plants form and function class 6th quesans.pptx

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1. PLANT- FORMS AND FUNCTIONS Book exercises class – vi

2. CHECK POINT - 1 True / False: R addish and turnip are biennial plants. True G rasses are non flowering plants. False M int plant is a creeper. True B ougainvillea has woody stems. True

3. CHECK POINT - 2 A nswer the following questions: 1. W hat are the characteristics of roots? Ans- Roots are non green under ground parts of a plant. -They develop from radicle of the seed. -They grow towards soil and water. -They grow away from sunlight. -They do not have nodes and internodes. -They have many lateral branches called secondary and tertiary roots. 2. N ame atleast two plants which have fibrous roots? Ans- M aize and wheat

4. CHECK POINT - 2 3. I n which plant roots are modified to store food? Ans- Radish, turnip, beetroot, carrot 4. W hat are prop roots? Ans- The rope like roots which grow from the horizontal branches of Banyan and Rubber trees are called prop roots. They support the heavy branches of the trees.

5. CHECK POINT - 3 A nswer the following questions:- The plant part which bears leaves , flowers and fruits - Stem M odified stem of onion - Bulb T he buds on potato - Eyes Thread like structures in grapevine - Stem tendrils

6. Fill in the blanks 1. The ___________ forms the middle axis of a leaf. (midrib) 2. T he flattened part of the leaf is called _________ . (lamina) 3. T he stalk of flower is called _______. (pedicel) 4. T he transfer of pollen grains from anther to the stigma is called ______. (pollination ) CHECK POINT - 4

7. A. Tick the correct answer Which of the following is the herb? Rose Bougainvillea Mustard Bamboo 2. Which of the following has stilt roots? Radish Sugarcane Turnip Carrot

8. A. Tick the correct answer 3. Which of the following is not a modified stem? Radish Potato Ginger Corm 4. Which of the following is not the function of leaves? Loss of excess water by transpiration Absorption of water Respiration Photosynthesis

9. A. Tick the correct answer 5. Pattern of distribution of veins in the lamina is called Venation Transpiration Pollination Fixation 6. Green leaves that protects the floral parts in bud stage are called Petals Sepals Leaves Scale leaves

10. b. Match the columns : COLUMN A Tap roots Stilt roots Fibrous roots Loss of excess of water from plants Leaves modified into spines COLUMN B Maize plant (3) Radish (1) Cacti (5) Maize and sugarcane (2) Transpiration (4)

11. C. Very Short Answer Type Questions 1. Which part of potato plant stores food ? Ans- Underground stem (tuber). 2. Give one example each of leaf tendril and stem tendril. Ans- Pea ; Grapevine 3. Name a plant in which leaf is modified into tendril . Ans- Pea 4. What is the function of spines ? Ans- Spines prevent the loss of water due to transpiration and also protect the plant from grazing animals . 5. Name the whorl of the flower which attracts insect for pollination . Ans- Corolla (petals).

12. Short Answer Type Questions 1. Give main difference between herbs and shrubs ? Ans- Herbs are small plants with soft green stem , less than a metre high. F or example- balsam , sweet pea etc. S hrubs are medium sized woody plants , about 1 – 3 metres high. F or example ; rose , lemon etc. 2. D ifferentiate between tap roots and fibrous root. Ans- A tap root has primary root which is long and thick; branches into secondary and tertiary roots and grows vertically downwards in the soil . F or example; mango , carrot , etc. I n fibrous root, primary is short – lived and is replaced by a cluster of fibre – like root. F or example, maize , wheat , grass , etc.

13. Short Answer Type Questions 3. D efine fertilisation? Ans- T he fusion of male gamete with the female gamete is called fertilisation. 4. What are pollen grains? Where are they formed? Ans- P ollen grains are male reproductive structures of plant that contain male gametes . T hey are formed in anthers of flower. 5. Give some example of plants in which stem stores food ? Ans-Potato , ginger , zimikand etc. 6. W hich part of a plant conducts food and water to different parts of it ? Ans- Stem .

14. Long Answer Type Questions 1. Describe specialized function of the stem? Ans-(a) -stem of some plants such as cactus becomes green and makes food for the plant. (b) S tem of potato , ginger , turmeric etc. modifies and stores food for the plant to grow in the next season. (c) S ome branches of weak stem of grapevine and passion flower change into thread – like structure called stem tendril. T hey support the plant to stand erect. (d) S tem of rose , lemon , bougainvillea etc. bear thorns to protect the plant from grazing animals.

15. Long Answer Type Questions 2. Why is stem in cacti green and fleshy? Ans- The leaves of cacti change into spines to prevent the water loss. To carry out the function of leaves and to store water , the stem becomes green and fleshy. 3. Define pollination. Explain the types of pollination? Ans- The transfer of pollen grains from the anther to the stigma is called pollination. It is of two types: Self pollination:- when the pollen grains from the anther of a flower are transferred to the stigma of the same flower or to the stigma of another flower on the same plant , it is called self pollination. Cross pollination:- when the pollen grains from the anther of the flower of one plant are transferred to the stigma of the flower of another plant of the same type through different agencies such as wind , water , insects , etc. it is called cross – pollination. .

16. Long Answer Type Questions 4. H ow does a plant give rise to fruit? E xplain the process involved. Ans- A plant gives rise to fruit after fertilisation when petals , sepals and stamen fall off and ovary grows into a fruit. 5. D raw and describe the different parts of a leaf. Ans- T he leaf has following parts: Leaf base – A leaf is attached to the stem with its leaf base. P etiole – It is the stalk of the leaf. I t connects the leaf blade with the leaf base. L amina or leaf blade – It is the green , flat and expanded part of the leaf . M idrib and veins – It is the extension of petiole into the lamina. I t divides into many lateral branches called veins. S tomata – these are tiny pores on the surface of leaves which can be seen only under a microscope.

17. Long Answer Type Questions 5. D raw and describe the different parts of a leaf. Diagram of the leaf

18. Hots questions 1. P otatoes are formed underground. H ow do they contain starch when photosynthesis occurs in the green leaves above the ground? Ans – Potato is a modified underground stem. The food formed by green leaves of potato plant is transported to the underground stem and is stored there in the form of starch. 2. Out of two plants one has fibrous roots and another has tap roots. How will you distinguish monocot and dicot plants? Ans – The plant which has fibrous roots is a monocot plant , whereas the one which has tap roots is a dicot plant.