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Test: Gymnosperms (NCERT) - NEET MCQ

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15 Questions MCQ Test Biology Class 11 - Test: Gymnosperms (NCERT)

Test: Gymnosperms (NCERT) for NEET 2024 is part of Biology Class 11 preparation. The Test: Gymnosperms (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Gymnosperms (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Gymnosperms (NCERT) below.
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Test: Gymnosperms (NCERT) - Question 1

Which gymnosperm is one of the tallest tree species and is famously known as the giant redwood tree?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 1

Sequoia is one of the gymnosperms and is renowned for being one of the tallest tree species.

Fig: Sequoia

Test: Gymnosperms (NCERT) - Question 2

Which of the following statements is correct?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 2

Option 1:

  • Genus Equisetum is also known as horsetails.
  • It is an example of pteridophyte and not Gymnosperms.

Option 2:

  • Selaginella and Salvinia both are pteridophytes.
  • They both are heterosporous as they produce two different types of spores- microspores and megaspores.
  • Microspores and megaspores form male and female gametophytes respectively.

Option 3:

  • Cycas and Cedrus both belong to Gymnosperms.
  • Cycas has unbranched stems whereas Cedrus has branched stems.

Option 4:

  • Gymnosperms are seed-bearing vascular plants in which ovules/seed is not enclosed by the ovary wall. The word gymnosperms itself means naked seeds.
  • They have needle-like leaves. They are generally found in colder regions.

So, the correct answer is option 4. 

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Test: Gymnosperms (NCERT) - Question 3

Seed plants are all

Detailed Solution for Test: Gymnosperms (NCERT) - Question 3
  • Seed plants produce two types of spores, male and female, which develop into respective gametophytes. This characteristic is known as heterospory.
  • The male spore, or microspore, develops into a pollen grain, which is the male gametophyte. The female spore, or megaspore, forms the female gametophyte within the ovule.

This is why the answer is A: heterosporous, because all seed plants have this feature.

Dioecious, Monoecious, and Homosporous

  • Dioecious plants (option B) are those where the male and female reproductive structures are on different individuals. Some seed plants are dioecious, but not all.
  • Monoecious plants (option C) have both male and female reproductive structures on the same individual. This is also a characteristic of some seed plants, but not all.
  • Homosporous plants (option D) produce only one type of spore, not two as in heterospory. This is not a characteristic of seed plants.
Test: Gymnosperms (NCERT) - Question 4

Which of the following statements is incorrect about cycas?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 4

Non-archegoniate Plant: This statement is incorrect. Cycas, like all gymnosperms, is an archegoniate plant. This means that it produces an archegonium, a female sex organ that is part of the gametophyte phase of the plant's life cycle. This organ produces egg cells for fertilization. In Cycas, the archegonial complex is located within the ovule, which is housed in the female cone. So, it is not a non-archegoniate plant.

Other Options:

  • Unbranched Stem: Cycas indeed has an unbranched stem. This means the stem grows straight upwards without any lateral branches. This is a characteristic of most Cycad species.
  • Pinnately Compound Leaves: It is true that Cycas possesses pinnately compound leaves. This means the leaves are divided into leaflets that are arranged along the central stem of the leaf, much like the feathers on an arrow.
  • Dioecious Plant: Cycas is a dioecious plant, which means that male and female reproductive organs are found on separate individual plants. One plant will have only male cones that produce pollen, while another plant will have only female cones that produce seeds.
Test: Gymnosperms (NCERT) - Question 5

The covering outside an ovule in Gymnosperms is called as __________

Detailed Solution for Test: Gymnosperms (NCERT) - Question 5
  • The covering outside an ovule in Gymnosperms is called integument.
  • It has a tiny hole at one end that allows germination of pollen grains that are carried to female gametophyte through air and water.
Test: Gymnosperms (NCERT) - Question 6

Select the correct pattern of arrangement of reproductive structures for gymnosperms.

Detailed Solution for Test: Gymnosperms (NCERT) - Question 6

The correct pattern of arrangement of reproductive structures for gymnosperms is:

Spores → Sporangia → Sporophylls → Strobili.
Spores are produced in the Sporangia, which are located on the Sporophylls, and these are arranged in Strobili (cones), which is the main reproductive structure of gymnosperms.

More Explanation on this:
In gymnosperms, spores are the first stage in the reproductive cycle. These are single-celled reproductive units that can develop into a new organism without the need for fertilization. Gymnosperms produce two types of spores: microspores and megaspores.

The spores are contained within structures called sporangia. Sporangia are specialized for spore production and are typically found on the undersides of leaves or within cones in gymnosperms. Each sporangium can produce numerous spores.

Sporophylls are specialized leaves that bear sporangia. In gymnosperms, sporophylls are usually arranged in a cone-like structure. Depending on the type of spore they produce, sporophylls can be either microsporophylls (bearing microsporangia and producing microspores) or megasporophylls (bearing megasporangia and producing megaspores).

Strobili (Cones)
Strobili, or cones, are the reproductive structures of gymnosperms where sporophylls are found. There are male cones that contain microsporophylls and female cones that contain megasporophylls. The male cones release pollen (containing the male gametophyte), which is carried by the wind to the female cones, leading to fertilization and the production of seeds.

Test: Gymnosperms (NCERT) - Question 7

The leaves of gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind, because of which of the following features?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 7

1. Needle-like Leaves:

  • Needle-like leaves are much thinner than the broad leaves of other plants. This reduces the surface area that is exposed to the harsh environmental conditions, thereby limiting water loss through transpiration.

2. Thick Cuticle:

  • The cuticle is a waxy layer that covers the leaves of gymnosperms. It serves as a barrier that protects the plant from water loss and damage from external factors such as wind and extreme temperatures.

3. Sunken Stomata:

  • Stomata are small pores on the surface of leaves that allow for gas exchange. In gymnosperms, these stomata are often sunken or recessed into the leaf tissue.

In conclusion, all these features - needle-like leaves, thick cuticle, and sunken stomata - work together to help gymnosperms withstand extreme conditions of temperature, humidity, and wind.

Test: Gymnosperms (NCERT) - Question 8

Which of the following gymnosperms has branched stems?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 8

Pinus and Cedrus have branched stem. The main stem shows monopodial branching. Stem branches are of two types, long and dwarf. The dwarf branches possess 1-5 needle-like follage leaves Which are surrounded at the base by a sheath of scale leaves.

Test: Gymnosperms (NCERT) - Question 9

What type of roots do some gymnosperms like Pinus have, which are associated with fungal mycorrhiza?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 9

The specific term "mycorrhizal roots" would more accurately describe the symbiotic relationship rather than the physical form of the roots, and gymnosperms like Pinus generally start with a tap root system, which may not perfectly capture the essence of the mycorrhizal association but aligns more closely with the root structure potentially involved in such symbiosis.

Test: Gymnosperms (NCERT) - Question 10

Mycorrhizal roots of ____ are associated with some fungal symbionts.

Detailed Solution for Test: Gymnosperms (NCERT) - Question 10

A mycorrhiza is a symbiotic association of a fungus with a root system. The mycorrhizal roots of Pinus occur near the soil surface. They are devoid of root hair and root cap. The fungus commonly associated with mycorhizic roots of Pinus is Boletus elegans.

Test: Gymnosperms (NCERT) - Question 11

What is the primary mode of pollen grain dispersal in gymnosperms?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 11

Pollen grains in gymnosperms are primarily dispersed by wind, which carries them to the opening of the ovules borne on megasporophylls.

Test: Gymnosperms (NCERT) - Question 12

In gymnosperms, what is the primary characteristic of seeds?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 12

Gymnosperms are characterized by seeds that are not enclosed by any ovary wall and remain exposed both before and after fertilization. This is in contrast to angiosperms where seeds are enclosed within a fruit.

Test: Gymnosperms (NCERT) - Question 13

In gymnosperms, where do the male and female cones or strobili develop?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 13

Gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and Gnetales. They are characteristically woody plants with a main stem or trunk and branches. One of the distinctive features of gymnosperms is their reproductive structures, which are cones or strobili.

  • Location of Cones: In gymnosperms, both male and female cones develop on the same tree. This is a key feature of many gymnosperms, although there are some exceptions.
    (i) Male Cones: The male cones, also known as pollen cones or microstrobili, are typically smaller than the female cones and are usually located lower on the tree. They produce pollen, which is carried by the wind to the female cones.
    (ii) Female Cones: The female cones, also known as seed cones or megastrobili, are usually larger and located higher up on the tree. They produce ovules, which, when fertilized by pollen, develop into seeds.
Test: Gymnosperms (NCERT) - Question 14

Gymnosperms do not include

Detailed Solution for Test: Gymnosperms (NCERT) - Question 14

Living gymnosperms are predom inantly middle sized trees (Cycas) to tall trees (Pinus) and shrubs (Ephedri Rarely they are woody climbers (Gnetum montanum). Their are no herbs in gymnosperms.

Test: Gymnosperms (NCERT) - Question 15

Gymnosperm called as a living fossil is

Detailed Solution for Test: Gymnosperms (NCERT) - Question 15

The gymnosperms are comparatively more ancient than the angiosperms in evolutionary terms. Most of the gymnosperms have now become extinct and the group is presently represented by only 900 living species. The living gymnosperms are widely distributed in the cold climates where snow is the source of water. Cycas and Ginkgo are referred to as living fossils.

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