Plant Reproduction and Germination

One male gamete fuses with the egg cell to form the diploid zygote (2n), which develops into the embryo. The other male gamete fuses with polar nuclei to form the endosperm nucleus. Tube and generative nuclei are pollen structures, not fertilization products.

The tube nucleus remains at the growing tip of the pollen tube as it elongates toward the ovule and eventually disintegrates. The generative nucleus divides to form two sperm cells. The tube nucleus helps guide pollen tube growth but is not involved in fertilization.

Triple fusion refers to the fusion of one male gamete with the two polar nuclei in the embryo sac, forming a triploid primary endosperm nucleus. This is the second fertilization event in double fertilization. The zygote forms from the first male gamete fusing with the egg cell.

Seeds produced by these plants are not enclosed within the fruits.

Axile placentation can be seen in an orange fruit.

Legume represents the ovary of the carpel. It is monocarpellary.

Seeds remain viable longest in cool and dry conditions because low temperatures slow metabolic processes and respiration, while dryness prevents premature germination and microbial growth. Hot or wet conditions accelerate deterioration and promote rot or early sprouting.

A flower, is also  known as a bloom or blossom. It is the reproductive structure found in flowering plants. All plants produce flowers for the same reason i.e. to make seeds so another plant can grow. A flower is the part of the plant that makes seeds.

Vegetative propagation, the ability of plants to reproduce without sexual reproduction, by producing new plants from existing vegetative structures. Many plants are able to tide over unfavourable conditions. This is because of the presence of organs of asexual reproduction like the tubers, corm, bulbs, etc.

Vegetative propagation means formation of new plants from vegetative parts.

 Phytochrome pigment participates in flowering and seed germination of photoblastic seeds.

Sclerenchyma is a tissue composed of dead cells with extremely thick, lignified walls that provide maximum mechanical strength. Sclereids, a specific type of sclerenchyma cell, are responsible for the hardness of seed coats and nut shells. This protection is vital for the dormant embryo inside.

Yes, it is the correct answer. The seeds of angiosperms are enclosed within a fruit, while gymnosperms have naked seeds.

Seeds are best preserved in cool and dry conditions to prevent premature germination and the growth of mold or fungi. High humidity or heat can damage the embryo and reduce the viability of the seeds.

In the grass embryo, the epiblast is a small, scale-like structure located opposite the scutellum, which is considered a reduced second cotyledon.