Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Which structures form gynoecium? How is placenta related to gynoecium? What are its types?
Gynoecium is the female reproductive whorl of the flower. It is composed of one or more carpels. Each carpel is differentiated into three parts, i.e., the ovary, style and stigma. Placenta is the tissue on which ovule(s) develops in the ovary. The placentation in the ovary may be (i) marginal (ii) aRead more
Gynoecium is the female reproductive whorl of the
See lessflower. It is composed of one or more carpels. Each carpel
is differentiated into three parts, i.e., the ovary, style and
stigma.
Placenta is the tissue on which ovule(s) develops in the
ovary. The placentation in the ovary may be
(i) marginal (ii) axile
(iii) parietal
(iv) basal (v) free-central
A typical angiospermic flower consists of four floral parts. Give the names of the floral parts and their arrangement sequentially.
(i) Sepals It is the green leaf-like outermost whorl (calyx). (ii) Petals It is the second whorl (corolla) from below often brightly coloured floral parts. (iii) Stamens Third whorl (androecium) of knobbed thread-like male reproductive floral parts. (iv) Carpels Central single whorl (gynoecium) of fRead more
(i) Sepals It is the green leaf-like outermost whorl (calyx).
See less(ii) Petals It is the second whorl (corolla) from below
often brightly coloured floral parts.
(iii) Stamens Third whorl (androecium) of knobbed
thread-like male reproductive floral parts.
(iv) Carpels Central single whorl (gynoecium) of female
reproductive floral parts.
Sunflower is not a flower. Explain.
Sunflower is an inflorescence called capitulum or racemose head. It has a flat disc-shaped peduncle called receptacle. It bears an involucre of bracts on the periphery and two types of small sessile flowers called florets. The flower is arranged centripetally with youngest towards the periphery. TheRead more
Sunflower is an inflorescence called capitulum or
See lessracemose head. It has a flat disc-shaped peduncle called
receptacle. It bears an involucre of bracts on the
periphery and two types of small sessile flowers called
florets. The flower is arranged centripetally with
youngest towards the periphery. There are ray florets
which are sterile female flowers of ligulate type on the
outside. The rest of the flower structure contains disc
florets which are fertile bisexual flowers of tubular type.
Define the term inflorescence. Explain the basis for the different types of inflorescence in flowering plants.
Inflorescence is the arrangement and distribution flowers on the floral axis. Basis for the different types of inflorescence in flowering plants is given below Growth Indefinite (racemose) and definite Number of branches Cymose, uniparous, biparous, multiparous Pedicel Presence or absence of pedicelRead more
Inflorescence is the arrangement and distribution
See lessflowers on the floral axis.
Basis for the different types of inflorescence in flowering
plants is given below
Growth Indefinite (racemose) and definite
Number of branches Cymose, uniparous, biparous,
multiparous
Pedicel Presence or absence of pedicel in inflorescence.
Branching of peduncle Unbranched and branched.
Sex of flowers Certain types have unisexual flowers,
e.g., Catkin.
Tendrils are found in the following plants. Identify whether they are stem tendrils or leaf tendrils. (i) Cucumber (ii) Pea (iii) Pumpkin (iv) Grapevine
(i) Cucumber — Stem tendril (ii) Pea — Leaf or leaflet tendril (iii) Pumpkin — Stem tendril (iv) Grapevine — Stem tendrils
(i) Cucumber — Stem tendril
See less(ii) Pea — Leaf or leaflet tendril
(iii) Pumpkin — Stem tendril
(iv) Grapevine — Stem tendrils
Justify the following statements on the basis of external features. (i) Underground parts of a plant are not always roots. (ii) Flower is a modified shoot.
(i) Underground parts of a plant are not always roots Sometimes stem or stem branches occur underground to perform some special functions. For example, potato tuber is a modified stem which is underground A potato tuber shows nodes and internodes, scale leave and buds at the nodes. It also has an apRead more
(i) Underground parts of a plant are not always roots
See lessSometimes stem or stem branches occur underground
to perform some special functions. For example, potato
tuber is a modified stem which is underground A
potato tuber shows nodes and internodes, scale leave
and buds at the nodes. It also has an apical bud at the
tip of potato tuber which confirms it as a stem.
(ii) Flower is a modified shoot consisting of a highly
reduced stem branch to form thalamus in which the
nodes are borne only towards the tip. The floral parts
i.e., sepals, petals, stamens and carpels are arranged
in their respective whorls and arise from nodes
The growing point of floral bud is used up in the
production of floral organs.
Name the type of stem tendrils found in these plants.
(i) Passiflora — Axillary (ii) Luffa — Extra-axillary (iii) Vitis — Apical (iv) Antigonon — Floral
(i) Passiflora — Axillary
See less(ii) Luffa — Extra-axillary
(iii) Vitis — Apical
(iv) Antigonon — Floral
What is root cap? Which any two variations are found in this?
The apex of each root is covered by a cushion of thin-walled cells known as root cap. Variations (i) Multiple root cap is present in Pandanus (screw pine) (ii) In aquatic plants, the root apex is enclosed within a sac-like structure called root packet, e.g., Pistia, Eichhornia, etc.
The apex of each root is covered by a cushion of
See lessthin-walled cells known as root cap.
Variations
(i) Multiple root cap is present in Pandanus (screw pine)
(ii) In aquatic plants, the root apex is enclosed within a
sac-like structure called root packet, e.g., Pistia,
Eichhornia, etc.
Mango and coconut are drupe type of fruits. In mango, fleshy mesocarp is edible. What is the edible part of coconut? What does milk of tender coconut represent?
Edible part—Endosperm of seed. Milk of tender coconut—Liquid part of endosperm.
Edible part—Endosperm of seed.
See lessMilk of tender coconut—Liquid part of endosperm.
Which kind of inflorescence is shown in following diagram? Describe its feature.
This is compound corymb. Its axis is branched and each branch bears a corymb-like inflorescence, e.g., cauliflower (Brassica oleracea), Pyrus terminalis, etc.
This is compound corymb. Its axis is branched and each
See lessbranch bears a corymb-like inflorescence, e.g., cauliflower
(Brassica oleracea), Pyrus terminalis, etc.