Ovule generally differentiate a single _____ in the ______ region of the nucellus.

(1) Megaspore mother cell, micropylar

(2) Megaspore, micropylar

(3) Megaspore, mother cell, chalazal

(4) Primary

 

How many statement(s) is/are correct for pollen grains?
a. Parthenium is a cause of bronhial afflictions
b. Intine exhibits fascinating array of patterns and designs
c. Cytoplasm of pollen grain is surrounded by spermoderm
d. Generative cell is present when pollens are shed in 40 percent plants.
1. One                             2. Two
3. Three                          4. Four

Fossilization of pollen grains is helped by

The largest cell of embryo sac is

Read the statements carefully and select correct option.
A. Pollen grains of carrot grass cause bronchial afflictions
B. Pollen viability is maximum in wheat
C. Pollen grains are well preserved as, fossils due to pecto-cellulose
D. Pollen grain aperture is devoid of sporopollenin.
1. A and D                   2. A and B
3. B and C                   4. A, B and D

Which of the following statements for generative cell is incorrect?

Pollen grains are released from anther in 60% of angiosperms
A. With male gametes
B. After first mitosis
C. At two-celled stage
D. After second mitosis

Mark the correct option
1. B and C                           2. A and D
3. A and B                           4. A and C

How many of the given options are correct?
Column I                                       Column II
a. Pollen kitt                                  Sticky pollen
b. Callase enzyme                          Secreted by endothecium
c. Polyploid layer of anther wall       Tapetum 
d. Pollen allergy                              Parthenium

1. Two                             2. Three
3. Four                             4. One

Gynoecium of Michelia and Papaver is similar in being

Flowers of which of the following plants should be pollinated within half an hour for successful seed formation after anther dehiscence?