Plant Kingdom Question And Answers

Class 11 Biology WBCHSE Plant Kingdom Some Important Questions And Answers

Question 1. Why plants belonging to class bryophyta are called amphibious plants?
Answer: As bryophyta lacks a typical root system, so they grow in water and their gametes are transferred by water. Though they lack well well-developed vascular system, water is conducted in their body through fine ducts. Although they require an aquatic medium for their life cycle, yet they can survive in moist places. Hence, they are called amphibious plants.

Question 2. What do you understand by homospores and heterosporous plants?
Answer: The structurally and characteristically identical spores that develop inside the sporangia of the pteridophytes are called homospores and the plants producing such spores are called homosporous plants. example Lycopodium sp. The structurally and characteristically non-identical spores (male and female) that develop inside the respective sporangia of the pteridophytes are called heterospores and the plants producing such spores are called heterosporous. example Selaginella sp.

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Question 3. What is megasporangium and microsporangium?
Answer: Sporangium in heterosporous pteridophytes is variable in size. The larger sporangium containing megaspores is called megasporangium and the smaller sporangium containing microspores is called microsporangium.

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Question 4. what is ephedrine?
Answer: Ephedrine is an alkaloid obtained from Ephedra sp. which is used to prepare medicine of the same name. This is used to treat asthma and other respiratory disease. It helps to increase heart rate and blood pressure.

Question 5. What is polyembryony?
Answer: Polyembryony is the phenomenon where two or more embryos develop from a single fertilized egg. In Pinus sp., polyembryony has been reported.

Question 6. What is operculum?
Answer: The cap-like structure present above the capsule of mosses (for example Funaria sp., Pogonatum sp., etc.), is called an operculum. It helps in the dispersal of spores in Funaria sp.

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Question 7. What is peristome?
Answer: Beneath the operculum of some mosses (for example Funaria sp.), teeth-like structures are seen to be arranged in 2 rows 32 in number which helps in the dispersal of spores. These are called peristomes.

Class 11 Biology WBCHSE Plant Kingdom Very Short Answer Type Question

Question 1. Name the branch of science that deals with the study of algae.
Answer: The branch of science that deals with the study of algae is called phycology.

Question 2. Which component is responsible for the color of red algae?
Answer: The pigment that imparts color to red algae is r-phycoerythrin.

Question 3. Name one red algae which is used as a vegetable.
Answer: Algae which is used as a vegetable is Porphyra

Question 4. What are the types of flagella found in the members of Phaeophyceae?
Answer: Two types of flagella present in Phaeophyceae, are whiplash and tinsel.

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Question 5. Which algal group stores mannitol as reserve food?
Answer: Mannitol is the stored food of the algal group Phaeophyceae.

Question 6. Which algae is used commercially to produce algin?
Answer: Laminaria is used commercially to produce algin.

Question 7. Which algae is used commercially to produce agar?
Answer: Gellidium is used commercially to produce agar

Question 8. Which algae is considered to be the ancestor of terrestrial plants?
Answer: Green algae is considered the ancestor of plants.

Question 9. Which alga reproduces sexually by conjugation?
Answer: Spirogyra reproduces by conjugation

Question 10. Write the divisions of the plant whose main body is gametophytic.
Answer: The main plant bodies of algae and moss are gametophytic.

Question 11. Write the scientific name of Peat moss.
Answer: The scientific name of Peat moss is Sphagnum

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Question 12. Which structure is formed after the germination of spores of moss?
Answer: Protonema is formed by germination of spores in moss.

Question 13. Which group of plants have multicellular sex organs surrounded by a jacket of sterile cells but lack a vascular system? Give an example.
Answer: Bryophytes have multicellular sex organs, surrounded by a jacket of sterile cells but lack a vascular tissue system. An example of Bryophyte is Pogonatum sp.

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Question 14. Name the tree which is commonly called ’ Sago’s palm’.
Answer: Cycas reuolutais commonly called ‘Sago palm!

Question 15. Name the plant which is commonly called ’maiden J hair fern’.
Answer: Adiantum is commonly called as ‘maidenhair fern

Question 16. What are the common features found in leaves of ferns and Cycas?
Answer: A common feature in leaves of fern and Cycas is the circinate ptyxis.

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Question 17. Name the plant which produces the largest sperm in the plant world.
Answer: Cycas have the largest sperm in the plant world.

Question 18. Which part of the ovule of gymnosperms is haploid (n)?
Answer: The endosperm of gymnosperms is haploid (n).

Question 19. What is sorus?
Answer: Sorus (plural—sori) is the aggregation of sporangia produced on the fronds of fem.

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Question 20. Name the protective covering over the sporangium of the fern
Answer: Stomium is the covering of the sporangium of the fem.

Question 21. What is the hairy structure on the surface of young leaves and petioles of ferns called?
Answer: The hairy structure on the surface of young leaves and petiole of fem is called ramenta.

Question 22. How many generations are seen in the seeds of Pinusl
Answer: Three generations are seen in the seeds of Pinus.

Question 23. How many cotyledons are present in the seeds of Pinus?
Answer: The seed of Pinus is multicotyledonous.

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Question 24. What is the genetic constituent of the endosperm of angiosperms?
Answer: The endosperm of angiosperms is triploid.

Question 25. Name one algae that shows a haplo-diplontic life cycle.
Answer: Ulva, a member of Chlorophyceae, shoots haplo-diplontic life cycle.

Question 26. Name the tallest angiospermous plant.
Answer: The tallest angiosperm is Eucalyptus regnans.

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Question 27. Name one parasitic red algae.
Answer: Harveylla is a parasitic red algae.

Question 28. Which plant is known as a vascular non-flowering plant?
Answer: Ferns are called vasculature,non-flowering plant

Question 29. Generally, which plant is called a walking fern’?
Answer: Adiantum is called the walking fern.

Question 30. What is the basis of the classification of algae?
Answer:

Bases of classification of algae are—

1. Types of pigments,
2. Type of reserved food

Question 31. Food is stored as Floridian starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?
Answer: Mannitol is the reserve food material of Phaeophyceae

Question 32. The plant body in higher plants is well differentiated and well developed. Roots are the organs used for the purpose of absorption. What is the equivalent of the roots in the less developed lower plants?
Answer: Rhizoids are the equivalent of the roots in the less developed lower plants.

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Question 33. The fusion of two gametes which are dissimilar in size is termed as
Answer: Anisogamy

Question 34. Most algal genera show haplontic life cycle. Name an alga which is

1. Haplo-diplontic
2. Diplontic.

Answer:

1. Haplo-diplontic: Ulva sp.
2. Diplontic: Fucus sp.

Question 35. Give an example of plants with—

1. Haplontic life cycle,
2. Diplontic life cycle,
3. Haplo-diplontic life cycle

Answer:

1. Volvox (Haplontic),
2. Fucus (Diplontic),
3. Polysiphonia (Haplo-diplontic)