Question

Cycas and adiantum resemble each other in having

• A. Seeds
• B. Motile sperms
• C. Cambium
• D. Vessels

Answer 1

The correct option is B

Motile sperms

The correct option is B.

Explanation of the correct option:

1. Cycas refers to a gymnosperm.
2. Adiantum is the maidenhair fern growing indoors.
3. Adiantum is a pteridophyte whereas Cycas is a primitive gymnosperm.
4. They both possess multiciliated motile sperm.
5. The sperm easily move towards the egg inside the ovule and fertilize it.

Explanation of the incorrect option:

Option A:

1. Seeds are seen in gymnosperms.
2. Cycas possess seeds.
3. But in the case of pteridophytes, as they are lower plants so no proper flowers or ovules are formed in these plants.
4. Therefore, pteridophytes do not form any seed.
5. As adiantum is a pteridophyte, it does not possess seeds.

Option C:

1. Cambium refers to the layer of actively dividing cells that are responsible for the secondary growth of stems and roots in plants.
2. As secondary growth is seen in gymnosperms, so cambium is found in these plants.
3. We can see cambium in Cycas.
4. Pteridophytes do not possess any differentiation in stem, root, and leaves.
5. Besides, secondary growth is absent in pteridophytes.
6. As adiantum is a pteridophyte so it does not have cambium.

Option D:

1. Normally vessels are found in flowering plants (angiosperms).
2. As cycas is a gymnosperm, they do not produce flowers so vessels are absent in them.
3. Adiantum is a pteridophyte and they are also flowerless.
4. So Adiantum also does not possess vessels.

Final answer: Cycas and adiantum resemble each other in having motile sperms.