The process by which water-soluble nutrients are washed out of decomposing organic matter into the soil is called: MCQ with Answer and Explanation

The process by which water-soluble nutrients are washed out of decomposing organic matter into the soil is called:
A. Fragmentation
B. Leaching
C. Humification
D. Catabolism
Answer: Option B
Solution (By JKSSB Mock Tests)
Decomposition involves several steps. Leaching is the process where water-soluble inorganic nutrients (like nitrates, phosphates) are washed out of the decomposing organic matter (detritus) and move deep into the soil profile, where they may become unavailable to plants. Fragmentation is the breakdown of detritus by detritivores (like earthworms).

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Practice More Biology Questions

Question #1
Consider statements about plant reproduction: 1. The anther produces pollen. 2. The ovary develops into the fruit. 3. Self-pollination increases genetic diversity. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 3 only
D. 1 and 2 only

Correct Answer: Option D


Explanation:
The anther is the male reproductive part of the flower where microspores develop into pollen grains. After fertilization, the ovary wall matures and develops into the fruit, enclosing the seeds. Self-pollination involves the transfer of pollen to the stigma of the same flower or plant, resulting in offspring genetically identical to the parent, thus decreasing, not increasing, genetic diversity. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology
Question #2
The 'Foramen of Panizza' is a small opening found in the heart of which animal, allowing blood to bypass the pulmonary circuit?
A. Shark
B. Frog
C. Rabbit
D. Crocodile

Correct Answer: Option D


Explanation:
The Foramen of Panizza is a small opening located between the left and right aortic arches at the base of the heart in crocodilians (crocodiles, alligators). It allows blood to flow between the two systemic arches. During diving, when pulmonary resistance increases, this foramen allows deoxygenated blood to bypass the lungs and enter the systemic circulation, conserving oxygen for vital organs. Frogs have a three-chambered heart without this specific foramen.

This question belongs to: Science Biology
Question #3
Which of the following is a defining characteristic of all Chordates?
A. Ventral nerve cord
B. Exoskeleton made of chitin
C. Presence of a notochord at some stage of life
D. Open circulatory system

Correct Answer: Option C


Explanation:
All chordates, at some point during their larval or adult stages, possess three key features: a dorsal hollow nerve cord, a notochord (a flexible rod supporting the body), and pharyngeal slits. The notochord may be replaced by a vertebral column in vertebrates. Arthropods have a ventral nerve cord and open circulatory system.

This question belongs to: Science Biology