Question

Which of the following members of spermatophyte is able to produce seed but not cones?
A. Eucalyptus and Wolfia
B. Pinus and Cycas
C. Pteris and Dryopteris
D. Eucalyptus and Pinus

Answer 1

Hint: There are diverse types of plants on this planet. Some are seed-bearing and some are non-seed bearing plants. They all have different characteristics. Gymnosperms and angiosperms are the most diverse groups In spermatophyte division. One of them has naked seeds while the other has fruit with seeds.

Complete answer:
 Spermatophytes are the plants with male and female cones. They usually show xerophytic properties like needle-shaped leaves, sunken stomata etc. They have tracheids but lack companion cells in the phloem.
They include gymnosperms with naked seeds and angiosperms with fruit covering seeds.
Option A: Eucalyptus and Wolfia: Eucalyptus is one of the useful plants having antioxidant property. It does not have cones but produces seeds. Wolfia is the smallest flowering plant on Earth. They are aquatic plants thus they can produce seed but do not have cones.
Option B: Pinus and Cycas: Fruit of this pine is formed from the seed which is edible. They are called chilgoza. Cycas belongs to the Cycads group of gymnosperms. They don't have flowers or fruits. They look like palm trees with no branches.
Option C: Pteris and Dryopteris: They both are Pteridophytes so are not included in the spermatophyte category. They are wood ferns.
Option D: Eucalyptus and Pinus: Eucalyptus is one of the useful plants having antioxidant properties. It does not have cones but produces seeds. Fruit of this pine is formed from the seed which is edible. They are called chilgoza. They have both male and female cones. They can be on the same tree as well as on the different tree. The male cones are smaller than the female cones.

Hence the correct answer is OPTION(A)

Note: Eucalyptus is one of the useful plants having the antioxidant property, it is used to treat dry skin and reduce pain. It is a xerophytic leaf plant having palisade cells on both sides of leaves. Wolfia is also called duckweed. They make the floating mat in the water body they grow. For example – Lemna. They have a good amount of protein in them.