Question

Which of the following statements is not true about the life cycle of flowering plants?
a. Sporophyte is diploid
b. Sporophyte produces heterospores
c. Megagametophyte is the seed
d. Megagametophyte is the embryo sac

Answer 1

In life succession of flowering plants, once the pollen grain sits on the stigma of the identical species of plant, a pollen tube raises down from the grain, throughout the style and into the ovary. Then, male ‘gametes’ pass from the pollen grain beside the tube to the ovary, where they link with female gametes in the ‘ovules‘. This procedure is called ‘fertilization’.

Complete answer:
A sporophyte is the diploid multicellular phase in the life series of a plant. It matures from the zygote created when a haploid egg cell is fertilized by a haploid sperm and every sporophyte cell consequently has a dual set of chromosomes, a single set from each parent. The sporophyte produces heterospores in its life cycle.

The sporophyte makes spores by meiosis, a method also known as "reduction division" that reduces the figure of chromosomes in all spore mother cells by half.

Megagametophyte is the female gametophyte that matures from the megaspores of heterosporous plants. Amid heterosporous species of the lycophyte plants like from the sporophyte plant produces megaspores stocked with food. These spores produce megagametophytes that produce eggs. Megagametophyte is created from megaspore. The megaspore increases into an oval-shaped structure called the embryo sac, which is termed as megagametophyte.

Hence, the correct answer is option (C).

Note: In plants with heteromorphic gametophytes, there are two discrete types of gametophytes. Since the two gametophytes vary in form and function, they are phrased heteromorphic, from hetero- "diverse" and morph "form". The egg generating gametophyte is called a megagametophyte, because it is characteristically superior, and the sperm-producing gametophyte is called a microgametophyte. Gametophytes that manufacture eggs and sperm on separate plants are known as dioecious.