The process of separation of leaf, flower, or fruit from the plant body is called abscission. It is primarily controlled by: MCQ with Answer and Explanation
The process of separation of leaf, flower, or fruit from the plant body is called abscission. It is primarily controlled by:
A. Ethylene and Abscisic Acid
B. Cytokinin
C. Gibberellin
D. Auxin
Answer: Option A
Solution (By JKSSB Mock Tests)
Abscission is the natural shedding of plant parts. It is primarily promoted by ethylene and abscisic acid (ABA), which stimulate the formation of an abscission zone at the base of the petiole or pedicel. This zone consists of weak-walled cells that break down, causing the part to fall. Auxin, conversely, delays abscission. Exam tip: Ethylene is the 'ripening and shedding' hormone.
Explanation:
Hemoglobin is a red, iron-containing protein in red blood cells (erythrocytes) that reversibly binds oxygen to form oxyhemoglobin. Each molecule has four heme groups, each binding one Oâ‚‚ molecule. Hemocyanin (copper-based) is found in some invertebrates. Myoglobin stores oxygen in muscles. Cytochromes are electron carriers in respiration. Hemoglobin also transports COâ‚‚ as carbaminohemoglobin.
Explanation:
Bt brinjal is a transgenic eggplant (brinjal) developed by inserting the cry1Ac gene from the soil bacterium Bacillus thuringiensis (Bt). This gene codes for a crystal protein that is toxic to the larvae of the brinjal fruit and shoot borer (Leucinodes orbonalis), a major pest that causes significant yield loss. When the insect ingests the plant tissue, the alkaline gut activates the toxin, creating pores in the gut lining and killing the pest.
Consider the following statements about vitamins:
1. Vitamin A is fat-soluble.
2. Vitamin C is water-soluble.
3. Vitamin D can be synthesized in the skin by sunlight.
Which of the above is/are correct?
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