The branch of biology dealing with the study of algae is called:
A. Phycology
B. Pteridology
C. Bryology
D. Mycology
Answer: Option A
Solution (By JKSSB Mock Tests)
Phycology (algology) is the study of algae, which are photosynthetic eukaryotic organisms ranging from unicellular to multicellular forms. Mycology deals with fungi, bryology with mosses and liverworts, and pteridology with ferns. Algae include green algae, red algae, brown algae, and diatoms, and are important primary producers in aquatic ecosystems.
Consider the following statements about the carbon cycle:
1. Photosynthesis removes CO₂ from the atmosphere.
2. Respiration and combustion return CO₂ to the atmosphere.
3. Decomposition releases CO₂.
Which of the above is/are correct?
Consider statements about genetics: 1. A gene is a segment of DNA that codes for a protein. 2. Alleles are alternative forms of a gene. 3. The phenotype is the genetic makeup of an organism. Which are correct?
Explanation:
A gene is a specific sequence of nucleotides in DNA that serves as the fundamental unit of heredity, typically coding for a specific protein or RNA molecule. Alleles are different versions or alternative forms of the same gene that occupy the same locus on homologous chromosomes and determine variations in a trait. The genotype is the genetic makeup of an organism, while the phenotype is the observable physical or biochemical characteristics. Thus, statements 1 and 2 are correct.
Explanation:
Whittaker's five-kingdom system places all prokaryotes (bacteria, cyanobacteria, archaea) in Monera. They lack a true nucleus and membrane-bound organelles. Protista has unicellular eukaryotes, Fungi and Plantae are multicellular eukaryotes (except yeast). Monera reproduces asexually mainly by binary fission.
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