A. The increased biomass in the sunlit dish came from the carbon and oxygen atoms present in the carbon dioxide it took up during photosynthesis that it used to synthesize organic molecules.
Plants use photosynthesis in order to convert light energy (from the sun) into chemical energy, stored in carbohydrate molecules (such as sugars). This chemical energy can be further transformed to fuel some of the organism's activities. This chemical reaction (photosynthesis) is light-dependent and includes the use of carbon dioxide and water to produce sugars and oxygen. The seeds that were put on a sunny windowsill had plenty of light energy needed for their photosynthetic activity. This resulted in the accumulation of sugar molecules in the plant tissues and an increase in the biomass. These sugar molecules were synthesized by the carbon and oxygen atoms comprising the carbon dioxide molecules absorbed during photosynthesis.
B. The most likely explanation for the why the dark-grown seedling lost biomass is that cellular respiration in the cells of the seedlings consumed the starch and oils present in the seed as sources of energy.
Plants use cellular respiration in order to constantly supply energy to their cells. This chemical reaction uses the sugar molecules produced by the photosynthesis and stored in the plant tissues to get energy. Seeds put in a dark cupboard did not have access to any light energy, therefore, they could not perform photosynthesis. As a result, they had to perform respiration and consume starch and oils which were present in the seed to get the necessary energy. This resulted in a reduction in their biomass.
Fructose-1, 6-bisphosphatase is activated in response to a glucagon signal.
<h3>What is the purpose of Glucagon signals?</h3>
- Glucagon signals specify that fuel molecules are required in the bloodstream.
- So these signals activate Fructose-1, 6-bisphosphatase (F1, 6BP) so as to increase the level of sugar and other fuels required for production of energy.
- In the process of gluconeogenesis, new glucose molecules are synthesized from other non carbohydrate sources.
- As glucose is required in the bloodstream so F-1, 6BP should be activated as it acts as a rate limiting enzyme in gluconeogenesis.
- Gluconeogenesis occurs when the dietary intake of glucose is very low.
- Glucose is required as a source of energy by almost all body cells so in case of less oxygen it is synthesized from other molecules like amino acids.
Learn more about gluconeogenesis here:
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Answer/Explanation:
Onions are stem modifications of bulbs. Onions grow during a cold weather, but forms bulbs when the weather is warm. Onions can either be grown using seeds or through their bulbs. That is why, the stem modification of onions are bulbs. Tuber is from potatoes, whereas corm is from crocuses and gladioli.
Answer:
C. The brain controls the contraction of muscles.
Explanation:
Calcium's positive molecule is important to the transmission of nerve impulses to the muscle fiber via its neurotransmitters triggering release at the junction between the nerves. Inside the muscle, calcium facilitates the interaction between actin and myosin during contraction.
