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NCERT Solutions for Class 8 Science Chapter 4 - Getting to Know Plants

Detailed answers of all the NCERT questions of the chapter "Getting to Know Plants" are provided in the document to help you in clearing all your concepts covered in the syllabus.

NCERT Solutions for Class 8 Science Chapter 4 - Getting to Know Plants

Exercises

Q1. Correct the following statements and rewrite them in your notebook.
(a) Stem absorbs water and minerals from the soil.
Ans: Roots absorb water and minerals from the soil.

(b) Leaves hold the plant upright.
Ans: Stem hold the plant upright.

(c) Roots conduct water to the leaves.
Ans: Stem conduct water to the leaves.

(d) The number of petals and sepals in a flower is always equal.
Ans: The number of petals and sepals in a flower may not be always equal.
Parts of FlowerParts of Flower

(e) If the sepals of a flower are joined together, its petals are also joined together.
Ans: If the sepals of a flower are joined together, its petals are separate and not joined
together.

(f) If the petals of a flower are joined together, then the pistil is joined to the petal.
Ans: If the petals of a flower are joined together, then the pistil may or may not be joined to the petal.


Q2. Draw (a) a leaf, (b) a taproot and (c) a flower, you have studied for Table 4.3.
Ans: 
(a)
Parts of a Leaf Parts of a Leaf (b)
Tap RootTap Root(c)
Parts of FlowerParts of FlowerQ3. Can you find a plant in your house or in your neighborhood, which has a long but weak stem? Write its name. In which category will you place it?
Ans: Yes, lauki (gourd) plant needs support. It is a climber.

Learn more about the different types of Plants like Trees, Herbs, Shrubs, Climbers, Creepers through this video: 


Q4. What is the function of a stem?
Ans: 

A stem performs following functions:

(i) The stem and its branches hold leaves to get maximum sunlight.
(ii) It transports water from roots to different parts of the plant.
(iii) It transports food from leaves to different parts of the plant.
(iv) It bears leaves, flowers and fruits.


Q5. Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), China rose 
Ans: Reticulate venation refers to the arrangement of veins in a leaf where they form a web-like structure. Smaller and more delicate veins emerge from the midrib and spread in the entire leaf.
Among the provided options, three plants exhibit reticulate venation: 

Leaf VenationLeaf Venation

  • Tulsi: The leaves of Tulsi showcase reticulate venation. When you observe a Tulsi leaf closely, you'll notice a beautiful network or mesh-like pattern formed by its veins.
  • Coriander (Dhania): The leaves of Coriander, also known as Dhania, display reticulate venation. The veins in the leaves create an intricate network, making them stand out.
  • China Rose: The leaves of China Rose, a flowering plant, also have reticulate venation. You can identify this characteristic network pattern in the structure of its leaves.


Q6. If a plant has fibrous root, what type of venation do its leaves have?
Ans: If a plant has a fibrous root, its leaves have parallel venation. This means that the veins in the leaves run parallel to each other, providing structural support and efficient transport of water and nutrients. 


Q7. If a plant has leaves with reticulate venation, what kind of roots will it have? 
Ans: If a plant has leaves with reticulate venation, it will have a tap root. In a taproot system, there is a primary, thick root (the taproot) from which smaller, lateral roots branch out. 


Q8. Is it possible for you to find out whether a plant has taproot or fibrous roots by looking at the impression of its leaf on a sheet of paper?
Ans: Yes, it is possible to find whether a plant has taproot or fibrous roots by looking at the impression of its leaf on a sheet of paper. If the veins in the leaf impression exhibit parallel arrangement, the plant likely has fibrous roots. If the veins form a network or mesh-like pattern, the plant is likely to have a taproot system.
Venation and RootsVenation and Roots
Q9. What are the parts of a flower?
Ans: The parts of a flower are sepals, petals, stamens and pistil. These parts play crucial roles in reproduction and are essential components of the plant's reproductive structures. 

Parts of FlowerParts of Flower

  • Sepals: Sepals are the outermost whorl of floral parts, usually green and leaf-like. Their main function is to protect the flower during the bud stage. They enclose and shield the inner floral parts, providing support and acting as a protective covering.
  • Petals: Petals are often brightly colored and contribute to the visual attractiveness of the flower. Their primary function is to attract pollinators like bees, butterflies, and birds. The color, fragrance, and patterns of petals are key factors that lure pollinators, aiding in the process of pollination.
  • Stamens: Stamens are the male reproductive organs of a flower and consist of two main parts: the filament and the anther. The filament provides support to the anther, where pollen grains are produced. The pollen contains male gametes, and the stamens play a crucial role in the transfer of pollen from the male reproductive organs to the female reproductive organs for fertilization.
  • Pistil: The pistil is the female reproductive organ of a flower and comprises three main parts: the stigma, style, and ovary.
    Stigma: The stigma is the sticky, often knob-like structure at the top of the pistil. It receives pollen during pollination.
    Style: The style is the slender tube that connects the stigma to the ovary. It provides a pathway for pollen to travel from the stigma to the ovary.
    Ovary: The ovary is the enlarged base of the pistil. It contains ovules, which are potential seeds. After fertilization, the ovary develops into a fruit, protecting and nourishing the seeds.


Q10. From the following plants, which of them have flowers?
Grass, maize, wheat, chilli, tomato, tulsi, peepal, shisham, banyan, mango, jamun, guava, pomegranate, papaya, banana, lemon, sugarcane, potato, groundnut
Ans: The plants which have flowers are grass, maize, wheat, chilli, tomato, tulsi, peepal, shisham, banyan (flowers lie inside its fruits), mango, jamun, guava, Pomegranate, papaya, banana, lemon, sugarcane, potato, groundnut


Q11. Name the part of plant which produces food. Name the process.
Ans: Leaves make food in a process called photosynthesis. It's like the plant's cooking method.
PhotosynthesisPhotosynthesis

  1. Leaves - The Plant's Kitchen: Leaves are like the kitchen where the plant cooks its food.
  2. Photosynthesis - The Cooking Process:
  • Ingredients:
    Sunlight (from the sun)
    Carbon Dioxide (from the air)
    Water (from the ground)
  • Mixing: Leaves mix these ingredients using chlorophyll.
  • Outcome: Leaves create their own food, a kind of sugar.
    This food gives the plant energy.

So, in short, leaves use photosynthesis to cook up their food with sunlight, air, and water.


Q12. In which part of a flower, you will find the ovary? 
Ans: Ovary is located in the lowermost and swollen part of the pistil of flower.


Q13. Name two plants in which one has joined sepals and the other has separate sepals.
Ans: 

Joined Sepals:

  • Datura: The sepals in Datura flowers are fused, forming a distinct cup-like structure at the base of the flower.
  • Cotton: Cotton flowers also have joined sepals, contributing to the unique appearance of the flower bud.

Separated Sepals:

  • Lotus: The sepals of the lotus flower are separate, distinct from each other, and encircle the base of the flower.
  • Rose: Roses are known for their separate sepals, where each sepal is individual and not fused with others.
The document NCERT Solutions for Class 8 Science Chapter 4 - Getting to Know Plants is a part of the Class 6 Course Science Class 6.
All you need of Class 6 at this link: Class 6
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FAQs on NCERT Solutions for Class 8 Science Chapter 4 - Getting to Know Plants

1. What are the different parts of a plant?
Ans. A plant has several different parts, including roots, stem, leaves, flowers, and fruits. The roots anchor the plant in the ground and absorb water and nutrients. The stem provides support to the plant and transports water, minerals, and food. The leaves are responsible for photosynthesis, a process that enables plants to make food using sunlight. Flowers are the reproductive parts of a plant, and they produce seeds and fruits.
2. How does photosynthesis occur in plants?
Ans. Photosynthesis is a process by which plants manufacture food using sunlight, carbon dioxide, and water. The leaves of a plant contain a pigment called chlorophyll, which captures sunlight. Through a series of chemical reactions, carbon dioxide from the air enters the leaves through tiny pores called stomata. Water is absorbed by the roots and transported to the leaves through the stem. In the presence of sunlight, carbon dioxide, and water, chlorophyll helps convert them into glucose (food) and oxygen. The oxygen is released into the air, while glucose is stored in different parts of the plant.
3. What is the role of flowers in plants?
Ans. Flowers play a crucial role in the life cycle of plants. They are the reproductive parts of a plant and are responsible for producing seeds and fruits. Flowers have both male and female reproductive organs. The male reproductive organ, called the stamen, produces pollen grains. The female reproductive organ, called the pistil, contains the ovary where the seeds develop. When pollen grains from the stamen reach the pistil, fertilization occurs, and seeds are formed. Flowers also attract pollinators like bees and butterflies, which help in the transfer of pollen from one flower to another.
4. How do roots help plants?
Ans. Roots play a vital role in the survival of plants. They anchor the plant in the ground, providing stability and support. Roots also absorb water and nutrients from the soil, which are essential for the growth and development of the plant. The root system of a plant is usually underground and consists of primary roots and secondary roots. Primary roots grow directly from the seed, while secondary roots branch out from the primary roots. Some plants also have specialized roots, such as taproots and fibrous roots, which help them adapt to different environments.
5. What is the importance of stem in plants?
Ans. The stem of a plant has several important functions. It provides support and structure to the plant, allowing it to stand upright. The stem also acts as a transportation system, carrying water, minerals, and food to different parts of the plant. The vascular tissues present in the stem help in the upward movement of water and nutrients from the roots to the leaves. In addition, the stem holds the leaves, flowers, and fruits of a plant, allowing them to receive maximum sunlight for photosynthesis. Some stems also store food and water, which can be used during times of scarcity.
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