Development of Embryo

Q.

Arrange the stages of embryo development in dicots from earliest to latest.

1. Heart-shaped
2. Mature
3. Pro-embryo
4. Globular

Q.

Why do you think the zygote is dormant for sometime in a fertilised ovule?

Q.

Why do you think the zygote is dormant for sometime in a fertilized ovule?

Q. Cleavage polyembryony is generally found in

1. monocots
2. dicots
3. angiosperms
4. gymnosperms

Q. Endosperm development precedes embryo development because_____________.

1. cells of PEN divide faster than cells of zygote.
2. the endosperm is triploid and zygote is diploid.
3. the developing embryo needs nutrition.
4. all of the above

Q. Apomictic embryos in some species of asteraceae and grasses arise from:

1. Synergids
2. Maternal sporophytic tissue in ovule
3. Haploid egg cell
4. Antipodal cells

Q. Read the following statements related to embryogeny in plants and select the incorrect statements.

I. The early stages of embryo development are different in monocotyledons and dicotyledons.
II. Most zygotes divide only after a certain amount of endosperm is formed to ensure nutrition to the developing embryo.
III. Endosperm is completely consumed by developing embryos before seed maturation in coconut.
IV. The zygote gives rise to the proembryo and subsequently to the globular, heart-shaped and mature embryo.
[1 mark]

1. I, II and III
2. I and III
3. II, III, and IV
4. III and IV

Q. Identify the given figure and the labelled part and choose the option accordingly.
[0.7 mark]
​​​​​​​

1. Endosperm of monocot seed; P-Suspensor
2. Heart-shaped monocot embryo; R-Radicle
3. Dicot globular embryo; R-Radicle
4. Mature dicot embryo; Q-Plumule

Q. Assertion : The embryo which is capable to germinate should have well-developed radicle plumule and one or two cotyledons.
Reason : In the Orobanchaceae and Orchidaceae the embryo never differentiates a true radicle, plumule and cotyledons, but can germinate.

1. Both assertion and reason are true and reason is a correct explanation of the assertion.
2. Both assertion and reason are true but reason is not a correct explanation of the assertion.
3. Assertion is true but Reason is false
4. Both Assertion and Reason are false
5. Assertion is false but Reason is true

Q. Which of the given statements are true?
(i) During the development of a dicot embryo, heart-shaped embryo is followed by globular embryo.
(ii) The part of embryonal axis above the level of cotyledons is epicotyl, while the part below the level of cotyledons is hypocotyl.
(iii) Monocot seeds possess a single cotyledon represented by scutellum.

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (i), (ii) and (iii)

Q. The chief edible part in (a) groundnut (b) jack fruit (c) apple and (d) mango fruits are

1. (a) Endosperm, (b) Inflorescence axis, (c) Mesocarp, (d) Endocarp
2. (a) Cotyledons, (b) Endosperm, (c) Mesocarp, (d) Fleshy thalamus
3. (a) Cotyledons, (b) Succulent perianth, (c) Fleshy thalamus, (d) Mesocarp
4. (a) Cotyledons, (b) Fleshy thalamus, (c) Pericarp, (d) Mesocarp

Q. Placenta and pericarp an both edible in

1. Banana
2. Tomato
3. Potato
4. Apple

Q. The edible part of Apple/Pear is

1. Cotyledons
2. Thalamus/Receptacle
3. Mesocarp
4. Endocarp.

Q. Best example to depict polyembryony is

1. Taenia
2. Fasciola
3. Schistosoma
4. All of the above

Q. Give the names of structured which has diploid ploidy in embryo sac after fertilisation

Q. Edible part in the fruit of litchi is

1. Mesocarp
2. Aril
3. Fleshy thalamus
4. Cotyledons

Q.

True or false?
The development of monocot and dicot embryo is similar until the globular stage.

1. True

2. False

Q. The process of development of embryo sac from unreduced megaspore mother cell is called as ...............

1. Apospory
2. Diplospory
3. Haploid parthenogenesis
4. Diploid parthenogenesis

Q. Indicate the edible part in

Q. In sorosis type of composite fruits, the edible part is

1. Perianth and peduncle
2. Fleshy thalamus
3. Endosperm
4. Cotyledons

Q.

Dicots and monocots show similarity in embryogeny upto

1. Mature embryo stage

2. Heart-shaped embryo stage

3. Globular embryo stage

4. Cordate embryo stage

Q. The development of embryo sac from megaspore mother cell is called as

1. Apospory
2. Apogamy
3. None of the above
4. Diplospory

Q.

Dicots and monocots show similarity in embryogeny upto

1. Mature embryo stage

2. Heart-shaped embryo stage

3. Globular embryo stage

4. Cordate embryo stage

Q. Which statements are correct?
(a) A fruit developing from inflorescence is composite fruit.
(b) Mesocarp is edible in Apple.
(c) Gynobasic style occurs in Ocimum.
(d) Hypanthodium occurs in Euphorbia species.

1. a, c correct
2. a, b correct
3. a, d correct
4. b, d correct
5. b, c, d correct.

Q. The concept totipotency means that

1. Every living plant cell should be able to regenerate a whole plant
2. Plants can communicate among one another
3. Every plant feels pain
4. Any plant is potent enough to grow In the vicinity of other plants

Q.

True or false?
The development of monocot and dicot embryo is similar until the globular stage.

1. True

2. False

Q.

Why the zygote is dormant for sometime in a fertilised ovule?

Q. After double fertilization, embryo sac/ ovule comes to have.

1. $1$ diploid and $1$ haploid cell
2. $2$ haploid and $1$ triploid cell
3. $1$ diploid and $1$ triploid cell
4. $1$ haploid and $1$ triploid cell

Q. Apomictic embryos in some species of asteraceae and grasses arise from:

1. Haploid egg cell
2. Synergids
3. Antipodal cells
4. Maternal sporophytic tissue in ovule

Q. Development of sporophyte/embryo from gametophytic tissue without fusion of gametes is?

1. Apospory
2. Apogamy
3. Apomixis
4. Parthenogenesis