NEETBotanySexual Reproduction in Flowering Plants
Components of Pollen Grain Features A. Generative Cel 1. Larger and spindle shaped nucleus B. Intine 2. Sporopollenin C. Vegetative Cell 3. Smaller D. Exine 4. Pectocellulose
Options
- AA -3 , B -4 , C -1 , D - 2
- BA - 3, B -1 , C - 4, D - 2
- CA -2 , B -1 , C -3 , D - 4
- DA -1 , B -4 , C - 3, D - 2
Correct answer
A. A -3 , B -4 , C -1 , D - 2
Step-by-step solution
The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. Pollen grains are wellpreserved as fossils because of the presence of sporopollenin. The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin. When the pollen grain is mature it contains two cells, the vegetative cell and generative cell (Figure 2.5b). The vegetative cell is bigger, has abundant food reserve and a large irregul