Weekly Test On Pinus - Dept Of Botany, Ddcw.

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  • 1/22 Questions

    Pinus produces

    • No seeds
    • Flowers
    • No Vascular tissues
    • Naked seeds in cones
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About This Quiz

This weekly test from the Dept of Botany at DDCW assesses knowledge on Pinus, covering its classification, anatomy, and physiological features. It evaluates understanding of Pinus's vascular structure, root associations, and reproductive biology, essential for students specializing in plant sciences.

Weekly Test On Pinus - Dept Of Botany, Ddcw. - Quiz

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  • 2. 

    Plant of pine is

    • Annual herb

    • Biannual herb

    • Evergreen tree

    • Deciduous tree

    Correct Answer
    A. Evergreen tree
    Explanation
    Pine plants are classified as evergreen trees because they retain their green foliage throughout the year. Unlike deciduous trees that shed their leaves in the fall, evergreen trees maintain their leaves or needles all year round. Pine trees are known for their needle-like leaves that stay green and provide a constant source of photosynthesis. This allows them to thrive in colder climates and adapt to various environmental conditions. Additionally, their evergreen nature enables them to continuously produce oxygen and provide shelter for wildlife throughout the year.

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  • 3. 

    What nature does pinus needle depicts

    • Mesophytic

    • Xerophytic

    • Hydrophytic

    • Sporophytic

    Correct Answer
    A. Xerophytic
    Explanation
    The correct answer is Xerophytic. Xerophytic nature refers to the adaptations of plants to survive in dry and arid conditions. Pinus needles are long, thin, and covered in a waxy cuticle, which helps to reduce water loss through transpiration. This adaptation allows Pinus trees to thrive in xeric environments with limited water availability.

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  • 4. 

    Annual rings are well seen in

    • Pinus wood

    • Pinus root

    • Pinus cones

    • None of the above

    Correct Answer
    A. Pinus wood
    Explanation
    Annual rings are well seen in Pinus wood because Pinus trees are known for their distinct growth patterns. Each year, a new layer of wood is added to the tree trunk, forming a ring. These rings can be observed when a tree is cut or a sample of wood is taken. By counting the number of rings, one can determine the age of the tree and also gather information about its growth rate and environmental conditions during different years. Therefore, Pinus wood is the correct answer as it clearly exhibits annual ring formation.

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  • 5. 

    The pollination in pinus is

    • Entemophilous

    • Anemophilous

    • Hydrophilous

    • Malscophilous

    Correct Answer
    A. Anemophilous
    Explanation
    Anemophilous refers to plants that are pollinated by wind. Pinus, commonly known as pine trees, have characteristics that make them well-suited for wind pollination. They produce large amounts of lightweight pollen that can be easily carried by the wind to reach female cones for fertilization. This method of pollination is efficient for pine trees as it allows for long-distance pollen dispersal and increases the chances of successful fertilization. Therefore, the correct answer for the pollination in pinus is anemophilous.

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  • 6. 

    Pinus belongs to the order

    • Cycadales

    • Coniferales

    • Cordaitales

    • Cycadofilicales

    Correct Answer
    A. Coniferales
    Explanation
    Pinus belongs to the order Coniferales because it is a genus of coniferous trees that produce cones and have needle-like leaves. Coniferales is the correct answer as it is the order that includes all conifers, which are plants that bear cones and have needle-like or scale-like leaves. This order also includes other well-known coniferous genera such as spruce, fir, and cedar. Therefore, Pinus fits into the Coniferales order based on its characteristics and classification.

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  • 7. 

    The megasporophyll of pinus consist of

    • Both bract and ovuliferous scales

    • Only bract scales

    • Only ovuliferous scales

    • None of the above

    Correct Answer
    A. Both bract and ovuliferous scales
    Explanation
    The megasporophyll of pinus consists of both bract and ovuliferous scales. This means that the structure includes both protective scales (bract scales) and scales that bear the ovules (ovuliferous scales).

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  • 8. 

    Pinus male and female reproductive structures occur

    • On different plant

    • On same branches

    • On different branches of the same plant

    • None of the above

    Correct Answer
    A. On different branches of the same plant
    Explanation
    In the case of Pinus, the male and female reproductive structures occur on different branches of the same plant. This is known as monoecious reproduction, where both male and female cones are present on the same individual tree. The male cones produce pollen, while the female cones contain ovules that can be fertilized by the pollen. This arrangement allows for cross-pollination between different branches of the same plant, promoting genetic diversity within the species.

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  • 9. 

    Vascular bundles in pinus are

    • Conjoint collateral Open 

    • Conjoint collateral close

    • Conjoint bicollateral open

    • Option 4

    Correct Answer
    A. Conjoint collateral Open 
    Explanation
    The correct answer is "Conjoint collateral Open". In Pinus, the vascular bundles are arranged in a conjoint manner, meaning they are arranged together in a single ring. They are also collateral, meaning the xylem and phloem are located next to each other within the bundle. Additionally, the vascular bundles are open, meaning there is no cambium present between the xylem and phloem.

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  • 10. 

    In pinus, the terminal portion of microsporophyll of male cone is called

    • Embryo sac

    • Bract scale

    • Ovule

    • Apophysis

    Correct Answer
    A. Apophysis
    Explanation
    The correct answer is Apophysis. In Pinus, the terminal portion of the microsporophyll of the male cone is called the apophysis. The apophysis is a specialized structure that helps in the dispersal of pollen grains. It often has a distinct shape or coloration that aids in attracting pollinators.

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  • 11. 

    Pinus is

    • Deciduous

    • Dioecious

    • Monoecious

    • None of these

    Correct Answer
    A. Monoecious
    Explanation
    Pinus is a type of tree that belongs to the conifer family. It is known for its evergreen nature, meaning it does not shed its leaves seasonally, so it is not deciduous. Pinus is also known to be monoecious, which means that it has separate male and female reproductive structures on the same tree. This allows for pollination and reproduction to occur within a single tree. Therefore, the correct answer is monoecious.

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  • 12. 

    The male cone of pinus is modified of

    • Long shoot

    • Needle leaves

    • Dwarf shoot

    • None of the above

    Correct Answer
    A. Dwarf shoot
    Explanation
    The male cone of Pinus is modified from a dwarf shoot. This means that the male cone is derived from a short, stunted branch or shoot on the pine tree. Unlike the long shoot, needle leaves, or none of the above options, the dwarf shoot specifically refers to the structure from which the male cone develops.

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  • 13. 

    Cataphylls are

    • Leaves of selaginella

    • Scaly leaves of pinus

    • Needles of pinu

    • Foliar leaves of pinus

    Correct Answer
    A. Scaly leaves of pinus
    Explanation
    Cataphylls are specialized leaves found in certain plants, including pinus (pine trees). These leaves are scaly in nature and serve various functions such as protection, support, and storage. Unlike true leaves, cataphylls are often smaller, modified, and have a different structure. In the case of pinus, the scaly leaves help reduce water loss and protect the tree from harsh environmental conditions. Therefore, the correct answer is "Scaly leaves of pinus."

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  • 14. 

    Mesophyll tissue of pinus needle is composed of

    • Armed parenchyma

    • Chlorenchyma

    • Spongy parenchyma

    • Transfusion tissue

    Correct Answer
    A. Spongy parenchyma
    Explanation
    The mesophyll tissue of pinus needle is composed of spongy parenchyma. Spongy parenchyma is a type of plant tissue that consists of loosely packed cells with large intercellular spaces. It is responsible for gas exchange and photosynthesis in the leaf. In pinus needles, the spongy parenchyma cells are located towards the lower surface of the needle, allowing for efficient gas exchange and maximizing the absorption of sunlight for photosynthesis.

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  • 15. 

    Male gametophyte in pinus is having

    • 1 prothallial cell

    • 2 prothallial cells

    • 3 prothallial cells

    • 4 prothallial cells

    Correct Answer
    A. 2 prothallial cells
    Explanation
    In Pinus, the male gametophyte, also known as pollen grain, consists of two prothallial cells. These cells are responsible for providing nourishment to the developing male gametes. The presence of two prothallial cells is a characteristic feature of the male gametophyte in Pinus.

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  • 16. 

    Among the following which does not belong to sporophytic generation in pinus

    • Roots

    • Endosperm

    • Dwarf shoot

    • Long shoot

    Correct Answer
    A. Endosperm
    Explanation
    The sporophytic generation in Pinus refers to the phase of the plant's life cycle where it produces spores. The roots, dwarf shoot, and long shoot are all structures that are part of the sporophytic generation in Pinus. However, the endosperm is not part of the sporophytic generation. Endosperm is a nutrient-rich tissue that is typically found in the seeds of flowering plants, not in the sporophytic generation of Pinus.

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  • 17. 

    Discharge of pollen grains in pinus known as

    • Pollen wind

    • Yellow shower

    • Pollen shower

    • Sulphur shower

    Correct Answer
    A. Sulphur shower
  • 18. 

    Type of root association found in Pinus

    • Mycorrhizal

    • Endomycorrhizal

    • Ectomycorrhizal

    • Both A and b

    Correct Answer
    A. Both A and b
    Explanation
    Pinus, commonly known as pine trees, have a type of root association called mycorrhizal. Mycorrhizal association refers to a mutually beneficial relationship between the roots of plants and fungi. In this association, the fungus helps the plant in absorbing nutrients, especially phosphorus, from the soil, while the plant provides the fungus with sugars produced through photosynthesis. Within mycorrhizal association, there are two types: endomycorrhizal and ectomycorrhizal. Endomycorrhizal association occurs when the fungus penetrates and colonizes the root cells, while ectomycorrhizal association occurs when the fungus forms a sheath around the root cells. Therefore, Pinus exhibits both endomycorrhizal and ectomycorrhizal associations, making the answer "Both A and b" correct.

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  • 19. 

    Identify the Pinus stem t.s

    • Option 1

    • Option 2

    • Option 3

    • None of the above

    Correct Answer
    A. Option 1
    Explanation
    Option 1 is the correct answer because it is the only option that mentions "Pinus stem t.s". The other options do not mention anything related to a Pinus stem or its transverse section. Therefore, Option 1 is the most appropriate choice for identifying the Pinus stem transverse section.

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  • 20. 

    In pinus male gametes are produced in the pollen tube by the division of which of the following cells

    • Body cell

    • Stalk cell

    • Tube cell

    • Prothallial cell

    Correct Answer
    A. Body cell
    Explanation
    In pinus, male gametes are produced in the pollen tube by the division of the body cell.

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  • 21. 

    Microsporophyll of pinus is euivalent to

    • Pollen grain of angiosperm

    • Stamen

    • Male gametophyte

    • Inflorescence

    Correct Answer
    A. Stamen
    Explanation
    The microsporophyll of Pinus is equivalent to the stamen. The stamen is the male reproductive organ in angiosperms that produces pollen grains. Similarly, the microsporophyll in Pinus produces microspores, which develop into pollen grains. Therefore, the microsporophyll of Pinus is functionally equivalent to the stamen in angiosperms.

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  • 22. 

    Endospore of pinus is

    • Male gametophyte

    • Female gametophyte

    • Sporophyte

    • None of the above

    Correct Answer
    A. Male gametophyte
    Explanation
    The correct answer is male gametophyte because in Pinus (a type of coniferous plant), the male gametophyte is represented by the pollen grain, which contains the male gametes (sperm cells). The pollen grain is responsible for fertilizing the female gametophyte (represented by the ovule) in order to produce seeds. Therefore, the endospore of Pinus is the male gametophyte.

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  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 11, 2020
    Quiz Created by
    Likitha
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