Question

(6) 164
(vii) Soil atmosphere.
(viii) Soil texture.
4. Short Answer Type Exercises
Tick mark(V) the correct answer.
1. The knowledge of chemistry was used for improvement of agriculture during-
(a) end of 17th century
century
(6719h century
(d) 20 century
2. Water was an essential element for growth of plant showed by-
(a) Walter
(b) Glauber
(c) Schubler
(d) Mattson
3. Nitre was more essiential than water for principle of vegetation , proved by -
(a) Glauber
(b) Wallerius
(c) DJ Hissink
(d) Thomas
4. The worth of humus as the main source of plants food was proved by -
(a) Wallerius
(b) Schubler
(c) Sawsslove
(d) Gedroiz
5. The role of oxygen and carban dioxide in the growth of plants was demonstrated by-
(a) Saussuse
(b) Glauber
(c) Van Helmont
(d) Liebig
6. The importance of physical properties of soils in the growth of plants was recognised by-
(a) Davg and Schubler
(b) K.K. Gedroiz
(c) Stevensen
(d) Samuel Johnson
7. The adsorption of ions was reversible in soil due to base exchange process found by-
(a) Samuel Johnson
(b) Skinner
(c) Weigner
(d) Linus Pauling
3​

Answer 1

Answer:

Explanation:

1. 19h century

2.water

3.c) DJ Hissink

4.Schubler

5.Van Helmont

6.(c) Stevensen