Grade IV worksheet on plant adaptations, including questions on underwater and floating plants, identifying the odd one out, defining terms like adaptation and transpiration, and identifying plant types from images.

Problem: Solve the worksheet on "Adaptations in Plants"

#### 1. Fill in the blanks.
We need to fill in the blanks based on our knowledge of plant adaptations.

a. Underwater plants are also called ______ plants.
- Underwater plants are also called aquatic plants.
- Answer: aquatic

b. Floating plants have ______ that are filled with air. This helps plants to float on water.
- Floating plants have air chambers or pockets that are filled with air, which help them stay afloat.
- Answer: air chambers/pockets

c. ______ plants have adapted to breathe under water.
- Plants that can breathe underwater are called aquatic plants. However, more specifically, these are often referred to as submerged aquatic plants because they live entirely underwater.
- Answer: submerged aquatic

d. Plants that grow in water are called ______ or ______ plants.
- Plants that grow in water are called hydrophytes or aquatic plants.
- Answer: hydrophytes, aquatic

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#### 2. Find the odd one out. Give reason for your answer also.

We need to identify the plant that does not belong in each group and explain why.

a. Coconut, mango, teak, mangrove
- Coconut, mango, and teak are all terrestrial (land-dwelling) trees.
- Mangrove is an exception because it is a halophyte (salt-tolerant plant) that grows in coastal areas and tidal zones.
- Odd one out: Mangrove
- Reason: Mangrove is adapted to grow in salty, brackish water, unlike the others.

b. Palm, mango, acacia, cactus
- Palm, mango, and acacia are all typical terrestrial trees found in various environments.
- Cactus is an exception because it is a xerophyte (adapted to dry conditions) and has unique features like spines and thick stems for water storage.
- Odd one out: Cactus
- Reason: Cactus is adapted to survive in arid conditions, unlike the others.

c. Orchid, rosewood, sandalwood, lotus
- Orchid, rosewood, and sandalwood are all terrestrial plants.
- Lotus is an exception because it is an aquatic plant that grows in water.
- Odd one out: Lotus
- Reason: Lotus is adapted to grow in water, unlike the others.

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#### 3. Define.
We need to define the given terms related to plant adaptations.

a. Adaptation
- Definition: Adaptation refers to the process by which organisms change over time to become better suited to their environment. In plants, adaptations include physical and behavioral traits that help them survive and reproduce in specific habitats.

b. Transpiration
- Definition: Transpiration is the process by which plants lose water vapor through small openings (stomata) in their leaves and stems. It plays a crucial role in transporting water and nutrients from the roots to the rest of the plant and helps regulate temperature.

c. Deciduous plants
- Definition: Deciduous plants are those that shed their leaves annually, typically during autumn. This adaptation helps them conserve water and energy during unfavorable seasons, such as winter.

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#### 4. Identify the diagram.
We need to identify the plants shown in the images.

1. First image (red flowers):
- This plant has bright red flowers and appears to be a flowering tree. Based on the appearance, it could be a flame tree (Delonix regia), also known as the royal poinciana.

2. Second image (green fern-like structure):
- This plant has a feathery, leafy structure and appears to be a type of ferns or algae. Given its aquatic appearance, it is likely a type of seaweed or aquatic algae.

3. Third image (spiny green plant):
- This plant has thick, spiny leaves and appears to be adapted to arid conditions. It is likely a cactus or a similar succulent plant.

4. Fourth image (tree with aerial roots):
- This plant has extensive aerial roots hanging down from its branches. It is characteristic of mangrove trees, which are adapted to grow in coastal, saline environments.

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Final Answers:

1. Fill in the blanks:
- a. Aquatic
- b. Air chambers/pockets
- c. Submerged aquatic
- d. Hydrophytes, aquatic

2. Find the odd one out:
- a. Mangrove
- b. Cactus
- c. Lotus

3. Define:
- a. Adaptation: The process by which organisms change over time to become better suited to their environment.
- b. Transpiration: The process by which plants lose water vapor through stomata in their leaves and stems.
- c. Deciduous plants: Plants that shed their leaves annually, typically during autumn.

4. Identify the diagram:
- 1. Flame tree (Delonix regia)
- 2. Seaweed/Aquatic algae
- 3. Cactus/Succulent plant
- 4. Mangrove tree

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Final Answer Box:

\[
\boxed{
\text{1. a. Aquatic, b. Air chambers/pockets, c. Submerged aquatic, d. Hydrophytes, aquatic} \\
\text{2. a. Mangrove, b. Cactus, c. Lotus} \\
\text{3. a. Adaptation: Process of becoming suited to environment, b. Transpiration: Loss of water vapor, c. Deciduous plants: Shed leaves annually} \\
\text{4. 1. Flame tree, 2. Seaweed/Aquatic algae, 3. Cactus/Succulent, 4. Mangrove tree}
}
\]