1. _______ consist of enzymes, which help in digestion.   Lysosomes   Centrosomes   Ribosomes   Plastids   Hint Half-n-half Clue   2. The lowest level of organization is the _______.   cell   tissue   organism   organ   Half-n-half Clue   3. A group of cells performing a specific function constitute a tissue.   True   False   4. The outermost covering of the plant cell is known as the cell membrane.   True   False   5. Which of the following cell organelles is found in the plant cell but not in the animal cell?   Mitochondrion   Ribosome   Chloroplast   Endoplasmic Reticulum   Half-n-half Clue   6. The green color of leaves is due to the presence of the _______ pigment.   xanthophyll   carotene   anthocyanin   chlorophyll   Half-n-half Clue   7. The network of convoluted tubules is called the _______.   mitochondrion   golgi apparatus   endoplasmic reticulum   microtubule   Half-n-half Clue