NEET - Multiple Choice question: Structure of Pollen grain, Pollen Allergy and Microsporogenesis
1.Which of the following statement is not correct.
A. The cell of sporogenous tissue is differentiated and act as micro spore mother cell .
B. Only one cell of sporogenous tissue is capable to act as microspore mother cell.
C. Microspore are formed from microspore mother cell in form of microspore tetrad.
D. Microspore represent the male gametophyte. Answer : B Explanation
2.Microsporogenesis refer to the formation of microspore from the microspore mother cell by the division of :
A. Meiosis
B. Mitosis
C. Amitosis.
D. Equational divison
Answer: A Explanation
3. To release Pollen grain, anther is dehiscesed or ruptured by the
A. Dehydration
B. Carboxylaion
C. Decarboxylation
D. None of the above.
Answer : A Explanation
4. Which of the following statement is correct.
A. Pollen grain is spherical with 25 to 50 micrometer in diameter.
B. Pollen grains are released from anther always at 3 celled stage.
C. The cytoplasm of pollen grain is not covered by the plasma membrane.
D. Pollen grain are released very few in number for better chance of fertilization.
Answer : A Explanation
5. How many statements are correct.
1. Cytoplasm of pollen grain is covered by plasma membrane.
2. Pollen grain in covered by tough and hard inline and cellulosic oxide.
3. Exine completely covers the pollen grain without leaving any opening.
4. Germ pore is present on intine for the germination of pollen tube.
A. One B. Two
C. Three D. Four
Answer: B Explanation
6. Which of the following is not a significance of sporopollenin.
A. No enzyme or chemical can degrade the sporopollenin.
B. Pollen grains make resistance against abiotic stress like temperature, humidity due to sporopollenin.
C. Pollen grain can be preserved at low temprature in pollen bank due to sporopollenin.
D. Pollen grains are preserved as fossils due to the presence of sporopollenin.
Answer : C Explanation
7. Intine of pollengrain is made up of
A. Cellulose and lignin
B. Cellulose and pectin
C. Lignin and pectin
D.Cellulose, lignin and pectin
Answer: B Explanation
8. Consider the following statement and select the correct code:
1. Intine is protruded through germ pore and form pollen tube.
2. Exine is made up of sporopollenin.
3. Pollen grain of all plant species are spherical in shape.
A. 1 and 2 B. 2 and 3
C. 1 and 4 D. 1, 2 and 3
Answer: A Explanation
9. Pollen is released at 2 celled stage at what percent of flowering plants.
A. 60 % B. 40%
C. 50% D. 30 %
Answer : A Explanation
10. Which of the following structure is not common in 2 celled stage pollen grain and 3 celled stage pollen grain when it release from anther.
A. Intine B . Germ pore
C. Generative cell.
D. Vegetative cell .
Answer : C Explanation
11. Consider the following statement and select the correct code;
1. In 60 percentage of Angiosperms, pollen are released from Anther at 2 celled stage.
2. In remaining species of angiosperms, generative cell divide and form two male gamete and pollen grain is at 3 celled stage.
A. Only 1 B. Only 2
C. Both 1 and 2
D. Neither 1 nor 2
Answer : C Explanation
12. Which of the following statement is correct.
A. Vegetative cell divides and give rise to two male gamete when released from anther.
B. The vegetative cell has large , irregular shape nucleus.
C. The vegetative cell float in cytoplasm of generative cells.
D. The vegetative cell is small and spindle shaped with dense ctyoplasm.
Answer : B Explanation
13. Which of the following is not a feature of vegetative cell of pollen grain.
A. Spindle shape
B. Irregular nucleus
C. Reserve food
D. Large and big in size.
Answer : A Explanation
14. Which of the following statement is / are correct.
A. Pollen grain may cause some respiratory affliction like Asthma , Bronchitis.
B. Parthenium or carrot grass was imported along with wheat in India and it causes pollen allergy.
C. In Western countries a pollen grains are used as pollen tablet or pollen syrups.
D. All of the above
Answer: D Explanation
16. How many statements are correct.
1. The generative cell float in cytoplasm of vegetative cells.
2. Race horses and athletes may also consume the pollens to increase the performance.
3. vegetative and generative cells of pollen grain are diploid.
4. Microspore mother cells divided by mitosis and form thousand of pollen grain.
A. One B. Two
C. Three D. Four
Answer: B Explanation
17. In which of the following plants, pollen grain maintain its viability up to 30 minutes.
A. Rice and Maize
B. Rice and Wheat
C. Maize and Wheat
D. Rice, Maize and Wheat
Answer: B
18. Some members of which family maintain pollen viability for saveral months.
A. Leguminoseae and Solanaceae
B. Solanaceae and Rosacease
C. Leguminoseae and Rosaceae
D. Leguminoseae Solanaceae and Rosacease
Answer: D
19. For crop improvement programme, Pollen grain of saveral species can be preserved at what temperature in pollen bank similar to seed bank.
A. - 196C B. - 296C
C. 273 C D. 253 C
Answer : A
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