Tag: botany

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Questions Related to botany

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Intine layer of pollen grain is made up of

  1. Inner cellulose, outer pectin

  2. Outer cellulose, inner pectin

  3. Only with cellulose

  4. Only with pectin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Pollen grains are a mass of microspores in a seeded plant which appears in the form of fine dust. 
  • Each pollen grain is a minute body with varying shape and structure which are formed in the anthers of angiosperms.
  • It consists of two layers:-
1) Intine or inside layer is a thin and continuous layer made of cellulose or hemicellulose and pectin.
2) Exine or outer layer a highly decay-resistant chemical called sporopollenin.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

The pollen grain is related to the embryosac as

  1. Male gametophyte is to the egg

  2. Male gametophyte is to the female gametophyte

  3. Sperm is to the egg

  4. Sperm is to the female gametophyte
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  1. The pollen grain is the male gametophyte that produces two mature male gametes vegetative and generative cell.
  2. Embryo sac is the female gametophyte that contains a thin sac within the nucellus that contains egg which is female gamete.
As male and female gamete fuse to form the egg, in same way pollen grain and embryosac related with each other to hold them.
So the correct option is 'Male gametophyte is to the female gametophyte'.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Exine of pollen grains is composed of 

  1. Pectocellulose

  2. Lignocellulose

  3. Sporopollenin

  4. Pollen kit
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Most of the pollen grains consists of three distinct parts. The central cytoplasmic part is the source of nuclei responsible for fertilization. The other parts constituting the wall of the grains are an inner layer, the intine, and an outer layer, the exine. the outer and the most durable layer, the exine, is very resistant to disintegration. The constituents of the exine have been termed as the sporopollenin.

So, the correct option is 'Sporopollenin'. 

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

The study of mature outer morphology of pollen grains is known as

  1. Polynology

  2. Palynology

  3. Andrology

  4. Microsporology
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The study of the mature outer morphology of pollen grains and other spores is known as palynology mainly includes pollen that is found in archaeological and geological deposits. These are used for radiocarbon dating and helps to study the ancient climate and environment by knowing the type of plant that grows at that time.

So, the correct option is 'Palynology'

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Chemically pollen kitt is made up of lipids and carotenoids.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pollen kitt is a sticky covering found on the surface of pollen grains. It is common in plants that are pollinated by insects. It is composed of lipids and carotenoids and is formed by tapetum. Pollen kitt helps in pollination. Hence, chemically pollen kitt is made up of lipids and carotenoids.

So, the correct answer is 'Lipids and carotenoids'.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

Which of the following event mainly affected in the absence of generative cell within pollen-grain?

  1. Entry of pollen-tube inside the embryo sac

  2. Double fertilization

  3. Growth of pollen-tube inside the style

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The generative cell in a pollen grain divides to form two male gametes, which are essential for double fertilization (one fertilizes the egg cell, the other fuses with the central cell). Without the generative cell, double fertilization cannot occur.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

The carrier of male gametes in seed plants is

  1. Water

  2. Air

  3. Pollen grains

  4. Insects
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Seed plants are referred to angiosperms, in which seeds are present and are covered. They have male and female gametes that are responsible for fertilization. The male gametes are produced in larger numbers than the female gametes. These male gametes are the carrier of pollen grains while female gametes are the carrier of eggs or ovules. In pollination, the pollen grains are carried through wind, water or insects to the stigma of another flower.

So, the correct option is 'Water, Air, Insects, and Pollen grains'.

Multiple choice botany male & female gametophytes: structure and development pollen grain androecium male gametophyte

The male gametes of angiosperms are

  1. Uniflagellate

  2. Biflagellate

  3. Non-motile as there is no flagellated stage in the life cycle of angiosperms

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The male gametes of angiosperms consist of two sperm cells within a pollen grain or a pollen tube. They are derived from a single generative cell, which is formed as the smaller cell by unequal cell division in the microspore after meiosis. The gametes formed will be non-motile as there is no flagellated stage in the life cycle of angiosperms.