Biology-Objective Related Question Answers
251. MICRO ELEMENTS means?
The elements which are required by plants in small amounts are called micro - elements. Eg. Mn; Zn; B; Cu; Mo & Cl. They are involved in the functioning of enzymes.
252. The major macro- elements are C; H; O; N; S; P; K; Ca; Mg and Fe ganic food. Such plants are called?
Heterotrophic plants
253. The heterotrophic plants which totally depends on living plants or animals for their food are known as?
Parasites
254. The heterotrophs which depends on dead and rotten organic remains of plants and animals are called?
Saprophytes
255. An association of two dissimilar organisms where both members are benefitted is known as?
Symbiosis
256. Name the two major steps in photosynthesis?
(1) Light reaction; (2) Dark reaction
257. The splitting of water (photolysis) in photosynthesis occurs in which step?
Light reaction
258. Explain PHOTOSYNTHESIS?
It is the process of manufacture of organic compounds from CO2 and H2O in the presence of sunlight as a source of energy. The first step of photosynthesis is light reaction which occurs in the grana of chloroplast. The major process in this step are (1) Photolysis of water and evolution of O2 (2) Photophosphorylation. It is the process of ATP formation from ADP using light energy. The second step is dark reaction; It occurs in stroma of chroloplast. Here CO2 is reduced to carbohydrates; using AT
259. Explain ANTI TRANSPIRANTS?
About 98% of water absorbed by plants on land is evaporated from the aerial parts; through transpiration. Due to this the plant has to face several problems. So the rate of transpiration must to reduced. For this certain substances are used to reduce the rate of transpiration. These are known as antitranspirants. eg : colourless plastics; silicone oils; phenyl mercuric acetate
260. The preparation of organic food by reducing CO2 takes place in which phase?
Dark Phase
261. The most abundant plant pigment in the world?
Chlorophyll a
262. Minimum rate of photosynthesis is found in which colour?
Green
263. The process of break down of food materials within the cell to release energy is known as?
Cellular respiration
264. The organic food that are oxidised during cellular respiration are known as?
respiratory substrates
265. The energy released during respiration is used for the synthesis of ........?
ATP
266. The rate of respiration is measured by?
respirometer
267. Glycolysis takes place in which part of the cell?
Cytoplasm
268. Kreb’s cycle occurs in?
Mitochondria
269. Name the important plant hormones?
Auxins; Gibberellins; Cytokinins; Abscisic acid & Ethylene
270. Which plant hormones are known as growth promoters?
Auxin; Gibberellin; Cytokinin
271. Which plant hormones are known as growth inhibitors?
Abscisic acid and Ethylene
272. The only gaseous plant hormone which promotes fruit growth and ripening is?
Ethylene
273. In plants the adverse enviornmental conditions are overcome with the help of which hormone?
Abscisic acid
274. The plant hormone abscisic acid is also known as ......?
Stress hormone
275. Which plant hormone is known as the ripening hormone?
Ethylene
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