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Plant Life - 2 Class 4 Worksheet Science

Q1: Fill in the Blanks.

(i) Plants produce their food through the process of ____________.
Ans:
Photosynthesis
Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen using chlorophyll present in their chloroplasts.

(ii) The green pigment responsible for photosynthesis is called ____________.
Ans: 
Chlorophyll
Chlorophyll is the green pigment found in chloroplasts of plant cells. It absorbs light energy from the sun, which is essential for photosynthesis to occur.
Plant Life - 2 Class 4 Worksheet Science

(iii) The process of pollination takes place with the help of ____________.
Ans: 
Pollinators
Pollinators, such as bees, butterflies, and birds, help in the transfer of pollen from the male reproductive part (anther) to the female reproductive part (stigma) of flowers, facilitating pollination.

(iv) The swollen base of the pistil is called ____________.
Ans: 
Ovary
The ovary is the swollen base of the pistil in a flower. It contains ovules that, when fertilized, develop into seeds.
Plant Life - 2 Class 4 Worksheet Science

(v) The process of water movement through a plant is called ____________.
Ans: 
Transpiration
Transpiration is the process of water movement through a plant, from the roots to the leaves, where it evaporates into the atmosphere through tiny pores called stomata.

Q2: Match the Column.

Match the following plant parts with their respective functions:

Plant Life - 2 Class 4 Worksheet ScienceAns:
Roots - b. Absorbing water
Roots anchor the plant in the soil and absorb water and minerals from the soil for the plant's growth and nutrition.
Leaves - a. Photosynthesis
Leaves are the primary site of photosynthesis in plants, where chlorophyll absorbs sunlight to produce food for the plant.
Stem - c. Support and transport
The stem provides support to the plant and serves as a transportation system, carrying water and nutrients between the roots and leaves.
Flowers - d. Reproduction
Flowers are the reproductive structures of plants, where the male and female gametes combine to form seeds.
Chlorophyll - e. Anchoring the plant
Chlorophyll is not involved in anchoring the plant. It is responsible for capturing light energy during photosynthesis.

Q3: True or False.

(i) True/False: All plants need sunlight for photosynthesis.
Ans: False - While most plants need sunlight for photosynthesis, some can perform photosynthesis in low light conditions.
Plant Life - 2 Class 4 Worksheet Science

(ii) True/False: The process of pollination occurs after fertilization.
Ans: False - Pollination occurs before fertilization, where pollen from the anther reaches the stigma of the same or another flower.

(iii) True/False: Roots are responsible for absorbing carbon dioxide from the atmosphere.
Ans: False - Roots absorb water and minerals, but they do not absorb carbon dioxide. The leaves are responsible for absorbing carbon dioxide.
Plant Life - 2 Class 4 Worksheet Science

(iv) True/False: A plant cell has a rigid cell wall, while an animal cell does not.
Ans: True - Plant cells have a rigid cell wall that provides structural support, while animal cells do not have a cell wall.

(v) True/False: Insects play a significant role in the process of pollination.
Ans: True - Insects, such as bees and butterflies, play a significant role in the pollination process by transferring pollen from one flower to another.

Q4: Multiple Choice Questions.

(i) What is the primary function of a flower in a plant?
(a)
To conduct photosynthesis
(b) To anchor the plant to the ground
(c) To absorb water and nutrients
(d) To facilitate reproduction
Ans:
(d)
The primary function of a flower in a plant is to facilitate reproduction by producing seeds through the process of pollination and fertilization.
Plant Life - 2 Class 4 Worksheet Science

(ii) Which of the following plant parts is responsible for carrying water and nutrients between the roots and leaves?
(a) Flowers
(b) Stem
(c) Leaves
(d) Roots

Ans: (b)
The stem is responsible for carrying water and nutrients between the roots and leaves through specialized tissues called xylem and phloem.

(iii) Which part of the plant holds the pollen grains?
(a) Stigma
(b) Ovary
(c) Petal
(d) Anther

Ans: (d)
The anther is the part of the flower that holds the pollen grains, which contain the male gametes.
Plant Life - 2 Class 4 Worksheet Science

(iv) Photosynthesis mainly occurs in the cells of:
(a) Roots
(b) Stems
(c) Leaves
(d) Flowers

Ans: (c)
Photosynthesis mainly occurs in the leaves of the plant, where chlorophyll captures sunlight to produce food for the plant.

(v) What is the function of the stomata in leaves?
(a) Absorbing sunlight
(b) Transporting water
(c) Exchanging gases
(d) Providing support

Ans: (c)
Stomata are small pores on the surface of leaves that allow the exchange of gases, such as carbon dioxide and oxygen, between the plant and the atmosphere.

Q5: Arrange in Correct Order.

Arrange the following steps in the correct order for the process of pollination:
(a) Fertilization takes place.
(b) Pollen is transferred to the stigma.
(c) Insects carry pollen from one flower to another.
(d) Pollen tube reaches the ovary.
(e) Pollen grains are produced in the anther.
Ans: Correct Order is
(e) Pollen grains are produced in the anther.
(b) Pollen is transferred to the stigma.
(d) Pollen tube reaches the ovary.
(a) Fertilization takes place.
(c) Insects carry pollen from one flower to another.
The process of pollination starts with the production of pollen grains in the anther. These pollen grains are then transferred to the stigma of the flower. From the stigma, a pollen tube develops and reaches the ovary, where fertilization takes place, resulting in the formation of seeds. Some plants rely on insects to carry pollen from one flower to another, aiding in the pollination process.

Q6: Short Questions.

(i) Explain the process of photosynthesis in plants.
Ans:
Photosynthesis is the process by which green plants and some other organisms use sunlight, carbon dioxide, and water to produce glucose (a form of sugar) and oxygen. This process takes place in the chloroplasts of plant cells. Chlorophyll, the green pigment present in chloroplasts, captures sunlight and converts it into chemical energy, which is used to synthesize glucose from carbon dioxide and water. The oxygen produced during photosynthesis is released into the atmosphere as a byproduct. This glucose is then used as a source of energy for the plant's growth and various metabolic processes.

(ii) Describe the various ways by which seeds can be dispersed.
Ans:
Seed dispersal is the process by which seeds are spread from the parent plant to other locations, enabling new plants to grow in different areas. Seed dispersal is crucial for plant reproduction and genetic diversity. Various methods of seed dispersal include wind dispersal (seeds with wings or feathery structures), water dispersal (buoyant seeds), animal dispersal (seeds with hooks or fruits eaten by animals), and explosive dispersal (seeds that burst open to scatter seeds). Each method increases the chances of seeds reaching suitable environments for germination and growth, reducing competition with the parent plant.

(iii) Differentiate between taproots and fibrous roots.
Ans: 
Taproots and fibrous roots are two types of root systems found in plants.

  • Taproots: Taproots have a main root that grows vertically deep into the soil. From the main root, smaller lateral roots branch out horizontally. Taproots are typically found in dicotyledonous plants, such as carrots and radishes. They provide strong anchorage to the plant and store nutrients.
  • Fibrous roots: Fibrous roots form a dense network of thin, branching roots that spread out horizontally close to the soil surface. They are common in monocotyledonous plants, such as grasses. Fibrous roots help in absorbing water and nutrients effectively from the upper layers of the soil.

Plant Life - 2 Class 4 Worksheet Science

(iv) How does a plant respond to the stimulus of light? Give an example.
Ans:
Plants respond to the stimulus of light through phototropism. Phototropism is the movement or growth of a plant in response to light direction. When a plant receives more light from one direction, it tends to bend or grow towards the light source. For example, a plant placed near a window will exhibit phototropism by bending its stems and leaves towards the window to maximize light absorption for photosynthesis.

(v) What is germination? Describe the conditions necessary for seed germination.
Ans: 
Germination is the process by which a seed develops into a new plant under favorable conditions. For successful germination, seeds require three main conditions: water, suitable temperature, and oxygen.

  • Water: Water is essential to initiate the metabolic processes in the seed, rehydrating the cells and activating enzymes responsible for breaking down stored nutrients for growth.
  • Suitable Temperature: Seeds require a specific temperature range to germinate. Each plant species has an optimal temperature range for germination, and it varies from species to species.
  • Oxygen: Oxygen is necessary for respiration during germination. The embryo inside the seed consumes oxygen to produce energy for growth.

Plant Life - 2 Class 4 Worksheet Science

The document Plant Life - 2 Class 4 Worksheet Science is a part of the Class 5 Course Science Class 5.
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FAQs on Plant Life - 2 Class 4 Worksheet Science

1. What are the different parts of a plant?
Ans. The different parts of a plant are the roots, stem, leaves, flowers, and fruits. The roots anchor the plant in the ground and absorb water and nutrients. The stem provides support and transports water, nutrients, and sugars between the roots and leaves. The leaves are responsible for photosynthesis, where they capture sunlight and convert it into energy. The flowers are the reproductive structures of the plant, and the fruits contain seeds.
2. How do plants make food?
Ans. Plants make food through a process called photosynthesis. During photosynthesis, plants use sunlight, carbon dioxide from the air, and water from the roots to produce glucose (a type of sugar) and oxygen. The chlorophyll pigment in the leaves captures sunlight, which is then used to convert carbon dioxide and water into glucose. This glucose is used as a source of energy by the plant or stored for later use.
3. Why are flowers important for plants?
Ans. Flowers are important for plants because they play a crucial role in reproduction. The flowers contain the reproductive organs of the plant, including the male part called the stamen and the female part called the pistil. The stamen produces pollen, which is transferred to the pistil through pollination. This process leads to fertilization and the formation of seeds, which can grow into new plants. Additionally, flowers attract pollinators such as bees, butterflies, and birds, which help in the pollination process.
4. How do plants survive in different environments?
Ans. Plants have adapted to survive in different environments through various mechanisms. In hot and dry environments, some plants have developed thick waxy coatings on their leaves to reduce water loss. Others have long taproots that can reach deep water sources. In cold environments, some plants shed their leaves to conserve energy and protect themselves from freezing temperatures. Plants in aquatic environments have adapted to absorb nutrients through their roots or leaves and have air-filled spaces to help them float.
5. How do plants reproduce without flowers?
Ans. While most plants reproduce through flowers and seeds, some plants can reproduce without flowers. These plants, called ferns and mosses, reproduce through spores. Spores are tiny reproductive cells that are released by the parent plant and can grow into new plants under favorable conditions. Ferns reproduce by releasing spores from structures called sporangia, while mosses reproduce by releasing spores from capsules. This method of reproduction allows these plants to colonize new areas and adapt to different environments.
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