Question

_28. Seed plants: A) are all heterosporous; B) have motile sperm; C) have photosynthetic, free- living gametophytes; D) are all monoecious; E) none of the above 29. The first land plants share a most recent common ancestor with a group of aquatic organisms that lived in the littoral zone known as: A) charophyceans; B) chlorophytes; C) catphytes; D) coanocytes; E) cycadophytes 30. Which of the following is true for organisms with zygotic meiosis? A) The gametes are produced from haploid cells via mitosis. B) The gametes are produced from diploid cells via meiosis. C) The zygote develops an embryo. D) The diploid generation is dominant in the life cycle. E) The zygote undergoes meiosis to form gametes. 31. Dioecious means: A) the gametes are both formed on the same gametophyte; B) the diploid individual forms both pollen and ovules; C) the plant drops its leaves every fall and forms new ones every spring; D) the sporophyte plant is unisexual; E) none of the above 32. Conifer seeds are characterized by which of the following features? A) The female gametophyte tissue serves to nourish the embryo in seeds. B) They are formed as part of a heterosporous life cycle. C) They are produced exposed on the surface of a sporophyll. D) They are dispersal and over-wintering propagules. E) All of these are characteristics of conifer seeds. 33. The multicellular haploid stage of terrestrial ferns: A) is dependent on the sporophyte for nutrition; B) produces gametes via meiosis; C) is the dominant stage in the life cycle; D) is non- photosynthetic; E) none of the above 34. Mycorrhizae: A) are fungi associated with the roots of most terrestrial plants; B) provide water to plants; C) were associated with the first land plants 470-500 mya; D) provide N, P and K to plants; E) all of the above 35. The first flowers: A) were cone-like, unisexual and all female; B) evolved in response to insect (beetle) predation and were insect pollinated; C) evolved from a fern ancestor; D) evolved approximately 290 million years ago; E) were wind pollinated 36. A fruit develops from which tissue? A) ovary; B) ovule; C) oogonium; D) oocyte; E) outacyte 37. The red algae (Rhodophyta): A) are more common in warm, tropical waters; B) produce agar; C) lack motile cells; D) are used to make nori; E) all of the above 38. In a flowering plant life cycle: A) the female gametophyte is photosynthetic and free-living: B) it takes two years for the seeds to mature; C) the megaspore undergoes three successive mitosis without cytokinesis to form an 8-nucleate stage; D) the gametes are formed by meiosis; E) the pollen grains are diploid

Answer 1

Note: Only the first four questions/parts can be answered at once. Therefore, question (28,29,30,31) are solved correctly.

Question 28:

Answer: Option A) are all heterosporous.

Explanation: All of the seed plants (i.e, spermatophytes) are heterosporous. They form two types of spores:

• Megaspores (female) and
• Microspores (male).

Question 29:

Answer: Option B) chlorophytes.

Explanation: The Chlorophytes (i.e, all green algae) and the plants have a common evolutionary ancestor and both of them has the photosynthetic pigments chlorophyll a and chlorophyll b present in them.

Question 30)

Answer: Option A) The gametes are produced from haploid cells via mitosis.

Explanation: The organisms which undergo zygotic meiosis are fundamentally produced from the haploid (1n) cells via mitosis. The growth and also the mitotic cell divisions always involve haploid cells.

Question 31)

Answer: Option C)  the plants drops its leaves every fall and forms new one every spring.

Explanation: dioecious plants have separate male and female parts and they drop their leaves every fall and then form new ones in the spring season.