Practice MCQ Questions and answers on Biology-GK

Blood is connective tissue.

The layer of cells between endodermis and vascular bundles is called pericycle.

Gymnosperms are a group of seed-producing plants that include conifers, cycads, Ginkgo, and gnetophytes. They are characterized by the following features:

Presence of seeds in cones: Gymnosperms produce seeds that are not enclosed within a fruit but are typically borne naked on the surface of cone scales or other structures. These cones are the reproductive structures of gymnosperms.

Absence of seeds: This is incorrect. Gymnosperms are seed-producing plants, and they produce seeds, albeit without an enclosing fruit.

Presence of flowers: Gymnosperms do not produce flowers. Instead, they reproduce through cones or similar structures.

Absence of vascular tissues: This is incorrect. Gymnosperms possess vascular tissues, including xylem and phloem, for the transport of water, nutrients, and sugars throughout the plant.

Therefore, Option C accurately describes one of the key characteristics of gymnosperms.

In bisexual flower the production of male and female flower androecium and gynoecium mature at different times to avoid self-fertilization. That is called dichogamy.

The pollen grains of Pinus are carried to its female cone through the wind.

A seed is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth with in the mother plant.

Technically, apple is not a true fruit. A fruit is a ripened ovary. Inside the apple fruit , the structure holding the seeds is actually the fruit while the edible fleshy part is actually the swollen wall material of ovary.

In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm. Hence, double fertilization is unique to flowering plants.

Pollination is a crucial ecological process that aids sexual reproduction in flowering plants. Although a variety of animals are known to bring about pollen transfer, pollination by snails (malacophily) has remained a rare and obscure phenomenon.

A seed is a ripened ovule.