In biennials and perennials, low temperature stimulus is not received by which of the following?
Correct answer: C. Leaves of the plants
- A. Shoot apex of mature stem
- B. Embryo of the seed
- C. Leaves of the plants
- D. All of these
Explanation
Whenever vernalization occurs in the mature plants, the receptor of stimulus is the stem apex and embryo tips. In other words, the meristematic cells in the bud respond to the cold treatment.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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