CLEP - Biology Plant Reproduction and Structure Questions and Answers

Question 1

In angiosperms, which of the following structures is the female reproductive organ that contains the ovules?

Accepted Answer

Pistil

Answer

The pistil, also known as the carpel, is the female reproductive part of a flower. It consists of the stigma (receives pollen), style (connects stigma to ovary), and the ovary, which houses the ovules that develop into seeds after fertilization.

Question 2

Which of the following statements accurately describes the process of double fertilization in flowering plants?

Accepted Answer

One sperm nucleus fertilizes the egg to form the zygote, and the other fuses with the two polar nuclei to form the endosperm.

Answer

Double fertilization is a unique process in angiosperms where two fertilization events occur. One sperm nucleus from the pollen tube fuses with the egg cell to form the diploid (2n) zygote, which becomes the embryo. The second sperm nucleus fuses with the two polar nuclei in the central cell to form a triploid (3n) cell, which develops into the endosperm, a nutritive tissue for the embryo.

Question 3

In the life cycle of a fern, which of the following structures represents the dominant, diploid (2n) sporophyte generation?

Accepted Answer

The mature frond

Answer

The large, leafy plant that is commonly recognized as a fern is the diploid (2n) sporophyte. This is the dominant generation in the fern life cycle. The prothallus is the small, haploid (n) gametophyte; a spore is a haploid (n) reproductive cell that grows into the gametophyte; and the archegonium is the egg-producing organ on the haploid gametophyte.

Question 4

A botanist examining a plant stem cross-section observes vascular tissue composed of non-living cells forming continuous tubes. This tissue is found to be responsible for the bulk flow of water and dissolved minerals from the roots. Which tissue is being observed?

Accepted Answer

Xylem

Answer

Xylem is the vascular tissue responsible for transporting water and minerals from the roots to the rest of the plant. It is composed of cells (tracheids and vessel elements) that are dead at maturity, forming hollow tubes ideal for the bulk flow of water. Phloem transports sugars, the epidermis is the outer protective layer, and parenchyma is a ground tissue with various functions.

Question 5

A plant species produces seeds that are lightweight and possess large, feathery structures. These adaptations are most characteristic of which primary mode of seed dispersal?

Accepted Answer

Dispersal by wind (anemochory)

Answer

Features such as being lightweight and having feathery or wing-like structures increase the seed's surface area and buoyancy in the air, allowing it to be carried over long distances by air currents. This method of dispersal is known as anemochory, or wind dispersal.

CLEP Practice Test

CLEP Practice Test

CLEP - Biology Plant Reproduction and Structure Questions and Answers