The type of root system where many roots arise from the base of the stem, as in grasses, is called: MCQ with Answer and Explanation

The type of root system where many roots arise from the base of the stem, as in grasses, is called:
A. Fibrous root system
B. Adventitious root system
C. Taproot system
D. Prop root system
Answer: Option A
Solution (By JKSSB Mock Tests)
Fibrous root systems consist of a dense network of thin, branching roots originating from the stem base, typical of monocots like grasses. Taproot system has a main central root (dicots). Adventitious roots arise from stems or leaves, prop roots are supportive. Fibrous roots are effective in preventing soil erosion.

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Practice More Biology Questions

Question #1
Which of the following statements about the cell is correct?
A. Prokaryotic cells contain mitochondria.
B. The cell is the basic unit of life.
C. Viruses are cells.
D. All cells have a nucleus.

Correct Answer: Option B


Explanation:
The cell theory states that the cell is the fundamental unit of structure and function. Not all cells have a nucleus (prokaryotes), prokaryotes lack mitochondria, viruses are not cells.

This question belongs to: Science Biology
Question #2
Which enzyme is responsible for unwinding the DNA double helix during replication?
A. Ligase
B. Primase
C. DNA polymerase
D. Helicase

Correct Answer: Option D


Explanation:
Helicase unwinds the DNA helix at the replication fork by breaking hydrogen bonds between base pairs. DNA polymerase adds nucleotides, ligase seals Okazaki fragments, primase synthesizes RNA primer. This coordinated action ensures accurate semi-conservative replication. Without helicase, the strands would not separate. Energy for unwinding comes from ATP hydrolysis.

This question belongs to: Science Biology
Question #3
The enzyme used to join DNA fragments in genetic engineering is:
A. DNA polymerase
B. DNA ligase
C. Helicase
D. Restriction enzyme

Correct Answer: Option B


Explanation:
DNA ligase seals the phosphodiester bonds between adjacent DNA fragments, joining them together. In recombinant DNA technology, it is used to ligate the gene of interest into a vector. Restriction enzymes cut DNA, DNA polymerase synthesizes DNA, and helicase unwinds the double helix. Ligase is essential for finalizing the recombinant DNA molecule.

This question belongs to: Science Biology