Tag: basics of leaf and flower

Questions Related to basics of leaf and flower

Arrangement of flowers on the floral axis of plant is called?

botany inflorescence introduction to inflorescence inflorescence and its type basics of leaf and flower

  1. Inflorescence

  2. Phyllotaxy

  3. Placentation

  4. Corymb

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Correct Option: A
Explanation:
A. An inflorescence is the arrangement of flowers on the floral axis of the plant. Two major types of the inflorescence are - 1. Racemose - the shoot axis continues to grow indefinitely and the flowers are borne in acropetal succession. Examples are radish, Lupin, and mustard. 2. Cymose - the main axis terminates into a flower and has a limited growth and the flowers are borne in a basipetal order. Examples are begonia, teak, and Solanum.
B. Phyllotaxy is the pattern in which the leaves are arranged on the stem or its branches. The leaves are arranged in three ways - 1. Alternate - single leaf is present at each node in the alternate fashion. Examples are China rose, mustard, and sunflower. 2. Opposite - a pair of leaves arise at each node on the opposite side, the leaves lie opposite to each other at each node. Examples are guava and calotropis. 3. Whorled - more than two leaves arise at each node and form a whorl or a circle, the leaves of one whorl alternate the leaves of the next successive whorl so that all the leaves receive maximum sunlight. Examples are Alstonia and Nerium.
C. Placentation is the arrangement of ovules on placenta within the ovary. It is of six types- marginal, axile, parietal, free central and basal.
D. A corymb is lower flowers have long pedicels than upper ones so that all the flowers are brought more or less to the same level. The main axis is short. Examples are Iberis and Capsella.

So, the correct answer is 'inflorescence'.

An inflorescence with single, oldest, female flower and many younger male flower has to be

botany reproductive morphology introduction to inflorescence inflorescence and its type basics of leaf and flower

  1. verticillaster

  2. hypanthodium

  3. spike

  4. cyathium.

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Correct Option: D
Explanation:

An inflorescence with single, oldest, female flower and many younger male flowers is cyathium. For example, inflorescence in Euphorbia

So, the correct answer is 'cyathium.'

In an inflorescence where flowers are borne laterally in an acropetal succession, the position of the youngest floral bud shall be

botany reproductive morphology introduction to inflorescence inflorescence and its type basics of leaf and flower

  1. Proximai

  2. Distal

  3. Intercalary

  4. Anywhere

Show answer
Correct Option: B
Explanation:
In race mose inflorescence younger flowers are born at the apex or distal end while older flowers are at the base, this type of succession is acropetal succession. Thus, the position of youngest floral but would be distal. 
Correct option is B.

Which type of fruit is found in rice

botany reproductive morphology introduction to inflorescence inflorescence and its type basics of leaf and flower

  1. Legume

  2. Caryopsis

  3. Drupe

  4. Berry

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Correct Option: B
Explanation:

The type of fruit that is found in rice is Caryopsis. Caryopsis is a type of simple dry fruit—one that is monocarpellate (formed from a single carpel) and indehiscent (not opening at maturity) and resembles an achene, except that in a caryopsis the pericarp is fused with the thin seed coat.

So, the correct answer is 'Caryopsis'

The hypanthodium inflorescence is characterised by?

botany reproductive morphology introduction to inflorescence inflorescence and its type basics of leaf and flower

  1. Presence of bisexual flower

  2. Pressure of unisexual male flowers near base

  3. Presence of trimorphic flowers

  4. Absence of gall flower

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Correct Option: A

Which statement is incorrect for cymose inflorescence?

botany reproductive morphology introduction to inflorescence inflorescence and its type basics of leaf and flower

  1. Basipetal arrangement of flowers

  2. The main axis continues to grow

  3. The main axis terminates in a flower

  4. Definite inflorescence

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Correct Option: A

Butterfly shaped flower with one stranded, two wing-like and two keeled petal belongs to

botany plants: parts and functions taxonomic description of flower technical terms related to flowers basics of leaf and flower

  1. Compositae

  2. Rubiaceae

  3. Malvaceae

  4. Papilionaceae

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Correct Option: D
Explanation:

Dicotyledonous plants characterized by their butterfly-shaped flowers, composed of a top petal, the standard, followed by two opposing petals on the sides, the wings, followed by a bottom petal, the keel, in which the reproductive organs are situated is known as papilionaceae family. This family is also called as legumes.

Diclinous flowers can be traced on

botany plants: parts and functions taxonomic description of flower technical terms related to flowers basics of leaf and flower

  1. Carica

  2. Morus

  3. Trichosanthes

  4. All of the above

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Correct Option: D
Explanation:

Diclinous flowers are flowers which have stamens and pistils on separate flowers, it could be on the same plant or different. The plant could be monoecious or dioecious but the male and female reproductive parts are not present on the same flower. Carica, Morus, and Trichosanthes, all are diclinous. So, the correct answer is option D.

When both sexes are absent from a flower or are non-functional , the flower is said to be

botany plants: parts and functions taxonomic description of flower technical terms related to flowers basics of leaf and flower

  1. Incomplete

  2. Intersexual

  3. Neuter

  4. Unisexual

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Correct Option: C
Explanation:

When both sexes are absent from a flower or are non-functional , the flower is said to be  neuter. Neuter flowers have undeveloped or nonfunctional sexual organs. They have pistils and stamens that are nonfunctional or absent. The flowers are androgynous and the plants reproduce  asexually. Ray florets of sunflower are neuter flowers, disc florets are bisexual, also in some more Asteraceae, e.g. Centaurea.

Centripetally arranged sessile flowers on a flattened convex axis are found in

botany plants: parts and functions taxonomic description of flower technical terms related to flowers basics of leaf and flower

  1. Hibiscus

  2. Helianthus

  3. Holoptelea

  4. All of the above

Show answer
Correct Option: B
Explanation:

Centripetally arranged sessile flowers on a flattened convex axis are found in Helianthus. The genus is one of many in the Asteraceae that are known as sunflowers. It is distinguished technically by the fact that the ray  flowers, when present, are sterile, and by the presence on the disk flowers of a pappus that is of two awn-like scales that are cauducous. They bear one or several to many wide, terminal capitula (flower heads), with bright yellow ray florets at the outside and yellow or maroon disc florets inside. Several ornamental cultivars have red-colored ray florets. 

Therefore, the correct answer is option B.