Tuesday, 16 August 2016


All the pigmented organelles of the plant cells are called plastids. The colour of plastids vary with variation in the pigments they contain. The most important kind of plastid is the chloroplast. The colourful plastids are called chromoplasts. Plastids without pigments are called leucoplasts.

Now read the following questions and answers and suggest some more questions for the aspirants for competitive exams. Please help us rectify the mistakes and improve the content.


1) What are the pigmented organelles of plant cells?
A) Plastids
2) What are the first formed Plastids?
A) Proplastids or Eoplasts
3) Where are proplastids formed?
A) Meristems
4) By which process plastids are multiplied?
A) Binary fission
5) What are the non-pigmented colouurless plastids?
A) Leucoplasts
6) What are the starch containing leucoplasts?
A) Amyloplasts
7) How is the response of roots towards soil described?
A) Geotropism
8) What specific kind of organelles help plant roots exhibit geotopism?
A) Amyloplasts
9) What kind of Plastids are present in storage organelles like cotyledons, endosperm,  potato tubers, rice and wheat grains?
A) Amyloplasts
10) What kind of plastids are rich in fats and oils?
A) Elaeoplasts or oleoplasts
11) What kind of plastids are present in coconut and oil seeds?
A) Ealaeoplasts
12) What are the protein rich leucoplasts?
A) Aleuroplasts or proteinoplasts
13) What kind of plastids are abundant in pulses?
A) Aleuroplasts
14) What kind of plastids are abundant in the superficial layer of unpolished rice?
A) Aleuroplasts
15) What kind of plastids are found in plant parts exposed to long shady conditions?
A) Etioplasts
16) What kind of plastids are abundant in root cells?
A) Amyloplasts
17) What kind of plastids are rich in carotenoid pigments?
A) Chromoplasts
18) What kind of plastids impart different colours to flowers and fruits?
A) Chromoplasts
19) What is the primary role of chromoplasts?
A) Pollination and fruit dispersal
20) Which acid is present in cuticle, which is also produced by plastids?
A) Palmitic acid
21) What are the plastids of ageing or senescence in plants?
A) Gerantoplasts
22) How do you call the plastids of tannins and polyphenols?
A) Tannosomes
23) What is plastome?
A) Plastid genome
24) What is the plastid Nucleoid?
A) PlastidialDNA
25) What are the interconnections between different plastids?
A) Stromules
26) What are the starch containing bodies in algae and hornworts?
A) Pyrenoids
27) What are the largest organelles?
A) Plastids
28) What are the largest plastids?
A) Amyloplasts
29) What are the colourless plastids?
A) Leucoplasts
30) What are the green plastids?
A) Chloroplasts
31) What are the colourful plastids?
A) Chromoplasts
31) What are the red plastids?
A) Rhodoplasts
32) What are the brown plastids?
A) Phaeoplasts
33) What kind of inheritance is found in mitochondria and chloroplasts?
A) Maternal inheritance  (from egg only)
34) Who coined the term "plastid"?
A) Schimper
35) Which theory explains the origin of plastids?
A) Endosymbiotic theory
36) What were the symbionts that evolved into plastids?
A) Cyanobacteria  (Bluegreen algae)
37) What are the chloroplasts without photosynthetic function?
A) Apicoplasts
38) What is the phenomenon of intake of plastids by dinoflgellates and seaslugs to carry out photosynthesis?
A) Kleptoplasty
39) Which is the dominant pigment in chloroplasts?
A) Chlorophyll
40) Which are the dominant pigments in chromoplasts?
A) Carotenoids and xanthophylls
41) Which is the dominant pigment in phaeoplasts of brown algae, diatoms and dinoflgeates?
A) Fucoxanthin
42) Which is the dominant pigment in rhodoplasts of red algae?
A) Phycoerythrin
43) Which is the dominant pigment in cyanobacteria?
A) Phycocyanin
44) Which pigments do protect chloroplasts from photooxidtion?
A) Carotenes
45) What are the paint box organelles?
A) Plastids  (Chromoplasts)
46) What are the fat soluble yellow, orange, and red pigments?
A) Carotenoids
47) What are the yellow pigments of xanthophyceae?
A) Xanthophylls
48) What are the blue water soluble pigments in the cell sap of violet-flower cells?
A) Anthocyanins
49) Which is the specific pigment of tomato fruits?
A) Lycopene
50) Which is the giant chloroplast?
A) Blue-green alga

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