Class 11 Biology Important Chapter 3 Plant Kingdom

Class 11 Biology Important Chapter 3 Plant Kingdom Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Biology Important Solutions and select need one. AHSEC Class 11 Biology Additional Notes English Medium Download PDF. HS 1st Year Biology Important Solutions in English.

Class 11 Biology Important Chapter 3 Plant Kingdom

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 11 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Biology Important Notes in English for All Chapters, You can practice these here.

Plant Kingdom

Chapter: 3

IMPORTANT QUESTION AND ANSWER

Very Short and Short Answer Type Question: 

1. Mannitol is reserve food material of which group of algae.

Ans. Phaeophyceae.

2. Give the name of pigment which gives color to red algae.

Ans. Phycoerythrin.

3. Why bryophytes are called amphibians of plant kingdom?

Ans. External layer of water is essential for swimming of male gametes to archegonium. Hence called terrestrial amphibians.

4. Which are the pigments responsi-ble for red colour of red algae ?

Ans. Phycobilins, Phycocyanin. Phycoerythrin and

5. Name a unicellular algae.

Ans. Chlamydomonas.

6. Which system of classification is based on evolutionary and genetic relationships of organisms?

Ans. Phylogenetic system of classification.

7. Name some common forms of Phaeophyceae.

Ans. Fucus, Sargassum, Laminaria and Ectocarpus etc.

8. Name a heterosporous pteridophyte.

Ans. Selaginella.

9. How mosses prevent soil erosion?

Ans: Since they form dense met on soil, they reduce the effect of falling rain on the soil.

10. What are phycocolloids?

Ans: Fucoxanthin, chlorophyll ‘a’ and ‘c’ and cellulosic cell wall  in the brown algae constitute the phycocolloids. 

11. Write in brief on gemmae of liverworts.

Ans. Vegetative reproduction in liverworts is by gemmae. Gemmae are green structures borne inside gemma cups. One gemma gives two new thalli.

12. What is economic significance of bryophytes.

Ans: Mosses form dense mat over soil and prevent soil erosion. Mosses take part in building soil on rocky surfaces. Sphagnum: has water retention capacity. Sphagnum produces dark spongy mass called peat which is used as fuel and manure.

13. What is the difference between gametophyte of bryophytes and Pteridophytes.

Ans: Bryophytes Multicellular diploid sporophyte lives as a parasite on independent multicellular haploid gametophyte. Pteridophytes Both sporophyte and gametophyte (n) are independent. Sporophyte phase is longer lived while gametophyte phase is Prothallus and shorter lived.

14. Explain the commercial uses of algae.

Ans. Gelidium and Gracilaria are source of agar. Porphyra is edible agar. Rhodomela and Polysiphonia are source of bromine. Laminaria and Fucus are source of food, manure, algin and iodine. Sargassum is source of food, manure and algin. Ulva and Chlorella is used as protein supplement in food.

15. Write in detail about female gametophyte in angiosperms.

Ans. Female gametophyte or embryo sacs develop upto 8 nucleate state before fertilization. It has three cell egg apparatus (one egg cell or oosphere and two synergids), 3 antipodal cells and 2 polar nuclei. Two polar nuclei fuse to form diploid secondary nucleus.