The method by which embryo sac is formed from archesporium without meiosis is called

Consider the following statements regarding recurrent type apomixis and choose the correct answer:
1. There is meiosis during the formation of megaspore
2. The embryo sac is diploid in nature
3. The embryo sac never develops from a cell of the archesporium
4. The development of embryo from a cell of an embryo sac other than egg is known as apospory

A

Only 1, 2 and 3 are true

B

Only 1 and 4 are true

C

Only 2, 3 and 4 are true

D

Only 2 and 4 are true

Consider the following statements and choose the correct answer:
1. In Oenothera type of monosporic embryo sac, the embryo develops from the micropylar megaspore of the tetrad
2. Antipodal cells are altogether absent in Oenothera type
3. The genus Trapa forms an 8-nucleate embryo sac of the Polygonurn type
4. Oenothera type of embryo sac development has been found to be a characteristic feature of the entire family Onagraceae

A

Only 1, 2 and 3 are true

B

Only 2, 3 and 4 are true

C

Only 1, 2 and 4 are true

D

1, 2, 3 and 4 are true

The type of apomixis, where the embryo sac develops from any cell of the archesporium is known as

A

Haploid apogamy

B

Generative apospory

C

Diploid parthenogenesis

D

Sporophytic budding

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: Somatic embryogenesis in plants is a twostep process comprising of embryo initiation followed by embryo production.
Reason: Embryo initiation is independent of the presence of 2, 4-dichlorophenoxyacetic acid, whereas embryo production requires a high concentration of 2, 4-dichlorophenoxyacetic acid.

A

Both (A) and (R) are true and (R) is the correct reason for (A)

B

Both (A) and (R) are true and (R) is not the correct reason for (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

When the embryo is formed from any cell of the embryo sac other than the egg, the phenomena is called as

A

Parthenogenesis

B

Apospory

C

Apogamy

D

Adventive embryony

Which among the following cells of embryo sac do NOT take part in embryo formation in angiosperms?

A

All of these

B

Egg cell

C

Antipodals

D

Central cell

Consider the following statements.
1. Fertilisation of the egg takes place inside the embryo sac.
2. Fertilised ovum form the embryo.
3. Endosperm is generally triploid.
Which of the statements given above are correct?

A

1, 2 and 3

B

1 and 2

C

2 and 3

D

1 and 3

Consider the following statements regarding poloyembryony and choose the correct answer:
1. False polyembryony includes the development of two or more embryo sacs within the Same nucellus, and the embryos are derived from different embryo sacs
2. In cleavage polyembryony, the zygote instead of giving rise to one embryo produces embryos by cleavage
3. According to Jeffrey (1895), in Erythronium americanum the "embryogenic mass" forms two or three embryos

A

Only 1 and 2 are true

B

Only 2 and 3 are true

C

Only 3 is true

D

1, 2 and 3 are true

Which of the following statements is/are correct? 1. Monosporic development is the method of embryo sac formation from a single megaspore. 2. The egg apparatus consists of two synergids and one egg cell.

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

Consider the following statements about the income calculation methods 1. The method of measuring the aggregate value of spending that the firms receive for the final goods and services which they produce is called the expenditure method. 2. The method of measuring the sum total of all factor payments is called the income method. 3. The method of measuring the aggregate value of final goods and services produced by all the firms is called the product method. Which of the statements given above is/are correct?

A

1 and 3 only

B

2 only

C

1, 2 and 3

D

2 and 3 only

The method by which embryo sac is formed from archesporium without meiosis is called

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