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

• Plant tissues are broadly divided into 2 groups based on their capability of division - 
  • Meristematic tissue - have the capability of active cell division.
  • Permanent tissue - usually do not divide.
• Meristems consist of undifferentiated cells and can be further divided on the basis of their location.

1. Apical Meristem - 
   • It produces the primary tissue and occurs at the tip of the root and shoot.
   • They help in elongation of the root and the stem.
2. Lateral Meristem - 
   • It is present at the mature parts of the root and the stem.
   • It is responsible for increase in the girth and thickness of the stem.
   • They appear later than primary meristems and hence, also called secondary meristem.
3. Intercalary Meristem - 
   • It is the meristem which occur between the mature tissues.
   • They occur at the base of leaves or nodes and may help in elongation of internodes.
   • They also occur in grasses, where they regenerate the lost parts grazed off by the herbivores.

​Hence, the correct answer is option 3.

The correct answer is Lactic acid is produced in our muscles when oxygen is plentiful, and it does not cause cramps.
Key Points

• (a) The break-down of glucose, a six-carbon molecule, into a three-carbon molecule called pyruvate takes place in cytoplasm.
  • This statement is correct. 
• (b) Aerobic respiration takes place in the mitochondria and produces more energy compared to anaerobic respiration.
  • This statement is also correct. In aerobic respiration, glucose is broken down using oxygen to produce a lot more energy in the form of ATP. This process takes place in the mitochondria and results in the production of carbon dioxide and water.
• (c) When the terminal phosphate linkage in ATP is broken using oxygen, the energy equivalent to 30.5 kJ/mol is released.​
  • This statement is incorrect. When the terminal phosphate linkage in ATP is broken using water, the energy equivalent to 30.5 kJ/mol is released.
• (d) ATP is synthesized during cellular respiration and used to fuel various life processes.
  • This statement is correct. ATP (Adenosine Triphosphate) is synthesized during both aerobic and anaerobic respiration. It acts as the primary energy currency for cellular activities, driving endothermic reactions in the cell.

Important Points

• Anaerobic respiration: Occurs without oxygen, produces ethanol and carbon dioxide (in yeast) or lactic acid (in animals), but releases less energy.
• Aerobic respiration: Occurs with oxygen, produces carbon dioxide and water, and releases much more energy than anaerobic respiration.
• Lactic acid production: Happens when oxygen is low, not plentiful, leading to muscle cramps during intense physical activity.

The correct answer is: Because electrical impulses can only reach cells connected by nervous tissue.

Key Points

• Electrical impulses are a common means of communication between cells in multicellular organisms.

  • They only reach cells connected by nervous tissue.

• Hence, the statement in option 1 is CORRECT.

  • Once transmitted, the cell requires time to reset before generating a new impulse.

  • This means cells cannot continually create and transmit electrical impulses.

• Chemical communication is an alternative to electrical impulses.

  • Stimulated cells release a chemical compound instead of an electrical impulse.

  • The chemical compound diffuses around the original cell.

  • Nearby cells can detect this compound using special molecules on their surfaces.

  • Chemical signals can reach all cells in the body, even without nervous tissue connections.

  • This method is slower but steady and persistent.

• Hormones are a key form of chemical communication in multicellular organisms.

  • Hormones show great diversity and are used for control and coordination.

  • They help regulate growth, development, and responses to environmental stimuli.

  • Hormones are synthesized in places distant from where they act and diffuse to their target areas.

The correct answer is Transport of water.

Key Points

• Xylem is a specialized tissue in vascular plants responsible for the transport of water and dissolved minerals from the roots to different parts of the plant.
• The movement of water through the xylem occurs due to a process called transpiration pull, which is driven by water evaporation from the stomata in leaves.
• Xylem consists of tracheids and vessel elements, which are the primary water-conducting cells. These cells are dead at maturity, forming hollow tubes for efficient water transport.
• The direction of water movement in xylem is unidirectional (upward from roots to shoots).
• In addition to water transport, xylem also provides mechanical support to the plant due to the presence of lignin in its cell walls.

Additional Information

• Phloem: Another vascular tissue in plants responsible for the transport of food, such as sugars, from sources (like leaves) to sinks (like roots or fruits).
• Transpiration: The process of water evaporation from the aerial parts of plants, primarily through stomata, creating a negative pressure that facilitates the upward movement of water in xylem.
• Lignin: A complex organic polymer found in the cell walls of xylem tissues, providing strength and waterproofing to the plant's vascular system.
• Root Pressure: A phenomenon where osmotic pressure in the roots pushes water upward through the xylem, particularly at night or when transpiration is low.
• Vascular Bundle: A structural unit in plants that contains both xylem and phloem, enabling efficient transport of water, nutrients, and food throughout the plant.

The correct answer is Hemiparasites.

Key Points

• Hemiparasites are parasitic plants that can perform photosynthesis but depend on their host plants for water and nutrients.
• They usually have green leaves that enable them to produce their own food through photosynthesis.
• Hemiparasites attach to the host plant using structures called haustoria to extract water and minerals.
• Examples of hemiparasitic plants include mistletoes and certain species within the Loranthaceae family.

Important Points

• Hemiparasites can survive without their host for short periods due to their ability to photosynthesize.
• They play a role in ecosystems by affecting host plant populations and contributing to nutrient cycling.

Additional Information

• Semiparasites: These are parasitic plants that partially depend on their host for survival but can also perform photosynthesis independently. They are similar to hemiparasites but may rely less on their host.
• Microparasites: Microparasites are microorganisms, such as bacteria, viruses, and fungi, that parasitize their host. They are not photosynthetic and are unrelated to parasitic plants.
• Holoparasites: Holoparasites are fully parasitic plants that lack chlorophyll and cannot perform photosynthesis. They depend entirely on their host for all nutrients and energy. Examples include Rafflesia and dodders.

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

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.

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.