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CBSE Questions for Class 7 Biology Nutrition In Plants Quiz 3 - MCQExams.com
CBSE
Class 7 Biology
Nutrition In Plants
Quiz 3
Pitcher plant is:
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Parasite
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Symbiotic
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Saprophyte
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Insectivorous
Explanation
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas, e.g.,
Nepenthe
s or pitcher plant. These plants have modified leaves to form a vase-like structure to trap the insects.
Thus, the correct answer is option D.
Photosynthesis occurs in the ________ of the plants.
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Roots
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Flowers
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Leaves
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Fruits
Explanation
Photosynthesis is the process by which the light energy from the sun is captured by the chlorophyll pigments present on the leaves (mostly leaves, in few plants, stem also contributes in photosynthesis) and is used for the preparation of food. This process requires raw materials like carbon dioxide and water.
Thus, the correct answer is option C.
Plants which synthesize their food themselves are called saprotrophs.
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True
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False
Explanation
Plants which synthesise their food themselves are called autotrophs. That is, it doesn't depend on other organisms for food, using sunlight and water the plants makes their own food. They are considered as the producers in a food chain. Saprotrophs are the plants which feeds from the dead and decayed organic matters knows as detritius. Major saprotroph group includes fungi, bacteria and water molds.
So, the correct answer is option B.
Insectivorous plants are adopted to soils:
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Rich in water
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Dificient in water
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Deficient in nitrogenous compounds
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Deficient in trace elements
Explanation
Insectivorous plants are adapted to live in soils deficient in nitrogenous compounds. These plants obtain the nitrogen for their nutrition from amino acids derived from digesting the proteins of the trapped insects.
So, the correct answer is option C.
Insectivorous plants grow in areas deficient in
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Phosphorus
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Nitrogen
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Sulphur
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Iron
Explanation
Insectivorous plants grow in areas deficient in nitrogen because they are able to meet the requirements of nitrogen in their body by feeding on the insects.
So, the correct answer is 'Nitrogen'.
Photosynthetic autotrophs get their energy requirement from:
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Heat
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Light
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Inorganic chemicals
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Organic chemicals.
Explanation
Autotrophic nutrition is a mode of nutrition in which organism prepares their food by their own with the help of organic materials available in nature.
Photosynthetic autotrophism is a mode of nutrition in which an organism prepares their food with the help of organic materials in the presence of sunlight.
Plants are examples of photosynthetic autotrophs. Photosynthetic autotrophs get their requirement from light.
The process by which photosyntheitic autotrophs prepare their food is known as photosynthesis. In the presence of light, with the help of carbon dioxide and water, glucose is formed.
Hence, the correct answer is option B.
In symbiosis, Organisms share
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Food
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Shelter
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Both A and B
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None of the above
Insectivorous plants usually survive in
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Water rich soil
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$$N_2$$ deficient soil
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$$N_2$$ rich soil
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Sugar deficient medium
Explanation
Insectivorous plants can survive in $$N_2$$ deficient soil as they trap $$N_2$$ from the insects. The insectivorous plants secrete the sticky mucus which traps the insects. The digestive enzymes act on the proteins of the insects and break it into simpler compounds and it is assimilated by the plants in form of nitrogen.
So, the correct answer is option B.
Which of the following is true about saprophytes?
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They trap insects to meet their nitrogen requirement.
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They live on decaying organic matter.
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They share their food and shelter.
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Saprophytes contain chlorophyll.
Explanation
A saprophyte or saprotroph is an organism that gets its nutrition and energy from dead and decaying organic matter. These may be decaying parts of plants or animals. This means that saprophytes are heterotrophs. They are consumers in the food chain. This is a phenomenon observed in Fungi.
So, the correct answer is 'B'.
Carbon dioxide is released during photosynthesis.
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True
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False
Explanation
During photosynthesis Carbon dioxide is not released instead it produces Oxygen.
There are three components required for the photosynthesis to takes place, they are light energy, water and Carbon dioxide.
This is then used to produce Glucose and Oxygen.
So, the correct answer is option B.
Saprophytes are likely to grow on:
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Bread pieces
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Pickles when kept in moist places
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On the ground after rains
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All of the above
Explanation
Organisms that live and feed on dead organic materials and obtain nutrition for their growth are known as saprophytes. Example–
Mucor
, yeast.
Saprophytes contain tubular structures known as hyphae that are responsible for producing digestive enzymes thereby breaking down complex matter into simpler ones.
They can grow anywhere that is warm and damp be it staled bread pieces, any other food like pickles and even in soil after rain.
So, the correct answer is D.
Match column - I with column - II and select the correct option from the codes given below.
Column - I
Column - II
(a)
Chlorophyll
(i)
Rhizobium
(b)
Symbiosis
(ii)
Starch
(c)
Insectivorous plant
(iii)
Lichen
(d)
Nitrogen fixing organism
(iv)
Mistletoe
(e)
Partial parasite
(v)
Pitcher plant
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(a) - (i), (b) - (iv), (c) - (iii), (d) - (ii), (e) - (v)
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(a) - (iii), (b) - (v), (c) - (ii), (d) - (i), (e) - (iv)
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(a) - (ii), (b) - (iii), (c) - (v), (d) - (i), (e) - (iv)
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(a) - (v), (b) - (iv), (c) - (i), (d) - (ii), (e) - (iii)
Choose the correct answer from the alternatives given.
What are the products of photosynthesis
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Water and carbon dioxide
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Water and oxygen
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Oxygen and carbohydrate
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Carbohydrate and water
Explanation
The main product of photosynthesis is glucose, which is the carbohydrate molecule that produces energy to run the processes of the cell. Oxygen is mainly a byproduct of the process of photosynthesis. Six molecules of carbon dioxide and six molecules of water are needed to produce one molecule of glucose.
Thus, the correct answer is 'Oxygen and carbohydrate.'
Nitrite is oxidised to nitrate with the help of
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Nitrosomonas
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Nitrococcus
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Nitrobacter
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Thiobacillus
A symbiotic association of an alga and a fungus is termed as a:
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Lichen
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Coral
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Mycorrhiza
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Parasite
Explanation
$$\textbf {Correct Option (B):} $$
$$\textbf {Solution:} $$
$$\textbf {Option (A):} $$
$$\bullet$$ Lichen is the symbiotic association happening between algae and fungi.
$$\bullet$$ In lichen fungi provides water and nutrients to algae using their hyphae network in the soil that absorbs all water and minerals.
$$\bullet$$ The algae uses that minerals and water and photosynthesize and produce food. This food is absorbed by the fungi as they are saprophytic.
$$\textbf {Option (B):} $$
$$\bullet$$ Corals are huge structures that let the algae ad other fishes and crabs live within.
$$\bullet$$ Algae provides nutrition to the corals and coral provide shelter.
$$\textbf {Option (C):} $$
$$\bullet$$ Mycorrhiza is the association of fungi with plants.
$$\bullet$$ Fungi with their hyphal network in the soil increases the water-absorbing ability of the plant.
$$\bullet$$ The fungus extracts nutrients from roots that are provided to them by the leaves.
$$\textbf {Option (D):} $$
$$\bullet$$ Parasites are organisms that feed on other organisms for their nutrient needs.
$$\bullet$$ Cuscuta is a well-known parasite that feeds on trees and absorbs food from the leaves.
Hence, the option(B) is the correct answer.
How is the plant benefited by the bacteria which takes shelter in the root of the plants?
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The bacteria fixes the nitrogen for the plant.
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The bacteria protects the plant from pathogens.
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Both A and B
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None of the above
Explanation
Nitrogen is present in abundance in the atmosphere but the plant cannot absorb atmospheric nitrogen. Plants get nitrogen from the soil. Certain types of bacteria called
Rhizobium
present in the soil take shelter in the root of the plants. They convert gaseous nitrogen into a usable form and release it for the plants. Plants absorb these soluble forms of nitrogen along with water and other minerals.
This type of nitrogen fixation is observed in plants like peas, moong, beans, and other legumes. By this process, both bacteria and plants get benefited mutually.
So, the answer is A.
The nodules present in the leguminous plants appear pink in colour due to the presence of
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RBC.s
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leghaemoglobin
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nitrogenase enzyme
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bacterial secretion
Which one of the following conditions need not be present for photosynthesis to proceed?
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Water
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Oxygen
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Light
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Chlorophyll
Explanation
Photosynthesis requires only $$CO_2$$, light and water, and takes place in the chlorophyll of the chloroplast of leaves. Oxygen is formed in photosynthesis and is not required.
So, the correct option is, 'Oxygen'.
Which of the following statements is incorrect about leghaemoglobin?
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It acts as $$O_2$$ scavenger
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It imparts pink or red colour to the nodules
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It combines with $$O_2$$ and protects nitrogenase
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It is a Mo-Fe protein.
_______ conditions are created by leghaemoglobin in the root nodule of a legume.
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Aerobic
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Anaerobic
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Acidic
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Alkaline
Function of leghaemoglobin (a red pigment) in root nodules of leguminous plants is:
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To regulate $$O_2$$ supply in cells.
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To regulate $$CO_2$$ supply in cells.
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To regulate production of phenolic compounds.
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To regulate the Mo supply in cells.
Explanation
Leghemoglobin supports the centralization of free oxygen in the cytoplasm of contaminated plant cells to guarantee the best possible capacity of root knobs.
Its capacity is to help give oxygen to the breathing harmonious bacterial cells in root nodules of leguminous plants in a way practically equivalent to hemoglobin transporting oxygen to breathing tissues in creatures.
Thus, the correct answer is option A- 'to regulate O$$_2$$ supply in cells.'
Stomata are present on the underside of the __________.
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Flower
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Fruit
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Seed
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Leaf
Organisms which prepare food for themselves using simple naturally available raw materials are referred to as
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Heterotrophs
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Autotrophs
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Parasites
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Saprophytes
Explanation
An organism that prepares food for itself using Carbon dioxide, water in the existence of 'sunlight' and 'chlorophyll' is referred to as 'autotrophs'.
Heterotrophs depend on other autotrophs for nutrition.
Parasites live inside other organisms and depend on that organism for nutrition.
Saprophytes feed on dead decaying organisms.
Thus, the correct answer is option (b).
The term that is used for the mode of nutrition in yeast, mushroom and bread mould is ________.
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Autotrophic
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Insectivorous
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Saprophytic
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Parasitic
Explanation
Yeast
, mushroom, and bread mould (
Rhizopus
) are saprophytic because they obtain food from decaying and dead matter.
So, the correct answer is option (C).
Which of the following statements is/are correct?
i) All green plants can prepare their own food.
ii) Most animals are autotrophs.
iii) Carbon dioxide is not required for photosynthesis.
iv) Oxygen is liberated during photosynthesis.
Choose the correct answer from the options below.
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(i) and (iv)
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(ii) only
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(ii) and (iii)
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(i) and (ii)
Explanation
All the green plants are - producers, so they make their own food.
Animals don't make their own food. They are heterotrophs.
Carbon dioxide and water are required for the process of photosynthesis in plants.
Oxygen liberates in the process of photosynthesis.
Statement (I) and (iv) are the correct statements.
The correct answer is (a).
Select the correct statement(s).
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Heterotrophs do not synthesise their own food.
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Heterotrophs utilise solar energy for photosynthesis
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Heterotrophs synthesise their own food
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Heterotrophs are capable of converting carbon dioxide and water into carbohydrates.
Explanation
A. Heterotrophs do not synthesise their own food.
Solution : Heterotrophs are the organisms that cannot synthesize their own food and derive it from other sources directly or indirectly and autotrophs are the organisms like plants that synthesize their own food by help of co2 and water.
So the correct answer is " Heterotrophs do not synthesise their own food.".
Identify the part of the cell by the hints given:
*This part of the cell is present in
ALL
cells. It is the gel-like substance that provides cell shape.
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Cytoplasm
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Chromosomes
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Nucleus
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Cell membrane
Explanation
The gel like substance which give shape to cell is called Cytoplasm. Option A is correct.
What cell part is NOT present in all the cells?
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Cell Wall
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Genetic material
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Cell membrane
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Cytoplasm
Explanation
Cell wall is only found in plant cells and not in any other cells. Option A is correct.
Why are most cells so small?
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We can see them with a microscope.
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They can fit in our bodies.
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They can reproduce quickly.
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They can take in food and get rid of waste.
Explanation
Cells are so little, so they can maximize their ratio of surface area to volume. Smaller cells have a higher ratio which allows more molecules and ions to move across the cell membrane per unit of cytoplasmic volume. Cells are so small because they need to be able to get the nutrients in and the waste out quickly.
The nutrients need to be added from time
to time to enrich the soil.
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True
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False
Explanation
Fertilisers and manures contain nutrients such as nitrogen,potassium, phosphorous, etc.
These nutrients need to be added from time to time to enrich the soil. Then Farmers or gardeners can grow plants and keep them healthy if the nutrient requirement
of plants is fulfilled.
The statement is true.
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