#19
Polar nuclei fuse to produce Diploid secondary nucleus.
#20
After fertilisation the antipodal cells undergo meosis
#21
In which of the following double fertilisation occurs.
Ans:- Angiosperm s
#22..
In angiosperms pollen grains germinate on the Anther.
<u><em>Intercellular communication involves an electrical charge moving along a cell membrane.</em></u>
Answer: Option D
<u>Explanation:</u>
Intracellular communication means movement between two cells. The Intercellular communication means movement of molecules within a cell. All these cells are interconnected through gap junction. Gap junctions connect directly to the cytoplasm of the two cells.The communication happens through the chemical synapse.
Intercellular communication is required for the proper growth of the cells. Intracellular communication happens by signals passed on through the cell membrane to the nucleus. It is important to control the cells activities.
<span>The answer is: This is a cell (B) with a nucleus (C) containing DNA (A). The DNA is organized into chromosomes (D). A section of the chromosome that codes for a trait is called a gene (E).</span>