Every question from past board papers on Structural Organisation in Animals and Plants, newest paper first. Open any question for its full worked answer.
Given below are two statements :
Statement I : In a floral formula ⊕ stands for zygomorphic nature of the flower, and G (underlined) stands for inferior ovary.
Statement II : In a floral formula ⊕ stands for actinomorphic nature of the flower and G (underlined) stands for superior ovary.
In the light of the above statements, choose the correct answer from the options given below :
Find the statement that is NOT correct with regard to the structure of monocot stem.
In the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called :
Match List I with List II :
List I: A. Scutellum B. Non-albuminous seed C. Epiblast D. Perisperm
List II: I. Persistent nucellus II. Cotyledon of Monocot seed III. Groundnut IV. Rudimentary cotyledon
Choose the option with all correct matches.
Which of the following is an example of a zygomorphic flower?
Given below are two statements:
Statement I : Parenchyma is living but collenchyma is dead tissue.
Statement II : Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.
In the light of the above statements, choose the correct answer from the options given below:
Identify the type of flowers based on the position of calyx, corolla and androecium with respect to the ovary from the given figures (a) and (b)
Identify the part of the seed from the given figure which is destined to form root when the seed germinates.
Which of the following is an example of actinomorphic flower?
Bulliform cells are responsible for
In the given figure, which component has thin outer walls and highly thickened inner walls?
Match List I with List II
List I (Types of Stamens): A. Monoadelphous; B. Diadelphous; C. Polyadelphous; D. Epiphyllous
List II (Example): I. Citrus; II. Pea; III. Lily; IV. China-rose
Choose the correct answer from the options given below:
Match List I with List II
List I: A. Rose; B. Pea; C. Cotton; D. Mango
List II: I. Twisted aestivation; II. Perigynous flower; III. Drupe; IV. Marginal placentation
Choose the correct answer from the options given below:
Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.
Axile placentation is observed in
Given below are two statements :
Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II : Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Late wood has fewer xylary elements with narrow vessels.
Reason R : Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below :
Identify the correct statements :
A. Lenticels are the lens-shaped openings permitting the exchange of gases.
B. Bark formed early in the season is called hard bark.
C. Bark is a technical term that refers to all tissues exterior to vascular cambium.
D. Bark refers to periderm and secondary phloem.
E. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below :
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason R : Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.
In the light of the above statements, choose the correct answer from the options given below :
Which of the following is not observed during apoplastic pathway ?
Read the following statements about the vascular bundles :
(a) In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
(b) Conjoint closed vascular bundles do not possess cambium
(c) In open vascular bundles, cambium is present in between xylem and phloem
(d) The vascular bundles of dicotyledonous stem possess endarch protoxylem
(e) In monocotyledonous root, usually there are more than six xylem bundles present
Choose the correct answer from the options given below :
The flowers are Zygomorphic in :
(a) Mustard
(b) Gulmohar
(c) Cassia
(d) Datura
(e) Chilly
Choose the correct answer from the options given below :
In old trees the greater part of seco[...] dark brown and resistant to insect attack due [...]
(a) secretion of secondary metabolites and their deposition in the lumen of vessels.
(b) deposition of organic compounds like tannins and resins in the central layers of stem.
(c) deposition of suberin and aromatic substances in the outer layer of stem.
(d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
(e) presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below :
Identify the correct set of statements :
(a) The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea
(b) Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin
(c) Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves
(d) Rhizophora shows vertically upward growing roots that help to get oxygen for respiration
(e) Subaerially growing stems in grasses and strawberry help in vegetative propagation
Choose the correct answer from the options given below :
Which one of the following plants shows vexillary aestivation and diadelphous stamens ?
"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which :
Which part of the fruit, labelled in the given figure makes it a false fruit ?
The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.
(a) It is also called as the earlywood
(b) In spring season cambium produces xylem elements with narrow vessels
(c) It is lighter in colour
(d) The springwood along with autumnwood shows alternate concentric rings forming annual rings
(e) It has lower density
Choose the correct answer from the options given below :
Match List - I with List - II.
List - I | List - II
(a) Cells with active cell division capacity | (i) Vascular tissues
(b) Tissue having all cells similar in structure and function | (ii) Meristematic tissue
(c) Tissue having different types of cells | (iii) Sclereids
(d) Dead cells with highly thickened walls and narrow lumen | (iv) Simple tissue
Select the correct answer from the options given below.
Match List - I with List - II.
List - I | List - II
(a) Lenticels | (i) Phellogen
(b) Cork cambium | (ii) Suberin deposition
(c) Secondary cortex | (iii) Exchange of gases
(d) Cork | (iv) Phelloderm
Choose the correct answer from the options given below.
Diadelphous stamens are found in :
Match Column - I with Column - II.
Column - I (floral formulae) | Column - II
(a) %♀♂ K(5) C1+2+(2) A(9)+1 G̱(1) | (i) Brassicaceae
(b) ⊕♀♂ K(5) C(5) A5 G̱(2) | (ii) Liliaceae
(c) ⊕♀♂ P(3+3) A3+3 G̱(3) | (iii) Fabaceae
(d) ⊕♀♂ K2+2 C4 A2−4 G̱(2) | (iv) Solanaceae
Select the correct answer from the options given below.
Select the correct pair.
The roots that originate from the base of the stem are :
Ray florets have :
Identify the incorrect statement.
The transverse section of a plant shows following anatomical features :
(a) Large number of scattered vascular bundles surrounded by bundle sheath.
(b) Large conspicuous parenchymatous ground tissue.
(c) Vascular bundles conjoint and closed.
(d) Phloem parenchyma absent.
Identify the category of plant and its part :
The ovary is half inferior in :
Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :
Xylem translocates :
Which of the statements given below is not true about formation of Annual Rings in trees ?
Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part, is :
Phloem in gymnosperms lacks :
Pneumatophores occur in
Sweet potato is a modified
Plants having little or no secondary growth are
Casparian strips occur in
Secondary xylem and phloem in dicot stem are produced by
Stomata in grass leaf are
Identify the wrong statement in context of heartwood :
Root hairs develop from the region of :
Which of the following facilitates opening of stomatal aperture ?
The vascular cambium normally gives rise to :
The morphological nature of the edible part of coconut is :
Coconut fruit is a :
In Bougainvillea thorns are the modifications of :
Which of the following is made up of dead cells ?
The standard petal of a papilionaceous corolla is also called :
Tricarpellary, syncarpous gynoecium is found in flowers of :
Proximal end of the filament of stamen is attached to the :
Which of the following is not a stem modification ?
Cotyledon of maize grain is called :
Specialised epidermal cells surrounding the guard cells are called :
Stems modified into flat green organs performing the functions of leaves are known as :
Match Column—I with Column—II and select the correct option using the codes given below :
Column—I: a. Pistils fused together; b. Formation of gametes; c. Hyphae of higher Ascomycetes; d. Unisexual female flower
Column—II: (i) Gametogenesis; (ii) Pistillate; (iii) Syncarpous; (iv) Dikaryotic
Codes: a b c d
The term 'polyadelphous' is related to
How many plants among *Indigofera*, *Sesbania*, *Salvia*, *Allium*, *Aloe*, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?
Radial symmetry is found in the flowers of
Free-central placentation is found in
Cortex is the region found between
The balloon-shaped structures called tyloses
