Class 5 Basic Science: Chapter 01 Know The Plants World Closely - Questions and Answers


Study Notes for Class 5th Basic Science (English Medium) സസ്യലോകത്തെ അടുത്തറിയാം | Text Books Solution Basic Science (English Medium) Chapter 01 Know The Plants World Closely. ഈ യൂണിറ്റിന്റെ Teachers Manual & Teachers Handbook എന്നിവയുടെ ലിങ്ക് ഈ പേജിന്റെ അവസാന ഭാഗത്തു നൽകിയിട്ടുണ്ട്.
Know The Plants World Closely - Textual Questions and Answers & Model Questions
1. What is Photosynthesis?
- Photosynthesis is the process by which green plants prepare their food using carbon dioxide water minerals in the presence of sunlight.

2. Autotrophs
- Plants prepare their own food and are hence known as autotrophs

3. Stomata
- Plants absorb carbon dioxide and release oxygen during photosynthesis this gaseous exchange takes place through small pores in the leaves. These pores are called stomata. They also release water from plants into the atmosphere.

4. Chlorophyll
- The green Coloured pigment seen in plants is chlorophyll. Chlorophyll absorbs the sunlight needed for photosynthesis. It is present more in the leaves.

5. What are pigments?
• Pigments give colour to leaves, stems, flowers and fruits.
• Hence leaves with the pigment xanthophyll appear yellow in colour, those with carotene appear yellowish-orange and those with anthocyanin appear red in colour.

6. Observe the picture and answer the given questions.

i. Do plants release only oxygen at all times?
ii. Is photosynthesis possible at night? Why?
iii. What is the process that takes place during the day and the night in all
organisms, including plants?
Answer:
i. No, When green plants carry out photosynthesis during the daytime, carbon dioxide is absorbed and oxygen is released. Since photosynthesis does not take place at night oxygen is not released.
ii. Photosynthesis is not possible at night due to lack of sunlight.
iii. All organisms including plants respire day and night. Oxygen is taken in and carbon dioxide is given out at that time.

7. Epiphytes
- These plants depend on other plants only for shelter such plants are called epiphytes
Eg: Vanda, seethathali

8. Will the presence of epiphytes affect host plants adversely?
- No, These plants depend on other plants only for shelter. Vanda is a common type of orchid. Its thick roots can absorb moisture from the atmosphere. This is why these plants can grow even without soil.

9. What are parasites?
- Parasites are plants that grow on other plants absorb food and water from the plants on which they live. They do not prepare food for themselves.
Eg: Loranthus, Cuscuta

10. Semi parasites
Plants that absorb water and minerals from the host plant and prepare their own food with help of their leaves are known as semi parasites
Eg: Loranthus

11. Total parasites
Plants that absorb food directly from host plants are known as total parasites
Eg: Cuscuta
12.  Saprophytes
These plants grow absorbing nutrients from decomposed matter such plants are known as saprophytes
Eg: Neottia, Monotropa

13.  Climbers
The weak stemmed plants that climb on other plants are called climbers
Eg: Pepper vine, Snake gourd

14.  Creepers
The weak stemmed plants that grow creeping on the ground are called creepers
Eg: Pumpkin, sweet potato

15. Write the difference between prop roots and stilt roots.
• Roots are used not only to absorb water and minerals but also to provide support to plants.  Prop roots and stilt roots are roots seen above the soil to support the plants.
• Roots seen in the banyan tree are prop roots. These roots grow downwards from aerial branches. But look at the roots in screw pine. It is from the stem that the roots grow downwards. These roots are called stilt roots.

16. Mangroves.
Mangroves are special kinds of plants growing in marshy areas. The tip of their roots grows towards the atmosphere. These roots that help in gaseous exchange are called pneumatophores.

17. Note the difference between storage roots and underground stems.
• Tapioca stores food in roots. Roots that store food in this way is called storage roots.
• All tubers are not storage roots. Potato is a modified stem. Such stems seen below the soil are underground stems.

18. Classify the items given below into storage roots and underground stem.
Carrot, Chinese potato, Beetroot, Arrowroot, Elephant foot yam Tapioca, Colocasia, Sweet potato, Ginger, Turmeric, Shatavari, Onion



19. Know The Plants World Closely - Teaching Manual & Extended Activities - Click here.

20. Know The Plants World Closely - Teachers Handbook - Click here 
 



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