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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

Mycorrhizal roots of ____ are associated with some fungal symbionts.

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

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 2

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

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

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:
Spores
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.

Sporangia
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
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.

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Test: Gymnosperms (NCERT) - Question 3

Which of the following gymnosperms has branched stems?

Detailed Solution for Test: Gymnosperms (NCERT) - Question 3

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 4

In which one of the following, the male and female gametophytes don't have free-living independent existence?

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

The correct answer is:

Option 4: Cedrus

Explanation: In Cedrus (a gymnosperm), the male and female gametophytes do not have a free-living independent existence. Instead, they are dependent on the sporophyte for nourishment and protection. In contrast, in Pteris (a fern), Funaria (a moss), and Polytrichum (another moss), the gametophytes are free-living and independent.

Test: Gymnosperms (NCERT) - Question 5

Read the following statements :

A.     The male or female cones or strobili may be borne on same tree in Pinus.

B.     In Cycas male cones and megasporophylls are borne on different trees.

C.     Stem of Cycas is branched and of Pinus and Cedrus is unbranched.

D.     In gymnosperms generally tap roots are found.

Select the correct statements.

Detailed Solution for Test: Gymnosperms (NCERT) - Question 5

Correct answer:. A, B, D

Explanation:

  • Statement A is correct: In Pinus, male and female cones are typically borne on the same tree (monoecious).
  • Statement B is correct: In Cycas, male cones and megasporophylls (female cones) are borne on different trees (dioecious).
  • Statement C is incorrect: The stem of Cycas is unbranched, while the stems of Pinus and Cedrus can be branched.
  • Statement D is correct: Gymnosperms generally have tap roots.
Test: Gymnosperms (NCERT) - Question 6

Question:
Which of the following statements about gymnosperms is correct?

  1. Gymnosperms are homosporous and produce only microspores.
  2. The reduced male gametophyte in gymnosperms is known as the microsporangia.
  3. The female strobili bear megasporophylls with ovule or megasporangia.
  4. The multicellular female gametophyte develops within the megasporangium and is retained there.
Detailed Solution for Test: Gymnosperms (NCERT) - Question 6

Correct answer: 3 and 4

Explanation:

  • Statement 1 is incorrect: Gymnosperms are heterosporous, they produce haploid microspores and megaspores.
  • Statement 2 is incorrect: The reduced male gametophyte is called a pollen grain, not the microsporangia.
Test: Gymnosperms (NCERT) - Question 7

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

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

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 8

 During the reproductive process of gymnosperms:

A. The megaspore mother cell is differentiated from one of the cells of the nucellus
B. The nucellus is protected by envelopes, forming the ovule.
C. The ovules are borne on megasporophylls which may be clustered to form the female cones

D. The megaspore mother cell divides meiotically to form four megaspores. One of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs

How many correct statements?

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

The megaspore mother cell is differentiated from one of the cells of the nucellus. The nucellus is protected by envelopes and the composite structure is called an ovule. The ovules are borne on megasporophylls which may be clustered to form the female cones. The megaspore mother cell divides meiotically to form four megaspores. One of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs. The multicellular female gametophyte is also retained within megasporangium

Test: Gymnosperms (NCERT) - Question 9

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 9

In conifers, the needle-like leaves reduce the surface area. Their thick cuticle and sunken stomata also help to reduce water loss.

Test: Gymnosperms (NCERT) - Question 10

Which of the following represents the correct sequence of events during fertilization and seed formation in gymnosperms?

A.The pollen tube carrying the male gametes grows towards archegonia in the ovules
B. Pollen grains are released from the microsporangium.
C..Fertilisation

D. Zygote develops into an embryo.Ovules develop into seeds

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

The pollen grain is released from the microsporangium. They are carried in air currents and come in contact with the opening of the ovules borne on megasporophylls. The pollen tube carrying the male gametes grows towards archegonia in the ovules and discharge their contents near the mouth of the archegonia. Following fertilisation, zygote develops into an embryo and the ovules into seeds. These seeds are not covered

Test: Gymnosperms (NCERT) - Question 11

The features seen in the gymnosperm Cycas include:

I. Coralloid roots

II. Unbranched stems

III. Pinnate persistent leaves for a few years

IV. Male cones and megasporophyllys borne on same plant

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

The correct answer is: C: I, II, and III only

- I. Coralloid roots: Gymnosperm Cycas has coralloid roots that contain symbiotic cyanobacteria, aiding in nitrogen fixation.
- II. Unbranched stems: Cycas exhibits unbranched stems, which is a characteristic feature of this gymnosperm.
- III. Pinnate persistent leaves for a few years: Cycas has pinnate leaves that persist for several years, contributing to its distinct appearance.
- IV. Male cones and megasporophylls borne on the same plant: This option is incorrect as male and female reproductive structures are typically on separate Cycas plants.

Test: Gymnosperms (NCERT) - Question 12

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 12

the giant redwood tree Sequoia is one of the tallest tree species

Fig: Sequoia

Test: Gymnosperms (NCERT) - Question 13

In gymnosperms, what is the primary characteristic of seeds?

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

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 14

Where does the development of pollen grains take place?

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

Pollen grains develop in the microsporangia.

Test: Gymnosperms (NCERT) - Question 15

What distinguishes gymnosperms from bryophytes and pteridophytes regarding the male and female gametophytes?

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

Unlike bryophytes and pteridophytes, in gymnosperms the male and the female gametophytes do not have an independent free-living existence. They remain within the sporangia retained on the sporophytes.

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