Which of the following part elongates directly and leads to the formation of primary roots?
bud
radicle
plumule
root hair
Correct Answer :
B. radicle
The direct elongation of the radicle leads to the formation of primary roots which grows inside the soil. The radicle is the first part of a seedling (a growing plant embryo) to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil (the shoot emerges from the plumule).
Related Questions
Which of the following is an example of pinnately compound leaf ?
Cucumber
Papaya
Cucurbita
Neem
Which one of the following statement is correct?
Bulb of Allium cepa is a modified stem.
Cloves of Allium sativum are fleshy scale leaves.
Corm of Colocasia is a modified root.
Tendril in Vitis vinifera is a modified axillary bud.
Which one of the following structure is not associated with gynoecium?
Ovary
Style
Stigma
Filament
The root differs from stem in having
nodes and internodes
axillary buds
multicellular hairs
unicellular hairs
Statement-1 : Ginger has a prostrate-growing rhizome.
Statement-2 : Shoot growth is not effected by gravity.
Statement-1 and statement-2 are true and Statement-2 is a correct explanation for statement-1.
Statement-1 and statement-2 are true but statement-2 is a correct explanation for statement-1.
Statement-1 is true and statement-2 is false.
Both the statements are false.
The given figure shows a typical structure of monocotyledonous seeds. Identify A, B, C, D and E parts marked in the given figures.
A - Endosperm, B - Embryo, C - Scutellum, D - Coleorhiza, E - Coleoptile
A- Embryo, B - Endosperm, C - Scutellum, D - Coleoptile, E - Coleorhiza
A - Endosperm, B - Embryo, C - Scutellum, D - Coleoptile, E - Coleorhiza
A - Embryo, B - Endosperm, C - Scutellum, D - Coleorhiza, E - Coleoptile
Prop roots of banyan tree are meant for
respiration.
absorption of water from soil.
providing support to big tree.
all of the above.
Given figures (A, B and C) shows the position of floral parts on thalamus. (given as I, II and III) Select the correct combination.
- Hypogynous flower
- Perigynous flower
- Epigynous flower
A-I, B-II, C-III
A-I, B-III, C-II
A-III, B-II, C-I
A-III, B-I, C-II
Which of the following is a modified stem for the protection of plants from browsing animals?
Tendrils
Thorns
Rhizome
Tuber
A sterile stamen is known as
staminode
anther
pollen grain
filament
Match the following stem modifications given in column I with their examples given in column II and select the correct combination from the options given below.
| (Stem Modifications) | (Found in) |
|---|---|
| A. Underground stem | I. Euphorbia |
| B. Stem tendril | II. Opuntia |
| C. Stem thorns | III. Potato |
| D. Flattened stem | IV. Citrus |
| E. Fleshy cylindrical stem | V. Cucumber |
A I, B II, C III, D V, E IV
A II, B III, C IV, D V, E I
A III, B IV, C V, D I, E II
A III, B V, C IV, D II, E I
Which one of the following characteristics is not related to gynoecium?
It is the female reproductive part of the flower.
It is composed of stamens.
Stigma is usually at the tip of the style and is the receptive surface for pollen grains.
Each ovary bears one or more ovules attached to a flattened, cushion like placenta.
Which one of the following characteristics does not belong to parietal placentation?
Ovules are borne on central axis.
Ovary is one-chambered but it becomes two-chambered due to the formation of false septum.
Examples are mustard and Argemone.
Both (b) and (c)
Cotyledons and testa respectively are edible parts in which of the following group?
walnut and tamarind
cashew nut and litchi
french bean and coconut
groundnut and pomegranate
Stilt roots occur in __________ .
groundnut
rice
sugarcane
wheat
The given figure (A, B, and C) shows different types of roots. Identify the root which is seen in wheat plant and originate from the base of the stem?
A
B
C
Both A and B
Which of the following represents the floral characters of liliaceae?
Six tepals, zygomorphic, six stamens, bilocular ovary, axile placentation.
Actinomorphic, polyphyllous, unilocular ovary, axile placentation.
Tricorpellary, actinomorphic, polyandrous, superior ovary, axile placentation.
Bisexual, zygomorphic, gamophyllous, inferior ovary, marginal placentation.
When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is known as
actinomorphic
zygomorphic
asymmetric
bisymmetric
The part of the root which is most active in water absorption is called
root cap
maturation zone
meristematic zone
zone of elongation
A - Which one of the option shows the correct labelling of the parts marked as A, B, C and D in a typical structure of dicotyledonous seeds ?
A - Hilum, B - Micropyle, C - Radicle, D - Cotyledon, E - Plumule
A - Hilum, B - Micropyle, C - Plumule, D - Cotyledon, E - Radicle
A - Micropyle, B - Hilum, C - Plumule, D - Cotyledon, E - Radicle
A - Hilum, B - Micropyle, C - Plumule, D - Radicle, E - Cotyledon
Which of the following part elongates directly and leads to the formation of primary roots?
bud
radicle
plumule
root hair
Fibrous roots develop in maize from
upper nodes
lower nodes
upper internodes
none of these
The given figures (A and B) shows the modificaiton of roots.Which of the following statements regarding the figures is correct ?
Tap roots of carrot, turnip and adventitious root of sweet potato, get swollen and store food.
Pneumatophores conducts water, minerals & photosynthesis
Pneumatophore is found in the plants that grow in sandy soil.
Turnip & carrot shows adventitious roots and sweet potato shows tap root.
Which of the following statements are correct about the leaf?
- Leaf is a lateral, generally flattened structure borne on the stem.
- It develops at the node and bears a bud in its axil.
- Leaves originate from root apical meristems and arranged in an acropetal order.
- They are the most important vegetative organs for reproduction.
(i) and (ii)
(ii) and (iii)
(i), (ii) and (iv)
all of these
Root hairs develop from
region of maturation
region of elongation
region of meristematic activity
root cap
A branch in which each node bearing a rossette of leaves and a tuft of roots is found in aquatic plants like _________ and _________.
Hydrilla and Pistia
Eichhornia and Hydrilla
Pistia and Eichhornia
Pistia and Vallisneria
Read the following statements and answer the question.
- It is the pattern of arrangement of leaves on the stem or branch.
- It is usually of three types - alternate, opposite and whorled.
- It is meant for getting maximum amount of light. statements?
Phyllotaxy
Venation
Inflorescencew
Aestivation
Identify the different types of aestivation (A, B, C and D) in corolla and select the correct option.
A-Valvate, B-Twisted, C-Imbricate, D-Vexillary
A-Vexillary, B-Valvate, C-Twisted, D-Imbricate
A-Imbricate, B-Vexillary, C-Valvate, D-Twisted
A-Twisted, B-Imbricate, C-Vexillary, D-Valvate
Statement 1 : A simple leaf has undivided lamina.
Statement 2 : Leaves showing pinnate and palmate venations have various type of incisions.
Statement-1 and statement-2 are true and statement-2 is a correct explanation for statement -1.
Statement -1 and statement -2 are true but statement-2 is not a correct explanation for statement-1.
Statement-1 is true and statement-2 is false.
Both the statements are false.
Which of the following statements are correct?
- From the region of elongation, some of the epidermal cells form root hairs.
- Pneumatophores are seen in Rhizophora.
- Adventitious roots are seen in the banyan tree.
- Maize and sugarcane have prop roots.
(i) and (iv)
(i), (iii) and (iv)
(iii) and (iv)
(ii) and (iii)