SS1 Third Term examination on Biology 2025

Welcome to your SS1 Third Term examination on Biology 2025

Name

Class

1. Which process is the primary way energy enters an ecosystem

B. Photosynthesis

D nutrient cycling

C decomposition

A. Respiration

2. Which of the following is a characteristic of autotrophs

D. They rely on external sources for nutrition

A. They obtain energy by consuming other organisms

B. They produce their own food

C. They are also known as consumers

3. Which process do most autotrophs use to make their food

D. Fermentation

C. Digestion

A cellular respiration

B photosynthesis

4. What is another name for heterotrophs

D autotrophs

B. Consumer

C. Decomposers

A. Producer

5. Which of the following is an example of heterotrophs

D bacterium that makes it's own food

B mushrooms

C algae

A tree

6. How do heterotrophs obtain the energy they need

A by absorbing sunlight

D by producing their own food

C by converting inorganic compounds into energy

B by consuming other organisms

7. Which of the following is an example of a photoautotrophs

D bacterium that uses chemical for energy

B mushroom

A cow

C green plants

8. What is the main difference between autotrophs and heterotrophs

D autotrophs live in water while heterotrophs live on land

C autotrophs reproduce while heterotrophs cannot

A autotrophs can move while heterotrophs cannot

B autotrophs make their own food and heterotrophs consume other organisms

9. What is a chemoautotroph?

D an organism that does not need Entergy

C An organism that obtain energy from oxidizing inorganic substances

B. An organism that obtain energy from consuming other organisms

A an organism that obtain energy from sunlight

10. Which of the following is a characteristic of both autotrophs and heterotrophs

B they both obtain energy from external source

C they both require energy for survival

D they both live in the same type of environment

A they both produce their own food

11. The diseases causing microorganisms among these is ___

A pathogens

D protozoa

C archaea

B bacteria

12. The diseases related with apple is known as

D fire blight

A red rust disease

C green ear disease

B Tikka diseases

13. Which of the following is a bacteria disease that affect the plants

D blister

C smut

A crown gall

B mosaic

14. Red rot is a disease of the following crop

D chick pea

B paddy

A sugar cane

C wheat

15. Which of the following is a direct consequence of deforestation for agricultural expansion

D improved water quality

A increased soil fertility

C loss of habitat and biodiversity

B enhanced biodiversity

16. Excessive use of chemical fertilizers in agriculture can lead to

B water pollution

C improved soil structure

D reduced green house gas emissions

A increased soil fertility

17. Monoculture farming practices can___

C make ecosystem more resilient to pests

D increase the risk of pests outbreak

A increase overall biodiversity

B enhance soil fertility

18. Which of the following is an example of an agricultural practice that can improve soil health

A continuous cropping

C crop rotation

B monoculture

D bush burning

19. What does a pH meter measure

A soil moisture

B light intensity

D wind speed

C acidity and alkalinity of a substance

20. What is the main aim of ecology?

C to analyze the chemical compound of the Earth's atmosphere

B to understand the distribution and abundance of organisms and their interaction with the environment

A to study the formation of rocks

D to explore the depth of the ocean

Subjectives

1. ____ is termed as a complex feeding relationships

2. The major difference between food chain and food web is _____

3 what is the role of sun in a food web?

4. What are decomposers?

5. The repeated cultivation of the same crop on the same land is known as ____

6. The process of burning vegetation to clear land for agricultural practice is called ___

7. The use of chemical, pesticides and fertilizers can lead to ____ in water bodies

8. ____ involves planting different crops in a sequence on the same land to improve soil health and reduce pest problems

9. Mention one abiotic factor

10. Mention one biotic factor

Theory; Answer all questions

1a. Discuss the life circle of tapeworm and round worm (1b) list three animals affected by each of the following diseases (I) anthrax (ii) Brucellosis (iii) tuberculosis

2a) describe the energy flow in an ecosystem (2b) using illustrations, explain the food chain and food web (2c) list and explain five factors that affect population

3a) draw and label ten measuring instruments and state their uses (3b)state three effects of each of the following on agricultural practices; (I) bush burning (ii) fertilizers (iii) tillage practices (4c) How do we improve crop yields?

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