Question

Point out the odd one ..........

a. Nucellus b. Embryo sac

c. Micropyle d. Pollen grain​

Answer 1

Answer:

d. pollen grain

hope it may help u

Answer 2

Answer:

The pollen grain is the odd one.

Explanation:

Pollen grain: It carries the male reproductive cells (gametes) in a plant.

• It is a haploid microgametophyte.
• The main function is to transfer the male gametes to the female counterparts (ovules).
• Ovules are the female reproductive cells, they are present in the embryo sac
• This transferring of gametes facilitates sexual reproduction in plants.

Nucellus: This occupies the major part of the ovule, it is a nutritive tissue for the embryo.

• Nucellus encloses the embro sac
• They have food stored abundantly for the embryo.
• One of the cells acts as a megaspore mother cell in the micropylar region through differentiation.

Embryo sac: The embryo sac is also called a female gametophyte.

• It is an oval structure, it is present in the ovule of a flowering plant.
• It is formed when a haploid megaspore nucleus divides.
• It consists of two haploid nuclei and six haploid cells, with no cell wall.

Micropyle: The small opening which is present at the tip where the integument does not cover the nucellus.

• The pollen tube enters the ovule through a micropyle.
• It is present as a small pore above the hilum in the seed.
• It helps in absorbing the water at the time of germination.
• The root emerges at the time of germination of the seed through the micropyle.

Hence, the nucellus, embryo sac, micropyle are the parts of a female reproductive part whereas the pollen grain is the part of a male reproductive part.