CBSE Class 4 Environmental Studies Chapter 19 जड़ों का जाल NCERT Solutions

The small grass plant could not be pulled out easily because its roots are spread out and go deep into the soil, firmly holding the plant in place. In contrast, the stick supporting the pea vine had no roots and was merely placed in the soil, so it came off easily with a jerk.

Yes, all plants have roots. Roots are an essential part of a plant's structure, even if they are not always visible or as extensive as in larger plants.

The depth of roots varies greatly depending on the type of plant. For small plants like flowers or herbs, the roots might extend a few inches to about a foot into the soil. For larger trees, the roots can go several feet, or even tens of feet, deep into the ground to find water and support.

The broken part of the pea plant that dried up would be the stem and the leaves attached to it. This is because the broken stem was no longer connected to the roots, which are responsible for absorbing water and nutrients from the soil. Without this supply, the stem and leaves could not survive and eventually dried up.

The neem tree did not fall even in strong winds because its roots are very strong and have grown deep into the soil. This extensive and deep root system provides a very stable anchor, allowing the tree to withstand strong winds without uprooting.

Wilted plants become green again when given water because their roots absorb the water from the soil. This water is then transported upwards through the stem to the leaves and other parts of the plant. Water is essential for photosynthesis and maintaining the turgor pressure in plant cells, which helps the leaves regain their firmness and green color.

Yes, all plants need water to survive. Water is crucial for various life processes in plants, including photosynthesis, nutrient transport, and maintaining their structure.

Smaller plants, such as flowering plants, vegetable plants in a garden, and young saplings, usually need to be watered regularly. These plants often have shallower root systems and cannot access water from deep underground.

If these plants are not watered, they will start to wilt due to lack of water. If the condition persists, they will eventually dry up and die.

Abdul's thought is correct; neem trees are usually not watered by people. They get their water from deep within the soil. Their extensive root systems reach down to underground water sources, allowing them to survive without needing external watering.

Large, established trees like Neem, Mango, and Peepal generally do not need to be watered regularly. They have very deep and widespread root systems that can access water from deep underground or from rainfall that has seeped into the soil.

(a) They get water from deep inside the soil, where underground water is available. (b) They absorb water from rainwater that seeps deep into the ground.

Abdul was surprised because he might not have known that many vegetables we eat are actually the roots of plants. Radish is one such vegetable that is the root of the radish plant, and it stores food for the plant.

The vegetables that are roots of plants from the given pictures are: - Radish (मूली) - Carrot (गाजर) - Beetroot (चुकंदर) - Kohlrabi (गाँठ गोभी) is a swollen stem, not a root.

The roots of a plant growing out of a wall are likely going deep into the cracks and crevices of the wall, seeking moisture and a place to anchor themselves.

This plant gets water from the moisture present within the wall. Rainwater seeping into the wall or condensation can provide the necessary water for survival.

If the plant is not removed, it can grow quite large, potentially becoming a tree. However, its growth might be limited by the space and resources available within the wall's structure.

As the plant grows larger, its roots will spread and exert pressure on the wall. This can cause the wall to crack further or even crumble over time, damaging the structure.

The plant shown in the picture is a Peepal tree (Pipal ka paudha).

Yes, I have seen plants growing from cracks in walls. For example, I have seen small plants growing on the back boundary wall of my school.

Yes, seeing a plant grow in such an unusual place raises several questions, such as how it got there, how it survives without soil and regular water, and what will happen to the wall as it grows.

(a) The plant grew from a seed that landed in the crack of the wall. Over time, the seed germinated, and the plant started growing using the available moisture and nutrients. (b) Birds like crows or sparrows might have dropped the seed there, or the wind might have carried it and it got stuck in the crack.

The plant I saw growing in the wall was a Banyan tree (Vat ka paudha).