STD-7th Sub-science Mark-20

2.

Deserts are characterized by severs of --------.

Snowfall
Water
Shrub
Flower

Correct Answer

A. Water

Explanation

Deserts are characterized by severe lack of water. This means that deserts receive very little rainfall and have limited water sources such as rivers, lakes, or underground aquifers. The arid climate and high temperatures in deserts result in rapid evaporation, causing water to be scarce. This scarcity of water is a defining characteristic of deserts, making it the correct answer.

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3.

We can categorize animals as herbivores and ------------.

Parasitic
Insects
Carnivorous
Autotrophic

Correct Answer

A. Carnivorous

Explanation

Animals can be categorized into herbivores, which primarily consume plants and vegetation, and carnivores, which predominantly feed on other animals. Herbivores have specialized digestive systems adapted to break down cellulose found in plants, relying on vegetation for energy and nutrients. In contrast, carnivores possess adaptations like sharp teeth and claws for hunting and consuming meat, deriving their energy from animal proteins and fats. These classifications reflect different dietary strategies among animals in the natural world.

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4.

Coniferous tree like --------- and deodar flourish in snowy regions like Kashmir.

Pine
Lotus
Cactus
Cuscuta

Correct Answer

A. Pine

Explanation

Coniferous trees like pine and deodar are well adapted to snowy regions like Kashmir because they have certain characteristics that enable them to thrive in such conditions. These trees have needle-like leaves that reduce water loss, allowing them to conserve moisture during the cold and dry winters. Additionally, their branches are designed to shed snow easily, preventing the accumulation of heavy snowfall that could damage the tree. The pine tree, specifically, is known for its ability to withstand cold temperatures and grow in nutrient-poor soils, making it a suitable choice for snowy regions like Kashmir.

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5.

Leaves of some aquatic plants are thin and slender like a ---------.

Leafless
Fleshy
Conical
Ribbon

Correct Answer

A. Ribbon

Explanation

The correct answer is "ribbon." This is because the question is asking for a comparison to describe the thin and slender nature of the leaves of some aquatic plants. A ribbon is a long, narrow strip of material that is thin and slender in shape, making it an appropriate comparison for the leaves in question.

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6.

Q.2 a) True or false A great variety of plants is found on the earth.

True
False

Correct Answer

A. True

Explanation

There is a great variety of plants found on Earth, which includes thousands of different species. This diversity can be observed in various ecosystems, ranging from rainforests to deserts. Plants play a crucial role in maintaining the balance of ecosystems and providing habitats for other organisms. They also contribute to the production of oxygen and the absorption of carbon dioxide, making them essential for the survival of life on Earth. Therefore, it is true that a great variety of plants is found on the Earth.

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7.

Coniferous trees like pine and deodar flourish in grasslands

True
False

Correct Answer

A. False

Explanation

Coniferous trees like pine and deodar do not flourish in grasslands. They are typically found in forests, especially in regions with cooler climates. Grasslands, on the other hand, are characterized by the presence of grasses and other herbaceous plants, rather than trees. Therefore, the statement is false.

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1

8.

Desert plants are either leafless.

True
False

Correct Answer

A. True

Explanation

Desert plants are adapted to survive in arid environments with limited water availability. One of the adaptations they have is being leafless or having reduced leaves. This helps to minimize water loss through transpiration, as leaves are the main site of water evaporation in plants. Instead, these plants often have thick, fleshy stems or modified leaves that store water. Therefore, the statement "Desert plants are either leafless" is true, as many desert plants have evolved to reduce or eliminate their leaves as a water-saving mechanism.

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9.

Fungi contain chlorophyll so they make their own food.

True
False

Correct Answer

A. False

Explanation

Fungi do not contain chlorophyll, which means they are unable to perform photosynthesis and make their own food like plants do. Instead, fungi obtain nutrients by breaking down organic matter in their environment. Therefore, the correct answer is False.

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10.

Plants need nitrogen, phosphorus and potassium for growth.

True
False

Correct Answer

A. True

Explanation

Plants require essential nutrients such as nitrogen, phosphorus, and potassium for their growth. Nitrogen is necessary for the development of proteins, enzymes, and chlorophyll. Phosphorus is essential for energy transfer and the formation of DNA and cell membranes. Potassium plays a vital role in water regulation, nutrient transportation, and overall plant development. Therefore, it is true that plants need nitrogen, phosphorus, and potassium for their growth.

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11.

Q.2 b) find the odd-man-out. a)potato b) groundnut c)carrot d)bittergourd.

Potato
Groundnut
Carrot
Bittergourd.

Correct Answer

A. Bittergourd.

Explanation

The odd-man-out in this list is bittergourd because it is the only vegetable that is not commonly used in cooking or consumed as a staple food in many cultures. Potato, groundnut, and carrot are all commonly used vegetables in various cuisines around the world.

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12.

A) yak b)white fox c) mountain goat d) camel

Yak
White fox
Mountain goat
Camel

Correct Answer

A. Camel

Explanation

The given list consists of different animals, and the correct answer is "camel". The other options, yak, white fox, and mountain goat, do not match the pattern of the animals listed. Therefore, the correct answer is camel.

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13.

A)cactus b)lotus c)cuscuta d)Deodar tree

Cactus
Lotus
Cuscuta
Deodar tree

Correct Answer

A. Cuscuta

14.

A) house lizard b)earthwarm c) crocodile d)butterflies

House lizard
Earthwarm
Crocodile
Butterflies

Correct Answer

A. Butterflies

Explanation

The correct answer is butterflies because out of the given options, butterflies are the only ones that are commonly found in houses. House lizards are typically found in tropical regions but not necessarily inside houses. Earthworms are usually found in soil or gardens. Crocodiles are large aquatic reptiles and are not found in houses. Therefore, butterflies are the most appropriate answer.

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15.

A) trees b) shrubs c)flower d)hearb.

Trees
Shrubs
Flower
Hearb.

Correct Answer

A. Flower

Explanation

The correct answer is "flower" because it is the only option that is spelled correctly. The other options, "trees," "shrubs," and "hearb," all contain spelling errors.

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STD-7th Sub-science Mark-20

Q.1 a)fill in the blanks. Desert plants are either ------or their leaves are like small needles.

Quiz Preview

Deserts are characterized by severs of --------.

We can categorize animals as herbivores and ------------.

Coniferous tree like --------- and deodar flourish in snowy regions like Kashmir.

Leaves of some aquatic plants are thin and slender like a ---------.

Q.2 a) True or false A great variety of plants is found on the earth.

Coniferous trees like pine and deodar flourish in grasslands

Desert plants are either leafless.

Fungi contain chlorophyll so they make their own food.

Plants need nitrogen, phosphorus and potassium for growth.

Q.2 b) find the odd-man-out. a)potato b) groundnut c)carrot d)bittergourd.

A) yak b)white fox c) mountain goat d) camel

A)cactus b)lotus c)cuscuta d)Deodar tree

A) house lizard b)earthwarm c) crocodile d)butterflies

A) trees b) shrubs c)flower d)hearb.