A mature pollen grain of Pinus has
2 cells
3 cells
4 cells
5 cells
C.
4 cells
In Pinus, the microspore nucleus divides by a periclinal wall and forms a very small prothallial cell and large central cell. The central cell cuts off a second prothallial cell and antheridial cell. The nucleus of the antheridial cell divides to form generative cell and tube cell. Thus, the pollen grain of Pinus is shed at four cell stage when it consists of two vegetative prothallial cells, a generative cell and a tube cell.
Darwin’s finches are an excellent example of
Adaptive Radiation
Seasonal migration
Brood parasitism
Connecting links
Which of the following cross will produce terminal flower in garden pea?
AA x Aa
AA x aa
Aa x Aa
Aa x AA
F1-generation means
First filial generation
First seed generation
First flowering generation
First fertile generation
The year 1900 AD is highly significant for geneticists due to
Discovery of genes
Principle of linkage
Chromosome theory of heredity
Rediscovery of Mendelism
Study the following statements and select the correct option.
I. Tapetum nourishes the developing pollen grains.
II. Hilum represents the junction between ovule and funicle.
III. In aquatic plants such as water hyacinth and water lily, pollination is by water.
IV. The primary endosperm nucleus is triploid.
I, II, and IV are correct, but III is incorrect
I and II are correct, but III and IV are incorrect
I and IV are correct, but II and III are incorrect
I, Ill and IV are correct, but I is incorrect
Morphine, which is used as an analgesic is obtained from
Taxusbrevifolia
Berberisnilghiriensis
Cinchona officinalis
Pa paver somniferum
Which one of the following pairs of plants are not seed producers?
Funaria and Ficus
Fern and Funaria
Funada and Pinus
Ficus and Chlamydomonas
