Alternation of Generation

Q.

Zygotic meiosis is characteristic of

1. Marchantia

2. Fucus

3. Funaria

4. Chlamydomonas

Q.

Zygotic meiosis is observed in

1. gymnosperms

2. pteridophytes

3. bryophytes

4. algae

Q. Which of the following algae exhibit diplontic life cycle?

1. Volvox
2. Spirogyra
3. Fucus
4. Ectocarpus

Q. Identify plant species and stages at which mitosis is seen in haploid cells

Q. Plants that produce embryo and spores but lack seed and vascular tissue belong to

1. Angiosperms
2. Bryophyte
3. Gymnosperms
4. Pteridophytes

Q.

Name two examples of heterosporous pteridophytes.

Q. Which of the following algae has a haplontic life cycle?

1. Ectocarpus
2. Polysiphonia
3. Fucus
4. Volvox

Q.

Meiosis does not occur in

1. Asexually reproducing diploid individuals

2. Sexually reproducing haploid individuals

3. Sexually reproducing diploid individuals

4. All of the above

Q.

What do you mean by Sporophyte?

Q. Megasporophyll of pteridophyte is comparable to which structure of angiosperms?

1. Carpel
2. Microsporophyll
3. Stamen
4. Ovule

Q. Which of the following are homosporous pteridophytes?
I. Selaginella II. Lycopodium
III. Salvinia IV. Equisetum

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

Q.

What does the diplontic life cycle involve?

Q.

Describe the alternation of generation in gymnospores?

Q. The alternation of gametophytic generation from a sporophytic generation occurs as a result of

1. mitosis
2. meiosis
3. oogamy
4. isogamy

Q.

Cycas and adiantum resemble each other in having

1. Seeds

2. Motile sperms

3. Cambium

4. Vessels

Q.

Which of the following statements is not true for bryophytes?

1. Their spores germinate to produce gametophytes

2. Their zygote undergoes meiosis and then produces a sporophyte

3. They lack vessels and sieve tubes

4. They are photosynthetic

Q. The dominant photosynthetic phase in a haplontic life cycle is the

1. gametophyte
2. zygote
3. gamete
4. sporophyte

Q. Rhizoids in bryophytes can be unicellular or multicellular.

1. True
2. False

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 false

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 true and R explains A

Q. Mendel chose Pisum sativum (garden pea) as the experimental plant. Which of these was not a reason for choosing this plant?

1. Short lifespan
2. Low cost of maintenance
3. Only 14 chromosomes
4. Self-fertilising

Q. Haplontic life cycle is exhibited by

1. Fucus
2. Ectocarpus
3. Polysiphonia
4. Volvox

Q. What represents the gametophytic generation in pteridophytes?

1. Main plant body
2. Heart-shaped prothallus
3. Structure surrounded by kidney-shaped indusium
4. Stomium

Q.

In lower plants gametes are produced by ________ division.

1. Mitotic

2. Meiotic

3. Equal

4. Binary

Q. Which among the following shows haplontic life cycle?

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 (I) & (II)

4. Statements (II) & (III)

Q. Which of the statements below is false?

1. Flagellated stage is absent in the life cycle of blue green algae
2. Free living gametophyte are not found in gymnosperms and angiosperms
3. Spirogyra and Chlorella are examples of filamentous algae
4. Agar-agar is obtained from Gelidium and Gracilaria which are examples of red algae

Q.

In most of the Algal genera, the dominant phase of life cycle is

Q.

Question 9

With respect to fungal sexual cycle, choose the sequence of events.

(a) Karyogamy, Plasmogamy and Meiosis

(b) Meiosis, Plasmogamy and Karyogamy

(c)Plasmogamy, Karyogamy and Meiosis

(d) Meiosis, Karyogamy and Plasmogamy

Q. Dikaryophase i.e., two nuclei per cell is found during the reproductive stage of:
a. Ascomycetes
b. Basidiomycetes
c. Phycomycetes
d. Deuteromycetes

1. a and b
2. c and d
3. a and c
4. b and d

Q. Heteroblastic development refers to

1. two types of spores on the same plant
2. any adult organ, which is physiologically different from juvenile structure
3. vegetative growth and flowering in different seasons
4. male and female sex organs on the same plant