BiologyQ51–55 of 59 questions
Page 2 of 2 · English
51
BiologyEasyMCQGSEB · 2020
The early embryo (up to $8$ blastomeres) that is transferred to the fallopian tube is called . . . . . . .
A
$ZIFT$
B
$IUT$
C
$IUI$
D
$ICSI$
Solution
(A) The transfer of an early embryo with up to $8$ blastomeres into the fallopian tube is known as Zygote Intrafallopian Transfer $(ZIFT)$.
$IUT$ (Intrauterine Transfer) involves transferring embryos with more than $8$ blastomeres into the uterus.
$IUI$ (Intrauterine Insemination) involves placing sperm directly into the uterus.
$ICSI$ (Intracytoplasmic Sperm Injection) is a laboratory procedure where a single sperm is injected directly into an egg.
$IUT$ (Intrauterine Transfer) involves transferring embryos with more than $8$ blastomeres into the uterus.
$IUI$ (Intrauterine Insemination) involves placing sperm directly into the uterus.
$ICSI$ (Intracytoplasmic Sperm Injection) is a laboratory procedure where a single sperm is injected directly into an egg.
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52
BiologyEasyMCQGSEB · 2020
Assertion $A$: Pollen grains are found in the form of fossils.
Reason $R$: Sporopollenin is seen in its outer layer.
Reason $R$: Sporopollenin is seen in its outer layer.
A
Assertion $A$ and Reason $R$ both are correct,Reason $R$ is the correct explanation for Assertion $A$.
B
Assertion $A$ and Reason $R$ both are correct,Reason $R$ is not the correct explanation for Assertion $A$.
C
Assertion $A$ is correct and Reason $R$ is false.
D
Assertion $A$ is false and Reason $R$ is correct.
Solution
(A) The outer layer of the pollen grain,known as the exine,is made up of a highly resistant organic material called sporopollenin.
Sporopollenin is one of the most resistant organic materials known; it can withstand high temperatures,strong acids,and alkali conditions.
No enzyme that degrades sporopollenin is known.
Due to the presence of this substance,pollen grains are well-preserved as fossils.
Therefore,both Assertion $A$ and Reason $R$ are correct,and Reason $R$ is the correct explanation for Assertion $A$.
Sporopollenin is one of the most resistant organic materials known; it can withstand high temperatures,strong acids,and alkali conditions.
No enzyme that degrades sporopollenin is known.
Due to the presence of this substance,pollen grains are well-preserved as fossils.
Therefore,both Assertion $A$ and Reason $R$ are correct,and Reason $R$ is the correct explanation for Assertion $A$.
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53
BiologyEasyMCQGSEB · 2020
Which of the following statements are true?
$P = \text{Papaver}$ has a multicarpellary syncarpous pistil.
$Q = \text{Endothecium}$ provides nourishment to the Microspore Mother Cell.
$R = \text{Commelina}$ has chasmogamous and cleistogamous flowers.
$P = \text{Papaver}$ has a multicarpellary syncarpous pistil.
$Q = \text{Endothecium}$ provides nourishment to the Microspore Mother Cell.
$R = \text{Commelina}$ has chasmogamous and cleistogamous flowers.
A
Statement $P$ and $Q$ both are true.
B
Statement $P$ and $Q$ both are false.
C
Statement $P$ is false and $R$ is true.
D
Statement $P$ and $R$ both are true.
Solution
(D) Statement $P$ is true: $\text{Papaver}$ (poppy) possesses a multicarpellary syncarpous ovary.
Statement $Q$ is false: The $\text{tapetum}$ provides nourishment to the developing pollen grains,not the $\text{endothecium}$. The $\text{endothecium}$ helps in the dehiscence of anthers.
Statement $R$ is true: $\text{Commelina}$ produces both chasmogamous (open) and cleistogamous (closed) flowers.
Therefore,statements $P$ and $R$ are true.
Statement $Q$ is false: The $\text{tapetum}$ provides nourishment to the developing pollen grains,not the $\text{endothecium}$. The $\text{endothecium}$ helps in the dehiscence of anthers.
Statement $R$ is true: $\text{Commelina}$ produces both chasmogamous (open) and cleistogamous (closed) flowers.
Therefore,statements $P$ and $R$ are true.
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54
BiologyEasyMCQGSEB · 2020
$A$ typical angiosperm embryo sac,at maturity,though $8$-nucleate is . . . . . . .
A
$7$-nucleate - $8$-celled
B
$8$-nucleate - $7$-celled
C
$6$-nucleate - $7$-celled
D
$7$-nucleate - $6$-celled
Solution
(B) In a typical angiosperm,the embryo sac (female gametophyte) undergoes three successive mitotic divisions after the formation of the functional megaspore.
These divisions result in $8$ nuclei.
After the divisions,cell walls are laid down,leading to the organization of the typical female gametophyte.
It consists of $3$ antipodal cells,$2$ synergids,$1$ egg cell,and $1$ large central cell containing $2$ polar nuclei.
Thus,it is $8$-nucleate but $7$-celled because the two polar nuclei are enclosed within a single central cell.
These divisions result in $8$ nuclei.
After the divisions,cell walls are laid down,leading to the organization of the typical female gametophyte.
It consists of $3$ antipodal cells,$2$ synergids,$1$ egg cell,and $1$ large central cell containing $2$ polar nuclei.
Thus,it is $8$-nucleate but $7$-celled because the two polar nuclei are enclosed within a single central cell.
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55
BiologyEasyMCQGSEB · 2020
Pollen grains are well preserved as fossils because of the presence of . . . . . . .
A
Pectin
B
Cellulose
C
Lignin
D
Sporopollenin
Solution
(D) The exine of pollen grains is made up of a highly resistant organic material called $Sporopollenin$.
$Sporopollenin$ is one of the most resistant organic materials known.
It can withstand high temperatures,strong acids,and alkali conditions.
No enzyme that degrades $Sporopollenin$ is known to date.
Due to this characteristic,pollen grains are well preserved as fossils.
$Sporopollenin$ is one of the most resistant organic materials known.
It can withstand high temperatures,strong acids,and alkali conditions.
No enzyme that degrades $Sporopollenin$ is known to date.
Due to this characteristic,pollen grains are well preserved as fossils.
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