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HBSE Class 11 Biology SAT-1 Question Paper 2024 Answer Key
Instructions :
• All questions are compulsory.
• Questions (1-9) carry 1 mark each.
• Questions (10-12) carry 2 marks each.
• Questions (13-14) carry 3 marks each.
• Question (15) case study, carry 4 marks.
• Questions (16-17) carry 5 marks each.
1. Water vascular system is the characteristic of :
(a) Echinoderms
(b) Porifera
(c) Mollusca
(d) Coelenterata
Answer – (a) Echinoderms
2. Alternate type of Phyllotaxy where a single leave arise at each node in alternate manner is found in :
(a) China rose plant
(b) Mustard plant
(c) Sunflower plant
(d) all the above
Answer – (d) all the above
3. Equisetum is :
(a) Bryophyte
(b) Pteridophyte
(c) Angiosperm
(d) Gymnosperm
Answer – (b) Pteridophyte
4. Albugo belongs to :
(a) Ascomycetes
(b) Phycomycetes
(c) Basidiomycetes
(d) Deuteromycetes
Answer – (b) Phycomycetes
5. Segmentation in the body is first observed in ……………
Answer – Annelida
6. The order of Homo sapiens is …………..
Answer – Primata
7. Give an example, in which the ovary is inferior.
Answer – Guava
8. Write the scientific name of mango.
Answer – Mangifera Indica
9. Assertion (A) : In the Two-Kingdom classification system, bacteria, blue-green algae and fungi were placed under plants.
Reason (R) : These all organisms had cell walls in their cells.
Answer – Both assertion (A) and reason (R) are true and the reason (R) is the correct explanation of the assertion (A).
10. What is Venation? What are various types of it?
Answer – The arrangement of veins and veinlets in the leaf lamina is known as venation. There are two types of venation in leaf : Reticulate venation and Parallel venation.
11. Write the unique features of Arthropods.
Answer – Three main features of Arthropods are as follows :
(i) Exoskeleton made up of chitin
(ii) Jointed legs
(iii) Compound eyes
12. What are the main functions of the root system?
Answer – The root system is essential for :
• Providing stability to the plant.
• Uptaking water and essential nutrients from the soil.
• Storing carbohydrates and other nutrients.
• Moving water, nutrients, and synthesised food throughout the plant.
• Facilitating vegetative propagation.
• Maintaining soil structure and preventing erosion.
13. What are the universal rules of nomenclature?
Answer – The universal rules of nomenclature are as follows :
(i) Biological names are in Latin and are written in italics.
(ii) The first word in the name indicates the genus, while the second word denotes its specific epithet.
(iii) The name of the genus should start with a capital letter and the name of the species with a small letter.
(iv) When the name is handwritten, both the words are separately underlined.
14. What is the basis of classification of Algae?
Answer – The absence or presence of pigments is the prime basis for algae classification.
• Chlorophyceae (Green Algae) : Contain chlorophyll a and b, which gives them their characteristic green color.
• Phaeophyceae (Brown Algae) : Contain chlorophyll a, c, and fucoxanthin, which gives them a brownish color.
• Rhodophyceae (Red Algae) : Contain chlorophyll a, d, and phycobilins (phycocyanin and phycoerythrin), which give them their red color.
15. CASE STUDY : Identify the animals A and B shown above in the figure and answer the following questions :
(a) Which type of circulatory system is present in these animals?
Answer – Closed circulatory system
(b) Which are osmoregulatory and excretory organs present in these animals?
Answer – Nephridia
(c) What are the scientific names of animals A and B?
Answer : Animal A → Nereis
Animal B → Hirudinaria
(d) Which one of the animals is monoecious & which one is dioecious?
Answer : Monoecious → Animal B
Dioecious → Animal A
16. Explain with suitable examples different types of phyllotaxy.
Answer – The arrangement of leaves on the stem of a plant is called phyllotaxy.
Types of Phyllotaxy :
• Opposite Phyllotaxy – In this type of arrangement, a pair of leaves opposite to each other develops at each node of the stem. Example: Guava
• Alternate Phyllotaxy – In this type of arrangement, only one single leaf develops at each node of the stem alternatively. Example: Rose
• Whorled Phyllotaxy – In this type of arrangement, more than two leaves develop at each node of the stem to form a whorl of leaves. Example: Sunflower
17. Differentiate between Chordates and Non-chordates.
Answer –
| Chordates | Non-chordates |
| 1. A notochord is present at some stage in the life of a chordate. | 1. Notochord is not present at any stage in the life of a non-chordate. |
| 2. Central nervous system is dorsal and hollow. | 2. Central nervous system is ventral and solid. |
| 3. Gill slits are present in the pharynx either in the embryo or adult. | 3. Gill slits are absent. |
| 4. Tail is present at some stage in the life of the chordate. | 4. Tail is absent. |
| 5. Heart is ventral. | 5. Heart is dorsal (if present). |
| 6. Pharyngeal gill-slits are present in them. | 6. Pharyngeal gill slits are absent in them. |