NCERT Class X Science Class: Chapter –6. Life Processer – Part-6

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Question 30:

Choose the forms in which most plants absorb nitrogen

(i) Proteins

(ii) Nitrates and Nitrites

(iii) Urea

(iv) Atmospheric nitrogen

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i) and (iv)

Answer: B

Image the plants absorb nitrogen

Image the Plants Absorb Nitrogen

Image the plants absorb nitrogen

Question 31:

Which is the first enzyme to mix with food in the digestive tract?

(a) Pepsin

(b) Cellulose

(c) Amylase

(d) Trypsin

Answer: C

Image the digestive enzymes

Image the Digestive Enzymes

Image the digestive enzymes

Question 32:

Which of the following statement(s) is (are) correct?

(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast

(ii) Fermentation takes place in aerobic bacteria

(iii) Fermentation takes place in mitochondria

(iv) Fermentation is a form of anaerobic respiration

(a) (i) and (iii)

(b) (ii) and (iv)

(c) (i) and (iv)

(d) (ii) and (iii)

Answer: C

Image the glycolysis and fermentation

Image the Glycolysis and Fermentation

Image the glycolysis and fermentation

Question 33:

Lack of oxygen in muscles often leads to cramps among cricketers. This results due to

(a) Conversion of pyruvate to ethanol

(b) Conversion of pyruvate to glucose

(c) Non conversion of glucose to pyruvate

(d) Conversion of pyruvate to lactic acid

Answer: D

Image Lack of oxygen in muscles

Image Lack of Oxygen in Muscles

Image Lack of oxygen in muscles

Question 34:

Choose the correct path of urine in our body

(a) Kidney → ureter → urethra → urinary bladder

(b) Kidney → urinary bladder → urethra → ureter

(c) Kidney → ureters → urinary bladder → urethra

(d) Urinary bladder → kidney → ureter → urethra

Answer: C

Image pathway of urine

Image Pathway of Urine

Image pathway of urine

Question 35:

During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the

(a) Cytoplasm

(b) Chloroplast

(c) Mitochondria

(d) Golgi body

Answer: A

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