Tag: need of family planning

Questions Related to need of family planning

Abundant occurrence of fossilised pollen grains is due to resistant.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Lignocellulose

  2. Sporopollenin

  3. Pectocellulose

  4. Pectolignin

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Correct Option: B
Explanation:

Abundant occurrence and preservation of the fossil pollen grains result from the extremely resistant nature of the outer wall of the pollen grains. This wall is the exine and composed of a compound commonly known as sporopollenin. It originates from the polymerization of carotenoids and carotenoid esters.

Thus the correct answer is B. 

Which of the following pair has haploid structures?

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Nucellus and antipodal cells

  2. Antipodal cells and egg cell

  3. Antipodal cells and megaspore mother cell

  4. Nucellus and primary endosperm nucleus

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Correct Option: B

Pollen grain represents.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Spore

  2. Zygote

  3. Immature male gametophyte

  4. Male gamete

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Correct Option: C

Point out the odd one.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Nucellus

  2. Embryo sac

  3. Micropyle

  4. Pollen grain

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Correct Option: D

Ovule is tritegmic in.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Juglans

  2. Casuarina

  3. Opuntia

  4. Asphodelus

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Correct Option: D

Exine of pollen grain is formed of.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Callose

  2. Pecto-cellulose

  3. Ligno-cellulose

  4. Sporopollenin

Show answer
Correct Option: D
Explanation:

The pollen is having two layers. The tough outer layer is referred to as the exine. This sophisticated and complex outer layer is having a compound known as sporopollenin. It is waterproof, resistant to the deterioration and very stiff as well. This shell is actually one of nature's most advanced polymers. It ensures that the tender cells must have a strong chance of survival.

Thus the correct answer is option D.

Crassinucellate ovule has.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Ill developed nucellus

  2. Partially developed nucellus

  3. Well developed nucellus

  4. No nucellus

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Correct Option: C

An anther having four microsporocytes shall produce pollen grains.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. $24$

  2. $12$

  3. $8$

  4. $16$

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Correct Option: D

Ovule is curved and the embryo sac is horseshoe shaped. Micropyle, chalaza and funicle occur near one another. The ovule is?

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. Campylotropous

  2. Amphitropous

  3. Orthotropous

  4. Anatropous

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Correct Option: B

Root of flowering plant has $24$ chromosomes. Its gamete would carry chromosomes.

sexual reproduction in flowering plants reproduction - the generating system reproduction sexual reproduction biology reproductive health of humans need of family planning reproductive health problems cell division in embryo development division for growth and reproduction reproductive health

  1. $4$

  2. $8$

  3. $12$

  4. $24$

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Correct Option: C