Aquatic plants do not contain
a) chloroplasts
b)cells
c) lignin
d) nuclei
e) chlorophyll

Answer;

c) lignin

Explanation;Aquatic plants are plants that live within watery environments, they serve as food and habitat for animals living in the sea and prevent shorelines, ponds and lakes from eroding by providing soil stability.Aquatic plants have less rigid structure since water pressure supports them.The cell walls of all vascular plants contain a polymer called lignin.  Lignin is water-resistant polymer which reinforces cell walls, keeping them from collapsing.Aquatic plants lack lignin as they are supported by water pressure which prevents them from collapsing and reinforces the cell walls.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Ithink the answer is d.