Practice free Growth and Development in Plants (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
From where auxin was isolated for the first time ?
Auxin was first isolated from human urine. The discovery was made by F. W. Went in the 1920s. He identified the growth-promoting substance in the tips of oat coleoptiles and later found that the same substance was present in human urine.
Which of the following should be used for the control of weeds in farms ?
Auxins are commonly used as herbicides to control weed growth. Synthetic auxins like 2,4-D and MCPA mimic the natural auxin hormone in plants, which disrupts the normal growth processes in weeds, leading to their death.
Which of the following organic substance is growth inhibitor ?
Abscisic acid (ABA) is an organic substance known to act as a growth inhibitor. It plays a crucial role in processes such as seed dormancy and stomatal closure under stress conditions like drought.
From where indole acetic acid an organic substance was isolated for the first time ?
Indole-3-acetic acid (IAA), a type of auxin, was first isolated from human urine. This discovery was significant as it identified a natural plant hormone in a biological sample, highlighting its role in plant growth and development.
Cytokinin is formed in which of the following region ?
Cytokinins are a class of plant hormones that promote cell division (cytokinesis) in plant roots and shoots. They are primarily found in regions of active cell division, such as meristematic tissues.
Drooping of fruit, after fruit maturation (ripening) shows
The drooping of fruit after maturation is typically due to a decrease in the amount of auxin. Auxins are hormones that promote cell elongation and growth; a reduction in their levels can lead to the weakening of cell walls and subsequent drooping.
Which of the following is mismatched statement for effect of auxin ?
Which hormone is essential for initial growth of root ?
Indole-3-butyric acid (IBA) is a type of auxin that is essential for the initial growth of roots. It promotes root initiation and development, making it crucial for the early stages of root growth.
Which is the specific use of synthetic auxin in higher concentration ?
Synthetic auxins, such as 2,4-D, are used as herbicides (weedicides). When applied in higher concentrations, they promote uncontrolled growth leading to the death of the plant, which is why they are effective as weed killers.
Which of the following organic chemical is synthetic ?
2,4-D (2,4-Dichlorophenoxyacetic acid) is a synthetic auxin, which is a type of plant growth regulator. It is widely used as a herbicide. The other options like IAA (Indole-3-acetic acid), GA (Gibberellic acid), and IBA (Indole-3-butyric acid) are naturally occurring plant hormones.
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