Male Gametophyte

Q.

Discuss the advantages and disadvantages of hybrid seeds?

Q. The tissue that nourishes the developing pollen grain is:

1. Tapetum
2. Endothecium
3. Middle layer
4. Endothelium

Q. What are the advantages of a seed to the angiosperms?

1. Seed formation is not dependent on water
2. Seeds have food reserves for the nourishment of the embryo
3. Seed coat provides protection to the embryo
4. All of the above.

Q. The inner wall of pollen grain is called _________ and it is made up of _______.

1. exine, cellulose
2. intine, pectin
3. intine, cellulose and pectin
4. exine, sporopollenin

Q. Assertion: Endothecium layer of anther wall plays an important role in dehiscence of anther.

Reason: The presence of fibrous bands and differential expansion of inner and outer tangential walls of endothecial cells cause dehiscence of anther.

1. Both assertion and reason are true and reason is the correct
   explanation of assertion
2. Both assertion and reason are true but reason is not the correct explanation of assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false

Q. Which among the following statements is correct?
(a) The vegetative cell of pollen grain divides to form the male gametes.
(b) Sporopollenin is absent in the germ pores.
(c) Intine of pollen grains is made up of cellulose and pectin.
(d) Pollen grains represent the male gametophyte.

1. a, b, c and d
2. a, b and d
3. b, c and d
4. a, c and d

Q. Choose the correct statement(s) regarding pollen grains.
I. Pollen grains are the male gametes of the flowering plant.
II. Pollen grain has a prominent two-layered wall.
III. The outer thick wall of pollen grain is called exine and the inner thin wall is called intine.
IV. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic materials known.

1. I, II and IV are correct
2. II, III and IV are correct
3. I, II and III are correct
4. All are correct

Q. The endosperm of gymnosperm is

1. Diploid
2. Polyploid
3. Triploid
4. Haploid.

Q. Assertion: Pollen grains are well preserved as fossils.
Reason: The outer layer of pollen grains called the exine is made up of sporopollenin.

1. Both assertion and reason are true but reason is not the correct explanation of assertion.
2. The assertion is true but reason is false.
3. Both assertion and reason are false.
4. Both assertion and reason are true and reason is the correct explanation of assertion.

Q. An angiospermic plant has 24 chromosomes in its mesophyll cells. The number of present in synergid, pollen grain, nuclleus and endosperm will be respectively

1. 8, 8, 12, 36
2. 12, 12, 12, 36
3. 12, 12, 12, 72
4. 12, 12, 24, 36

Q.

The endosperm in angiosperm develops from

1. Zygote

2. Chalazal polar nucleus

3. Secondary nucleus

4. Micropyler polar nucleus

Q.

Parthenium came to India as a seed contaminant along with:

1. Rice

2. Maize

3. None of the above

4. Wheat

Q.

What is an anti-transpirant ? Name some anti-transpirants.

Q.

In gymnosperm the pollen chamber represents?

1. Microsporangium in which pollen grains develop

2. A cavity in the ovule in which pollen grains are stored after pollination

3. A cell in the pollen grain in which the sperms are formed

4. An opening in the megagametophyte through which the pollen tube approaches the egg

Q. Which of the following statements is NOT true?

1. Intine is a thick, non-continuous inner layer of pollen grain.
2. Exine of pollen grains is made up of sporopollenin.
3. Most species of pollen grains can cause allergic reactions
4. Pollen grains can be stored in liquid nitrogen.

Q. Which of the following is the male gametophyte in angiosperms?

1. 
2. 
3. 
4. 

Q. Sperm cells of angiosperms and gymnosperm differ from that of bryophytes and pteridophytes. Choose the statement that gives the incorrect difference.

1. In angiosperms and gymnosperms, various biotic and abiotic pollinators are required for pollination, while bryophyte and pteridophyte require specifically water for transfer of male gamete to female gamete.
2. In angiosperms the sperm cells are produced in the pollen grain whereas in the rest they are produced in the antheridium.
3. In angiosperms and gymnosperms the sperm cells are non-motile whereas in the rest they are flagellated.
4. In angiosperms and gymnosperms, pollen contains sporopollenin, while in bryophytes and pteridophytes, sporopollenin is absent.

Q. Find the odd one out

1. Tapetum-nourishes the pollen grains
2. germ pore-sporopollenin
3. Intine-cellulose and pectin
4. none of the above

Q. In Racemose, flowers are arranged in :

1. Acropetal order
2. Centrifugal order
3. Centripetal order
4. Basipetal order

Q.

Which of the following statements is correct regarding sporopollenin?

1. Sporopollenin is made up of inorganic materials

2. Sporopollenin can be degraded by enzymes

3. Sporopollenin can withstand high temperatures but not strong acids

4. Sporopollenin can withstand high temperatures as well as strong acids and alkalis

Q. Sporopollenin occurs in ________.

1. wall of microsporangium
2. cytoplasm of vegetative cell of pollen grain
3. intine of pollen wall
4. exine of pollen wall

Q.

Spermology is the study of

1. Seed

2. Leaf

3. Fruit

4. Pollen grain

Q. Which among the following is true regarding pollen tablets?

1. They are used as food supplements
2. They increase the performance of athletes and race horses
3. They are used for pollination
4. Both a and b

Q. Which of the following structures facilitates the entry of oxygen and water in the seed?

1. Hilum
2. Filiform apparatus
3. Micropyle
4. None of these

Q. Why enol form is in less percentage during ketoenol tautomerism of acetoacetic ester

Q. The pollen grains of __________ cause pollen allergy.

1. Bryophyllum
2. Parthenium
3. orchids
4. None of these

Q. The endosperm found in angiospermic seed is different from that of gymnosperms in that, the former

1. is formed after fertilization
2. is formed before fertilization while the latter is formed after fertilization
3. is cellular while the latter is nuclear
4. is nutritive while the latter is protective

Q. Spots on exine where sporopollenin is absent is called

1. Germ pore
2. Vegetative pore
3. Sex pore
4. Generative pore

Q. HindIII has a _____base pairs recognition sequence.

1. 4
2. 6
3. 8
4. 10

Q. Which among the following is true regarding pollen tablets?

1. They are used as food supplements.
2. They increase the performance of athletes and race horses.
3. They are used for pollination
4. Both a and b