Q: What forms secondary vascular tissues in trees?
Options:
- (A) allow growth
- (B) primary growth
- (C) secondary growth
- (D) In their leaves
- (E) end growth
- (F) mating
- (G) Most plants
- (H) shrub beds
A: So, my chain of thought: Secondary growth forms secondary vascular tissues and bark. All trees have bark. Trees secondary growth forms secondary vascular tissues. The answer is (C).

Q: Which process of gene abnormalities can mutations be detected?
Options:
- (A) A computer
- (B) ligt
- (C) analysis
- (D) radiation
- (E) electrically
- (F) negative
- (G) Microscope
- (H) illness
A: So, my chain of thought: Mutations may change the structure of a chromosome or just change a single nucleotide. Chromosomal abnormalities can be examined by chromosome analysis. Mutations can be detected by analysis on gene abnormalities. The answer is (C).

Q: The mature form of what kind of cell secretes antibodies?
Options:
- (A) more abundant
- (B) it needs them
- (C) positive
- (D) graptolites
- (E) A Greek letter
- (F) barnacles
- (G) B-lymphocytes
- (H) homogenous
A:
So, my chain of thought: Plasma cells are activated B cells that secrete antibodies. Plasma Cells Plasma Cells Plasma cells are the mature form of B-lymphocytes. Mature forms of B-lymphocytes secrete antibodies. The answer is (G).