Answer: Option B. -> Plastids
:
B
Plastid is a smalldouble-membraned organelleofplantcells, occurringinseveralvarieties,asthechloroplast,containing ribosomes,prokaryoticDNA,andpigment.

Answer: Option B. -> While lipids can rarely flip flop, proteins cannot
:
B
Flip flop movement is rarely found in lipid molecules, whereas it remains absent in protein molecules.

Answer: Option A. -> Plasmodesmata    
:
A
The primary cell wall contains many small openings or pores situated in the primary pit fields. The cytoplasms of adjacent cells communicate through the pores by means of cytoplasmic bridges called plasmodesmata. The plasmodesmata permit circulation of fluids and passage of solutes between cells

Answer: Option A. -> Round structure, that makes rRNA, situated in the nucleus
:
A
Thenucleolusis the nuclear subdomain that assembles ribosomal subunits in eukaryotic cells. The nucleolarorganiser regions of chromosomes, which contain the genes for pre‐ribosomal ribonucleic acid (rRNA), serve as the foundation fornucleolarstructure

Answer: Option A. -> Both the assertion and reason are true and the reason is the correct explanation for assertion.
:
A
The genomes of most eukaryotes are larger and more complex than those of prokaryotes. The presence of large amounts of noncoding sequences is a general property of the genomes of complex eukaryotes. In eukaryotic cells, DNA packaging is more complicated because they contain an amount of DNA that is much larger than that of prokaryotic cells. So eukaryotic cells which have complex chromosomes are composedof DNA-histone proteins. But in prokaryoticcells,histones are absent.

Answer: Option C. -> Ribosomes 
:
C
Ribosomesare the cellular organelles that carry out protein synthesis, through a process called translation. They arefound in both prokaryotesandeukaryotes.

Answer: Option B. -> chromatin
:
B
The DNA + histone protein =chromatin.The DNA double helix in the cell nucleus is packaged by special proteins termed histones. The formed protein/DNA complex is calledchromatin. The basic structural unit ofchromatinis the nucleosome.

Answer: Option D. -> All cells arise spontaneously
:
D
For centuries people accepted the "spontaneous generation" of life from inanimate matter. When this long-standing myth was finally dispelled in the mid-1800's by Pasteur with his swan neck flask experiments, it became clear that all life must arise from pre-existing life —viaa process of reproduction.

Answer: Option A. -> The peptidoglycan cell wall of the bacteria
:
A
Acell wallis a layer located outside thecell membranefound in plants, fungi,bacteria, algae, and archaea. A peptidoglycancell wallcomposed of disaccharides and amino acids givesbacteriastructural support.The peptidoglycan layer in the bacterial cell wall is a crystal lattice structure formed from linear chains of two alternating amino sugars, namely N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM).

Answer: Option C. -> Cell theory does not hold good because all living being do not have cellular organization (e.g., viruses)
:
C
Cells theory proposed by 'Schwann andSchleiden' states that all living organisms whether animals or plants are made up of cells and have similar organization. It is the unit of structure and function. Exception to cell theory are cellular organisms, i.e., lacks cellular organizations. Moreover, coenocytic forms like Paramecium,Rhizopus, have more than one nuclei and areexceptions to cell theory.