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Chapter 15 Plant Growth and Development Solutions

Question - 11 : -
What would be expected to happen if:
(a) GA3 is applied to rice seedlings
(b) dividing cells stop differentiating
(c) a rotten fruit gets mixed with unripe fruits
(d) you forget to add cytokinin to the culture medium.

Answer - 11 : -

(a) The coleoptile will elongate rapidly, as GA3 helps in cell growth.
(b) The development of callus (mass of undifferentiated cells) will take place.
(c) The unripe fruits will ripe quickly because of the increased rate of respiration due to emission of ethylene from rotten fruit.
(d) Cell division will retard and shoot will not initiate from the callus.

Question - 12 : -

Calculate the molecular mass of the following:

(i) H2O (ii) CO2┬а(iii)CH4

Answer - 12 : -

(i)┬аH2O:

The molecular mass of water, H2O

= (2 ├ЧAtomic mass of hydrogen) + (1 ├Ч Atomic mass of oxygen)

=[2(1.0084) + 1(16.00 u)]

= 2.016 u +16.00 u

= 18.016

= 18.02 u

(ii)┬аCO2:

The molecular mass of carbon dioxide, CO2

= (1 ├ЧAtomic mass of carbon) + (2 ├Ч Atomic mass of oxygen)

= [1(12.011u) + 2 (16.00 u)]

= 12.011 u+ 32.00 u

= 44.01 u

(iii)┬аCH4:

The molecular mass of methane, CH4

= (1 ├ЧAtomic mass of carbon) + (4 ├Ч Atomic mass of hydrogen)

= [1(12.011u) + 4 (1.008 u)]

= 12.011 u+ 4.032 u

= 16.043 u

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