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501 questions in this collection · Page 13 of 51
Question 121 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The condition where anthers and stigma are placed at different positions to prevent autogamy is called:
In some other species, the anther and stigma are placed at different positions so that the pollen cannot come in contact with the stigma of the same flower.
Question 122 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The pollen tube enters the ovule through the:
Pollen tube, after reaching the ovary, enters the ovule through the micropyle.
Question 123 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which structure guides the entry of the pollen tube into the synergid?
Many recent studies have shown that filiform apparatus present at the micropylar part of the synergids guides the entry of pollen tube.
Question 124 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The process of removal of anthers from a bisexual flower bud is called:
Removal of anthers from the flower bud before the anther dehisces... is referred to as emasculation.
Question 125 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Bagging is done to:
Emasculated flowers have to be covered... to prevent contamination of its stigma with unwanted pollen. This process is called bagging.
Question 126 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Syngamy results in the formation of:
One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. This results in the formation of a diploid cell, the zygote.
Question 127 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The primary endosperm nucleus (PEN) is formed by the fusion of:
The other male gamete moves towards the two polar nuclei... and fuses with them to produce a triploid primary endosperm nucleus (PEN).
Question 128 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following seeds retains the endosperm (albuminous)?
Albuminous seeds retain a part of endosperm... e.g., wheat, maize, barley, castor.
Question 129 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The root tip of a dicot embryo is covered with:
The root tip is covered with a root cap.
Question 130 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In grasses, the scutellum is situated:
In the grass family the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis.