Plant Kingdom · Question 28

Which of the following statements is correct?

1. Selaginella is heterosporous, while Salvinia is homosporous.
2. Stems are usually unbranched in both Cycas and Cedrus
3. Ovules are not enclosed by ovary wall in gymnosperms
4. Horsetails are gymnosperms

Which one is wrongly matched?

1. Biflagellate zoospores – Brown algae
2. Uniflagellate gametes – Polysiphonia
3. Unicellular organism – Chlorella
4. Gemma cups – Marchantia

An example of colonial alga is

1. Volvox
2. Ulothrix
3. Spirogyra
4. Chlorella

Select the mismatch

1. Cycas – Dioecious
2. Salvinia – Heterosporous
3. Equisetum – Homosporous
4. Pinus – Dioecious

Zygotic meiosis is characteristic of

1. Fucus
2. Funaria
3. Chlamydomonas
4. Marchantia

Life cycles of Ectocarpus and Fucus respectively are

1. diplontic, haplodiplontic
2. haplodiplontic, diplontic
3. haplodiplontic, haplontic
4. haplontic, diplontic

Select the correct statement

1. Sequoia is one of the tallest trees.
2. The leaves of gymnosperms are not well adapted to extremes of climate.
3. Gymnosperms are both homosporous and heterosporous.
4. Salvinia, Ginkgo and Pinus all are gymnosperms.

In bryophytes and pteridophytes, transport of male gametes requires

1. birds
2. water
3. wind
4. insects.

Conifers are adapted to tolerate extreme environmental conditions because of

1. broad hardy leaves
2. superficial stomata
3. thick cuticle
4. presence of vessels.

Which one of the following statements is wrong?

1. Algae increase the level of dissolved oxygen in the immediate environment.
2. Algin is obtained from red algae, and carrageenan from brown algae.
3. Agar-agar is obtained from Gelidium and Gracilaria.
4. Laminaria and Sargassum are used as food.