Question:
Assertion (A): Due to the differences in the activity of the cambial ring the amount of secondary xylem is more than secondary phloem in dicot stem.
Reason (R): The cambium forms a narrow band of parenchyma which passes through secondary tissues in the radial direction is called secondary medullary ray.
Assertion (A): Due to the differences in the activity of the cambial ring the amount of secondary xylem is more than secondary phloem in dicot stem.
Reason (R): The cambium forms a narrow band of parenchyma which passes through secondary tissues in the radial direction is called secondary medullary ray.
Show Hint
The vascular cambium activity is unequal, leading to the formation of wood (secondary xylem).
Updated On: Jun 10, 2026
- Both (A) and (R) are correct and (R) is the correct explanation to (A)
- Both (A) and (R) are correct but (R) is not correct explanation for (A)
- (A) is correct (R) is wrong
- (A) is wrong (R) is correct
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Secondary growth in dicot stems involves vascular cambium activity.
Step 2: Meaning
Secondary xylem is produced more than secondary phloem because cambium is more active towards the inner side.
Step 3: Analysis
Both statements are scientifically accurate descriptions of secondary growth structures. However, (R) describes medullary rays, which is not the reason why xylem is produced in greater quantities than phloem.
Step 4: Conclusion
(A) and (R) are correct, but (R) is an independent fact.
Final Answer: (B)
Secondary growth in dicot stems involves vascular cambium activity.
Step 2: Meaning
Secondary xylem is produced more than secondary phloem because cambium is more active towards the inner side.
Step 3: Analysis
Both statements are scientifically accurate descriptions of secondary growth structures. However, (R) describes medullary rays, which is not the reason why xylem is produced in greater quantities than phloem.
Step 4: Conclusion
(A) and (R) are correct, but (R) is an independent fact.
Final Answer: (B)
Was this answer helpful?
0
0
Top AP EAPCET Botany Questions
- Plant that possess characters like ramenta, archegonia, circinate
- Identify the correct pair from the following
A. Golden algae - diatoms
B. Trichodesmium erythrium - Red Sea
C. Kieselguhr - Chrysophytes
D. Red tides of Mediterranean sea - Dinoflagellates - Assertion (A): Fertilization in Cycas is called siphonogamy and zooidogamy.
Reason (R): Male gametes are multiciliate and carried by pollen tube. - Identify the organisms based on their cell wall characteristics such as pseudomurein, mycolic acid, stiff cellulose plates, chitin.
- Find the correct matching
A) Carrot -- Flowers appear from the same point of peduncle
B) Cocos -- Flowers protected by the modified bract
C) Achyranthes -- Flowers appear in the varied lengths of pedicels
D) Cassia -- Flowers appear on the flattened peduncle
View More Questions
Top AP EAPCET Anatomy of Flowering Plants Questions
- Bi-collateral vascular bundles can be found in these plants
A. Smilax zeylanica
B. Lilium candidum
C. Lycopersicon esculentum
D. Withania somnifera - The reason for the similar size of vascular bundles in monocot leaf
- Polyarch and tetrarch vascular bundles generally occur in these
- Select the incorrect statements related to anatomical characters from the following
I) Endodermis is a part of the stele.
II) Endodermis with casparian strips are found in the dicot stem.
III) Bulliform cells are found in the upper epidermis of the isobilateral leaf.
IV) Vascular bundles are open in monocot stems. - Transport proteins which act as control points for solute movement are found in
View More Questions
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions