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G e n e r a l 	 i n s t r u c t i o n s
T h i s 	 q u e s t i o n 	 p a p e r 	 h a s 	 7 	 q u e s t i o n s .
A l l 	 t h e 	 q u e s t i o n s 	 a r e 	 c o m p u l s o r y .
W r i t e 	 a n s w e r s 	 n e a t l y 	 a n d 	 l e g i b l y .
D r a w 	 d i a g r a m s 	 w h e r e v e r 	 n e c e s s a r y .
1 . 	 C h o o s e 	 t h e 	 c o r r e c t 	 a n s w e r 	 t o 	 t h e 	 f o l l o w i n g : 	 ( 4 )
a . 	 T h e 	 v a l e n c y 	 o f 	 t h e 	 u n d e r l i n e d 	 g r o u p 	 i n 	 N a 2 C O
3
	 i s 	 _ _ _ _ _ _ _ _ .
i . 	 1 	 i i . 	 2 	 i i i . 	 3 	 i v . 	 4
b . 	 T h e 	 i n s e c t i v o r o u s 	 p l a n t 	 i n 	 t h e 	 f o l l o w i n g 	 i s 	 _ _ _ _ _ _ _ _ .
i . 	 C u s c u t a 	 i i . 	 V e n u s 	 f l y t r a p 	 i i i . 	 M i s t l e t o e 	 i v . 	 L i c h e n s
c . 	 P l a n t s 	 m a n u f a c t u r e 	 f o o d 	 i n 	 t h e 	 f o r m 	 o f 	 _ _ _ _ _ _ _ .
i . 	 s t a r c h 	 i i . 	 f r u c t o s e 	 i i i . 	 g l u c o s e 	 i v . 	 s u c r o s e
d . 	 T h e 	 a t o m i c i t y 	 o f 	 a n 	 e l e m e n t 	 w i t h 	 c h e m i c a l 	 f o r m u l a 	 X
8
	 w i l l 	 b e 	 _ _ _ _ _ _ _ .
i . 	 2 	 i i . 	 3 	 i i i . 	 6 	 i v . 	 8
A n s . 	 	 a . 	 2 	 b . 	 V e n u s 	 f l y t r a p 	 c . 	 g l u c o s e 	 d . 	 8
2 . 	 W h a t 	 a r e 	 s a p r o p h y t e s ? 	 N a m e 	 a n y 	 t w o 	 s a p r o p h y t e s . 	 ( 2 )
A n s . 	 T h e 	 m o d e 	 o f 	 n u t r i t i o n 	 i n 	 w h i c h 	 o r g a n i s m s 	 l i v e 	 o n 	 d e a d 	 a n d 	 d e c a y i n g 	 m a t t e r 	 ( p l a n t s 	 a n d
a n i m a l s ) 	 t o 	 d e r i v e 	 t h e i r 	 f o o d 	 f r o m 	 t h e m 	 i s 	 k n o w n 	 a s 	 s a p r o t r o p h i c 	 n u t r i t i o n . 	 E x a m p l e :
m u s h r o o m , 	 s o m e 	 b a c t e r i a
3 . 	 D i f f e r e n t i a t e 	 b e t w e e n 	 a n 	 a t o m 	 a n d 	 a 	 m o l e c u l e . 	 ( 2 )
A n s . 	 A n 	 a t o m 	 i s 	 t h e 	 s m a l l e s t 	 p a r t i c l e 	 o f 	 a n 	 e l e m e n t 	 t h a t 	 c a n 	 t a k e 	 p a r t 	 i n 	 a 	 c h e m i c a l 	 r e a c t i o n .
I t 	 m a y 	 o r 	 m a y 	 n o t 	 e x i s t 	 i n d e p e n d e n t l y .
A 	 m o l e c u l e 	 i s 	 t h e 	 s m a l l e s t 	 p a r t i c l e 	 o f 	 a n 	 e l e m e n t 	 t h a t 	 c a n 	 n o r m a l l y 	 e x i s t 	 i n d e p e n d e n t l y .
Page 2


G e n e r a l 	 i n s t r u c t i o n s
T h i s 	 q u e s t i o n 	 p a p e r 	 h a s 	 7 	 q u e s t i o n s .
A l l 	 t h e 	 q u e s t i o n s 	 a r e 	 c o m p u l s o r y .
W r i t e 	 a n s w e r s 	 n e a t l y 	 a n d 	 l e g i b l y .
D r a w 	 d i a g r a m s 	 w h e r e v e r 	 n e c e s s a r y .
1 . 	 C h o o s e 	 t h e 	 c o r r e c t 	 a n s w e r 	 t o 	 t h e 	 f o l l o w i n g : 	 ( 4 )
a . 	 T h e 	 v a l e n c y 	 o f 	 t h e 	 u n d e r l i n e d 	 g r o u p 	 i n 	 N a 2 C O
3
	 i s 	 _ _ _ _ _ _ _ _ .
i . 	 1 	 i i . 	 2 	 i i i . 	 3 	 i v . 	 4
b . 	 T h e 	 i n s e c t i v o r o u s 	 p l a n t 	 i n 	 t h e 	 f o l l o w i n g 	 i s 	 _ _ _ _ _ _ _ _ .
i . 	 C u s c u t a 	 i i . 	 V e n u s 	 f l y t r a p 	 i i i . 	 M i s t l e t o e 	 i v . 	 L i c h e n s
c . 	 P l a n t s 	 m a n u f a c t u r e 	 f o o d 	 i n 	 t h e 	 f o r m 	 o f 	 _ _ _ _ _ _ _ .
i . 	 s t a r c h 	 i i . 	 f r u c t o s e 	 i i i . 	 g l u c o s e 	 i v . 	 s u c r o s e
d . 	 T h e 	 a t o m i c i t y 	 o f 	 a n 	 e l e m e n t 	 w i t h 	 c h e m i c a l 	 f o r m u l a 	 X
8
	 w i l l 	 b e 	 _ _ _ _ _ _ _ .
i . 	 2 	 i i . 	 3 	 i i i . 	 6 	 i v . 	 8
A n s . 	 	 a . 	 2 	 b . 	 V e n u s 	 f l y t r a p 	 c . 	 g l u c o s e 	 d . 	 8
2 . 	 W h a t 	 a r e 	 s a p r o p h y t e s ? 	 N a m e 	 a n y 	 t w o 	 s a p r o p h y t e s . 	 ( 2 )
A n s . 	 T h e 	 m o d e 	 o f 	 n u t r i t i o n 	 i n 	 w h i c h 	 o r g a n i s m s 	 l i v e 	 o n 	 d e a d 	 a n d 	 d e c a y i n g 	 m a t t e r 	 ( p l a n t s 	 a n d
a n i m a l s ) 	 t o 	 d e r i v e 	 t h e i r 	 f o o d 	 f r o m 	 t h e m 	 i s 	 k n o w n 	 a s 	 s a p r o t r o p h i c 	 n u t r i t i o n . 	 E x a m p l e :
m u s h r o o m , 	 s o m e 	 b a c t e r i a
3 . 	 D i f f e r e n t i a t e 	 b e t w e e n 	 a n 	 a t o m 	 a n d 	 a 	 m o l e c u l e . 	 ( 2 )
A n s . 	 A n 	 a t o m 	 i s 	 t h e 	 s m a l l e s t 	 p a r t i c l e 	 o f 	 a n 	 e l e m e n t 	 t h a t 	 c a n 	 t a k e 	 p a r t 	 i n 	 a 	 c h e m i c a l 	 r e a c t i o n .
I t 	 m a y 	 o r 	 m a y 	 n o t 	 e x i s t 	 i n d e p e n d e n t l y .
A 	 m o l e c u l e 	 i s 	 t h e 	 s m a l l e s t 	 p a r t i c l e 	 o f 	 a n 	 e l e m e n t 	 t h a t 	 c a n 	 n o r m a l l y 	 e x i s t 	 i n d e p e n d e n t l y .
4 . 	 a . 	 W r i t e 	 t h e 	 s y m b o l 	 f o r 	 S o d i u m . 	 ( 2 )
b . 	 W r i t e 	 t h e 	 f o r m u l a 	 f o r 	 H y d r o c h l o r i c 	 a c i d .
A n s . 	 	 a . 	 S y m b o l : 	 N a 	 b . 	 F o r m u l a : 	 H C l
5 . 	 C e r t a i n 	 f u n g i 	 l i v e 	 i n 	 t h e 	 r o o t s 	 o f 	 p l a n t s 	 l i k e 	 p i n e 	 a n d 	 o a k . 	 T h e 	 p l a n t 	 p r o v i d e s
n u t r i e n t s 	 a n d 	 f u n g i 	 i n 	 r e t u r n 	 h e l p 	 t h e 	 p l a n t 	 t a k e 	 u p 	 w a t e r 	 a n d 	 m i n e r a l s 	 f r o m 	 t h e 	 s o i l .
S u c h 	 r e l a t i o n s h i p 	 i s 	 c a l l e d 	 s y m b i o s i s . 	 ( 3 )
a . 	 W h a t 	 t w o 	 v a l u e s 	 a r e 	 d e p i c t e d 	 b y 	 t h i s 	 t y p e 	 o f 	 a s s o c i a t i o n ?
b . 	 G i v e 	 t w o 	 m o r e 	 e x a m p l e s 	 o f 	 l i v i n g 	 o r g a n i s m s 	 w h i c h 	 s h a r e 	 s u c h 	 t y p e 	 o f 	 a s s o c i a t i o n .
A n s . 	 a . 	 H e l p i n g 	 e a c h 	 o t h e r 	 i n 	 n e e d , 	 l i v i n g 	 i n 	 h a r m o n y 	 w i t h 	 e a c h 	 o t h e r .
b . 	 R h i z o b i u m 	 b a c t e r i a 	 l i v e s 	 i n 	 t h e 	 r o o t 	 n o d u l e s 	 o f 	 l e g u m i n o u s 	 p l a n t s . 	 A n 	 a l g a e 	 a n d 	 a 	 f u n g u s
l i v e s 	 t o g e t h e r 	 a n d 	 f o r m 	 l i c h e n s .
6 . 	 W h a t 	 a r e 	 t h e 	 f a c t o r s 	 e s s e n t i a l 	 f o r 	 p h o t o s y n t h e s i s 	 t o 	 t a k e 	 p l a c e ? 	 S u p p o r t 	 y o u r 	 a n s w e r
w i t h 	 a 	 l a b e l l e d 	 d i a g r a m 	 a n d 	 t h e 	 c h e m i c a l 	 e q u a t i o n . 	 ( 3 )
A n s . 	 W a t e r , 	 c a r b o n 	 d i o x i d e , 	 c h l o r o p h y l l 	 a n d 	 s u n l i g h t 	 a r e 	 e s s e n t i a l 	 f o r 	 p h o t o s y n t h e s i s 	 t o 	 t a k e
p l a c e . 	 I n 	 p h o t o s y n t h e s i s , 	 c a r b o n 	 d i o x i d e 	 a n d 	 w a t e r 	 c o m b i n e 	 i n 	 t h e 	 p r e s e n c e 	 o f 	 c h l o r o p h y l l
a n d 	 s u n l i g h t 	 t o 	 f o r m 	 g l u c o s e 	 a n d 	 o x y g e n . 	 S t u d e n t s 	 w i l l 	 d r a w 	 t h e 	 d i a g r a m .
6 C O
2
	 + 	 1 2 H
2
O 	 ? 	 C
6
H
1 2
O
6
	 + 	 6 O
2
	 + 	 6 H
2
O
7 . 	 a . 	 W h a t 	 i s 	 a 	 c h e m i c a l 	 e q u a t i o n ? 	 W h y 	 i s 	 i t 	 n e c e s s a r y 	 t o 	 b a l a n c e 	 t h e 	 e q u a t i o n ? 	 ( 4 )
b . 	 B a l a n c e 	 t h e 	 g i v e n 	 e q u a t i o n
	 C a C O
3
	 + 	 H C l 	 ? 	 C a C l
2
	 + 	 H
2
O 	 + 	 C O
2
A n s . 	 a . 	 A 	 c h e m i c a l 	 e q u a t i o n 	 s h o w s 	 t h e 	 r e s u l t 	 o f 	 a 	 c h e m i c a l 	 r e a c t i o n 	 i n 	 w h i c h 	 t h e 	 r e a c t a n t s
a n d 	 t h e 	 p r o d u c t s 	 a r e 	 r e p r e s e n t e d 	 b y 	 s y m b o l s 	 o r 	 f o r m u l a . 	 I t 	 i s 	 n e c e s s a r y 	 t o 	 b a l a n c e 	 t o 	 h a v e
s a m e 	 n o . 	 o f 	 a t o m s 	 i n 	 l e f t 	 a n d 	 r i g h t 	 s i d e 	 o f 	 t h e 	 r e a c t i o n .
b . 	 C a C O
3
	 + 	 2 H C l 	 ? 	 C a C l
2
	 + 	 H
2
O 	 + 	 C O
2
	 B a l a n c e d 	 e q u a t i o n
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FAQs on Class 7 Science: CBSE Past Year Paper - 7 - Science Class 7

1. What is the importance of studying past year papers for CBSE Class 7 Science?
Ans. Studying past year papers for CBSE Class 7 Science is important because it helps students understand the exam pattern, marking scheme, and the types of questions that can be asked. It allows students to familiarize themselves with the format of the exam and identify important topics that are frequently covered. By solving past year papers, students can also assess their level of preparation and identify areas where they need to focus more.
2. How can solving past year papers help in improving exam performance?
Ans. Solving past year papers can help in improving exam performance by providing students with a clear understanding of the question pattern and the level of difficulty. By practicing with these papers, students become more comfortable with the exam format and can manage their time effectively during the actual exam. Additionally, solving past year papers helps in identifying weak areas, improving time management skills, and boosting confidence.
3. Are the questions in the past year papers exactly the same as the ones in the actual CBSE Class 7 Science exam?
Ans. While the questions in the past year papers may not be exactly the same as the ones in the actual CBSE Class 7 Science exam, they are designed to be similar in terms of difficulty level and concepts covered. The purpose of the past year papers is to give students an idea of the types of questions that can be asked and to help them practice and prepare accordingly. Therefore, studying past year papers is still beneficial for exam preparation.
4. How should one approach solving past year papers for CBSE Class 7 Science?
Ans. To approach solving past year papers for CBSE Class 7 Science, it is recommended to allocate a specific time for each paper and solve it under exam-like conditions. Start by reading the questions carefully and understanding the concepts required to answer them. Attempt the questions in a systematic manner, keeping track of time to ensure completion within the given duration. After solving the paper, evaluate the answers and identify areas for improvement.
5. Can solving only past year papers be enough for scoring well in the CBSE Class 7 Science exam?
Ans. While solving past year papers is an important part of exam preparation, it should not be the sole focus. Students should also thoroughly study the textbook, understand the concepts, and practice additional sample papers and worksheets. Solving past year papers helps in assessing one's preparation level and familiarizing oneself with the exam pattern, but a holistic approach to studying is necessary for scoring well in the CBSE Class 7 Science exam.
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