12th class (Fsc) Biology unit 5 MCQs
chapter 5 MCQs 12th Class Biology
Growth and Development:
1. Primary growth in plants is caused by:
a. Intercalary meristem
b. Apical meristem
c. Rib meristem
d. Lateral meristem
2.In the zone of elongation: the volume of the cells increase upto:
a. 200 times
b. 100 times
c. 250 times
d. 150 times
3. Intercalary meristem are situated at:
a. Base of internode
b. Root apex
c. Top of internode
d. Shoot apex
4. Young tissues retaining the potential to divide:
a. Phloem
b. Meristem
c. Cork
d. Xylem
5. In phylum coelenterate special cells cnidocytes give rise to:
a. Gastrozoids
b. Polyps
c. Gemmules
d. Nematocysts
6. Secondary growth leads to an increase in the diameter of the:
a. Leaf
b. Stem
c. Stem and root
d. Root
7. A plant has a growth pattern called:
a. Meristem
b. Open growth
c. Apical
d. Growing point
8. During elongation, the cell volume increase upto:
a. 150 fold
b. 50 fold
c. 200 fold
d. 100 fold
9. Growth rate is influenced by:
a. Vitamins
b. Hormones
c. Water
d. All of these
10. Vitamins are the organic compounds synthesized within the plant bodies in the presence of:
a. Light
b. Water
c. Oxygen
d. Nutrients
11. Cambium is formed in stage:
a. Three
b. One
c. Four
d. Two
12. Which light enhances cell division and retards cell enlargement?
a. Blue
b. Red
c. Violet
d. Green
13. For maximum growth, optimum temperature is:
a. 25-300 C
b. 0-350 C
c. 35-400 C
d. 5-100 C
14. Optimum temperature for growth of plants is:
a. 10 – 20 0C
b. 30 – 40 0C
c. 20 – 40 0C
d. 25 – 30 0C
15. The removal of apex release that lateral buds from the apical dominance. It is called:
a. Apical dominance
b. Inhibitory
c. Reproduction
d. Compensatory effect
16. Neurula is the stage is which embryo has:
a. The germ layers
b. Blastocoel
c. Archenterons
d. Neural tube
17. The mesodermal cells do not invaginate but migrate medially and caudally from both sides and create a midline thickening called:
a. Epiblast
b. Henseon’s node
c. Hypoblast
d. Primitive streak
18. The discoidal cap of cells above the blastocoel is called:
a. Endoderm
b. Ectoderm
c. Blastoderm
d. Mesoderm
19. Movement and rearrangement of the cells in the embryo is called:
a. Organogenesis
b. Cleavage
c. Fertilization
d. Gastrulation
20. Immediately after fertilization the egg undergoes a series of mitotic divisions called:
a. Cleavage
b. Morulla
c. Blastula
d. Gastrulation
21. The shell, over chick egg is secreted as it passes through:
a. Uterus
b. Ovary
c. Cloaca
d. Oviduct
22. During gastrulation the blastoderm splits into two layers,an upper layer of cells is called:
a. Epiblast
b. Hypoblast
c. Area Opaca
d. Area pellucida
23. The cavity formed between somatic and splanchnic mesoderm is:
a. Coelom
b. Archenteron
c. Neurocoel
d. Hensen’s node
24. Hatching period of chick is:
a. 21 days
b. 15 days
c. 28 days
d. 8 days
25. Somites are formed and organized by:
a. Endoderm
b. Ectoderm
c. Blastoderm
d. Mesoderm