Plant tissues + animal tissues, location and function MCQs

Q1. Which of the following statements about phloem is correct?

• A.It transports food from leaves to other parts and contains sieve tubes, companion cells, phloem parenchyma and phloem fibres
• B.It transports food only downward and is composed entirely of dead cells
• C.It transports water and minerals from roots upward
• D.It is composed only of tracheids and vessels

Answer: A. It transports food from leaves to other parts and contains sieve tubes, companion cells, phloem parenchyma and phloem fibres

What is the textbook's take? Phloem conducts prepared food from leaves to other plant parts in both directions and is composed of sieve tubes, companion cells, phloem parenchyma and phloem fibres - mostly living cells. Water-and-mineral transport is by xylem, and tracheids/vessels are xylem elements. Only option (a) is correct. Pick: A) It transports food from leaves to other parts and contains sieve tubes, companion cells, phloem parenchyma and phloem fibres.

Q2. Which of the following is the principal cell type of areolar tissue?

• A.Fibroblasts and macrophages
• B.Osteocytes only
• C.Chondrocytes only
• D.Multinucleate striated fibres

Answer: A. Fibroblasts and macrophages

To see why, recall that Areolar tissue is a loose connective tissue containing fibroblasts (which secrete collagen and elastic fibres) and macrophages (which engulf debris), embedded in a soft matrix. Osteocytes belong to bone, chondrocytes to cartilage, and multinucleate striated fibres to skeletal muscle. Hence the correct cells are fibroblasts and macrophages. Hence the answer is A) Fibroblasts and macrophages.

Q3. Which is the correct sequence of events in the formation of permanent tissue from meristems?

• A.Cells divide → newly formed cells expand → cells differentiate and lose ability to divide
• B.Cells differentiate → cells expand → cells start dividing actively
• C.Cells expand → cells divide → cells become meristematic
• D.Cells differentiate → cells stop expanding → cells become meristematic

Answer: A. Cells divide → newly formed cells expand → cells differentiate and lose ability to divide

NCERT fact (biology, chapter 'Tissues'): Permanent tissues arise when meristematic cells first divide, then the newly formed cells expand and finally differentiate into specific cell types, losing the ability to divide in the process. The other options reverse or distort this developmental sequence. Final answer - A) Cells divide → newly formed cells expand → cells differentiate and lose ability to divide.