Title Integrated Series 7th Class Biology - Solutions.pdf ✅

Class 7 – Biology | I - 7 Nutrition in Plants 2 8. Correct option: (A) Leaves Transpiration is the loss of water in the form of water vapor through stomata, cuticles and lenticles. Most of the transpiration occurs through stomata in leaves i.e., 50-90% of total transpiration. 9. Correct option: (A) Urea Urea serves as fertilizers and is a rich source of nitrogen. The urea reacts with the gases present in the soil and is firstly converted into ammonia and then into ammonium. This ammonium is then converted into nitrates and nitrites. Plant leaves turn yellow when there is a deficiency of nitrogen content. Farmers sprinkle urea so that they absorb nitrogen and fulfill its needs. The leaves soon become green again, therefore increasing the rate of photosynthesis. 10. Correct option: (D) All of above Drocera, Utricularia and Venus fly trap are insectivorous plants that feed on insects as well as their larvae. They generally have modified shoots especially for the purpose of capturing and ingesting the insect. 11. Correct option: (B) Parasite Cuscuta also known as Dodder or Amarbel is a genus of parasitic plants which has no chlorophyll, and it absorbs its food and nutrients from its host by wrapping its whole flexible stem around the host plant and absorbing nutrients and stays attached to it until the host dies. 12. Correct option: (A) Roots Parasitic plants and fungi have root-like structures known as Haustorium, that grow into or around another plant and its tissues to absorb water and nutrients from that plant instead of directly taking it from the soil. Parasitic plants like Dodder and Mistletoe have a haustorium as specialized root like appendages projecting out from stem. 13. Correct option: (D) All of them In the process of photosynthesis, Carbon dioxide, CO2 along with Water, H2O in presence of solar energy is converted to sugars, specifically Sucrose and O2 inside the chloroplast present in the leaves of plants. Given below is the reaction. 6CO2+6H2O → C6H12O6+6O2 14. Correct option: (C) Nepenthes Tropical Pitcher plants or Nepenthes is a genus of insectivorous plants that grows in Nitrogen deficient soil and feeds on insects. Nepenthes pitchers produce a lot of sweet nectar to attract insects. 15. Correct option: (A) Sundew Drocera is commonly known as Sundew, that are “flypaper” plants that trap prey in sticky hairs on their leaves. They make up one of the largest groups of carnivorous plants. Long tentacles protrude from their leaves, each with a sticky gland at the tip. These droplets look like dew glistening in the sun, thus their name. 16. Correct option: (B) Stem Lenticels are specialized pores present on the surface of stems/ barks and permit the exchange of gases between the environment and the internal tissue spaces of the organs.