Pollens

Q.

The generative nucleus in the pollen grain develops into two male gametes.

1. True

2. False

Q.

Pollen grains cause allergy to many people. The allergy-causing substance(allergen) of the pollen grain is present in______

1. Intine

2. Cytoplasm

3. Exine

4. Middle layer

Q. Ovules are covered by protective layers called .

1. integuments
2. hilum
3. chalaza

Q.

What is the function of the tube nucleus in fertilization?

Q.

What is the difference between pollen tube and style?

Q.

The layers of pollen grain responsible for their different sizes and textures are

1. Bacula

2. Foot layer

3. Tectum

4. None of the above.

Q.

What is the function of the pollen tube ? Explain it with the help of a diagram.

Q. Name the two covering of pollen grains

Q.

Exine and intine are the parts of
(a) Embryo sac
(b) Pollen grain
(c) Stigma
(d) Seed

Q.

a boy tried to break few seeds with stone .some seeds broke into two equal halfs and some into irregular shapes write the diffrence between these two types of seeds in a table

Q.

Exine and intine are the parts of __________.

1. Stigma

2. Embryo sac

3. Pollen grain

4. Seed

Q. Cell:nuclei ratio is in the given image of a germinating pollen.

1. 4:2
2. 3:2
3. 2:1

Q.

Nasturtium has nectaries.

1. True
2. False

Q. Select the incorrect statement w.r.t. the hard outer layer of pollen wall.
पराग भित्ति की कठोर बाह्य परत के संदर्भ में गलत कथन का चयन कीजिए।

1. It can withstand high temperatures, strong acids and alkali
   यह उच्च ताप, सुदृढ़ अम्लों एवं क्षारों के सम्मुख टिक सकती है
2. It is made up of sporopollenin which is most resistant organic material known
   यह स्पोरोपोलेनिन से बना होता है जो ज्ञात सबसे प्रतिरोधक कार्बनिक पदार्थ है
3. It has prominent apertures called germ pores where sporopollenin is present
   इसमें जननछिद्र नामक सुस्पष्ट द्वारक होते हैं, जहाँ पर स्पोरोपोलेनिन उपस्थित होता है
4. It exhibits fascinating array of patterns and designs
   यह प्रतिमानों एवं डिजाइनों की एक आकर्षक सारणी प्रदर्शित करती है

Q. The entry of pollen tube into the ovule through micropyle is called

1. porogamy
2. mesogamy
3. chalazogamy
4. All of the above

Q.

What does the given picture show? Name it.
How does it affect human beings?

Q. Syngamy means

1. Fusion of gametes
2. Fusion of cytoplasm
3. Fusion of two similar spores
4. Fusion of two dissimilar spores

Q. Intine is the outer layer of pollen grain.

1. True
2. False

Q. The number of eggs produced daily by mature female Ascaris are

1. 100, 000
2. 10, 000
3. 20, 000
4. 200, 000

Q. Generally, number of integuments in the ovule of Angiosperms and Gymnosperms respectively is ____.

1. One and two
2. Two and one
3. One and one
4. Two and two

Q. Match the items in Column A with those in Column B.
$\begin{array}{cc}& \\ \text{Column A}& \text{Column B}\\ \left(a\right)\text{Generative nucleus}& \left(i\right)\text{Pollen tube}\\ \left(b\right)\text{Germ pore}& \left(ii\right)\text{Endosperm nucleus}\\ \left(c\right)\text{Exine}& \left(iii\right)\text{Testa}\\ \left(d\right)\text{Secondary nucleus}& \left(iv\right)\text{Fertilization}\\ \left(e\right)\text{Integument}& \left(v\right)\text{Male nuclei}\\ \left(f\right)\text{Egg nucleus}& \left(vi\right)\text{Rough}\end{array}$

Q. why development of pollen tube is the main function of vegetative cell and not providing nutrition to the male gametes.
"since vegetative cell also contains food reserve" ?

Q. In xerophytes, photosynthesis occur in ?

1. Root
2. Modified stem
3. Scaly leaves
4. Stomata

Q. Pollen grains can cause allergy in some people.

1. False
2. True

Q. Pollination is the process of transfer of pollens from stamen to the pistil.

1. True
2. False

Q.

Which of the following is correct about pollen grain?

1. They do not contain much nutrition.

2. They can survive for thousands of years.

3. They die during winter season.

4. They are not allergic at all.