Which of the following statement is not associated with phenomenon of flowering?

(1) Decision for flowering takes place much before actual flower appears.

(2) During flowering several structural and hormonal changes takes place

(3) During flowering differentiation takes place

(4) Flowering is independent of environmental factors

 

A typical angiosperm anther is bilobed with each lobe having two theca i.e. dithecous. Theca is separated often by:

Following are four statements how many of them are correct?
a. The anther is a tetragonal structure, with four microsporangia at corners, two in each lobe.
b. Microsporangia develops further and becomes pollen sacs.
c. A typical microsporangia is surrounded by four-layered wall, 3-protective and 1 nutritional.
d. The nutritive layer is densely cytoplasmic and with more than one nucleus
Options :
1. 3                        2. 4
3. 2                        4. 1

When anther is young a group of compactly arranged homogenous cells are present in centre it is known as

Which of the following structure is not associated with protection and dehiscence of anther?

1. Tapetum                     2. Epidermis
2. Endothecium               4. Middle layer

Which of the following statement is not correct for pollen grain?

Look at the diagram given below and answer appropriately

(i) Since ___A___ is associated with fruit, it is called as ___(i)___ .
(ii) Since ___B___ is present, fruit cannot be called as ___(ii)___ .

1. A - Pericarp, (i) - True fruits
2. B - Seed, (ii) - Ex-albuminous
3. A - Thalamus, (i) - True fruit
4. B - Seed, (ii) - Parthenocarpic

 A typical anther shows

a. Two lobes with two theca each
b. Each lobe as dithecous
c. All cells in a given microsporangium as potential PMC
d. Thousands of microspores per microsporangium

Out of these statements :

1. b is incorrect
2. a and b are correct
3. c and d are incorrect
4. a, b, c and d are correct

Find correct match

Arrange the following stages of microspore development into pollen grain, in correct sequence

1. b, c, d, and a 

2. b, d, a and c

3. a, c, b and d 

4. b, a, d and c