Biology Most expected Questions series-4
Download link below the page
Disclaimer-: The Questions uploaded on the page are created by our team with help of different books, test paper, Neet previous year test paper and many more for credit or removal Click here
1. Plant growth is unique because :
(a) Plants not retain the capacity for unlimited growth throughout their life.
(b) Plants retain the capacity for limited growth throughout their life.
(c) Plants retain the capacity for unlimited growth throughout their life.
(d) Plants retain the capacity for unlimited growth during some part of their life.
2. Growth is, therefore measured by a variety of parameters which are :
(a) Increase in fresh weight.
(b) Increase in dry weight.
(c) Increase in length, area, volume and cell number.
(d) All of the above.
3. Choose the correct option from given statement:
(a) One single maize root apical meristem can give rise to more than 17,500 new cells per hour, this growth is expressed as increase in cell number.
(b) Whereas cells in a watermelon may increase in size by upto 3,50,000 times, this growth expresses as increase in size of the cell.
(c) Growth of a pollen tube is measured in terms of its length, an increase in surface area denotes the growth in a dorsiventral leaf.
(d) All of the above.
4. The process of growth is determined by :
(a) Increase in size.
(b) Increase in size and dry weight.
(c) Increase in weight only.
(d) Increase in dry weight.
5. Growth is maximum in the zone of :
(a) Cell division
(b) Cell elongation
(c) Cell maturation
(d) All of these.
6. Correct sequence of different stages of development is:
(a) Fruiting - Flowering - Juvenility - Germination.
(b) Germination - Juvenility - Flowering - Fruiting.
(c) Flowering - Fruiting - Juvenility - Germination.
(d) Juvenility - Flowering - Fruiting - Germination.
7. The cells derived from root apical and shoot– apical meristems and cambium differentiate and mature to perform specific functions. This act leading to maturation is termed as :
(a) Differentiation
(b) Dedifferentiation
(c) Redifferentiation
(d) All of these.
8. Development is a term that includes all changes that an organism goes through during the life cycle from :
(a) Germination of the seed to senescence.
(b) Flowering to senescence.
(c) Germination of the seed to maturation.
(d) Germination of the seed to flowering.
9. The S–shaped growth curve and grand period of growth may change with :
(a) Sudden fluctuation in light intensity.
(c) Change in temperature.
(c) Fluctuation in humidity.
(d) It remains unaffected.
10. Growth plotted against time gives a :
(a) Parabolic curve
(b) Sigmoid curve
(c) Upright line
(d) Horizontal line.
11. When the rate of maximum growth is maintained for sometime, it is known as :
(a) J–shaped phase of growth.
(b) Linear phase of growth.
(c) S–shaped phase of growth.
(d) All of these.
12. Which of the following is an adenine derivatives :
(a) ABA
(b) GA3
(c) Kinetin
(d) IAA.
13. Which of the following is a C2H4
(a) ABA
(b) Ethylene
(c) Kinetin
(d) IAA.
14. Which PGR could fit either of the growth promoting or growth inhibiting groups, but it is largely an inhibitor of growth activities :
(a) Ethylene
(b) Gibberellins
(c) Cytokinins
(d) Abscisic acid.
15. Which of the following is a wrong statement :
(a) Auxin was isolated by F.W. Went from tips of coleptiles of oat seedlings.
(b) The 'bakane' (foolish seedling) disease of rice seedlings, was caused by a fungal pathogen Gibberella fujikuroi.
(c) E. Kurosawa reported the apperarance of syptoms of the disease in unifected rice seedlngs when they were treated fungus Gibberella fujukuroi.
(d) Skoog and Miller, identified and crystallised the cytokinesis promoting active substance that they termed dormin.
16. Which of the following is true statement :
(a) Skoog and Miller identified and crystallised the cytokinesis promoting active substance that they termed kinetin.
(b) Three different kinds of inhibitors : inhibitor–B, abscission II and dormin all the three are chemically identical.
(c) Inhibitor–B, abscission II and dormin are called abscisic acid (ABA).
(d) All of the above.
17. The climatic factors which affect growth are :
(a) Light and wind.
(b) Light and temperatre.
(c) Rain and temperature.
(d) Atmospheric humidity and temperature.
18. Growth hormone responsible for apical dominance is
(a) Auxin
(b) Cytokinin
(c) Gibberellin
(d) Ethyelene.
19. Flowering in pineapple is promoted by :
(a) NAA
(b) GA3
(c) Short days
(d) Cytokinin.
20. Who among the following discovered the Avenacurvature test to find out the concentration of auxins :
(a) F.W. Went
(b) L.J. Audus
(c) K.V. Thimann
(d) F. Skoog.
21. Who demonstrated that decapitated Canary grass, seedlings resume phototropic sensitiveness when but tip is pasted back in its position :
(a) Darwin
(b) Paal
(c) Boysen–Jensen
(d) Went
22. Specific property attributed to gibberellins is :
(a) Shortening of genetically tall plants.
(b) Elongation of genetically dwarf plant.
(c) Promotion of rooting.
(d) Yellowing of young leaves.
23. Gibberellins cuase or gibberellins stimulate :
(a) Elongation of internodes.
(b) Curvature of coleoptile.
(c) Cell division.
(d) Initiation of lateral roots.
24. Gibberellin was first extracted from :
(a) Gibberella fujikuroi.
(b) Algae.
(c) Bacteria.
(d) Roots of higher plants.
25. Cytokinins :
(a) Promote abscission.
(b) Influence water movement.
(c) Help retain chlorophyll.
(d) Inhibit protoplasmic streaming.
No comments:
Post a Comment