Apomixis iv. Citrus

a - ( iv ) , b - ( iii ) , c - ( i ) , d - ( ii )

a - ( iv ) , b - ( iii ) , c - ( ii ) , d - ( i )

a - ( ii ) , b - ( i ) , c - ( iv ) , d - ( iii )

a - ( iii ) , b - ( iv ) , c - ( i ) , d - ( ii )

The formation of new plants from an embryo without meiosis and fertilization is called apomixis. According to Hans Winkler (1908), "Replacement of general sexual reproduction by any such method in which meiosis and fertilization do not occur is termed apomixis." In this method, the embryos are formed from haploid cells present in the embryo sac like egg, synergids, etc., or from diploid cells in the ovule like nucellus, integuments, etc. The plants formed by apomixis are either haploid or diploid in nature. Examples: Datura , Maize, etc.

MEDIUM

Earn 100

Assertion: Apomictics do not show segregation of characters in their progeny and therefore have huge potential in hybrid seed industry.

Reason: Apomictic seeds are produced without fertilization.

The correct option among the following is:

100% studentsanswered this correctly

Important Questions on Sexual Reproduction in Flowering Plants

EASY

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

What is Apomixis?

EASY

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Seed formation without fertilization in flowering plants involves the process of

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Statement - ' $X$ ': Apomixis is seen in a few flowering plants such as some species of Asteraceae and grasses.
Statement - ' $Y$ ': Apomixis is a form of asexual reproduction that mimics sexual reproduction.

Statement - ' $Z$ ': In some species of apomictic seeds, the diploid egg cell is formed without reduction division.
Choose the correct option.

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Match the Column I with Column II and select the correct option from the choice below:

Column I	Column II
a. Polyembryony	i. Commelina
b. Dioecious	ii. Grass
c. Cleistogamous	iii. Date palm
d. Apomixis	iv. Citrus

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Write a short note on apomixis.

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Which of the following is not a type of agamospermy?

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

During fertilisation in plants the male and female gametes unite, triggering the process of cell division followed by seed formation. A gene

BBM 1

, expressed only in the male gamete, is responsible for eliciting rapid cell division. A researcher overexpressed the

BBM 1

gene in the female gamete that resulted in the multiplication of the female gamete into an embryo and then the seed. The plants obtained from these seeds were genetically identical to the parent. This phenomenon is commonly seen in a few select plants naturally, and is known as

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Define parthenocarpy.

MEDIUM

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Define apomixis.

EASY

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Write one point of difference between apomixis and polyembryony.

EASY

Biology>Reproduction>Sexual Reproduction in Flowering Plants>Some Special Mechanisms of Reproduction and Incompatibility

Nucellar polyembryony is seen in the species of