Question
The diagram shows a leaf which has been drawn at a magnification of ×7.
What was the actual length of the leaf?
(A) 11 mm
(B) 14 mm
(C) 19 mm
(D) 98 mm
▶️Answer/Explanation
Ans: B
The correct answer is B, because :
Magnification = (original size) ÷ (actual size)
7 = (98 mm) ÷ (actual size)
actual size = 14 mm
Question
Which part of a leaf contains the highest concentration of chloroplasts?
A lower epidermis
B palisade layer
C upper epidermis
D vascular bundle
▶️Answer/Explanation
Ans B
The correct answer is B, because :
In cross-section of leaf,
- Upper epidermis – its for protection
- Palisade layer – contains chlorophyll, site of major photosynthesis
- Vascular bundle – Its for transport
- Lower epidermis
Based on the above, Palisade layer is region of higher chloroplast concentration.
Question
Which tissue has the function of providing support for a plant?
A. epidermis
B mesophyll
C phloem
D xylem
▶️Answer/Explanation
Ans D
The correct answer is D, because :
Xylem fibres can provide support to the plants whereas,
- Epidermis – gives protection
- Mesophyll – site of photosynthesis
- Phloem – It is responsible for food transport in both directions and structures are not strong enough to provide support
Question
The substances listed are found in the leaf of a plant.
Which substance is obtained from the soil?
(A) carbon dioxide
(B) chlorophyll
(C) glucose
(D) mineral ions
▶️Answer/Explanation
Ans: D
The correct answer is D, because :
Mineral ions are found mineral composition of soil.
- Carbon dioxide is found in air
- Chlorophyll is seen in the palisade mesophyll of leaf
- Glucose is formed by photosynthesis in leaf using carbon dioxide, water in presence of sunlight leading to formation of glucose and oxygen