In sunflower, the arrangement of leaves on the stem is: MCQ with Answer and Explanation

In sunflower, the arrangement of leaves on the stem is:
A. Opposite
B. Basal rosette
C. Alternate
D. Whorled
Answer: Option C
Solution (By JKSSB Mock Tests)
Phyllotaxy is the pattern of leaf arrangement on the stem. In sunflower (and many other plants like mustard), the phyllotaxy is alternate, meaning a single leaf arises at each node. In opposite phyllotaxy (e.g., guava), two leaves arise at a node, and in whorled (e.g., Nerium), more than two leaves arise at a node.

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Practice More Biology Questions

Question #1
The process of 'Southern blotting' is a technique used in molecular biology to detect:
A. Lipids in a cell membrane
B. Specific DNA sequences in a sample
C. Specific RNA sequences in a sample
D. Specific proteins in a sample

Correct Answer: Option B


Explanation:
Southern blotting, named after its inventor Edwin Southern, is a laboratory method used to detect specific DNA sequences in a complex DNA sample. The process involves digesting DNA with restriction enzymes, separating the fragments by gel electrophoresis, transferring (blotting) them onto a nylon or nitrocellulose membrane, and then hybridizing the membrane with a labeled, complementary DNA or RNA probe. Northern blotting detects RNA, and Western blotting detects proteins.

This question belongs to: Science Biology
Question #2
The scientist who developed the first successful heart-lung machine was:
A. Michael DeBakey
B. John Gibbon
C. Christiaan Barnard
D. Willem Kolff

Correct Answer: Option B


Explanation:
John Gibbon developed the heart-lung machine and performed the first successful open-heart surgery using it in 1953. Barnard did first heart transplant.

This question belongs to: Science Biology
Question #3
The enzyme that breaks down starch into sugar in the mouth is:
A. Amylase
B. Pepsin
C. Trypsin
D. Lipase

Correct Answer: Option A


Explanation:
Salivary amylase (ptyalin) initiates starch digestion in the mouth, hydrolyzing starch to maltose. Pepsin digests proteins, lipase fats.

This question belongs to: Science Biology