STANDARD Botany Sexual Reproduction In Flowering Plants Class 12 Questions
44 questions
These processes are necessary for the complete development of male gametophyte from pollen mother cell
Exine of pollen grains is composed of
How many meiotic divisions are necessary to produce 100 pollen grains
The outermost and innermost wall layers of microsporangium in an anther are respectively
Most resistant biological material is Or An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
Pollen grains are generally spherical measuring about ______ micrometers in diameter
The function of innermost layer of pollen sac, tapetum is
Which of the following wall layers of anther play a predominant role in its dehiscence
Identify A, B, C and D in given figure
What does the filiform apparatus do at the entrance into ovule Or Function of filiform apparatus is to
Pollen-pistil interaction is a dynamic process involving ______ followed by ______.
Water hyacinth and water lily, the flowers emerge above the level of water and are pollinated by ______.
Embryo sac is
Which one of the most common embryo sac in flowering plant
In the diagram given below, parts labelled as 'A', 'B', 'C', 'D', 'E' and 'F' are respectively identified as
The arrangement of the nuclei in a normal embryo sac in the dicot plants is
Match the items in column I with those in column II and choose the correct answer
Some plants such as Viola, Oxalis, and Commelina produce _______ flowers
The point of attachment of funicle with chalazal end is called
Megaspores are produced from the megaspore mother cells after
Which of the following statements is not correct
The flower is the reproductive unit in the __________ meant for __________ reproduction.
An example of axile placentation is
The body of the ovule is fused within the funicle at
While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant
Wind pollinated flowers often have _______ and numerous flowers packed into an inflorescence
Matching column I with column II and choose the correct option.
Double fertilization is a characteristic of
Number of nuclei taking part in double fertilization is
______ male and female flowers are present on different plants, that is known as _______
The cell that divides to form two male nuclei in angiosperms is
Which one of the following events takes place after double fertilization
Double fertilization process means
The genetic nature of apomictic embryo is ________
Match the following and choose correct option
In a monoecious plant
Match the following and choose the correct combination from the options given below
In gymnosperms pollination is exclusively by
In gymnosperms, the ovule is naked because
In gymnosperms, the male cone bears ______, and the female cone bears ______ respectively.
The sequence of development of embryo sac is
Parthenocarpic fruit is a –
Assertion: Chasmogamous flowers require pollinating agents. Reason: Cleistogamous flowers do not expose their sex organs.
Assertion: Autogamy is pollination between two flowers on the same plant. Reason: Xenogamy is pollination between two flowers on different plants.