Free Objective Test 02 Practice Test - 11th and 12th
Question 1
In plants, the primary growth is due to the activity of ________.
Intercalary meristem
Lateral meristem
Apical meristem
Cambium
SOLUTION
Solution : C
Primary growth in plants is due to apical meristems (root and shoot apical meristems)
Question 2
In plants, the primary growth is due to the activity of ________.
Intercalary meristem
Lateral meristem
Apical meristem
Cambium
SOLUTION
Solution : C
Primary growth in plants is due to apical meristems (root and shoot apical meristems)
Question 3
Cork Cambium is
Primary and apical meristem
Secondary and apical meristem
Primary and lateral meristem
Secondary and lateral meristem
SOLUTION
Solution : D
Cork cambium (phellogen) is a secondary and lateral meristem.
Question 4
Cork Cambium is
Primary and apical meristem
Secondary and apical meristem
Primary and lateral meristem
Secondary and lateral meristem
SOLUTION
Solution : D
Cork cambium (phellogen) is a secondary and lateral meristem.
Question 5
Coconut milk factor is a/an ______.
Auxin
Gibberellin
Abscisic acid
Cytokinin
SOLUTION
Solution : D
Coconut milk factor is a cytokinin. Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk.
Question 6
Coconut milk factor is a/an ______.
Auxin
Gibberellin
Abscisic acid
Cytokinin
SOLUTION
Solution : D
Coconut milk factor is a cytokinin. Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk.
Question 7
Genetic dwarfness in some plants may be solved by treatment with:
Ethylene
Gibberellins
Auxins
Anti gibberellins
SOLUTION
Solution : B
Genetic dwarfism is solved by the usage of gibberellins. Ethylene is a gaseous hormone, which induces ripening in unripe fruits. ABA cause ageing and abscission of leaves.
Question 8
In
SOLUTION
Solution : The increase in growth per unit time is called growth rate. In arithmetic growth after mitotic cell division, one daughter cell continue to divide and the other cell differentiates and matures.
Question 9
Number of mitotic divisions required to produce 100 cells by arithmetic growth from single cell is
SOLUTION
Solution : C
In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures.
N =100, N = n+1100 = n+1
n =99
Question 10
Growth in plants _______.
SOLUTION
Solution : C
In plants, new cells are always being added by the activity of meristems to the body. This is called open form of growth.
Question 11
Which process is not involved in the development of grain into a mature wheat plant?
SOLUTION
Solution : D
Meiosis occurs during the reproductive phase and not during the development of the grain. Mitosis in the cells of such root and shoot apical meristems leads to increase in the number of cells. 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 differentiation. The plant cells grow in size by cell enlargement which in turn requires water. Turgidity of cells helps in extension growth.
Question 12
Which of the following is caused by gibberellins?
SOLUTION
Solution : A
Bolting (internode elongation) just prior to flowering in cabbage is a test for gibberellin. Gibberelin helps in stem elongation.
Question 13
Apical dominance means ______.
SOLUTION
Solution : B
In most higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called apical dominance.
Question 14
Coiling of garden pea tendrils around any support is an example of
SOLUTION
Solution : C
Thigmotropism is the movement due to contact with a foreign body. In twinners and lianas, there is less growth on the side of contact and more growth on the branch away from the contact. Coiling of garden pea tendrils around any support is an example of thigmotropism.
Question 15
A sleep movement in plants is a nastic response, that occurs daily in response to ____.
SOLUTION
Solution : D
Sleep movement is known as nastic response, this occurs daily in the response to some stimulus either day, night, temperature, pH, turgor pressure, etc.