Q. No.Tapetum is:
(1) Group of compactly arranged polyploidy cells in centre of anther
(2) Innermost wall layer which nourishes megaspore mother cells
(3) The cells with more nucleus that do not help in dehiscence
(4) Protecting, multilayered, cells with dense cytoplasm in surrounding of sporogenous mass
(1) Group of compactly arranged polyploidy cells in centre of anther
(2) Innermost wall layer which nourishes megaspore mother cells
(3) The cells with more nucleus that do not help in dehiscence
(4) Protecting, multilayered, cells with dense cytoplasm in surrounding of sporogenous mass
Which of the following points is incorrect about sporopollenin?
(1) It is one of the most resistant organic material known
(2) It can withstand high temperature and strong acids and alkali
(3) 2 enzymes that degrade sporopollenin are known so far
(4) Pollen grains are well preserved as fossils because of presence of sporopollenin
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:
(1) A longitudinal groove running lengthwise
(2) A longitudinal groove running breadth wise
(3) A transverse groove running breadth wise
(4) A transverse groove running lengthwise
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
(1) Sporogenous tissue
(2) Potential pollen mother cell
(3) Both 1 and 2
(4) Conjunctive tissue
Which of the following structure is not associated with protection and dehiscence of anther?
- Tapetum 2. Epidermis
- Endothecium 4. Middle layer
Which of the following statement is not correct for pollen grain?
(1) It represents male gametophyte
(2) It is a spherical structure, about 25-50 micron in diameter
(3) Pollen grains are rich in nutrients
(4) In family rosaceae, leguminoseae and solanaceae pollen lose viability in 30 minute
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
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