MCQs from CBSE Class 9 Science Chapter 6: Tissues 1. Diagrammatically show the difference among three types of muscle fibres. Participate in learning and knowledge sharing. They act as lungs. (i) The blood from the heart is transported to all parts of the body by the ________. NCERT Solutions for Class 9 Science Tissues part 2 Class 9 Science book solutions are available in PDF format for free download. (ii) Evaporation of water from the leaf surface occurs through the stomata. Answer: (i) The epidermis of plants living in dry habitats may be thicker or often secrete a waxy, water-resistant layer on their outer surface called cutin (chemical substance with waterproof quality) to prevent water loss. These pores are called stomata. When the stomata are present on both sides of the leaf, they are called amphistomatic; epistomatic, if present on the upper side; and hypostomatic, if present on the lower side. It helps in the transpiration of water, i.e., the loss of excess water from the plant. The guard cells control the opening and the closing of the stomata. Evaporation of water from the leaf surface occurs through the stomata. Functions of the stomata: (i) They allow the exchange of gases (CO2 and O2) with the atmosphere. Get chapter notes for CBSE Class 9 Science, chapter 6: Tissues (Part-I). Stoma (plural stomata), a word derived from Greek which means ‘mouth’, is a pore found in the epidermis of leaves, stems and all other plant parts found above the ground. It occurs only when the concentration of the diffusing substances is not uniform. The major function of stomata is the exchange of gases by taking carbon dioxide from the atmosphere and giving out oxygen that is used by human beings and animals. Stomata are small holes or openings present on the leaf surface in epidermis. Answer: The layer of oily substance will close the stomata present in leaves and this would decrease the rate of transpiration. As the plant takes water from the soil, the openings absorb other minerals. Functions of the stomata They allow the exchange of gases (CO2 and O2) with the atmosphere. As such, guard cells play a crucial role in photosynthesis by regulating the entry of materials necessary for the process. Sample papers, board papers and exam tips. We have received your request successfully. Stomata: Some minute pores which are usually, found in leaf for the exchange of gas and transpiration are known as stomata (singular stoma). ... What are the functions of the stomata? What are the examples of simple and complex tissue? ch 6 class 9 - 5591691 Hey, Stomata are the small pores in leaves of plants. In the case of floating plants, stomata is found only on the upper epidermis. Once this happens, pressure is developed that forces the roots to absorb water from the soil and transfer it to the tips of the plant. 2. In dicot plants the number of stomata is greater on the lower surface than on the upper surface of the leaf. The loss of excess water in the form of water vapour. As epidermal cells, they play an important role in gaseous exchange in and out of plant leaves by regulating the opening and closing of pores known as a stoma. They help in photosynthesis and transpiration. Anomocytic Stomata. These openings are surrounded with guard cells. Stomata are found on either both sides or on just one side of the leaf. Fill in the blanks. In addition, they are the channels through which water is released from leaves to the environment. This keeps the plant cool and transfers minerals and other materials to different parts of the plant. Essentially, guard cells are two bean-shaped cells that surround a stoma. 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