Alternation of Generation

Q. Life cycle of Ectocarpus and Fucus respectively are:

1. Haplontic, Diplontic
2. Diplontic, Haplodiplontic
3. Haplodiplontic, Diplontic
4. Haplodiplontic, Haplontic

Q.

Which one of the following has a haplontic life cycle?

1. Funaria

2. Wheat

3. Ustilago

4. Polytrichum

Q.

What is a gametophyte ?

Q.

Regarding assertion and reason, select the correct option

Assertion [A]: Algae and fungi shift to sexual method of reproduction at the onset of adverse conditions.

Reason [R]: Sexual reproduction results in the formation of zygospore in algae and fungi.

1. Both A and R are true and R explains A

2. Both A and R are true and R does not explain A

3. A is false but R is true

4. Both A and R are false

Q.

_______________ are the male reproductive organs in lower plants .

1. Antheridia

2. Archegonia

3. Gynoecium

4. Androecium

Q.

The life cycle in which haploid gametophyte and diploid sporophyte phases are equally dominant is termed as-

1. Haplontic

2. Haplo-diplontic

3. Diplontic

4. Triplontic

Q.

What is the process that is exhibited by cryptogams as part of their reproductive cycle, that enables them to stabilise the chromosomal number when required ?

1. Respiration

2. Heterospory

3. Alternation of Generations

4. Oogamy

Q. In Pinus plant, the examples of old haploid, new diploid and old diploid are

1. Embryo, perisperm, endosperm
2. Endosperm, embryo, perisperm
3. Testa, perisperm, embryo
4. Endosperm, perisperm, embryo

Q. Diploid sporophyte is the dominant, photosynthetic, independent phase in plants exhibiting

1. haplontic life cycle
2. diplontic life cycle
3. haplo-diplontic life cycle
4. diplo-haplontic life cycle

Q. The wing in Pinus seed originates from

1. Integument
2. Cone
3. Adaxial surface of ovuliferous scale
4. Bract scale

Q.

do coelomates have triploblastic organisation?

Q.

Consider the following four statements:

I. The Sporophyte of liverworts lives longer than those of mosses;

II. Sphagnum is heterosporous;

III. The lifecycle in all seed bearing plants is diplontic;

IV. In pinus, male and female cones are borne on the same plants.

Which of the two statements are wrong?

1. Statements (I) & (III)

2. Statements (I) & (IV)

3. Statements (II) & (III)

4. Statements (I) & (II)

Q. The sporophytic phase in Funaria is well developed and composed of ________________.

1. Capsule only
2. Spore sac
3. Foot, seta and capsule
4. Foot and capsule

Q.

Meiosis results in

1. All of the above

2. Introduction of variation

3. Maintenance in the number of chromosomes

4. Production of gametes