Question

Which one of the following statements is not correct
A. In Potato, Banana, and Ginger, the plantlets arise from intemodes present in the modified stem.
B. Water Hyacinth, growing in standing water, drains oxygen from water that leads to death of fishes
C. Offspring produced by asexual reproduction are called clone
D. Microscopic, motile asexual reproductive structures are called zoospores

Answer 1

A zoospore is defined as an asexuall spore that has flagellum (used for locomotion) with it.
Asexual reproduction is a that type of reproduction which does not involve the fusion of gametes or change in the number of chromosomes or genetic material. Water hyacinth is a free-floating perennial aquatic plant (or hydrophyte) native to tropical and subtropical regions.

Complete answer:
A) In potato, banana, and ginger, the plantlets arise from its nodes that are present in the modified stem. Tubers of potato are explained as the underground modification of stem which stores starch. It has buds on the nodes which helps in the growth of new plants as these buds are meristematic in nature. The buds are also called as eyes. Ginger is usually propagated by the rhizome. It is a type of underground stem modification. The terminal bud of rhizomes may or may not grow into an aerial shoot. The stem is differentiated into two things the one is nodes and the other one is internodes. Adventitious root occurs on the lower side. The plantlets arise from nodes present in the modified stem. Banana is propagated by inflorescence. The female flowers of the inflorescence are present on the node of the true stem that matures and develops into fruit without fertilization of gametes. So, statement 1 is incorrect.
B) Water hyacinth is an aquatic weed which is popularly called as the terror of Bengal because it grows very rapidly and eliminates the growth of several species and even it eliminates them. Due to its voluminous growth in water bodies, it increases the biological oxygen demand of the water and leads to the death of aquatic life which is also a cause of major decrease in biodiversity due to alien species invasion. The statement is true.
C) A sexually developed plants are the clones of their own parents because the fusion of gametes does not take place in vegetative propagation so there is no exchange of chromosomes and no chance of recombination and variation. The parent cell divides to form a daughter cell by mitosis due to which the offspring are genetically identical to the parent. The statement is true.
D) A zoospore is a motile asexual spore that uses a flagellum for its locomotion. The statement is true.

So, the correct option is A.

Note:
The three plant structures for storing water are stems, leaves and roots. Modified plant structures are called tubers. An example of a modified plant structure for a stem is a potato.potato is called a stem tuber.