Comparable to bamboo bridge cement bridge will be stronger.

Cement bridge is more durable.

Famous cement bridge in INDIA is PAMBAN BRIDGE in Salem, TamilNADU

Gravel and Sand mixture is used in making cement bridge

Mostly found in RURAL AREAS

A non-governmental organization (NGO) is any non-profit, voluntary citizens' group which is organized on a local, national or international level.

Photosynthetic is something relating to or involved in the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water.

1. Oxygen They help us breathe and the more they cut them down to make buildings the less oxygen. Think about it what is more important your life or a buliding
2. They prevent floods • There roots help soak in water from rains so that we wont have floods that’s probably why we have floods now.
3. Help prevent blindness • They shade out the sun from getting in your face.
4. It provides food • They give us food
5. Help us keep us cool • They help keep us from getting overheating like a computer and passing out

The green plants can prepare their own food. The excess amount of food is stored in the seed to nourish the little young plant. The unique way by which green plants make their own food is called photosynthesis (Photo = light, synthesis = to make).

Bengali, also known by its endonym Bangla, is an Indo-Aryan language primarily spoken by the Bengalis in South Asia. It is the official and most widely spoken language of Bangladesh and second most widely spoken of the 22 scheduled languages of India, behind Hindi.

The process of transformation from an immature form to an adult form in two or more distinct stages.
Two insects that undergo the process of metamorphosis are:

1. LADYBUGS (COCCINELLIDAE) 
2. MAYFLY (EPHEMEROPTERA)

Asexual reproduction includes fission, budding, fragmentation, and parthenogenesis, while sexual reproduction is achieved through the combination of reproductive cells from two individuals.

Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parents". The cloning of an organism is a form of asexual reproduction. By asexual reproduction, an organism creates a genetically similar or identical copy of itself.

Porcupines, porcupine fish and starfish have spines on the surface of their body. The spines can injure enemies that go near or attack these animals.
a) Porcupines raise their long, stiff spines as a warning when their enemies go near them.
b) A porcupine fish can inflate its body by drinking a lot of water.This raises the sharp spines on the fish’s body. The spines help to keep the fish’s enemies away.

Some animals have body shapes or colours that match their surroundings. This makes it easier for these animals to hide from their enemies.
a) Leaf insects have green body parts that look like leaves.
b) Sticks insects have along, thin body that look like a stick or twig.Their body colour is also similar to the colour of twigs.
c) Zebras have black and white stripes on their bodies. This makes it more difficult for their enemies to spot them from a distance.

Centipedes, cobras, wasps and scorpions ca defend themselves from their enemies by using their poison.
a) Centipedes and cobras can bite their enemies to weaken or kill them.
b) Wasps and scorpions can sting their enemies to weaken or kill them.

Animals are grouped according to which type of food they eat :

• Herbivores :They depend for their nourishment on plant parts or products. eg: cow ,goat, etc.
• Carnivorous :They consume other animals for their survival. eg: lion,tiger,etc.
• Omnivorous :They consume both plant and animals. They can live on both diets.eg :humans,etc.
• Scavengers:They consume the dead and decaying matter and are often called the cleaning agents of natural environment. eg: vulture, hyena 

There are different types of animals around us. The large number of animals in the world can be broadly classified into two groups on the presence and absence of the backbone.

1. Vertebrates (Animals with backbone) Some animals have backbone called vertebral column and a hard skeleton of a number of bones. Fish, frog, bird, lizard, snake, tiger, rabbit, whale, man, etc. The backbone is a part of the skeleton.
2. Invertebrates (Animal without backbone) Some animals have no backbones. They have soft bodies because there is bony skeleton inside. Snail, an earthworm, a bee or a mosquito, etc. are invertebrates.

An animal that feeds on carrion, dead plant material, or refuse.

Examples of scavenger animals include: Vulture, Carrion beetle, Blowflies.

Most animals have some form of adaptation to make them more successful and increase their chances for survival. One such adaptation is camouflage. Many animals have evolved to exhibit some form of camouflage, which is an adaptation that allows animals to blend in with certain aspects of their environment. Camouflage increases an organism's chance of survival by hiding it from predators.

The disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings.

1. अजगर करे ना चाकरी पंछी करे ना काम,
   दास मलूका कह गए सब के दाता राम….
   अर्थ – अजगर को किसी की नौकरी नहीं करनी होती और पक्षी को भी कोई काम नहीं करना होता, ईश्वर ही सबका पालनहार है, इसलिए कोई भी काम मत करो ईश्वर स्वयं देगा। आलसी लोगों के लिए श्री मलूकदास जी का ये कथन बहुत ही उचित है !
2. मुहावरा – अधजल गगरी छलकत जाय।
   अर्थ – जो व्यक्ति बहुत कम जानता है, वह विद्वान ही होने का दिखावा ज़्यादा करता है।
3. मुहावरा – अपने मुँह मियाँ मिट्ठू बनाना।
   अर्थ – अपनी बड़ाई आप ही करना।
4. मुहावरा – अब पछताए होत क्या जब चिडिया चुग गई खेत।
   अर्थ – समय रहते काम ना करना और नुक़सान हो जाने के बाद पछताना। जिससे कोई लाभ नहीं होता है।
5. मुहावरा – अंडे सेवे कोई, बच्चे लेवे कोई॥
   अर्थ – परिश्रम कोई व्यक्ति करे और लाभ किसी दूसरे को हो जाए।
6. मुहावरा – अंत भला तो सब भला।
   अर्थ – परिणाम अच्छा हो जाए, तो सभी कुछ अच्छा मान लिया जाता है।
7. मुहावरा – अढ़ाई दिन की बादशाहत।
   अर्थ – थोड़े दिन की शान-शौक़त।
8. मुहावरा – अन्‍न जल उठ जाना।
   अर्थ – किसी जगह से चले जाना।
9. मुहावरा – अन्‍न न लगना।
   अर्थ – खा-पीकर भी मोटा न होना।
10. मुहावरा – अपना-अपना राग अलापना।
    अर्थ – अपनी ही बातें कहना।

The poet feels that the nose is a funny thing because it sticks out of the face like a handle, shows out all of it and has two holes under it. holes in it are used by us for breathing.

An aerial root may be defined as a root which, for part of the day at least, is exposed to the air. The mangrove mud is rather anaerobic (oxygen poor) and unstable and different plants have root adaptations to cope with these conditions.