Qia) Name the following
(1x 10 = 10 marks)
1) Which Phylum animals are called sea Walnuts
2) Which organelle maintains turgidity of the cell
3) Name the unit which consists of a sugar phosphate and a base
4) Which phase of cell division does synapses take place
5) What is arrangement of sepals called with respect to the members of the same whorl
6) Perichondrium is absent in which connective tissue
7) Name the process that converts solar energy into food
8) Where does carbon fixation take place and plants
9) On what does the respiratory quotient depend upon
10) Give another name for the cellular respiration that does not involve oxygen at all
Answers
Answer:
A-1 Sea walnut, any member of a common genus (Mnemiopsis) of gelatinous, planktonic marine invertebrates of the order Lobata (class Tentaculata, phylum Ctenophora).
A-2 Vacuole is an organelle which maintains the turgidity and rigidity of mature plant cell.
A-3 Nucleotides are composed of three sub-unit molecules: a nitrogenous base, a five-carbon sugar (ribose or deoxyribose), and at least one phosphate group.
A-4 Synapsis (also called syndesis) is the pairing of two chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them. Synapsis takes place during prophase I of meiosis.
A-5 The mode of arrangement of sepal or petals in a floral bud with respect to the other members of same whorl is known as aestivation
A-6 Hyaline and elastic cartilage are surrounded by a connective tissue capsule called the PERICHONDRIUM that contains the capillaries from which the nutrients diffuse into the cartilage matrix. Articular hyaline cartilage and fibrocartilage do not have a perichondrium.
A-7 In photosynthesis, solar energy is harvested and converted to chemical energy in the form of glucose using water and carbon dioxide. Oxygen is released as a byproduct.
A-8 The Calvin cycle fixes carbon in the chloroplasts of plants and algae, and in the cyanobacteria. It also fixes carbon in the anoxygenic photosynthesis in one type of proteobacteria called purple bacteria, and in some non-phototrophic proteobacteria.
A-9 The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of CO2 and O2 are evolved and consumed, respectively
A-10 Anaerobic respiration is a normal part of cellular respiration. Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation.
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