BIOLOGY REVISION- CLASS 7

1. The process by which green plants prepare their own food in the presence of sunlight is called ___________________

• chemosynthesis

• photosynthesis

• symbiosis

2. All green plants are called___________________

• heterotrophs

• symbionts

• autotrophs

3. The ___________ help in the opening and closing of the stomata.

• Guard cells

• cell wall

• nucleus

4. The digestive tract and the associated glands together constitute the _______________________ system .

• respiratory system

• digestive system

• circulatory system

5. The continuous canal which begins at the buccal cavity and ends at the anus is called __________

• Alimentary canal

• oesophagus

• food pipe

6. The largest gland of the human body is __________ which secretes ______________

• Liver, Bile

• Pancreas, Pancreatic Juices

• Liver, Trypsin

7.The finger like projections present on the inner walls of the small intestine are called as ______________.

• Villi

• mucus

• Rectum

8. Starch is broken down into sugars by the action of ___________

• Hydrochloric acid

• Salivary amylase

• Pepsin

9. Plants need __________ for photosynthesis

• carbon di oxide

• oxygen

• nitrogen

10. Tooth decay/ Plaque is formed because of__________

• Sweet food

• Acid released by sugars

• Spicy food