Pinus seed cannot germinate and establish without fungal association This is because
- it has very hard seed coat.
- its seeds contain inhibitors that prevent germination.
- its embryo is immature.
- it has obligate association with mycorrhizae
The Correct Option is D
Solution and Explanation
Top Questions on Gymnosperms
- Which one of the following is not found in Gymnosperms?
- NEET (UG) - 2024
- Biology
- Gymnosperms
- Given below are two statements:
Statement I: IAA is transported from cell to cell and the transport is unidirectional (polar).
Statement II: Auxins induce the adventitious roots on cuttings and inhibit the leaf and fruit abscission.
In the light of the above Statements, choose the most appropriate answer from the options given below:- CUET (PG) - 2023
- Biology
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- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): The gymnosperms are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation.
Reasons (R): Common examples gymnosperms are Psilotum and Lycopodium.
In the light of the above Statements, choose the correct answer from the options given below:- CUET (PG) - 2023
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- Types of cells in two celled pollen grains are ____.
- CUET (UG) - 2022
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- Canada Balsam is obtained from the plant :
- UPSEE - 2018
- Biology
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Questions Asked in NEET exam
- Given below are two statements:
Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO, fixation is decreased.
Statement II: In C4 plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2024
- respiration in plants
- Given below are two statements :
Statement I : In the nephron, the descending limb of loop of Henle is impermeable to water and permeable to electrolytes.
Statement II : The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.
In the light of the above statements, choose the correct answer from the option given below :- NEET (UG) - 2024
- Nephrons
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector\(\vec{P}\) of magnitude, 4 × 10-6 C m, is ± 9 × 103 V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :- NEET (UG) - 2024
- Magnetic Field
- \(^{290}_{82}X\stackrel{\alpha}{\rightarrow}Y\stackrel{e^+}{\rightarrow}Z\stackrel{\beta^-}{\rightarrow}P\stackrel{e^-}{\rightarrow}Q\)
In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are :- NEET (UG) - 2024
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- In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x (kcal m-2)yr-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
- NEET (UG) - 2024
- Ecosystems
Concepts Used:
Gymnosperms
Gymnosperms are flowerless plants that produce cones and seeds. It literally means "naked seed". They sit exposed on the surface of leaf-like structures called bracts. Gymnosperms are vascular plants of the subkingdom Embyophyta and include conifers, cycads, ginkgoes, and gnetophytes. They are abundant in temperate forest and boreal forest biomes with species that can tolerate moist or dry conditions.
Characteristics of Gymnosperms
- They do not produce flowers.
- Seeds are not formed inside a fruit.
- They are found in colder regions where snowfall occurs.
- They form cones with reproductive structures.
- Xylem does not have vessels and the phloem and it has no companion cells and sieve tubes.