Botany MCQ Quiz - Objective Question with Answer for Botany - Download Free PDF

The correct answer is Zinc deficiency.

• Because of Zn deficiency in rice plants affected with the Khaira disease.
• Symptoms: Initially yellow color spots appear on leaves which later on turn to brown spots.
• These spots will appear on the upper side of the leaves.
• This disease will appear both in the nursery and main field. 

Important Points

• Khaira disease of Rice first appeared in India at Pantnagar, Uttarkhand, and was reported by Y. L. Nene.

Hence, Zinc deficiency leads to Khaira disease in rice which affects the plants and will also have an effect on the yield.

The correct answer is Aerenchyma.

• Aerenchyma provides buoyancy to aquatic plants to help them float.
  • It is a type of tissues that consist of thin-walled cells and large intercellular spaces adapted for internal circulation of air. It provides plant roots with oxygen under hypoxic conditions. 

Additional Information

• Tracheid- It is a type of water-conducting cell in the xylem which lacks perforations in the cell wall. These are non-living cells. 
• Guard cell- These cells surround each stoma and help in regulating the rate of transpiration by opening and closing the stomata.
• Sclerenchyma- These tissues are composed of dead cells that have heavily thickened walls containing lignin and high cellulose content. It also serves the function of providing structural support in plants.

Concept:

• SILK: It is a type of natural fibre or animal fibre. silkworm is responsible for spinning of silk and it is reared to obtain silk.
• Silk fibre is primarily made up of protein.

History of Silk:

• Silk was discovered around 3500 BC in China. It was shipped to other parts of the world through trade.
• Mulberry silk is the most common silk moth that is used for producing silk. 
• Rearing of the silkworm is known as sericulture.

Life Cycle of Silkworm: 

• Stage 1:The cycle starts when female silk moth lays eggs.
• Stage 2: The caterpillar of larvae is hatched from the eggs of the silkmoth and they feed on mulberry leaves and consume a large amount of these leaves for around 30 days.
• Stage 3::The silkworm spin a protective cocoon around itself.it is the size of a small cotton ball and is made of a single thread of silk.
• Stage 4: Then Pupa changes into an adult moth. The female moth lays eggs after mating and thus the life cycle of silkworm begins again.
• Eggs → Caterpillar → Cocoon → Butterfly

Explanation:

Silk fibres are proteins secreted by caterpillars → Correct.

The silk yam is obtained from the cocoon of the silk moth → Correct.

The larvae of silk moths are called as caterpillars → Correct.

The pupa develops into caterpillar → Incorrect.

Key Points

Photosynthesis:

• Photosynthesis is the process by which green plants and certain other organisms transform light energy into chemical energy.
• During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

• There are two types of photosynthetic processes: oxygenic photosynthesis and anoxygenic photosynthesis. 
• Oxygenic photosynthesis functions as a counterbalance to respiration by taking in the carbon dioxide produced by all breathing organisms and reintroducing oxygen to the atmosphere.
• Oxygenic photosynthesis is written as follows: 
• 6CO₂ + 12H₂O + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
• During oxygenic photosynthesis, light energy transfers electrons from water (H2O) to carbon dioxide (CO2), to produce carbohydrates.
• In this transfer, the CO2 is "reduced," or receives electrons, and the water becomes "oxidized," or loses electrons.
• Ultimately, oxygen is produced along with carbohydrates.

Therefore it is clear that Nitrogen does NOT form an essential part of the process of photosynthesis.

The correct answer is Drosera.

Key Points

Explanation:

• The animals which feed on other animals are called carnivorous animals.
• In plants also there are some plants that feed on insects. 
• Such plants are having modified leaves known as pitfall traps. 
• Insects are attracted to these traps.
• They get digested by the pitcher plant's digestive juices. 
• Other such plants are Drosera, dionaea, Utricularia, etc. 
• In pitcher plants, there are leaves for photosynthesis for preparing starch like other plants.
• It fulfils its nitrogen requirements from insects. 
• The area in which such plants grow lacks nitrogen in the soil. 

Drosera, pitcher plant, and Utricularia is the set of plants representing insectivorous plants.

Additional Information 

• Cuscuta is parasitic plant. 
• Algae has an autotropic mode of nutrition. 

Concept:

Photosynthesis: 

• The leaves have a green pigment called chlorophyll.
• It helps leaves to capture the energy of the sunlight.
• This energy is used to synthesise (prepare) food from carbon dioxide and water. Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis.

In the presence of sunlight Carbon dioxide + water → Carbohydrate + oxygen.

• Some plants, green algae, and cyanobacteria can perform photosynthesis.
• The process of photosynthesis is commonly written as

                   6CO2 + 6H2O + Sun-Light → C6H12O6 + 6O2

Plant cells have a cell wall to protect them and make them rigid structure.

Explanation:

1. Plants convert energy from sunlight into food stored as carbohydrate’s - Correct

2. Plants have chlorophyll. - Correct

3. Plant cells do not have cell walls. - Incorrect.

Additional Information

In the plant cells, there are different components and organelles for specific functions-

• Cell Wall – It is a rigid layer composed of cellulose. It is the outermost layer of the cell, below this cell membrane is present. The primary function of the cell wall is to protect and provide structural support to the cell.
• Cell Membrane – It is a semi-permeable membrane that helps in regulating and the substance for entry and exit inside and outside the cell.
• Nucleus – It is a vital part of the cell as it contains all the information or DNA of the cell and their heredity information for growth and cell division.
• Vacuole – Most of the part of the plant cell is occupied by the vacuole. It is surrounded by Tonoplast. The vital role of the vacuole is to provide support again the pressure of the cell wall.
• Golgi apparatus – They act as a transport system in the cell, as they transport various molecules to a different part of the cell.
• Ribosomes – They are the sites of protein synthesis, also termed as the protein factory of the cell.
• Mitochondrion – They break the complex molecules and produce energy and hence called the powerhouse of the cell.
• Lysosomes – They are termed suicidal bags as they hold the enzymes that are capable to digest the whole cell itself.

The correct answer is Collenchyma.

 Concept:

• Collenchyma is a specialized simple permanent tissue that provides support and flexibility to plants.
  • This tissue is made up of living cells having uneven thickenings of cellulose, pectin, and hemicellulose on the walls.
  • Cells possess chloroplast, then it is involved in manufacturing sugar and starch.
  • Provides tensile strength and flexibility to the plant body.

Explanation:

• Parenchyma- this tissue provides support to plants. It also stores food. So this option is not correct.

• Collenchyma- it allows easy bending of plant parts and provides flexibility. So the option is correct.
• Sclerenchyma- this tissue makes the plant hard and stiff. It is present in the husk of a coconut. So the option is not correct.

Additional Information

• Parenchyma is the most common and abundant tissue in plants which is made up of thin-walled living cells having a distinct nucleus.
  • The main function of parenchyma is to store and assimilate food. Hence, they are referred to as food storage tissues.
  • Serves as a packing tissue to fill the spaces between other tissues and maintain the shape and firmness of the plant.
  • Stores waste products of plants.
• Sclerenchyma is a lignified supportive tissue made up of thick-walled and lignified cells.
  • Provides mechanical strength to the plant.

The correct answer is Calyx.

Key Points

• Flowers contain the plant’s reproductive structures.
• A typical flower has four main parts - or whorls - known as the calyx, corolla, androecium, and gynoecium.
• The outermost whorl of the flower has green, leafy structures known as sepals.
  • The sepals, collectively called the calyx, help to protect the unopened bud.

Important Points

• The second whorl is comprised of petals - usually, brightly coloured - collectively called the corolla.
• The number of sepals and petals varies depending on whether the plant is a monocot or dicot. 
  • In monocots, petals usually number three or multiples of three; in dicots, the number of petals is four or five, or multiples of four and five.
  • Together, the calyx and corolla are known as the perianth.
• The third whorl contains the male reproductive structures and is known as the androecium.
  • The androecium has stamens with anthers that contain the microsporangia.
• The innermost group of structures in the flower is the gynoecium, or the female reproductive component(s).
• The carpel is the individual unit of the gynoecium and has a stigma, style, and ovary.
  • A flower may have one or multiple carpels.

The correct answer is Parasite.

Important Points

• Cuscuta is a parasitic plant.
• Since Cuscuta does not have chlorophyll, it cannot synthesize its own food by photosynthesis.
• It uses the nutrients of host plants for its growth.
• Other parasitic plants are - Rafflesia, Viscum, Nuytsia floribunda.
• Parasitic plants cause damage to the host plant.

The correct answer is Chlamydomonas.

• Chlamydomonas is found in stagnant water and on damp soil as well as freshwater, seawater, and even in snow.
• About Chlamydomonas-
  • Class: Chlorophyceae
  • Order: Chlamydomonadales
  • Scientific name: Chlamydomonas
  • Phylum: Chlorophyta
  • Higher classification: Chlamydomonadaceae

The correct answer is the apple tree.

 Key Points

• Apple, (Malus Domestica), the fruit of the domesticated tree Malus Domestica (family Rosaceae), is one of the most widely cultivated tree fruits.
• A scientific name is a formal system of naming species of living things by giving them a name composed of two parts both by using Latin words and they can also be formed by using words from other languages.

 Additional Information

The correct answer is Option 2, i.e., Cork. 

• In-Plant tissues, the cell walls of 'cork' are coagulated by 'suberin' which makes them impervious to water & gas molecules. 
• Protective tissues: 
  • These tissues provide fortification to the plant. 
  • They include two basic things which are known as the 'epidermis & cork'.
• The following table shows the components of protective tissues with respective features. 

  Components of Protective tissues	Features
  Epidermis	It is a layer of cell that makes up the outer casing in the plant. At certain places, the stomata perforate the epidermis. The stomata help in loss of gaseous exchange & water
  Cork	It is the external protective tissue that substitutes the epidermal cells in mature roots & stems. Cork cells lack intercellular gaps & lifeless. The cell walls of corks are coagulated by suberin which makes them impervious to water molecules & gas molecules.

Concept:

About Plant Reproduction:

• Sexual Reproduction is defined as the production of a (New organism) from Two-parents by making use of their (Gametes or Sex cells). Plants also have Male and Female sex organs are carried within the (Flower and the Seeds which are inside a Fruit).
• These plants are called (Angiosperms or Flowering plants) as they reproduce by the Sexual reproduction method. 
• Most of the plants contain Reproductive organs of both (Males and Females) in the flowers.

Parts of a flower and their functions:

• Sepals: Protect the unopened flower
• Petals: Maybe brightly colored to attract insects
• Stamens: The male parts of the flower (each consists of an anther held up on a filament)
• Anthers: Produce male sex cells (pollen grains)
• Carpel: Female reproductive part of the flower which consists of ovules (inside which the egg cells ultimately form), ovary, style, and stigma.
• Stigma: The top of the female part of the flower which collects pollen grains
• Ovary: Produces the female sex cells (contained in the ovules)
• Nectary: Produce a sugary solution called nectar, which attracts insect

Explanation:

The swollen bottom part of flower is Carpel.

• The (Male organ part) of a flower is called the (Stamen) and the (Female organ part) of a flower is called (Carpel). It helps in making the (Male Gametes) of the plant and that is present in Pollen grains.
• These Pollen Grains helps in making (Female Gametes or Egg cells) of the plant and are present in Ovules. The (Male Gametes) fertilize the (Female Gametes).
• The fertilized (Egg cells) grow in Ovules and become Seeds.
• When germinated, these Seeds started growing as (new Plants).

The correct answer is leaves

Explanation:

Photosynthesis - Food-Making Process in Plants - 

• In plants, leaves are the food factories.
• Hence, all the raw materials, like water and minerals, carbon dioxide must reach leaves.
• Chlorophyll, the green pigment present in leaves helps to capture the energy of the sunlight to synthesize (prepare) food from carbon dioxide and water.
• The process is called photosynthesis because the synthesis of food occurs in the presence of sunlight. 

Additional Information

Sweet Potato stored food in their root.

But make their food at leaves.

Based on whether plants have a well-differentiated body and the presence or absence of specialized tissues for transport, and the ability to bear seeds Kingdom Plantae (Plant Kingdom) is can be classified into 5 different groups.

• Thallophyta
  • The plant body is not differentiated from roots, stems, and leaves.
  • They are commonly called algae.
• Bryophyta
  • These are small terrestrial plants.
  • They show differentiation in the body design, with stem, leaf-like structures, and root-like structures.
• Pteridophyta
  • The plant body is differentiated into roots, stems, and leaves, apart from having a specialized tissue for conduction.
• Gymnosperms
  • Gymnosperms are plants with naked seeds.
• Angiosperms
  • Angiosperms are seed-bearing plants. Seeds develop inside tissues that get modified to form the fruit of the plant. 

Hence, we can conclude that plants are divided into 5 groups.