In plant physiology, the 'Guttation' is the process by which water is exuded from the plant in liquid form. This typically occurs from specialized structures at the leaf margins called: MCQ with Answer and Explanation
In plant physiology, the 'Guttation' is the process by which water is exuded from the plant in liquid form. This typically occurs from specialized structures at the leaf margins called:
A. Nectaries
B. Lenticels
C. Hydathodes
D. Stomata
Answer: Option C
Solution (By JKExamLibrary)
Guttation is the exudation of water in liquid form from the intact, uninjured surfaces of plants, typically from the margins or tips of leaves. This occurs when root pressure is high (usually at night or early morning when transpiration is low and soil moisture is high) and the rate of water absorption exceeds the rate of transpiration. The water is forced out through specialized structures called hydathodes (or water stomata), which are located at the leaf margins and lack the mechanism to close like regular stomata.
Explanation:
Cloning produces genetically identical copies of an organism or cell. In animals, somatic cell nuclear transfer (like Dolly the sheep) is used. Plant cloning occurs via vegetative propagation or tissue culture. Hybridization combines different genomes; mutation breeding induces mutations; cross breeding involves mating. Cloning has applications in therapeutics, conservation, and agriculture.
Explanation:
Australopithecus (e.g., 'Lucy') is considered one of the earliest direct ancestors or a very close relative of the genus Homo. They were bipedal hominins who lived in Africa about 4 to 2 million years ago. Dryopithecus and Ramapithecus are earlier ape-like ancestors. Homo neanderthalensis was a close relative but is generally considered a separate species that went extinct, though some interbreeding occurred.
Explanation:
Chlorella and Spirulina (a cyanobacterium) are used as single-cell proteins and health supplements due to their high protein content (up to 60%) and essential nutrients. Gelidium is used for agar, Sargassum is a brown alga, Polysiphonia a red alga. Chlorella is a unicellular green alga.
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