General Science
7th Class
Chapter 1
Plant Systems
Questions
1.1 Encircle the correct option.
(i) Water and dissolved salts are conducted from roots to leaves by:
a. root hairs b. xylem c. phloem d. stomata
(ii) The innermost layer of cortex in the root:
a. epidermis b. endodermis c. pericycle d. cambium
(iii) What is required for photosynthesis in addition to light?
a. oxygen and carbon dioxide b. oxygen and water
c. carbon dioxide and water d. nitrogen and water
(iv) Oxygen and ________ are the products of photosynthesis:
a. water b. carbon dioxide c. glucose d. chlorophyll
(v) The products of respiration are carbon dioxide and:
a. water b. oxygen c. mitochondria d. chloroplast
(vi) The loss of water from aerial parts of the plants:
a. respiration b. photosynthesis c. evaporation d. transpiration
(vii) Chlorophyll is present in:
a. mesophyll cells b. upper epidermis c. lower epidermis d. endodermis
(viii) Mineral required in the formation of chlorophyll:
a. iodine b. iron c. phosphorus d. magnesium
(ix) The force between the molecules of water:
a. adhesive force b. cohesive force c. repulsive force d. magnetic force
(x) Rate of transpiration decreases with the increase of:
a. temperature b. light intensity c. humidity in air d. wind speed
1.2. Write short answers.
i. What is primary root?
Ans.
The initial root which grows from radicle of the embryo is the primary root or also called as tap root.
ii. What is secondary root?
Ans.
The branches of primary roots are called secondary roots.
iii. State the function of root cap.
Ans.
Root cap protects the newly born soft cells from being damaged and environmental stresses. It enables root tip to grow through soil.
iv. Write word equation for photosynthesis.
Ans.
Carbon dioxide + Water + Sunlight energy → Food (Glucose) + Oxygen
v. Write word equation for respiration.
Ans.
Food (Glucose) + Oxygen → Carbon dioxide + Water + Chemical energy
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