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107 questions · 1 auto-graded MCQ + 106 self-marked written.

Question 11 Mark
Tick the correct answer:

The plant which traps and feeds on insects is

  • Cuscuta

  • china rose

  • pitcher plant

  • rose

Answer
Pitcher plant
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Question 31 Mark
What is the role of leaves in photosynthesis?
Answer
Leaves contain chlorophyll that traps solar energy and takes in carbon dioxide from the air through stomata, for photosynthesis.
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Question 41 Mark
Plants prepare their food using a different mode of nutrition than us. What is it?
Answer
The mode of nutrition in plant is autotrophic, i.e. they synthesise their own food.
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Question 51 Mark
Why do organisms need to take food?
Answer
All organisms take food and utilize it to get energy for the growth and maintenance of their bodies.
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Question 61 Mark
Fill in the blanks:
Green plants are called ____________ since they synthesise their own food.
Answer
Green plants are called autotrophy since they synthesis their own food.
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Question 71 Mark
Farmers spread manure of fertilisers in the field or in gardens, etc. Why are these added to the soil?
Answer
Plants absorb mineral nutrients from soil. Thus, declining their concentration in soil fertilisers and manures enhance or add these essential nutrients back in soil.
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Question 101 Mark
How does photosynthesis occur in desert plants?
Answer
In desert plants to minimize water loss, leaves are reduced to spines. Most of the photosynthesis is carried by the green stem.
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Question 111 Mark
Except plants, why can’t other living organisms prepare their food using $\mathrm{CO}_2$, water and minerals?
Answer
Our body does not contain chlorophyll for absorbing solar energy which is necessary for preparing food using air, water, etc.
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Question 121 Mark
What are autotrophs?
Answer
Organisms which can prepare their own food from raw materials (like mineral and water) are called autotrophs. e.g. green plants.
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MCQ 131 Mark
Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as:
  • A
    Saprophyte.
  • B
    Parasite.
  • C
    Autotroph.
  • Symbiosis.
Answer
Correct option: D.
Symbiosis.
Symbiosis.
Symbiosis is an association between two different organisms that live together and help each other to survive, e.g. Licher (association between an alga and fungus).
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Question 141 Mark
Which parts of the plant are called food factories of the plant?
Answer
Leaves are referred to as food factories of plants. This is because, leaves synthesise food by the process of photosynthesis.
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Question 151 Mark
A unique feature in leaves allows them to prepare the food while other parts of plants cannot. Write the possible reason for this.
Answer
Leaves contain chlorophyll which is essential for food preparation and is absent in other parts of plant.
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Question 161 Mark
Why is leaf of croton plant taken to prove that chlorophyll is necessary for photosynthesis?
Answer
Croton plant leaves are partly green and partly non-green and chlorophyll is present only in green portion of these leaves.
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Question 171 Mark
Mark $‘T’$ if the statement is true and $‘F’$ if it is false: Carbon dioxide is released during photosynthesis. $(T/ F)$
Answer
False.
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Question 181 Mark
In a plant, photosynthesis occurs in a part other than leaf. Name that plant and the part where photosynthesis occurs.
Answer
Cactus, the part where photosynthesis occurs are stem and branches which are green.
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Question 191 Mark
Why are green plants called autotrophs?
Answer
Green plants prepare their own food with the help of carbondioxide, water in presence of sunlight and chlorophyll. So, they are called autotrophs.
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Question 201 Mark
Why do some plants feed on insects?
Answer
Insectivorous plants grow in soil which lack nitrogen, therefore they eat insects to fulfill their need of nitrogen.
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Question 211 Mark
Why do we need food?
Answer
Living organisms need food to build their bodies, to grow, to repair damaged parts of their bodies and provide with energy to carry out life processes.
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Question 221 Mark
A cell is formed of many sub-components. Identify different constituents of the cell. Are animal and plant cells similar?
Answer
A cell contains nucleus, cytoplasm, vacuole, cell organelles like chloroplast, mitochondria, etc. No, animal cells are different from plant cells.
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Question 231 Mark
A carbohydrate is produced by plants as food source. It is constituted from which molecules?
Answer
Carbohydrates are composed of carbon, hydrogen and oxygen.
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Question 251 Mark
Why can’t our body make food from carbon dioxide, water and minerals like plants do?
Answer
This is because our body cells do not contain the necessary apparatus for photosynthesis.
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Question 261 Mark
What are the main components presents in carbohydrates?
Answer
The main components presents in carbohydrates are carbon, hydrogen and oxygen.
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Question 281 Mark
What are the four things essential for photosynthesis.
Answer
  1. Chlorophyll.
  2. Sunlight.
  3. Carbon Dioxide.
  4. Water.
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Question 291 Mark
What are variegated leaves? Give examples of such plants.
Answer
Some plants have green or white or other colour parts in the same leaf. Such leaves are called variegated leaves. Examples are: croton, money plant and coleus.
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Question 301 Mark
Fungus can be harmful and useful. Give an example showing both of these traits of fungus.
Answer
Fungus produces antibiotics like penicillin used to treat diseases and fungus can also harm us by causing fungal infections on skin and hair.
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Question 321 Mark
For testing the presence of starch in leaves, a boiled leaf is used. Why?
Answer
Boiling the leaf remove chlorophyll/ green colour from the leaves.
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Question 331 Mark
Algae and fungi form a unique association sharing benefits from each other. What is the name of association between them?
Answer
Lichens.
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Question 341 Mark
Fill in the blanks: During photosynthesis plants take in ___________ and release ___________ gas.
Answer
During photosynthesis plants take in carbon dioxide and release oxygen.
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Question 361 Mark
How does exchange of gases takes place in leaves?
Answer
Carbon dioxide from the air is taken in through tiny pores present on the leaves called stomate surrounded by guard cells. Guard cells control the opening and closing of stomate. Oxygen is released from the stomate as a waste product of photosynthesis.
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Question 371 Mark
Mark $‘T’$ if the statement is true and $‘F’$ if it is false:
Plants which synthesise their food are called saprotrophs. $(T/ F)$
Answer
False.
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Question 391 Mark
Name the scientist who experimentally demonstrated that plants produce oxygen and purify air.
Answer
Joseph Priestley.
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Question 401 Mark
Some plants have deep red, violet or brown leaves. Do these leaves also carry out photosynthesis?
Answer
The leaves other than green also have chlorophyll. The large amount of red, brown and other pigments mask the green colour. Photosynthesis takes place in these leaves also.
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Question 411 Mark
What are symbiotic plants? Give an example.
Answer
Plants that live in association with other plants and share shelter and food are called symbiotic plants. Lichens show symbiotic relationship i.e. association of green alga and fungi. Green alga prepare food by photosynthesis while the fungi provide mineral and water.
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Question 431 Mark
Name the organism responsible for converting atmospheric nitrogen into soluble forms.
Answer
Rhizobium bacteria.
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Question 451 Mark
Name the bacteria that can fix atmospheric nitrogen.
Answer
Rhizobium is the bacterium which can fix atmospheric nitrogen.
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Question 471 Mark
Does Cuscuta (Amrbel) have chlorophyll? How does it prepare its food?
Answer
No it does not have chlorophyll. It is a parasitic plant which absorbs food from readymade plants.
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Question 491 Mark
If the pitcher plant is green and carries out photosynthesis, then why does it feed on insects?
Answer
Pitcher plant does not get the sufficient nutrients from plants. Therefore, it fulfils its requirement by eating insects.
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Question 511 Mark
State the equation for the process of photosynthesis.
Answer
Carbon dioxide + water → carbohydrate + Oxygen
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Question 541 Mark
Why is Cuscuta, categorised as a parasite?
Answer
Cuscuta derives its nutrition using an association where it deprives its host of all valuable nutrients and absorbs them itself. Hence, it is called a parasitic plant.
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Question 551 Mark
The tiny openings present on the leaf surface. What are they called?
Answer
Stomata are the tiny pores present on the surface of leaves through which gaseous exchange takes place in plants.
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Question 561 Mark
How does growing pulses in the field help the soil?
Answer
Farmers add nitrogen containing manure or fertilisers to the soil to replenish the nutrients. Growing pulses in the soil replenishes nitrogen in the soil thus making thesoil healthier.
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Question 581 Mark
What is so special about the leaves that they can synthesise food but other parts of the plant cannot?
Answer
Leaves have the machinery for photosynthesis, i.e., chloroplasts, which contain green pigment.
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Question 591 Mark
Define nutrition.
Answer
Nutrition is the process in which an organism consumes food, which is then utilized by the body.
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Question 601 Mark
Fill in the blanks: The food synthesised by plants is stored as ___________.
Answer
The food synthesised by the plants is stored as starch.
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Question 611 Mark
What are insectivorous plants? Give an example.
Answer
Insect-eating plants are known as insectivorous plants. Example: pitcher plant.
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Question 631 Mark
Why algae present in stagnant water bodies are green in colour?
Answer
Because they contain green colour pigment chlorophyll.
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Question 651 Mark
Define parasites.
Answer
Parasites they are those organisms which grow on other plants or animals for their food, e.g. Cuscuta.
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Question 681 Mark
What do you understand by nutrition?
Answer
The process of utilising nutrients like carbohydrates, proteins, fats, etc., to generate energy is called nutrition.
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Question 691 Mark
A leguminous plant can restore the soil’s concentration of mineral nutrients. Can you give examples of some such plants?
Answer
Plants such as gram, pulses and beans are leguminous.
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Question 711 Mark
What do you understand by saprotrophic mode of nutrition?
Answer
The mode of nutrition in which organisms take their nutrients from dead and decaying matter is called saprotrophic mode of nutrition.
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Question 721 Mark
Define nutrients.
Answer
Carbohydrates, proteins, fats, vitamins and minerals are essential components of food, these components are called nutrients.
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Question 731 Mark
Why is nutrition essential?
Answer
Nutrition is necessary for the proper functioning of the body and for growth and development.
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Question 751 Mark
Name the various conditions that affect photosynthesis.
Answer
Intensity of light, temperature and concentration of carbon dioxide affect the rate of photosynthesis.
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Question 771 Mark
Insectivorous plants have one or the other specialised organs to catch their prey. What is that organ?
Answer
Leaves of insectivorous plants catches the prey.
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Question 781 Mark
What are the main requirements of photosynthesis?
Answer
Chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of Photosynthesis.
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Question 791 Mark
Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.
Answer
Carbohydrates in wheat dough encourage growth of yeast and other saprophytic fungi which break down carbohydrates, and emit a foul smell.
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Question 801 Mark
What do you mean by nutrition?
Answer
Nutrition is the mode of taking food by an organism and its utilisation by body.
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Question 811 Mark
Some organisms live together and share shelter and nutrients, this type of relationship is called.
Answer
Symbiotic relationship.
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Question 851 Mark
Chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of Photosynthesis.
Answer
Algae contain chlorophyll which gives them green colour and because of chlorophyll it can also prepare their own food by photosynthesis.
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Question 861 Mark
Lichens is a composite of which two organisms? What type of nutrition relationship exists here?
Answer
Two partners are Algae and Fungi. They exhibit symbiotic relationship. The fungus provides shelter, water and minerals to the alga and, in return, the alga provides food which it prepares by photosynthesis.
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Question 881 Mark
Why is the process of photosynthesis called an air purifying process?
Answer
During photosynthesis green plants take in carbon dioxide from the atmosphere and release oxygen as the end product. Thus, in the process they purify air.
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Question 891 Mark
Why are insectivorous plants called partial heterotrophs?
Answer
Insectivorous plants are autotrophs, i.e. they prepare their own food. They are partial heterotrophs as they eat insects for obtaining nitrogen.
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Question 901 Mark
A mutually beneficial relationship that occurs between two plants. It is known by what name? Give an example.
Answer
Symbiosis is the mutually benefitting association between two plants, e.g. lichens.
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Question 921 Mark
Mosquitoes, bed bugs, lice and leeches suck our blood. Can they be called as parasites?
Answer
Yes, these animals/ insects are parasites as they harm the hosts while they suck blood.
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Question 931 Mark
How do water and minerals absorbed by roots reach the leaves?
Answer
Water and minerals are transported to the leaves by the vessels which run like pipes throughout the roots, stem, branches and leaves. They form a continuous path orpassage for the nutrients to reach the leaf.
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Question 941 Mark
What is the function of guard cells of stomata?
Answer
Guard cells help in controlling the opening and closing of stomata for gaseous exchange.
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Question 951 Mark
Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below:
Water, minerals, ____________, ____________.
Answer
Sunlight/ light energy, carbon dioxide.
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Question 961 Mark
What is the function of stomata in leaf of a plant?
Answer
Stomata are the tiny pores present on the surface of leaves which helps in exchange of gases, the pores in stomata are surrounded by guard cells.
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Question 971 Mark
Define chlorophyll.
Answer
Chlorophyll is the green colour pigment which helps leaves to capture energy from sunlight to carry out the food making process of plants by the leaves.
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Question 991 Mark
Name the following: A plant that has both autotrophic and heterotrophic mode of nutrition.
Answer
Pitcher plant.
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Question 1001 Mark
Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials.
Available during day: .
Answer
Available during day: sunlight.
Available during day: sunlight (It is captured by chlorophyll in leaves and is converted into chemical energy).
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Question 1011 Mark
Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials. Available in the air: .
Answer
Available in the air: carbon dioxide.
Available in the air: carbon dioxide (Enters through the tiny pores called stomata on the surface of leaves).
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Question 1021 Mark
What are stomata?
Answer
These are tiny pores present on the surface of leaves. Through stomata exchange of gases i.e. Carbon Dioxide and Oxygen take place. Loss of water also take place through stomata called transpiration.
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Question 1041 Mark
Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials. Available in the plant: .
Answer
Available in the plant: chlorophyll.
Available in the plant: chlorophyll (Green pigment present in leaves that absorbs energy from sunlight).
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Question 1051 Mark
Plant cannot use the nitrogen present in the soil directly. Why?
Answer
Plants can use nitrogen only in soluble form while in soil nitrogen is present in inorganic form.
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Question 1061 Mark
What is the stored food form in sunflower seeds?
Answer
In sunflower seeds, glucose is stored in the form of oils (fats).
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