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3. How will you show that during
photosynthesis green plants give out oxygen :
4. Demonstrate an experiment to show that
light is an essential condition for plants to
make their own food.
5. Describe the mode of nutrition in
Nepenthes.
Answers
3. Experiment to show that oxygen is produced during photosynthesis - definition. Place water plant in a beaker containing pond water. ... A glowing splinter bursts into the flame shows the presence of oxygen.
4. Experiment to show that sunlight is necessary for photosynthesis - definition
Take a plant with destarched leaf.
Leaf is partially covered with black paper on which a design is cut.
Expose this plant to sunlight for few hours and perform a starch test with iodine solution.
5.Pitcher plant has partial heterotrophic mode of nutrition. It performs photosynthesis. To meet its nitrogenous requirement it feeds on insects since pitcher plant grows in nitrogen deficient soil. In a pitcher plant, the leaf is modified to form a pitcher like structure.Sep 10, 20
Answer:
EXPERIMENT: TO SHOW THAT OXYGEN IS PRODUCED DURING PHOTOSYNTHESIS
To prove : oxygen is produced during photosynthesis following steps need to do
Place water plant in a beaker containing pond water.
Cover the plant with short stemmed funnel.
Invert the test tube full of water and cover the stem of the funnel.
While placing the test tube, ensure that the level of the water in beaker is above the level of stem of funnel.
Expose the apparatus to the sunlight.
After few hours, gas bubbles will form and collect in the test tube.
Test the gas in the test tube.
A glowing splinter bursts into the flame shows the presence of oxygen.
Observation: Gas bubbles in a test tube.
Result: Presence of oxygen.
Conclusion: Formation of gas bubbles prove that oxygen is produced by the green plants during photosynthesis.
EXPERIMENT :TO SHOW THAT SUNLIGHT IS NECESSARY FOR PHOTOSYNTHESIS - DEFINITION
To prove: the necessity of sunlight in photosynthesis following steps need to do
Take a plant with destarched leaf.
Leaf is partially covered with black paper on which a design is cut.
Expose this plant to sunlight for few hours and perform a starch test with iodine solution.
Observation-
Covered leaf part shows brown colouration.
Exposed leaf shows blue-black colour.
Result: Starch is present in the exposed leaf.
Conclusion: Leaf exposed to sunlight give iodine test, proving that sunlight is necessary for photosynthesis.
Foraging, flying or crawling insects such as flies are attracted to a cavity formed by the cupped leaf, often by visual lures such as anthocyanin pigments, and nectar bribes. The rim of the pitcher (peristome) is slippery when moistened by condensation or nectar, causing insects to fall into the trap. Pitcher plants may also contain waxy scales, protruding aldehyde crystals, cuticular folds, inward and downward pointing (retrorse) hairs, or guard-cell-originating lunate cells on the inside of the pitcher to ensure that insects cannot climb out.[1] The small bodies of liquid contained within the pitcher traps are called phytotelmata. They drown the insect, whose body is gradually dissolved. This may occur by bacterial action (the bacteria being washed into the pitcher by rainfall), or by enzymes secreted by the plant itself. Furthermore, some pitcher plants contain mutualistic insect larvae, which feed on trapped prey, and whose excreta the plant absorbs.[5] Whatever the mechanism of digestion, the prey items are converted into a solution of amino acids, peptides, phosphates, ammonium and urea, from which the plant obtains its mineral nutrition (particularly nitrogen and phosphorus). Like all carnivorous plants, they all grow in locations where the soil is too poor in minerals and/or too acidic for most plants to survive. Pitcher plants supplement available nutrients and minerals (which plants normally obtain through their roots) with the constituents of their insect prey.
Mature plants of Nepenthes lowii attract tree shrews (Tupaia montana), which feed on nectar that the plant produces but also defecate into the pitcher, providing nitrates and other nutrients. The plant and tree shrew have a symbiotic relationship. The rim of N. lowii is not slippery so that tree shrews can easily get in and out; it provides more nectar than other pitcher plants. The shape of the pitcher rim and the position of the nectar ensure that the animal's hindquarters are over the rim while it feeds.[6]
PICTURE IS FOR 1ST EXPIREMENT
