Reproduction in Flowering Plants: Pollen Grains and Microsporangium

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What is the main purpose of the generative cell in a mature pollen grain?

Initiation of pollen allergy

Storage of food reserves

Division to produce male gametes (correct)

Protection of the vegetative cell

Which component surrounds the cytoplasm of a pollen grain?

Mitochondria

Nucleus

Plasma membrane (correct)

Cell wall made of cellulose

In how many angiosperms does a microspore mature into a 2-celled stage?

20%

50%

Over 60% (correct)

Less than 10%

What role does the vegetative cell play in a mature pollen grain?

Storage of food reserves Signup and view all the answers

Which condition arises due to severe allergies caused by pollen grains in some people?

Chronic respiratory disorders like asthma Signup and view all the answers

In species where the generative cell divides mitotically, at what stage are the pollen grains shed?

3-celled stage Signup and view all the answers

What are the two layers of the pollen grain wall?

Exine and intine Signup and view all the answers

What is the central tissue in the ovule where the archesporium differentiates?

Nucellus Signup and view all the answers

Which structure in the mature embryo sac contains two synergids and an egg cell?

Egg apparatus Signup and view all the answers

What is the mechanism to transfer pollen grains from the anther to the stigma called?

Pollination Signup and view all the answers

What is the process called when the pollen tube enters the embryo sac and is compatible?

Fertilization Signup and view all the answers

Which male reproductive structure has a generative cell and a vegetative cell?

Pollen grain Signup and view all the answers

Why are pollen grains well-preserved as fossils?

As the exine layer is made of sporopollenin Signup and view all the answers

What is the main function of the exine layer of the pollen grain?

To protect the pollen grain from harsh conditions Signup and view all the answers

Which part of the pollen grain is responsible for its resistance to high temperatures and strong acids?

Sporopollenin in the exine layer Signup and view all the answers

What is the main purpose of the germ pore on a pollen grain?

To facilitate germination of the pollen grain Signup and view all the answers

What accounts for the variety of architecture seen on pollen grains from different species?

Differences in their sizes and shapes Signup and view all the answers

Which layer of the pollen grain is specifically mentioned to be hard and resistant?

Exine layer Signup and view all the answers