Answer:
Photosynthesis is the process through which green plants (mainly) transform solar energy into useful chemical energy. Plants require energy to grow, reproduce, and defend themselves. Excess photosynthetic energy is stored in plant tissue as starch. Starch is a powdery white material. It stores glucose, which plants utilize for energy. The presence of starch in a leaf is conclusive proof of photosynthesis. This is due to the fact that starch production necessitates photosynthesis.
Explanation:
1. Place one of the plants in a dark room for 24 hours; place the other one on a sunny windowsill.
2. Wait 24 hours.
3. Fill the beaker or jar with ethyl alcohol.
4. Place the beaker or jar in a saucepan full of water.
5. Heat the pan until the ethyl alcohol begins to boil.
6. Remove from the heat.
7. Dip each of the leaves in the hot water for 60 seconds, using tweezers. 8. Drop the leaves in the beaker or jar of ethyl alcohol for two minutes (or until they turn almost white).
9. Set them each in a shallow dish.
10. Cover the leaves with some iodine solution and watch.
The hot water kills the leaf, while the alcohol degrades the chlorophyll, removing the leaf's green hue. When iodine is applied to the leaves, one will turn blue-black and the other will turn reddish-brown. Iodine is a starch indicator that becomes blue-black when it comes into contact with it. The leaf that was exposed to light turns blue-black, indicating that it has been photosynthesising and making starch.
Answer:
The correct answer will be option-A
Explanation:
Habitat fragmentation is the process by which the large habitat is divided into many smaller habitats. The fragmentation of habitat directly affects the species and community structure of a habitat.
In the given case, the cowbird nests which lays eggs in the nests of other birds has increased in the eastern and northern United States. The number of such cases has increased due to the reduction in the wood as a result of the habitat fragmentation due to any natural or man-made activities.
Thus, option-A is the correct answer.
The crayfish have its nerve cord on the ventral side rather than on the dorsal side. The ventral side is under the Crayfishes' exoskeleton, as opposed to the dorsal side where the exoskeleton is . If it is attacked it will be from the dorsal side and the nerve cord would be snapped easier. The function of the nerve cord is that if it gets attacked by a predator they will go for the top and it will still be able to move.
